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21004 (1988 BM4)
Classification: Main-belt Asteroid          SPK-ID: 2021004
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2051729974715485 6.8934e-08  
a 2.617828913274894 2.0429e-08 AU
q 2.080721108270597 1.7946e-07 AU
i 4.114434405889287 7.7673e-06 deg
node 249.2898633176203 9.5571e-05 deg
peri 182.730213098432 9.7404e-05 deg
M 156.3507027954376 1.6884e-05 deg
tp 2456328.595338773678
(2013-Feb-05.09533877)
7.3076e-05 JED
period 1547.071255304485
4.24
1.811e-05
4.958e-08
d
yr
n .232697749871351 2.7239e-09 deg/d
Q 3.154936718279191 2.4621e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      741  
   data-arc span      11554 days (31.63 yr)  
   first obs. used      1982-11-04  
   last obs. used      2014-06-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49271  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jan-08 02:48:38  

Additional Information
 Earth MOID = 1.09502 AU 
 T_jup = 3.373 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.0 mag n/a MPO299113  

21004 (1988 BM4)          Discovered 1988-Jan-22 by Debehogne, H. at La Silla
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1988 BM4 = 1999 RC82 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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