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Radar observations and shape model of asteroid 16 Psyche

Tutkimustuotosvertaisarvioitu

Standard

Radar observations and shape model of asteroid 16 Psyche. / Shepard, Michael K.; Richardson, James; Taylor, Patrick A.; Rodriguez-Ford, Linda A.; Conrad, Al; de Pater, Imke; Adamkovics, Mate; de Kleer, Katherine; Males, Jared R.; Morzinski, Katie M.; Close, Laird M.; Kaasalainen, Mikko; Viikinkoski, Matti; Timerson, Bradley; Reddy, Vishnu; Magri, Christopher; Nolan, Michael C.; Howell, Ellen S.; Benner, Lance A M; Giorgini, Jon D.; Warner, Brian D.; Harris, Alan W.

julkaisussa: Icarus, Vuosikerta 281, 2016, s. 388-403.

Tutkimustuotosvertaisarvioitu

Harvard

Shepard, MK, Richardson, J, Taylor, PA, Rodriguez-Ford, LA, Conrad, A, de Pater, I, Adamkovics, M, de Kleer, K, Males, JR, Morzinski, KM, Close, LM, Kaasalainen, M, Viikinkoski, M, Timerson, B, Reddy, V, Magri, C, Nolan, MC, Howell, ES, Benner, LAM, Giorgini, JD, Warner, BD & Harris, AW 2016, 'Radar observations and shape model of asteroid 16 Psyche', Icarus, Vuosikerta. 281, Sivut 388-403. https://doi.org/10.1016/j.icarus.2016.08.011

APA

Shepard, M. K., Richardson, J., Taylor, P. A., Rodriguez-Ford, L. A., Conrad, A., de Pater, I., ... Harris, A. W. (2016). Radar observations and shape model of asteroid 16 Psyche. Icarus, 281, 388-403. https://doi.org/10.1016/j.icarus.2016.08.011

Vancouver

Shepard MK, Richardson J, Taylor PA, Rodriguez-Ford LA, Conrad A, de Pater I et al. Radar observations and shape model of asteroid 16 Psyche. Icarus. 2016;281:388-403. https://doi.org/10.1016/j.icarus.2016.08.011

Author

Shepard, Michael K. ; Richardson, James ; Taylor, Patrick A. ; Rodriguez-Ford, Linda A. ; Conrad, Al ; de Pater, Imke ; Adamkovics, Mate ; de Kleer, Katherine ; Males, Jared R. ; Morzinski, Katie M. ; Close, Laird M. ; Kaasalainen, Mikko ; Viikinkoski, Matti ; Timerson, Bradley ; Reddy, Vishnu ; Magri, Christopher ; Nolan, Michael C. ; Howell, Ellen S. ; Benner, Lance A M ; Giorgini, Jon D. ; Warner, Brian D. ; Harris, Alan W. / Radar observations and shape model of asteroid 16 Psyche. Julkaisussa: Icarus. 2016 ; Vuosikerta 281. Sivut 388-403.

Bibtex - Lataa

@article{f0879ebfe1c8493db3bac34857fa18ae,
title = "Radar observations and shape model of asteroid 16 Psyche",
abstract = "Using the S-band radar at Arecibo Observatory, we observed 16 Psyche, the largest M-class asteroid in the main belt. We obtained 18 radar imaging and 6 continuous wave runs in November and December 2015, and combined these with 16 continuous wave runs from 2005 and 6 recent adaptive-optics (AO) images (Drummond et al., 2016) to generate a three-dimensional shape model of Psyche. Our model is consistent with a previously published AO image (Hanus et al., 2013) and three multi-chord occultations. Our shape model has dimensions 279 × 232 × 189 km (± 10{\%}), Deff = 226 ± 23 km, and is 6{\%} larger than, but within the uncertainties of, the most recently published size and shape model generated from the inversion of lightcurves (Hanus et al., 2013). Psyche is roughly ellipsoidal but displays a mass-deficit over a region spanning 90° of longitude. There is also evidence for two ∼50–70 km wide depressions near its south pole. Our size and published masses lead to an overall bulk density estimate of 4500 ± 1400 kgm−3. Psyche's mean radar albedo of 0.37 ± 0.09 is consistent with a near-surface regolith composed largely of iron-nickel and ∼40{\%} porosity. Its radar reflectivity varies by a factor of 1.6 as the asteroid rotates, suggesting global variations in metal abundance or bulk density in the near surface. The variations in radar albedo appear to correlate with large and small-scale shape features. Our size and Psyche's published absolute magnitude lead to an optical albedo of pv = 0.15 ± 0.03, and there is evidence for albedo variegations that correlate with shape features.",
keywords = "Asteroids, Asteroids Composition, Radar, Surfaces Asteroids",
author = "Shepard, {Michael K.} and James Richardson and Taylor, {Patrick A.} and Rodriguez-Ford, {Linda A.} and Al Conrad and {de Pater}, Imke and Mate Adamkovics and {de Kleer}, Katherine and Males, {Jared R.} and Morzinski, {Katie M.} and Close, {Laird M.} and Mikko Kaasalainen and Matti Viikinkoski and Bradley Timerson and Vishnu Reddy and Christopher Magri and Nolan, {Michael C.} and Howell, {Ellen S.} and Benner, {Lance A M} and Giorgini, {Jon D.} and Warner, {Brian D.} and Harris, {Alan W.}",
year = "2016",
doi = "10.1016/j.icarus.2016.08.011",
language = "English",
volume = "281",
pages = "388--403",
journal = "Icarus",
issn = "0019-1035",
publisher = "Elsevier",

}

RIS (suitable for import to EndNote) - Lataa

TY - JOUR

T1 - Radar observations and shape model of asteroid 16 Psyche

AU - Shepard, Michael K.

AU - Richardson, James

AU - Taylor, Patrick A.

AU - Rodriguez-Ford, Linda A.

AU - Conrad, Al

AU - de Pater, Imke

AU - Adamkovics, Mate

AU - de Kleer, Katherine

AU - Males, Jared R.

AU - Morzinski, Katie M.

AU - Close, Laird M.

AU - Kaasalainen, Mikko

AU - Viikinkoski, Matti

AU - Timerson, Bradley

AU - Reddy, Vishnu

AU - Magri, Christopher

AU - Nolan, Michael C.

AU - Howell, Ellen S.

AU - Benner, Lance A M

AU - Giorgini, Jon D.

AU - Warner, Brian D.

AU - Harris, Alan W.

PY - 2016

Y1 - 2016

N2 - Using the S-band radar at Arecibo Observatory, we observed 16 Psyche, the largest M-class asteroid in the main belt. We obtained 18 radar imaging and 6 continuous wave runs in November and December 2015, and combined these with 16 continuous wave runs from 2005 and 6 recent adaptive-optics (AO) images (Drummond et al., 2016) to generate a three-dimensional shape model of Psyche. Our model is consistent with a previously published AO image (Hanus et al., 2013) and three multi-chord occultations. Our shape model has dimensions 279 × 232 × 189 km (± 10%), Deff = 226 ± 23 km, and is 6% larger than, but within the uncertainties of, the most recently published size and shape model generated from the inversion of lightcurves (Hanus et al., 2013). Psyche is roughly ellipsoidal but displays a mass-deficit over a region spanning 90° of longitude. There is also evidence for two ∼50–70 km wide depressions near its south pole. Our size and published masses lead to an overall bulk density estimate of 4500 ± 1400 kgm−3. Psyche's mean radar albedo of 0.37 ± 0.09 is consistent with a near-surface regolith composed largely of iron-nickel and ∼40% porosity. Its radar reflectivity varies by a factor of 1.6 as the asteroid rotates, suggesting global variations in metal abundance or bulk density in the near surface. The variations in radar albedo appear to correlate with large and small-scale shape features. Our size and Psyche's published absolute magnitude lead to an optical albedo of pv = 0.15 ± 0.03, and there is evidence for albedo variegations that correlate with shape features.

AB - Using the S-band radar at Arecibo Observatory, we observed 16 Psyche, the largest M-class asteroid in the main belt. We obtained 18 radar imaging and 6 continuous wave runs in November and December 2015, and combined these with 16 continuous wave runs from 2005 and 6 recent adaptive-optics (AO) images (Drummond et al., 2016) to generate a three-dimensional shape model of Psyche. Our model is consistent with a previously published AO image (Hanus et al., 2013) and three multi-chord occultations. Our shape model has dimensions 279 × 232 × 189 km (± 10%), Deff = 226 ± 23 km, and is 6% larger than, but within the uncertainties of, the most recently published size and shape model generated from the inversion of lightcurves (Hanus et al., 2013). Psyche is roughly ellipsoidal but displays a mass-deficit over a region spanning 90° of longitude. There is also evidence for two ∼50–70 km wide depressions near its south pole. Our size and published masses lead to an overall bulk density estimate of 4500 ± 1400 kgm−3. Psyche's mean radar albedo of 0.37 ± 0.09 is consistent with a near-surface regolith composed largely of iron-nickel and ∼40% porosity. Its radar reflectivity varies by a factor of 1.6 as the asteroid rotates, suggesting global variations in metal abundance or bulk density in the near surface. The variations in radar albedo appear to correlate with large and small-scale shape features. Our size and Psyche's published absolute magnitude lead to an optical albedo of pv = 0.15 ± 0.03, and there is evidence for albedo variegations that correlate with shape features.

KW - Asteroids

KW - Asteroids Composition

KW - Radar

KW - Surfaces Asteroids

U2 - 10.1016/j.icarus.2016.08.011

DO - 10.1016/j.icarus.2016.08.011

M3 - Article

VL - 281

SP - 388

EP - 403

JO - Icarus

JF - Icarus

SN - 0019-1035

ER -