BINARY NEAR-EARTH ASTEROIDS DETECTED BY RADAR


http://echo.jpl.nasa.gov/~lance/binary.neas.html


CHRONOLOGICAL ORDER 
                                                                            
  Asteroid           a (AU)      e      i (deg)  H (mag)  Q (AU)  q (AU)    order date      Observatory
  ========           ======      =      =======  =======  ======  ======    ===== ====      ===========
      2000 DP107      1.365     0.377      8.7    18.2    1.880   0.850  PHA   1  Sep 2000  Goldstone & Arecibo
      2000 UG11       1.934     0.573      8.9    20.4    3.042   0.826  PHA   2  Nov 2000  Arecibo & Goldstone
66391 1999 KW4        0.642     0.688     38.9    16.3    1.084   0.200  PHA   3  May 2001  Goldstone & Arecibo
      1998 ST27       0.819     0.530     21.0    19.4    1.253   0.385  PHA   4  Oct 2001  Arecibo
      2002 BM26       1.832     0.444     16.2    19.8    2.645   1.019  PHA   5  Feb 2002  Arecibo
      2002 KK8        1.967     0.469     24.6    20.3    2.889   1.045  PHA   6  Jun 2002  Arecibo
 5381 Sekhmet         0.948     0.296     49.0    16.5    1.228   0.667        7  May 2003  Arecibo
66063 1998 RO1        0.991     0.720     22.7    17.9    1.705   0.277        8  Sep 2003  Arecibo 
      2003 SS84       1.932     0.572      5.5    21.7    3.037   0.827  PHA   9  Sep 2003  Arecibo & Goldstone
69230 Hermes          1.654     0.624      6.1    17.5    2.686   0.622  PHA  10  Oct 2003  Arecibo & Goldstone
      1990 OS         1.680     0.463      1.1    20.0    2.458   0.902  PHA  11  Nov 2003  Arecibo
65803 Didymos         1.642     0.383      3.4    17.9    2.275   1.013  PHA  12  Nov 2003  Arecibo
85938 1999 DJ4        1.851     0.483      9.2    18.4    2.745   0.957  PHA  13  Apr 2004  Arecibo
      2003 YT1        1.110     0.292     44.1    16.2    1.434   0.785  PHA  14  May 2004  Arecibo
      2002 CE26       2.233     0.559     47.4    16.5    3.481   0.984       15  Aug 2004  Arecibo

ORDERED BY ASTEROID NUMBER AND PROVISIONAL DESIGNATION  

 5381 Sekhmet         0.948     0.296     49.0    16.5    1.228   0.667        7  May 2003  Arecibo
65803 Didymos         1.642     0.383      3.4    17.9    2.275   1.013  PHA  12  Nov 2003  Arecibo
66063 1998 RO1        0.991     0.720     22.7    17.9    1.705   0.277        8  Sep 2003  Arecibo
66391 1999 KW4        0.642     0.688     38.9    16.3    1.084   0.200  PHA   3  May 2001  Goldstone & Arecibo
69230 Hermes          1.654     0.624      6.1    17.5    2.686   0.622  PHA  10  Oct 2003  Arecibo & Goldstone
85938 1999 DJ4        1.851     0.483      9.2    18.4    2.745   0.957  PHA  12  Apr 2004  Arecibo
      1990 OS         1.680     0.463      1.1    20.0    2.458   0.902  PHA  11  Nov 2003  Arecibo
      1998 ST27       0.819     0.530     21.0    19.4    1.253   0.385  PHA   4  Oct 2001  Arecibo
      2000 DP107      1.365     0.377      8.7    18.2    1.880   0.850  PHA   1  Sep 2000  Goldstone & Arecibo
      2000 UG11       1.934     0.573      8.9    20.4    3.042   0.826  PHA   2  Nov 2000  Arecibo & Goldstone
      2002 BM26       1.832     0.444     16.2    19.8    2.645   1.019  PHA   5  Feb 2002  Arecibo 
      2002 CE26       2.233     0.559     47.4    16.5    3.481   0.984       15  Aug 2004  Arecibo
      2002 KK8        1.967     0.469     24.6    20.3    2.889   1.045  PHA   6  Jun 2002  Arecibo
      2003 SS84       1.932     0.572      5.5    21.7    3.037   0.827  PHA   9  Sep 2003  Arecibo & Goldstone
      2003 YT1        1.110     0.292     44.1    16.2    1.434   0.785  PHA  14  May 2004  Arecibo

= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = 

DELTA-V RANKINGS
================

Delta-v rankings for _all_ NEA binaries observed by radar and photometrically.

Rankings last updated: 2004 October 19
Number of NEAs in the MPC database = 3033

SPACECRAFT RENDEZVOUS
---------------------
                                                      DELTA-V (ASTEROID)/
                                PROVISIONAL  DELTA-V    DELTA-V FOR 
RANK  ASTEROID NAME             DESIGNATION  (KM/S)    THE MOON MARS   H (mag) a (AU)  e     i (deg)
====  =============             ===========  =======   ======== ====   ======= ======  ===   ========
  95  (65803) Didymos            1996 GT      5.102    0.850   0.810    18.4   1.645  0.384    3.4   
 242                             1990 OS      5.685    0.947   0.902    19.3   1.678  0.463    1.1   
 354                             2000 DP107   5.966    0.994   0.947    18.2   1.366  0.377    8.7   
 393  (85938)                    1999 DJ4     6.043    1.007   0.959    18.6   1.852  0.483    9.2   
 598  (35107)                    1991 VH      6.370    1.062   1.011    16.9   1.136  0.144   13.9   
 804                             1996 FG3     6.609    1.102   1.049    18.2   1.054  0.350    2.0   
 825                             2003 SS84    6.634    1.106   1.053    21.8   1.931  0.571    5.5   
 846  (31345)                    1998 PG      6.656    1.109   1.056    17.3   2.015  0.392    6.5   
 924                             2002 BM26    6.739    1.123   1.070    20.1   1.833  0.445   16.2   
 937   (3671) Dionysus           1984 KD      6.747    1.125   1.071    16.3   2.198  0.542   13.5   
1047                             2000 UG11    6.865    1.144   1.090    20.4   1.929  0.572    8.9   
1641  (69230) Hermes             1937 UB      7.777    1.296   1.234    17.5   1.655  0.624    6.1   
1918                             2002 KK8     8.486    1.414   1.347    21.0   1.953  0.465   24.5   
2198  (88710)                    2001 SL9     9.322    1.554   1.480    17.6   1.061  0.270   21.9   
2433                             1994 AW1    10.252    1.709   1.627    17.7   1.105  0.075   24.1   
2748                             1998 ST27   12.887    2.148   2.046    19.5   0.819  0.530   21.0   
2764                             1999 HF1    13.032    2.172   2.069    14.5   0.819  0.462   25.7   
2837                             2002 CE26   14.110    2.352   2.240    16.9   2.233  0.559   47.4   
2947                             2003 YT1    16.470    2.745   2.614    16.4   1.110  0.292   44.1   
2994   (5381) Sekhmet            1991 JY     18.892    3.149   2.999    16.5   0.947  0.296   49.0   
3003  (66063)                    1998 RO1    19.402    3.234   3.080    18.1   0.991  0.720   22.7   
3020  (66391)                    1999 KW4    21.300    3.550   3.381    16.5   0.642  0.688   38.9   


SPACECRAFT FLYBY
----------------
                                Provisional   Delta-v   H       a     e       i
Rank  Asteroid number and name  Designation   (km/s)  (mag)   (AU)           (deg)
====  ========================  ===========   ======= =====   =====  =====   =====
  68                             1996 FG3     4.020    18.2   1.054  0.350    2.0    
 248  (35107)                    1991 VH      4.498    16.9   1.136  0.144   13.9    
 380                             2000 DP107   4.775    18.2   1.366  0.377    8.7    
 505  (65803) Didymos            1996 GT      5.000    18.4   1.645  0.384    3.4    
 607                             1990 OS      5.145    19.3   1.678  0.463    1.1    
 776  (88710)                    2001 SL9     5.400    17.6   1.061  0.270   21.9    
 839  (69230) Hermes             1937 UB      5.481    17.5   1.655  0.624    6.1    
 875                             1994 AW1     5.526    17.7   1.105  0.075   24.1    
 945  (31345)                    1998 PG      5.600    17.3   2.015  0.392    6.5    
1029  (85938)                    1999 DJ4     5.686    18.6   1.852  0.483    9.2    
1099                             2003 SS84    5.749    21.8   1.931  0.571    5.5    
1302                             2000 UG11    5.905    20.4   1.929  0.572    8.9    
1576                             2002 BM26    6.155    20.1   1.833  0.445   16.2    
1908   (3671) Dionysus           1984 KD      6.489    16.3   2.198  0.542   13.5    
2191                             1999 HF1     6.886    14.5   0.819  0.462   25.7    
2316                             1998 ST27    7.171    19.5   0.819  0.530   21.0    
2380                             2002 KK8     7.331    21.0   1.953  0.465   24.5    
2541  (66391)                    1999 KW4     7.877    16.5   0.642  0.688   38.9    
2792                             2003 YT1     9.168    16.4   1.110  0.292   44.1    
2924   (5381) Sekhmet            1991 JY     10.775    16.5   0.947  0.296   49.0    
2960                             2002 CE26   11.823    16.9   2.233  0.559   47.4    
3033  (66063)                    1998 RO1    18.576    18.1   0.991  0.720   22.7    

Percentile rankings for all binaries:

                  Rendezvous  Rendezvous   Flyby  Flyby
Object            Rank        Percentile   Rank   Percentile  RADAR? LIGHTCURVES?
------            ----------  ----------   -----  ----------  ------ ------------
 3671 Dionysus     937          69.1       1908    37.1       NO     YES
 5381 Sekhmet     2994           1.3       2924     3.6       YES    NO
31345 1998 PG      846          72.1        945    68.8       NO     YES
35107 1991 VH      598          80.2        248    91.8       NO     YES
65803 Didymos       95          96.9        505    83.3       YES    YES
66063 1998 RO1    3003           1.0       3033     0.0       YES    YES
66391 1999 KW4    3020           0.4       2541    16.2       YES    YES
69230 Hermes      1641          45.9        839    72.3       YES    YES
85938 1999 DJ4     393          87.0       1029    66.1       YES    YES
88710 2001 SL9    2198          27.5        776    74.4       NO     YES
      1990 OS      242          92.0        607    80.0       YES    NO
      1994 AW1    2433          19.8        875    71.2       NO     YES
      1996 FG3     804          73.5         68    97.8       NO     YES
      1998 ST27   2748           9.4       2316    23.6       YES    NO
      1999 HF1    2764           8.9       2191    27.8       NO     YES
      2000 DP107   354          88.3        380    87.5       YES    YES
      2000 UG11   1047          65.5       1302    57.1       YES    YES
      2002 BM26    924          69.5       1576    48.0       YES    NO
      2002 CE26   2837           6.5       2960     2.4       YES    NO
      2002 KK8    1918          36.8       2380    21.5       YES    NO
      2003 SS84    825          72.8       1099    63.8       YES    NO
      2003 YT1    2947           2.8       2792     7.9       YES    YES

= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = 

NEA binaries with H < 22.0 (diameters > ~200 meters) detected since 
January 1, 1999: 15/83 = 18.1% (this includes 2003 SS84, which is probably < 200 m 
in diameter)

PHA = "Potentially Hazardous Asteroids" as defined by the Minor Planet Center

Note: 1990 OS was first detected by radar in 1990 but was unrecognized as a binary
system until November, 2003.

1998 RO1, 1999 KW4, 1996 GT, and 1999 DJ4 were strongly suspected of being binaries based on 
lightcurves prior to observations by radar.  In the case of 1996 GT, the lightcurves provided
strong evidence for a binary only hours prior to the radar detection.

Website last updated: 2004 December 14


Lance Benner
Last modified: Tue Oct 19 10:01:59 PDT 2004