Ellen Howell

KMap

❝

Dr. Ellen Howell received a Ph.D. from LPL in December, 1995. She moved to Puerto Rico and worked as a post-doc in the Geology Department of the University of Puerto Rico, Mayagüez. She then spent 14 years at the Arecibo Observatory as a staff scientist. Ellen specializes in remote sensing of asteroids and comets, and combining different types of data at different wavelengths. She studies thermal properties of near-Earth asteroids, radar imaging, and compositional spectroscopy. She also studies the coma of comets at radio wavelengths, for which the Arecibo Observatory is especially well suited. Since returning to Tucson in August, she has been working on the OSIRIS-REx mission to Bennu, in the spectral analysis and imaging processing groups.

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Grants

Analysis of Low-Albedo Asteroids Observed through JWST Guaranteed Time
Principal Investigator (PI)
2022
$20.1K
Active
Deep Studies of NEAs: Bridging the Gap Between Surveys and Spacecraft
Principal Investigator (PI)
2021
$140.9K
Active
Arecibo Observatory Planetary Radar Program
Co-Investigator (COI)
2019
$908.4K
Active
Near-Earth Asteroid Surfaces Are Not Uniform: Using Thermal Models of Multiple Observations to Reveal Inhomogeneities
Principal Investigator (PI)
2019
$642.0K
Active
In the Eye of the Storm: Inner Coma Remote Sensing of Three Jupiter Family Comets
Co-Investigator (COI)
2016
$490.9K
Active
Inner Coma Grain Environments of Jupiter Family Comets
Co-Investigator (COI)
2020
$90.0K
Collaboration with Arecibo Observatory on Observations of Comets and Asteroids
Co-Investigator (COI)
2016
$229.2K
Water and OH on Primitive Bodies: Expanding the Frontier
Principal Investigator (PI)
2016
$59.1K
Volatiles, Regolith and Thermal Investigations Consortium for Exploration and Science
Principal Investigator (PI)
2015
$141.5K

Investigation of Near-Earth Asteroid Properties Through a Combination of Infrared and Radar Observations
Principal Investigator (PI)
2015
$35.0K

News

UA Researcher Captures Rare Radar Images of Comet 46P/Wirtanen
2018

UA-Led OSIRIS-REx Discovers Water on Asteroid Bennu
2018

Publications (394)

Recent

Radial Distribution of the Dust Comae of Comets 45P/Honda-Mrkos-Pajdus??\'akov\'a and 46P/Wirtanen
2022
Constraining the Spectral Homogeneity of Near-Earth Asteroids
2022
Arecibo Planetary Radar Observations of Near-Earth Asteroids: December 2017 \textendash December 2019
2022
Mid-Infrared Thermophysical Models of Near-Earth Asteroid 2100 Ra-Shalom
2022
Comparison of NEATM-like Models with NASA IRTF and NEOWISE Observations of Near-Earth Asteroid (285263) 1998 QE2
2022
Exogenic basalt on asteroid (101955) Bennu
2021
Constraints on the Water-Production Rates of Interstellar Comet 2I/Borisov from Arecibo Radio OH Observations
2021
Distinct Populations of Low-Albedo Asteroids Based on Their Hydrated Mineral Compositions
2021
Hydrated Minerals on B-class Asteroids
2021
Thermophysical Modeling of Near-Earth Asteroid 2100 Ra-Shalom Using a Revised Shape Model
2021
VizieR Online Data Catalog: Contact-binary (68346) 2001 KZ66 light curves (Zegmott+, 2021)
2021
Radar Observations of Near-Earth Asteroid 2019 OK
2021
Comparisons of NEATM-like Models for NEAs with NASA IRTF and NEOWISE Data
2021
Constraining the Orbital Parameters of the Didymos-Dimorphos System: Lightcurve Observations in Preparation for AIDA/DART
2021
Near-Earth Object Characterization Using Ground-Based Radar Systems
2021
Thermophysical modeling of (3200) Phaethon using a radar/lightcurve shape and constrained by infrared observations with SpeX at the NASA/IRTF
2021
Thermophysical properties of (433) Eros from multi-wavelength observations
2021
Hydrogen abundance estimation and distribution on (101955) Bennu
2021
Constraining the Orbital Parameters of the Didymos-Dimorphos System: Photometric Observations in Support of DART
2021
The importance of ground-based radar observations for planetary exploration
2021
Detection of the YORP effect on the contact binary (68346) 2001 KZ66 from combined radar and optical observations
2021
Near-Earth Objects
2021
A repeating CN jet feature from 45P/Honda-Mrkos-Pajdu\v{s}\'akov\'a
2020
Neutron Star Extreme Matter Observatory: A kilohertz-band gravitational-wave detector in the global network
2020
The L-band Main-belt and NEO Observations Program (LMNOP): X-complex and Small C-complex Objects
2020
Hydration variations of Bennu's surface: comparison of different methods.
2020
The Zadko telescope results: ten years of science
2020
The Rotationally-resolved Thermophysical Properties of (433) Eros from Ground-Based Observations
2020
Spin-driven evolution of asteroids' top-shapes at fast and slow spins seen from (101955) Bennu and (162173) Ryugu
2020
Estimated Hydration of Bennu's Surface from OVIRS Observations by OSIRIS-REx Mission
2020
Variations in color and reflectance on the surface of asteroid (101955) Bennu
2020
Thermophysical properties of Bennu and the OSIRIS-REx sample sites
2020
Main-Belt Infrared Spectral Analogues for (101955) Bennu: Gaussian Fitting to AKARI Spectra of Bennu-Like Asteroids
2020
VizieR Online Data Catalog: SpT \ NIR color excess of Solar-type stars (Lewin+, 2020)
2020
Photometry of Particles Ejected From Active Asteroid (101955) Bennu
2020
Observing Interstellar Comet 2I/Borisov for Radio OH Lines with the Arecibo Observatory
2020
VNIR and TIR Spectral Characteristics of (101955) Bennu from OSIRIS-REx Detailed Survey and Reconnaissance A Observations
2020
Visible-near infrared spectral indices for mapping mineralogy and chemistry with OSIRIS-REx
2020
Near-infrared observations of active asteroid (3200) Phaethon reveal no evidence for hydration
2020
Modeling Thermophysical Properties of 2100 Ra-Shalom
2020
Geology of Bennu's Equatorial Region
2020
OSIRIS-REx spectral analysis of (101955) Bennu by multivariate statistics
2020
Near-Earth Asteroid CW Radar Observations at Arecibo Observatory 1998-2016
2020
Near-infrared Spectral Characterization of Solar-type Stars in the Northern Hemisphere
2020
Global Minor Spectral Features on (101995) Bennu from the OSIRIS-REx Visible and InfraRed Spectrometer (OVIRS)
2020
Mapping Spectral Units on (101955) Bennu
2019
Main-Belt Infrared Spectral Analogues for (101955) Bennu: AKARI and Spitzer IRS Asteroid Spectra
2019
Thermally driven fracture processes on asteroid Bennu: Relating simulations to observations
2019
Search for Iron Oxide and Iron Sulfide on Asteroid (101955) Bennu from Osiris-Rex Visible and Infra-Red Spectrometer Preliminary Survey Data
2019
Are the brighter rocks on Bennu products of recent mechanical weathering, and therefore less space-weathered?
2019
Comparing the RADAR Shape Model of (101955) Bennu with Ground Truth from OSIRIS-REx
2019
VizieR Online Data Catalog: PHA contact-binary (85990) 1999 JV6 light curves (Rozek+, 2019)
2019
The unexpected surface of asteroid (101955) Bennu
2019
Decimeter-scale particle characterization in the coma of 73P/Schwassmann-Wachmann 3 using dual-wavelength radar observations
2019
Physical Interpretation of Bennu's Thermal Inertia
2019
Shape model and spin-state analysis of PHA contact binary (85990) 1999 JV6 from combined radar and optical observations
2019
Mineral and Chemical Map Production for the OSIRIS-REx Mission
2019
Radial Dust Profiles of Three Close Approach Jupiter Family Comets
2019
Evidence for widespread hydrated minerals on asteroid (101955) Bennu
2019
Disk-Integrated Hydrated Mineral Features on (101955) Bennu with OVIRS
2019
Surface Temperatures of (101955) Bennu Observed by OSIRIS-REx
2019
Thermophysical Properties of (101955) Bennu from OSIRIS-REx Observations
2019
Detection of Rotational Acceleration of Bennu Using HST Light Curve Observations
2019
Infrared Spectroscopy of Large, Low-Albedo Asteroids: Are Ceres and Themis Archetypes or Outliers?
2019
GBT Planetary Radar System
2019
VNIR and TIR Spectral Characteristics of (101955) Bennu from OSIRIS-REx Approach and Preliminary Survey Observations
2019
Phase Reddening and Bolometric Bond Albedo Variations in Global Photometry of (101955) Bennu with OVIRS
2019
Corrigendum to ``Radar observations and the shape of near-Earth asteroid 2008 EV5'' [ICARUS 212 (2011) 649-660]
2019
The Rotationally-resolved surface properties of (433) Eros from thermophysical modeling
2019
Thermal Inertia Maps of (101955) Bennu from OSIRIS-REx Infrared Observations
2019
Spatial variations in hydrated band depth on (101955) Bennu, using OVIRS reflectance spectra
2019
The operational environment and rotational acceleration of asteroid (101955) Bennu from OSIRIS-REx observations
2019
First results of a spectral clustering analysis applied to OSIRIS-REx color imaging of asteroid (101955) Bennu
2019
Properties of rubble-pile asteroid (101955) Bennu from OSIRIS-REx imaging and thermal analysis
2019
Mapping spectral slopes across (101955) Bennu
2019
Bennu: An Aqueously Altered and Mildly Heated CM Carbonaceous Asteroid
2019
Decimeter-Scale Coma Particle Characterization of Comet 73P/Schwassmann-Wachmann 3 Using Dual-Wavelength Radar Observations
2018
SHERMAN - A shape-based thermophysical model II. Application to 8567 (1996 HW1)
2018
OSIRIS-REx Encounters Earth: Signatures of a Habitable World
2018
Modeling the large-grain ($\gt$2 cm) coma of comet 45P/Honda\ndashMrkos\ndashPajdu\v s\'akov\'a from Arecibo Observatory radar observations
2018
Evidence for OH or H$_2$O on the surface of 433 Eros and 1036 Ganymed
2018
Radar and Infrared Observations of Near-Earth Asteroid 3200 Phaethon
2018
Goldstone and Arecibo radar observations of (99942) Apophis in 2012-2013
2018
SHERMAN-Based Thermophysical Model of (101955) Bennu
2018
Arguments for NPA rotation of comet 41P/Tuttle-Giacobini-Kres\'ak
2018
A Revised Shape Model of Asteroid (216) Kleopatra
2018
Temporal Evolution of the Sunward Dust Feature of Comet 41P/Tuttle\ndashGiacobini\ndashKres\'ak
2018
Surface Properties of Space Flight Accessible Near-Earth Objects
2018
A Shape-based Thermophysical Model of (433) Eros
2018
3-\microm Spectroscopy of Asteroid (3200) Phaethon: Implications for B-Asteroids
2018
Arecibo and Goldstone Radar Images of Near-Earth Asteroid (469896) 2005 WC1
2018
Infrared Spectroscopy of Large, Low-Albedo Asteroids: Is Ceres an Archetype or Outlier?
2018
SHERMAN, a shape-based thermophysical model. I. Model description and validation
2018
Arecibo Radar Observation of Near-Earth Asteroids: Expanded Sample Size, Determination of Radar Albedos, and Measurements of Polarization Ratios
2017
Near-surface bulk densities of asteroids derived from dual-polarization radar observations
2017
Thermal Properties and an Improved Shape Model for Near-Earth Asteroid (162421) 2000 ET70
2017
Goldstone radar evidence for short-axis mode non-principal-axis rotation of near-Earth asteroid (214869) 2007 PA8
2017
Narrowband Optical Observations of the Near-Nucleus Region of Jupiter-Family Comets Comet 45P/Honda-Mrkos-Pajdu\v s\'akov\'a (HMP)
2017
OSIRIS-REx: Sample Return from Asteroid (101955) Bennu
2017
The Remote Observing Working Group for the Asteroid Impact and Deflection Assessment (AIDA)
2017
Radar, Optical, and Infrared Observations of Equal-Mass Binary Near-Earth Asteroid (190166) 2005 UP156
2017
The Hydrated Mineralogies of the Largest Asteroids
2017
The radial and azimuthal properties of volatiles and dust in the inner coma of Comet 45P/Honda-Mrkos-Pajdu\v s\'akov\'a
2017
Spectral Mapping at Asteroid 101955 Bennu
2017
Variation in Surficial Hydrated Minerals on Large Low-Albedo Asteroids
2017
Radar Observations and Shape Model of Asteroid 16 Psyche
2017
Particle Sizes in the Coma of Comet 45P/Honda-Mrkos-Pajdu\v s\'akov\'a from Arecibo Radar Observations
2017
The sunward continuum feature of Comet 45P/Honda-Mrkos-Pajdu\v s\'akov\'a
2017
Thermophysical Modeling of Potentially Hazardous Asteroid (85989) 1999 JD6
2017
Radio observations of comets 41P/Tuttle-Giacobini-Kres\'ak and 45P/Honda-Mrkos-Pajdu\v s\'akov\'a with the Green Bank Telescope
2017
Radar and Infrared Observations of Binary Near-Earth Asteroid 5143 Heracles
2017
Arecibo radar observations of 41P/Tuttle-Giacobini-Kresák constrain the nucleus size and rotation
2017
Radar and Lightcurve Shape Model of Near-Earth Asteroid (1627) Ivar
2017
Near-infrared thermal emission from near-Earth asteroids: Aspect-dependent variability
2017
Comet 45P/Honda-Mrkos-Pajdusakova
2017
RADAR OBSERVATIONS AND SHAPE MODEL OF ASTEROID 16 PSYCHE.
2016
Understanding the Importance of Shape in Thermal Modeling: The Case of 1627 Ivar
2016
Arecibo and Goldstone Radar Imaging of Near-Earth Asteroid 2005 WC1
2016
Thermophysical Modeling of NEAs Using SHERMAN: 1627 Ivar
2016
Radar Observations of Near-Earth Asteroids from Arecibo and Goldstone
2016
The L-Band Main-Belt and NEO Observing Program (LMNOP): Some Final Results from Phase 1
2016
The Arecibo Observatory Planetary Radar System
2016
Characterization of the high-albedo NEA 3691 Bede
2016
Population trends of binary near-Earth asteroids based on radar and lightcurves observations
2016
Thermal Properties and a Revised Shape Model for Near-Earth Asteroid (162421) 2000 ET70
2016
Asteroid 16 Psyche: Radar Observations and Shape Model
2016
2013 Apparition of Near-Earth Asteroid (52760) 1998 ML14: Radar and Optical Constraints on Shape and Spin State
2016
A radar survey of M- and X-class asteroids. III. Insights into their composition, hydration state, {\amp} structure
2015
Arecibo Observatory Space Academy: Inspiring the next Generation of Scientists from Puerto Rico
2015
NEAs: Phase Angle Dependence of Asteroid Class and Diameter from Observational Studies
2015
Improved Shape Model of 1627 Ivar
2015
Asteroids and Comets
2015
Radio OH spectroscopic mapping survey of 26 comets: Trends in outflow velocity and collisional quenching
2015
Radar Observations of Near-Earth Asteroid (52760) 1998 ML14: Constraints from the 1998 and 2013 Apparitions
2015
The Ch-class Asteroids: Connecting a Visible Taxonomic Class to a 3 {$\mu$}m Band Shape
2015
Physical modeling of triple near-Earth Asteroid (153591) 2001 SN263 from radar and optical light curve observations
2015
Radar imaging of binary near-Earth asteroid (357439) 2004 BL86
2015
Thermophysical Model of S-complex NEAs: 1627 Ivar
2015
Thermal Modeling of Three Non-Spherical Near-Earth Asteroids
2015
Astronomical Observations of Volatiles on Asteroids
2015
Potentially Hazardous Asteroid (85989) 1999 JD6: Radar, Infrared, and Lightcurve Observations and a Preliminary Shape Model
2015
Size estimate of (99942) Apophis based on radar imaging
2015
Physical Diversity of Near-Earth Asteroids from Arecibo Radar Observations
2015
The Shape of Near-Earth Asteroid 275677 (2000 RS11) From Inversion of Arecibo and Goldstone Radar Images
2015
SHERMAN: A Shape-based Thermophysical Model for Near-Earth Asteroids
2015
Spectral slope variations for OSIRIS-REx target Asteroid (101955) Bennu: Possible evidence for a fine-grained regolith equatorial ridge
2015
Triple near-Earth asteroid 2001 SN\_$\{$263$\}$: Physical models of the primary asteroid and its two satellites
2014
Radar characterization of asteroids and comets
2014
Radar images of Comet 209P/LINEAR: Constraints on shape and rotation
2014
Radar investigations of near-Earth asteroids at Arecibo and Goldstone
2014
The Smallest Binary Asteroid? The Discovery of Equal-Mass Binary 1994 CJ1
2014
Detection of aspect-dependent thermal emission as a signature of near-Earth asteroid pole orientation
2014
Recent Arecibo Radar Observations of Main-Belt Asteroids.
2014
Thermal Emission Photometry of Three Near-Earth Asteroids in L' and M'
2014
(2340) Hathor
2014
Comparing the diameters and visual albedos derived from radar and infrared observations
2014
Orbit and bulk density of the OSIRIS-REx target Asteroid (101955) Bennu
2014
Updated Shape Model of 1627 Ivar from 2013 Observations
2014
Near-Earth asteroid (137032) 1998 UO\_1: Shape model and thermal properties
2014
Circular-polarization ratio variation with rotation for 2006 AM\_4
2014
Radio OH Observations of Recent Bright Comets from Arecibo
2014
Detecting Earth's temporarily-captured natural satellites-Minimoons
2014
The LXD-mode Main-Belt/NEO Observing Program (LMNOP): Results
2014
Radio observations of comet C/2012 X1 LINEAR
2014
Detectability of Boulders on Near-Earth Asteroids
2014
Goldstone and Arecibo Radar Images of Near-Earth Asteroid 2014 HQ124
2014
Radar-Derived Shape Model of Near-Earth Binary Asteroid System (285263) 1998 QE2
2014
Radar evidence for diverse shapes of the primaries among binary near-Earth asteroids
2014
Shape-Based Thermal Modeling of Three Near-Earth Asteroids
2014
New lightcurve of asteroid (216) Kleopatra to evaluate the shape model
2014
Understanding near-Earth asteroids: Is it in the details?
2014
Shape model of the binary near-Earth asteroid (285263) 1998 QE\_2
2014
Arecibo and Goldstone radar evidence for boulders on near-Earth asteroids
2014
The Design Reference Asteroid for the OSIRIS-REx Mission Target (101955) Bennu
2014
Radar Shape Model of Binary Near-Earth Asteroid (285263) 1998 QE2
2014
Minimoon Discovery with Ground-based Radar Facilities
2013
Shape model and surface properties of the OSIRIS-REx target Asteroid (101955) Bennu from radar and lightcurve observations
2013
Radio OH observations of Comet C/2011 L4 PANSTARRS
2013
Using a Radar Shape Model to Interpret Spectral Observations of near-Earth Asteroid 4179 Toutatis
2013
A Lower Size Limit for Near-Earth Asteroid Satellites
2013
Are the Radar Scattering Properties of Near-Earth Asteroids Correlated with Size, Shape, or Spin?
2013
Application of a Shape-Based Thermophysical Model to Contact Binary Near-Earth Asteroids
2013
Physical Characterization of Binary Near-Earth Asteroid (153958) 2002 AM31
2013
Volatiles in the M-class Population: A Lesson from Vesta?
2013
Physical Characterization of Deep Impact Flyby Target (163249) 2002 GT
2013
Binary Near-Earth Asteroid (285263) 1998 QE2: Goldstone and Arecibo Radar Imaging and Lightcurve Observations
2013
Asteroid (101955) Bennu Shape Model V1.0
2013
Low temperature heat capacities of solar system materials
2013
The Ch asteroids: Connecting a Visible Taxonomic Class to a 3-{\micro}m spectral shape
2013
Radar Observations of Three X/M-Class Main-Belt Asteroids
2013
The measurement of meteorite heat capacity at low temperatures using liquid nitrogen vaporization
2013
The NEO (175706) 1996 FG3 in the 2-4 {$\mu$}m spectral region: Evidence for an aqueously altered surface
2013
Pre-Perihelion Radio Observations of Comet C/2009 P1 Garradd
2012
The Shape of OSIRIS-REx Mission Target 1999 RQ$_{36}$ from RADAR and Lightcurve Data
2012
The Trajectory Dynamics of Near-Earth Asteroid 101955 (1999 RQ36)
2012
Combining Thermal and Radar Observations of Near-Earth Asteroids
2012
The MarcoPolo-R target asteroid (175706) 1996 FG3: hydrated minerals and a variable spectral slope
2012
Binary Near-Earth Asteroid 2000 DP107, A Prime Spacecraft Target
2012
Radar Observations and Shape Modeling of Near-Earth Asteroid (162421) 2000 ET70
2012
Radar Observations of 2005 YU55's Flyby of Earth
2012
Shape Modeling of Near-Earth Asteroid (53319) 1999 JM8 from Goldstone and Arecibo Radar Images
2012
The Detectability of Earth{\rsquo}s Temporarily Captured Orbiters
2012
Arecibo and Goldstone Radar Observations of Binary Near-Earth Asteroid and Marco Polo-R Mission Target (175706) 1996 FG3
2012
Does the Solar Wind Create OH on NEO Surfaces?: Observations of 433 Eros and 1036 Ganymed
2012
The Shape of OSIRIS-REx Mission Target 1999 RQ36 from Radar and Lightcurve Data
2012
2004 FG11
2012
Radio Observations of Comet C/2009 P1 Garradd
2012
Toward a taxonomy of asteroid spectra in the 3-{$\mu$}m region
2012
New Observations and Proposed Meteorite Analogs of the MarcoPolo-R Target Asteroid (175706) 1996 FG3
2012
The Shape and Spin Distributions of Near-Earth Asteroids Observed with the Arecibo Radar System
2012
2007 LE
2012
Ice on Low Albedo Asteroids: More Widespread than Previously Thought?
2012
Radar Imaging Of 11066 Sigurd, 2000 YF29, And 2004 XL14 And The Obliquity Distribution Of Contact Binary Near-Earth Asteroids
2012
(5143) Heracles
2012
Shape and Spin of Near-Earth Asteroid 308635 (2005 YU55) from Radar Images and Speckle Tracking
2012
Examining the Shape Distribution of Near-Earth Asteroids
2012
Radar Observations of Seven X/M-Class Main-Belt Asteroids
2012
Dynamics of Binary Near-Earth Asteroid System (35107) 1991 VH
2012
Asteroid (101955) 1999 RQ36: Spectroscopy from 0.4 to 2.4 {$\mu$}m and meteorite analogs
2011
Asteroid 21 Lutetia at 3 {$\mu$}m: Observations with IRTF SpeX
2011
Binary Near-Earth Asteroid 2000 DP107: Component Shapes, Mutual Orbit, Evolution
2011
Radar observations and the shape of near-Earth ASTEROID 2008 EV5
2011
EPOXI: Comet 103P/Hartley 2 Observations from a Worldwide Campaign
2011
Comet 103P/Hartley: Radar Observations of the Nucleus and Large-Grain Coma
2011
Hydrated silicates on main-belt asteroids: Correlation of the 0.7- and 3 micron absorption bands
2011
Radar and photometric observations and shape modeling of contact binary near-Earth Asteroid (8567) 1996 HW1
2011
Radar and optical observations and physical modeling of triple near-Earth Asteroid (136617) 1994 CC
2011
Constraints on the Rotation State of Comet 103P/Hartley 2
2011
Observations of 21 Lutetia in the 2-4 {\micro}m Region with the NASA IRTF
2011
The cool surfaces of binary near-Earth asteroids
2011
Asteroid 21 Lutetia at 3-4m: Observations with IRTF SpeX
2011
Near-infrared spectroscopy of primitive asteroid families
2011
Thermophysical Modeling of Contact Binary Near-Earth Asteroid (8567) 1996 HW1
2011
(596) Scheila
2011
Radar Observations of Comet 103P/Hartley 2
2011
First Detection of Water Ice and Organics on an Asteroid: A Possible Link to the Origin of Earth's Water
2010
Asteroid (101955) 1999 RQ36: Spectroscopy from 0.4 to 2.5 microns and Meteorite Analogs
2010
Characterization of Near-Earth Asteroid 2009 KC3 from Radar and Thermal Infrared Observations
2010
Radar Images And Shape Model Of A Triple Asteroid (136617) 1994CC
2010
Radar Observations and the Shape of 2008 EV5: Ridges and Craters on Near-Earth Asteroids
2010
Comet 103P/Hartley
2010
Radar observations of 8P/Tuttle: A contact-binary comet
2010
Radar Observations of Asteroids 64 Angelina and 69 Hesperia
2010
Observations of NEAs at Arecibo Observatory and NASA's IRTF: Combining Radar and Thermal Measurements to Better Understand NEA Physical Properties
2010
Radar Shape Modeling of Binary Near-Earth Asteroid 2000 CO101
2010
Water ice and organics on the surface of the asteroid 24 Themis
2010
Radar Shape Modeling Of (8567) 1996 HW1 Combined With Thermal Observations
2010
A radar survey of M- and X-class asteroids II. Summary and synthesis
2010
The Icy Nature of Asteroid 24 Themis
2010
The Origin of the Solar System: Progress in Understanding Accretion from its End Products
2009
The Hayabusa Spacecraft Model of Itokawa: Lessons Learned for Radar Shape Models
2009
Arecibo and Goldstone Radar Images of Near-Earth Asteroid (136849) 1998 CS1
2009
(136617) 1994 CC
2009
Variability of Thermal Infrared Emission from Near-Earth Asteroids
2009
Radar Observations of Main-Belt M-class Asteroids
2009
Confirming Water Ice on the Surface of Asteroid 24 Themis
2009
2000 CO\_101
2009
The Case for Ceres: Report to the Planetary Science Decadal Survey Committee
2009
Arecibo OH Radio Mapping Observations of Comet C/2007 N3 Lulin
2009
Arecibo Radar Imaging of 2001 SN263: A Near-Earth Triple Asteroid System
2008
Comet 8P/Tuttle
2008
Comet C/2007 W1 (Boattini)
2008
2008 BT\_18
2008
Observations Of OH In Long-period Comet C/2007 W1 Boattini
2008
A radar survey of M- and X-class asteroids
2008
What do we learn from radar observations of asteroids and comets?
2008
What We Learn from Radar Shape Models
2008
Thermal Infrared Observations of Several Near-Earth Asteroids
2008
Arecibo Radar Observations of Comet 8P/Tuttle: A Possible Contact Binary
2008
Near-Earth asteroid surface roughness depends on compositional class
2008
Radio OH Observations of 8P/Tuttle
2008
Evidence for Space Weathering in the Near-Infrared Spectra of Primitive Asteroids
2008
Arecibo Radar Observations of 2001 SN$_{263}$: A Near-Earth Triple Asteroid System
2008
Detailed Characterization Of Asteroid (35107) 1991 VH
2008
Physical Modeling of Triple Near-Earth Asteroid 153591 (2001 SN263)
2008
Comet 8P/Tuttle: Arecibo Radar Observations of the First Bilobate Comet
2008
(153591) 2001 SN\_263
2008
Arecibo OH Mapping Observations of Comet C/2006 M4 SWAN
2007
Radio OH observations of 9P/Tempel 1 before and after Deep Impact
2007
Radar Observations of E-Class Asteroids 44 Nysa and 434 Hungaria
2007
Physical Modeling Of Near Earth Asteroid 2004wg1 From Arecibo Observatory Radar Data
2007
Arecibo radar observations of Phobos and Deimos
2007
Radar and Radio Observations of the Fragmented Comet 73P/Schwassmann-Wachmann3
2007
The Shape and Spin of 101955 (1999 RQ36) from Arecibo and Goldstone Radar Imaging
2007
Correlating Arecibo Radar and IRTF Near-Infrared Spectral Observations of 105 Artemis
2006
Radar Observations Of Comet 73P/Schwassmann-Wachmann 3
2006
Photometric survey of binary near-Earth asteroids
2006
OH Radio Mapping Observations of Comet 73P/Schwassmann-Wachmann 3
2006
Detection of large grains in the coma of Comet C/2001 A2 (LINEAR) from Arecibo radar observations
2006
Correlating IRTF Spectra and Arecibo Radar Observations of Low-Albedo Main-Belt Asteroids
2006
Physical Modeling of Near-Earth Asteroids 2005EU2 and 2002HK12
2005
Extreme Diversity of Near-Earth Asteroid Physical Properties from Arecibo Radar Imaging
2005
Radio OH Observations of Comet 9P/Tempel 1 before and after Deep Impact
2005
A Physical Model of the NEA 1988 XB (7753) using Arecibo Radar Data
2005
Arecibo Radar Imaging of 4 Vesta
2005
Water Distribution in the Asteroid Belt
2005
Tumbling asteroids
2005
The shape and spin state of asteroid 54509 (2000 PH5)
2005
Observations of 2002 NY 40: an ordinary chondrite?
2005
Deep Impact: Observations from a Worldwide Earth-Based Campaign
2005
A Long-Term Radar Survey of M-Class Asteroids
2005
(1862) Apollo
2005
Comet C/2002 T7 (LINEAR)
2004
2003 YT\_1
2004
Radar Images of Binary Asteroid 2003 YT1
2004
Properties of Horseshoe Object 2000 PH5 From Radar Observations
2004
Physical Characteristics of the Binary PHA 2003 YT1
2004
Recent observations of the 18-cm OH lines in bright comets with the Arecibo ALFA receiver
2004
Diversity of Types of Hydrated Minerals on C-Class Asteroids
2004
Observational constraints on excitation of the 18-cm OH lines in comets
2004
1937 UB (Hermes)
2003
Radar Observations of Near-Earth Asteroids
2003
Radar Observations of Binary Asteroid 5381 Sekhmet
2003
Observations of 2002 NY40: AN Ordinary Chondrite?
2003
2003 SS\_84
2003
The dynamics and shape of the minor planet 2000 PH5
2003
Spectroscopy and Photometry of the Earth Grazer 2002 NY40
2003
(5381) Sekhmet
2003
Spectroscopy and photometry of Mars Trojans
2003
Hydrated Minerals on Asteroids: The Astronomical Record
2002
Arecibo Radar Observations of Near-Earth Asteroids: A Study in Heterogeneity
2002
Radar Discovery and Characterization of Binary Near-Earth Asteroids
2002
Radar observations of asteroid 1999 JM8
2002
Spectral Line Mapping Observations of 18-cm OH Lines in Comets
2002
2002 BM\_26
2002
Taking Another Look at the 3-Micron Absorption Band on Asteroids
2002
Arecibo observations of the 18 cm OH lines of six comets
2002
Spectroscopy and Classification of Mars Trojan Asteroids
2002
2002 KK\_8
2002
Radar Observations of Near-Earth Asteroids 2000 UG11 and 2000 UK11
2001
Arecibo Radar Observations of Near-Earth Asteroid 2000 EE104
2001
Aqueous Alteration in Low Albedo Asteroids
2001
Observations of the 18-cm OH lines in Comet C/1999 S4 LINEAR and Comet C/2000 T1 McNaught-Hartley
2001
E-class Asteroids: Troilite, Hydrated Minerals, Both, or Neither?
2001
All-Stokes Parameterization of the Main Beam and First Sidelobe for the Arecibo Radio Telescope
2001
Arecibo Radar Observations of C/2001A2(B) (LINEAR)
2001
Arecibo Radar Observations of Three Small Near-Earth Asteroids
2001
The nature of M-class asteroids from 3-micron observations
2000
2000 UG\_11
2000
Radio Observations of OH in C/1999 LINEAR S4
2000
Arecibo Radar Observations of Main-Belt Asteroids in 2000
2000
Aqueous alteration of asteroids: correlation of the 3 {$\mu$}m and 0.7 {$\mu$}m hydration bands.
1999
Aqueous Alteration of Asteroids: Correlation of the 3 MU M and 0.7 MU M Hydration Bands
1999
0.7 {$\mu$} m Observations of Hydrated Central Belt Asteroids
1999
Supernova 1999bx in NGC 6745
1999
Testing the Prediction of Iron Alteration Minerals on Low Albedo Asteroids
1999
Testing the prediction of iron alteration minerals on low albedo asteroids.
1999
GPS measurement of surface deformation around Soufriere Hills Volcano, Montserrat from October 1995 to July 1996
1998
Prediction of Water in Asteroids from Spectral Data Shortward of 3 {$\mu$}m
1997
Three-Micron Survey of E- and M-class Asteroids: Final Results
1997
Physical model of near-earth asteroid 6489 golevka (1991 JX) from optical and infrared observations.
1997
S-class asteroids - The view from three microns
1997
Correlation of Water of Hydration with Diameter in Tholen E-class and M-class Asteroids
1997
S-Class Asteroid Spectral Trends with Size and Dynamical Population
1996
Prediction of Water in Asteroids from Short Wavelength ($\lt$ 3 Micron) Spectral Data: A Neural Network Study, II
1996
Spectral Trends of S-Class Asteroids with Size and Dynamical Population
1996
Spectral trends of S-class asteroids with size and dynamical population.
1996
Asteroid Classification Based on Water of Hydration: A Neural Network Study
1995
Physical Model of Near-Earth Asteroid (6489) 1991 JX from Optical and Infrared Observations
1995
Spectral Observations of the Mars Trojan 5261 Eureka
1995
3-{$\mu$}m Spectrophotometric Survey of M- and E-Class Asteroids
1995
Preliminary Results from CINE
1994
The Nature of Low Albedo Asteroids from 3-{$\mu$}m Spectrophotometry
1994
Volatiles in Asteroidal Surface Minerals
1994
'Wet' E and M class asteroids
1994
Visible and near-infrared spectral observations of 4179 Toutatis
1994
Spectral Observations of Near-Earth Asteroids
1994
Observations of ''Dry'' C Class Asteroids
1994
Hydrated E-class and M-class Asteroids
1994
The Comet Impact Network Experiment (CINE)
1994
Classification of asteroid spectra using a neural network
1994
Determination of Near-IR Continua for M-asteroids
1994
0.3 to 3.5 {$\mu$}m Observations of 4179 Toutatis
1993
0.4-3.5-micrometer Observations of 4179 Toutatis
1993
1.2 to 2.5 {$\mu$}m Observations of C Class Asteroids
1993
The 1.2 to 3.5 microns observations of asteroid 4179 Toutatis
1993
1993 KA
1993
CCD Observations of Near-Earth Asteroids
1993
Evidence for a near-Earth asteroid belt
1993
Near-IR Observations of M-class Asteroids
1992
Peculiar Asteroids with Earth-Like Orbits
1992
Compositional Trends Among Outer Belt Asteroids
1992
(4179) Toutatis
1992
A Neural Network Asteroid Classification Based on Water of Hydration
1992
1992 AD
1992
The Hydration State of Main-Belt C-Class Asteroids
1992
CCD Photometry of 2060 Chiron, 1991 January
1991
Characterization of low albedo asteroids
1991
The brightness, albedo, and temporal variability of Neptune
1991
Using neural networks to classify asteroid spectra
1991
Near-infrared observations of primitive asteroids and a possible extinct comet
1991
Near-Infrared Observations of Primitive Asteroids
1990
Origin of Ithaca Chasma on Tethys (S III) as a result of the Odysseus cratering event
1990

Gas and Dust Production by Comet P/Halley (1910 II)
1990

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Publications (394)