A refined "standard" thermal model for asteroids based on observations of 1 Ceres and 2 Pallas

Larry A. Lebofsky; Mark V. Sykes; Edward F. Tedesco; Glenn J. Veeder; Dennis L. Matson; Robert H. Brown; Jonathan C. Gradie; Michael A. Feierberg; Richard J. Rudy

doi:10.1016/0019-1035(86)90021-7

A refined "standard" thermal model for asteroids based on observations of 1 Ceres and 2 Pallas

Larry A. Lebofsky, Mark V. Sykes, Edward F. Tedesco, Glenn J. Veeder, Dennis L. Matson, Robert H. Brown, Jonathan C. Gradie, Michael A. Feierberg, Richard J. Rudy

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

293 Scopus citations

Abstract

We present ground-based thermal infrared observations of asteroids 1 Ceres and 2 Pallas made over a period of 2 years. By analysing these data in light of the recently determined occultation diameter of Ceres (933-945 km) and Pallas (538 km) and their known small-amplitude lightcurves, we have determined a new value for the infrared beaming parameter used in the "standard" thermal emission model for asteroids. The new value is significantly lower than that previously used, and when applied in the reduction of thermal infrared observations of other asteroids, should yield model diameters that are closer to actual diameters. In our formulation, we also incorporate the recently adopted IAU magnitude convention for asteroids, which uses the zero-phase magnitudes (including the opposition effect) the same as is used for satellites.

Original language	English (US)
Pages (from-to)	239-251
Number of pages	13
Journal	Icarus
Volume	68
Issue number	2
DOIs	https://doi.org/10.1016/0019-1035(86)90021-7
State	Published - Nov 1986
Externally published	Yes

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1016/0019-1035(86)90021-7

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@article{53ff70ce3c594bfd8f1c4a8609d9f2d5,

title = "A refined {"}standard{"} thermal model for asteroids based on observations of 1 Ceres and 2 Pallas",

abstract = "We present ground-based thermal infrared observations of asteroids 1 Ceres and 2 Pallas made over a period of 2 years. By analysing these data in light of the recently determined occultation diameter of Ceres (933-945 km) and Pallas (538 km) and their known small-amplitude lightcurves, we have determined a new value for the infrared beaming parameter used in the {"}standard{"} thermal emission model for asteroids. The new value is significantly lower than that previously used, and when applied in the reduction of thermal infrared observations of other asteroids, should yield model diameters that are closer to actual diameters. In our formulation, we also incorporate the recently adopted IAU magnitude convention for asteroids, which uses the zero-phase magnitudes (including the opposition effect) the same as is used for satellites.",

author = "Lebofsky, {Larry A.} and Sykes, {Mark V.} and Tedesco, {Edward F.} and Veeder, {Glenn J.} and Matson, {Dennis L.} and Brown, {Robert H.} and Gradie, {Jonathan C.} and Feierberg, {Michael A.} and Rudy, {Richard J.}",

note = "Funding Information: We thank B. Golish, D. Griep, C. Kaminski, and G. Koenig for their assistance in making these observations. This work was supported by NASA Grant NSG-7114 and NSF Grant AST-8206173 to the University of Arizona, and by the United States Air Force. RJR received support from Aerospace Sponsored Research funds. This paper also presents the results of one phase of research carried out at the Jet Propulsion Laboratory, California Institute of Technology, under contract to NASA.",

year = "1986",

month = nov,

doi = "10.1016/0019-1035(86)90021-7",

language = "English (US)",

volume = "68",

pages = "239--251",

journal = "Icarus",

issn = "0019-1035",

publisher = "Academic Press Inc.",

number = "2",

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TY - JOUR

T1 - A refined "standard" thermal model for asteroids based on observations of 1 Ceres and 2 Pallas

AU - Lebofsky, Larry A.

AU - Sykes, Mark V.

AU - Tedesco, Edward F.

AU - Veeder, Glenn J.

AU - Matson, Dennis L.

AU - Brown, Robert H.

AU - Gradie, Jonathan C.

AU - Feierberg, Michael A.

AU - Rudy, Richard J.

N1 - Funding Information: We thank B. Golish, D. Griep, C. Kaminski, and G. Koenig for their assistance in making these observations. This work was supported by NASA Grant NSG-7114 and NSF Grant AST-8206173 to the University of Arizona, and by the United States Air Force. RJR received support from Aerospace Sponsored Research funds. This paper also presents the results of one phase of research carried out at the Jet Propulsion Laboratory, California Institute of Technology, under contract to NASA.

PY - 1986/11

Y1 - 1986/11

N2 - We present ground-based thermal infrared observations of asteroids 1 Ceres and 2 Pallas made over a period of 2 years. By analysing these data in light of the recently determined occultation diameter of Ceres (933-945 km) and Pallas (538 km) and their known small-amplitude lightcurves, we have determined a new value for the infrared beaming parameter used in the "standard" thermal emission model for asteroids. The new value is significantly lower than that previously used, and when applied in the reduction of thermal infrared observations of other asteroids, should yield model diameters that are closer to actual diameters. In our formulation, we also incorporate the recently adopted IAU magnitude convention for asteroids, which uses the zero-phase magnitudes (including the opposition effect) the same as is used for satellites.

AB - We present ground-based thermal infrared observations of asteroids 1 Ceres and 2 Pallas made over a period of 2 years. By analysing these data in light of the recently determined occultation diameter of Ceres (933-945 km) and Pallas (538 km) and their known small-amplitude lightcurves, we have determined a new value for the infrared beaming parameter used in the "standard" thermal emission model for asteroids. The new value is significantly lower than that previously used, and when applied in the reduction of thermal infrared observations of other asteroids, should yield model diameters that are closer to actual diameters. In our formulation, we also incorporate the recently adopted IAU magnitude convention for asteroids, which uses the zero-phase magnitudes (including the opposition effect) the same as is used for satellites.

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A refined "standard" thermal model for asteroids based on observations of 1 Ceres and 2 Pallas

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