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Arecibo and Goldstone Radar Imaging of Contact Binary Near-Earth Asteroids. L. A. M. Benner, M. C. Nolan, J. L. Margot, S. J. Ostro, M. K. Shepard, C. Magri, J. D. Giorgini, and M. W. Busch. Outline. Overview of NEAs detected by radar Updated binary NEA statistics 2005 NB7 (1139) Atami

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Arecibo and Goldstone Radar Imaging of Contact Binary Near-Earth Asteroids


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arecibo and goldstone radar imaging of contact binary near earth asteroids
Arecibo and Goldstone Radar Imaging of Contact BinaryNear-Earth Asteroids

L. A. M. Benner, M. C. Nolan, J. L. Margot,

S. J. Ostro, M. K. Shepard, C. Magri,

J. D. Giorgini, and M. W. Busch

outline
Outline
  • Overview of NEAs detected by radar
  • Updated binary NEA statistics
  • 2005 NB7
  • (1139) Atami
  • Smorgasbord of contact binaries
  • Upcoming NEA radar targets
  • Historical note
binary neas statistics for radar targets
Binary NEAs: Statistics for Radar Targets

OVERALL

Discovered by radar: 21/33 = 64%

Detected by radar 25/33 = 76%

Discovered at Arecibo: 17/33 = 52% (Includes Sisyphus)

Discovered at Goldstone: 4/33 = 12%

Since completion of the upgrade at Arecibo in 1999:

Discovered by radar: 20/25 = 80%

Detected by radar: 23/25 = 92%

Abundance among radar targets: 17%

Arecibo has become the primary technique for discovery and characterization of binary NEAs.

binary neas detected by radar
2000 DP107 2000

2000 UG11 2000

1999 KW4 2001, 2002

1998 ST27 2001, 2004

2002 BM26 2002

2002 KK8 2002

Sekhmet 2003

1998 RO1 2003, 2004

2003 SS84 2003

Hermes 2003

1990 OS 2003 (1990)

Didymos 2003

1999 DJ4 2004

2003 YT1 2004

2002 CE26 2004

2005 AB 2005

1994 XD 2005

Apollo 2005 (1980)

2006 GY2 2006

2004 DC 2006

2006 VV2 2007

2007 DT103 2007

2001 SN263 2008

2005 NB7 2008

Binary NEAs Detected by Radar

Sisyphus 1985

contact binary candidates detected by radar
Contact Binary Candidates Detected by Radar

Not included:

3908 Nyx

4179 Toutatis

25143 Itokawa

2201 Oljato (?) 1983 Jun

4769 Castalia 1989 Aug

2064 Bacchus 1996 Mar

4486 Mithra 2000 Jul-Aug

2000 YF29 2001 Jan

2002 FC 2002 Jun

2002 NY40 2002 Aug

141593 2002 HK12 2002 Aug

52387 1993 OM7 2003 Jan

68346 2001 KZ66 2003 Oct

11066 Sigurd 2004 Sep

2005 CR37 2005 Feb

2004 RF84 2005 Feb

2004 XL14 2006 Dec

2007 VD12 2007 Nov

2007 TU24 2008 Jan-Feb

2002 TD66 2008 Feb

4450 Pan 2008 Feb

Abundance: ~11%

among NEAs > 200 m

in diameter

what can we estimate for each
What can we estimate for each?

ObjectShape? Class

Oljato No S

Castalia Available

Bacchus Available Q

Mithra Maybe

2000 YF29 No S

2002 FC No

2002 NY40 Maybe S

2002 HK12 Maybe X

1993 OM7 No

2001 KZ66 Yes S

Sigurd Yes S

2005 CR37 No C?

2004 RF84 No

2004 XL14 Not yet C Returns in December

2007 VD12 No S

2007 TU24 No S

2002 TD66 No S

Pan No S

4450 pan arecibo feb 2008
(4450) PanArecibo, Feb. 2008

Feb. 13

Feb. 12

Feb. 14

upcoming radar opportunities
Upcoming Radar Opportunities:

55319 1999 JM8 May-June A

2008 BT18 July A, G

90403 2003 YE45 July A, G

2005 RC34 July A, G

35107 1991 VH August A, G

2000 DP107 September A, G

8567 1996 HW1 September A

137032 1998 UO1 September A

164400 2005 GN59 October A, G

85774 1998 UT18 November A

2004 XL14 December A

2008 EV5 December A, G

2004 LV3 December A

136849 1998 CS1 January A, G

nea radar detection history
NEA Radar Detection History

40th anniversary of the 1st asteroid radar detection is in

June: 1566 Icarus by Dick Goldstein at Goldstone