Radar detection of Asteroid 2002 AA29

Steven J. Ostro; Jon D. Giorgini; Lance A.M. Benner; Alice A. Hine; Michael C. Nolan; Jean Luc Margot; Paul W. Chodas; Christian Veillet

doi:10.1016/j.icarus.2003.09.001

Radar detection of Asteroid 2002 AA29

Steven J. Ostro, Jon D. Giorgini, Lance A.M. Benner, Alice A. Hine, Michael C. Nolan, Jean Luc Margot, Paul W. Chodas, Christian Veillet

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

Radar echoes from Earth co-orbital Asteroid 2002 AA29 yield a total-power radar cross section of 2.9 × 10^-5 km² ±25%, a circular polarization ratio of SC/OC = 0.26 ± 0.07, and an echo bandwidth of at least 1.5 Hz. Combining these results with the estimate of its visual absolute magnitude, H_V = 25.23 ± 0.24, from reported Spacewatch photometry indicates an effective diameter of 25 ± 5 m, a rotation period no longer than 33 min, and an average surface bulk density no larger than 2.0 g cm^-3; the asteroid is radar dark and optically bright, and its statistically most likely spectral class is S. The H_V estimate from LINEAR photometry (23.58 ± 0.38) is not compatible with either Spacewatch's H_V or our radar results. If a bias this large were generally present in LINEAR's estimates of H_V for asteroids it has discovered or observed, then estimates of the current completeness of the Spaceguard Survey would have to be revised downward.

Original language	English (US)
Pages (from-to)	271-275
Number of pages	5
Journal	Icarus
Volume	166
Issue number	2
DOIs	https://doi.org/10.1016/j.icarus.2003.09.001
State	Published - Dec 2003
Externally published	Yes

Keywords

Asteroids
Photometry
Radar

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1016/j.icarus.2003.09.001

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title = "Radar detection of Asteroid 2002 AA29",

abstract = "Radar echoes from Earth co-orbital Asteroid 2002 AA29 yield a total-power radar cross section of 2.9 × 10-5 km2 ±25%, a circular polarization ratio of SC/OC = 0.26 ± 0.07, and an echo bandwidth of at least 1.5 Hz. Combining these results with the estimate of its visual absolute magnitude, HV = 25.23 ± 0.24, from reported Spacewatch photometry indicates an effective diameter of 25 ± 5 m, a rotation period no longer than 33 min, and an average surface bulk density no larger than 2.0 g cm-3; the asteroid is radar dark and optically bright, and its statistically most likely spectral class is S. The HV estimate from LINEAR photometry (23.58 ± 0.38) is not compatible with either Spacewatch's HV or our radar results. If a bias this large were generally present in LINEAR's estimates of HV for asteroids it has discovered or observed, then estimates of the current completeness of the Spaceguard Survey would have to be revised downward.",

keywords = "Asteroids, Photometry, Radar",

author = "Ostro, {Steven J.} and Giorgini, {Jon D.} and Benner, {Lance A.M.} and Hine, {Alice A.} and Nolan, {Michael C.} and Margot, {Jean Luc} and Chodas, {Paul W.} and Christian Veillet",

year = "2003",

month = dec,

doi = "10.1016/j.icarus.2003.09.001",

language = "English (US)",

volume = "166",

pages = "271--275",

journal = "Icarus",

issn = "0019-1035",

publisher = "Academic Press Inc.",

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TY - JOUR

T1 - Radar detection of Asteroid 2002 AA29

AU - Ostro, Steven J.

AU - Giorgini, Jon D.

AU - Benner, Lance A.M.

AU - Hine, Alice A.

AU - Nolan, Michael C.

AU - Margot, Jean Luc

AU - Chodas, Paul W.

AU - Veillet, Christian

PY - 2003/12

Y1 - 2003/12

N2 - Radar echoes from Earth co-orbital Asteroid 2002 AA29 yield a total-power radar cross section of 2.9 × 10-5 km2 ±25%, a circular polarization ratio of SC/OC = 0.26 ± 0.07, and an echo bandwidth of at least 1.5 Hz. Combining these results with the estimate of its visual absolute magnitude, HV = 25.23 ± 0.24, from reported Spacewatch photometry indicates an effective diameter of 25 ± 5 m, a rotation period no longer than 33 min, and an average surface bulk density no larger than 2.0 g cm-3; the asteroid is radar dark and optically bright, and its statistically most likely spectral class is S. The HV estimate from LINEAR photometry (23.58 ± 0.38) is not compatible with either Spacewatch's HV or our radar results. If a bias this large were generally present in LINEAR's estimates of HV for asteroids it has discovered or observed, then estimates of the current completeness of the Spaceguard Survey would have to be revised downward.

AB - Radar echoes from Earth co-orbital Asteroid 2002 AA29 yield a total-power radar cross section of 2.9 × 10-5 km2 ±25%, a circular polarization ratio of SC/OC = 0.26 ± 0.07, and an echo bandwidth of at least 1.5 Hz. Combining these results with the estimate of its visual absolute magnitude, HV = 25.23 ± 0.24, from reported Spacewatch photometry indicates an effective diameter of 25 ± 5 m, a rotation period no longer than 33 min, and an average surface bulk density no larger than 2.0 g cm-3; the asteroid is radar dark and optically bright, and its statistically most likely spectral class is S. The HV estimate from LINEAR photometry (23.58 ± 0.38) is not compatible with either Spacewatch's HV or our radar results. If a bias this large were generally present in LINEAR's estimates of HV for asteroids it has discovered or observed, then estimates of the current completeness of the Spaceguard Survey would have to be revised downward.

KW - Asteroids

KW - Photometry

KW - Radar

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U2 - 10.1016/j.icarus.2003.09.001

DO - 10.1016/j.icarus.2003.09.001

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SN - 0019-1035

VL - 166

SP - 271

EP - 275

JO - Icarus

JF - Icarus

IS - 2

ER -

Radar detection of Asteroid 2002 AA29

Abstract

Keywords

ASJC Scopus subject areas

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