Radar and infrared observations of binary near-Earth Asteroid 2002 CE26
We observed near-Earth Asteroid (NEA) 2002 CE26 in August and September 2004 using the Arecibo S-band (2380-MHz, 12.6-cm) radar and NASA's Infrared Telescope Facility (IRTF). Shape models obtained based on inversion of our delay-Doppler images show the asteroid to be 3.5 ± 0.4 km in diameter...
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creator | Shepard, Michael K. Margot, Jean-Luc Magri, Christopher Nolan, Michael C. Schlieder, Joshua Estes, Benjamin Bus, Schelte J. Volquardsen, Eric L. Rivkin, Andrew S. Benner, Lance A.M. Giorgini, Jon D. Ostro, Steven J. Busch, Michael W. |
description | We observed near-Earth Asteroid (NEA) 2002 CE26 in August and September 2004 using the Arecibo S-band (2380-MHz, 12.6-cm) radar and NASA's Infrared Telescope Facility (IRTF). Shape models obtained based on inversion of our delay-Doppler images show the asteroid to be
3.5
±
0.4
km
in diameter and spheroidal; our corresponding nominal estimates of its visual and radar albedos are 0.07 and 0.24, respectively. Our IRTF spectrum shows the asteroid to be C-class with no evidence of hydration. Thermal models from the IRTF data provide a size and visual albedo consistent with the radar-derived estimate. We estimate the spin-pole to be within a few tens of degrees of
λ
=
317
°
,
β
=
−
20
°
. Our radar observations reveal a secondary approximately 0.3 km in diameter, giving this binary one of the largest size differentials of any known NEA. The secondary is in a near-circular orbit with period
15.6
±
0.1
h
and a semi-major axis of
4.7
±
0.2
km
. Estimates of the binary orbital pole and secondary rotation rate are consistent with the secondary being in a spin-locked equatorial orbit. The orbit corresponds to a primary mass of
M
=
1.95
±
0.25
×
10
13
kg
, leading to a primary bulk density of
ρ
=
0.9
+
0.5
/
−
0.4
g
cm
−3
, one of the lowest values yet measured for a main-belt or near-Earth asteroid. |
doi_str_mv | 10.1016/j.icarus.2006.04.019 |
format | Article |
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3.5
±
0.4
km
in diameter and spheroidal; our corresponding nominal estimates of its visual and radar albedos are 0.07 and 0.24, respectively. Our IRTF spectrum shows the asteroid to be C-class with no evidence of hydration. Thermal models from the IRTF data provide a size and visual albedo consistent with the radar-derived estimate. We estimate the spin-pole to be within a few tens of degrees of
λ
=
317
°
,
β
=
−
20
°
. Our radar observations reveal a secondary approximately 0.3 km in diameter, giving this binary one of the largest size differentials of any known NEA. The secondary is in a near-circular orbit with period
15.6
±
0.1
h
and a semi-major axis of
4.7
±
0.2
km
. Estimates of the binary orbital pole and secondary rotation rate are consistent with the secondary being in a spin-locked equatorial orbit. The orbit corresponds to a primary mass of
M
=
1.95
±
0.25
×
10
13
kg
, leading to a primary bulk density of
ρ
=
0.9
+
0.5
/
−
0.4
g
cm
−3
, one of the lowest values yet measured for a main-belt or near-Earth asteroid.</description><identifier>ISSN: 0019-1035</identifier><identifier>EISSN: 1090-2643</identifier><identifier>DOI: 10.1016/j.icarus.2006.04.019</identifier><identifier>CODEN: ICRSA5</identifier><language>eng</language><publisher>San Diego, CA: Elsevier Inc</publisher><subject>Asteroids ; Astronomy ; composition ; Earth, ocean, space ; Exact sciences and technology ; Radar observations ; Solar system ; surfaces</subject><ispartof>Icarus (New York, N.Y. 1962), 2006-09, Vol.184 (1), p.198-210</ispartof><rights>2006 Elsevier Inc.</rights><rights>2006 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c433t-50a8b44a4b2140feee88897dd4a95f4347e21cf4e623c134b2c7ea89b9088ba13</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S0019103506001357$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,776,780,3537,27901,27902,65534</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=18096938$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Shepard, Michael K.</creatorcontrib><creatorcontrib>Margot, Jean-Luc</creatorcontrib><creatorcontrib>Magri, Christopher</creatorcontrib><creatorcontrib>Nolan, Michael C.</creatorcontrib><creatorcontrib>Schlieder, Joshua</creatorcontrib><creatorcontrib>Estes, Benjamin</creatorcontrib><creatorcontrib>Bus, Schelte J.</creatorcontrib><creatorcontrib>Volquardsen, Eric L.</creatorcontrib><creatorcontrib>Rivkin, Andrew S.</creatorcontrib><creatorcontrib>Benner, Lance A.M.</creatorcontrib><creatorcontrib>Giorgini, Jon D.</creatorcontrib><creatorcontrib>Ostro, Steven J.</creatorcontrib><creatorcontrib>Busch, Michael W.</creatorcontrib><title>Radar and infrared observations of binary near-Earth Asteroid 2002 CE26</title><title>Icarus (New York, N.Y. 1962)</title><description>We observed near-Earth Asteroid (NEA) 2002 CE26 in August and September 2004 using the Arecibo S-band (2380-MHz, 12.6-cm) radar and NASA's Infrared Telescope Facility (IRTF). Shape models obtained based on inversion of our delay-Doppler images show the asteroid to be
3.5
±
0.4
km
in diameter and spheroidal; our corresponding nominal estimates of its visual and radar albedos are 0.07 and 0.24, respectively. Our IRTF spectrum shows the asteroid to be C-class with no evidence of hydration. Thermal models from the IRTF data provide a size and visual albedo consistent with the radar-derived estimate. We estimate the spin-pole to be within a few tens of degrees of
λ
=
317
°
,
β
=
−
20
°
. Our radar observations reveal a secondary approximately 0.3 km in diameter, giving this binary one of the largest size differentials of any known NEA. The secondary is in a near-circular orbit with period
15.6
±
0.1
h
and a semi-major axis of
4.7
±
0.2
km
. Estimates of the binary orbital pole and secondary rotation rate are consistent with the secondary being in a spin-locked equatorial orbit. The orbit corresponds to a primary mass of
M
=
1.95
±
0.25
×
10
13
kg
, leading to a primary bulk density of
ρ
=
0.9
+
0.5
/
−
0.4
g
cm
−3
, one of the lowest values yet measured for a main-belt or near-Earth asteroid.</description><subject>Asteroids</subject><subject>Astronomy</subject><subject>composition</subject><subject>Earth, ocean, space</subject><subject>Exact sciences and technology</subject><subject>Radar observations</subject><subject>Solar system</subject><subject>surfaces</subject><issn>0019-1035</issn><issn>1090-2643</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2006</creationdate><recordtype>article</recordtype><recordid>eNp9kMFKAzEQhoMoWKtv4CEXve062aS7yUUopVahIIiew2x2FlO2uzXZCr69KS148zQwfDM__8fYrYBcgCgfNrl3GPYxLwDKHFQOwpyxiQADWVEqec4mkFaZADm7ZFcxbgBgpo2csNUbNhg49g33fRswUMOHOlL4xtEPfeRDy2vfY_jhPWHIlhjGTz6PI4XBNzwFFnyxLMprdtFiF-nmNKfs42n5vnjO1q-rl8V8nTkl5ZjNAHWtFKq6EApaItJam6ppFJpZq6SqqBCuVVQW0gmZMFcRalMb0LpGIafs_vh3F4avPcXRbn101HXY07CPVhgJhYEqgeoIujDEGKi1u-C3qYcVYA_W7MYerdmDNQvKJkXp7O70H6PDLhnpnY9_txpMaaRO3OORo1T221Ow0XnqHTU-kBttM_j_g34BMjOCzA</recordid><startdate>20060901</startdate><enddate>20060901</enddate><creator>Shepard, Michael K.</creator><creator>Margot, Jean-Luc</creator><creator>Magri, Christopher</creator><creator>Nolan, Michael C.</creator><creator>Schlieder, Joshua</creator><creator>Estes, Benjamin</creator><creator>Bus, Schelte J.</creator><creator>Volquardsen, Eric L.</creator><creator>Rivkin, Andrew S.</creator><creator>Benner, Lance A.M.</creator><creator>Giorgini, Jon D.</creator><creator>Ostro, Steven J.</creator><creator>Busch, Michael W.</creator><general>Elsevier Inc</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>KL.</scope></search><sort><creationdate>20060901</creationdate><title>Radar and infrared observations of binary near-Earth Asteroid 2002 CE26</title><author>Shepard, Michael K. ; Margot, Jean-Luc ; Magri, Christopher ; Nolan, Michael C. ; Schlieder, Joshua ; Estes, Benjamin ; Bus, Schelte J. ; Volquardsen, Eric L. ; Rivkin, Andrew S. ; Benner, Lance A.M. ; Giorgini, Jon D. ; Ostro, Steven J. ; Busch, Michael W.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c433t-50a8b44a4b2140feee88897dd4a95f4347e21cf4e623c134b2c7ea89b9088ba13</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2006</creationdate><topic>Asteroids</topic><topic>Astronomy</topic><topic>composition</topic><topic>Earth, ocean, space</topic><topic>Exact sciences and technology</topic><topic>Radar observations</topic><topic>Solar system</topic><topic>surfaces</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Shepard, Michael K.</creatorcontrib><creatorcontrib>Margot, Jean-Luc</creatorcontrib><creatorcontrib>Magri, Christopher</creatorcontrib><creatorcontrib>Nolan, Michael C.</creatorcontrib><creatorcontrib>Schlieder, Joshua</creatorcontrib><creatorcontrib>Estes, Benjamin</creatorcontrib><creatorcontrib>Bus, Schelte J.</creatorcontrib><creatorcontrib>Volquardsen, Eric L.</creatorcontrib><creatorcontrib>Rivkin, Andrew S.</creatorcontrib><creatorcontrib>Benner, Lance A.M.</creatorcontrib><creatorcontrib>Giorgini, Jon D.</creatorcontrib><creatorcontrib>Ostro, Steven J.</creatorcontrib><creatorcontrib>Busch, Michael W.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><jtitle>Icarus (New York, N.Y. 1962)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Shepard, Michael K.</au><au>Margot, Jean-Luc</au><au>Magri, Christopher</au><au>Nolan, Michael C.</au><au>Schlieder, Joshua</au><au>Estes, Benjamin</au><au>Bus, Schelte J.</au><au>Volquardsen, Eric L.</au><au>Rivkin, Andrew S.</au><au>Benner, Lance A.M.</au><au>Giorgini, Jon D.</au><au>Ostro, Steven J.</au><au>Busch, Michael W.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Radar and infrared observations of binary near-Earth Asteroid 2002 CE26</atitle><jtitle>Icarus (New York, N.Y. 1962)</jtitle><date>2006-09-01</date><risdate>2006</risdate><volume>184</volume><issue>1</issue><spage>198</spage><epage>210</epage><pages>198-210</pages><issn>0019-1035</issn><eissn>1090-2643</eissn><coden>ICRSA5</coden><abstract>We observed near-Earth Asteroid (NEA) 2002 CE26 in August and September 2004 using the Arecibo S-band (2380-MHz, 12.6-cm) radar and NASA's Infrared Telescope Facility (IRTF). Shape models obtained based on inversion of our delay-Doppler images show the asteroid to be
3.5
±
0.4
km
in diameter and spheroidal; our corresponding nominal estimates of its visual and radar albedos are 0.07 and 0.24, respectively. Our IRTF spectrum shows the asteroid to be C-class with no evidence of hydration. Thermal models from the IRTF data provide a size and visual albedo consistent with the radar-derived estimate. We estimate the spin-pole to be within a few tens of degrees of
λ
=
317
°
,
β
=
−
20
°
. Our radar observations reveal a secondary approximately 0.3 km in diameter, giving this binary one of the largest size differentials of any known NEA. The secondary is in a near-circular orbit with period
15.6
±
0.1
h
and a semi-major axis of
4.7
±
0.2
km
. Estimates of the binary orbital pole and secondary rotation rate are consistent with the secondary being in a spin-locked equatorial orbit. The orbit corresponds to a primary mass of
M
=
1.95
±
0.25
×
10
13
kg
, leading to a primary bulk density of
ρ
=
0.9
+
0.5
/
−
0.4
g
cm
−3
, one of the lowest values yet measured for a main-belt or near-Earth asteroid.</abstract><cop>San Diego, CA</cop><pub>Elsevier Inc</pub><doi>10.1016/j.icarus.2006.04.019</doi><tpages>13</tpages></addata></record> |
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identifier | ISSN: 0019-1035 |
ispartof | Icarus (New York, N.Y. 1962), 2006-09, Vol.184 (1), p.198-210 |
issn | 0019-1035 1090-2643 |
language | eng |
recordid | cdi_proquest_miscellaneous_19302907 |
source | Elsevier ScienceDirect Journals Complete |
subjects | Asteroids Astronomy composition Earth, ocean, space Exact sciences and technology Radar observations Solar system surfaces |
title | Radar and infrared observations of binary near-Earth Asteroid 2002 CE26 |
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