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

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2033572587747279 3.4149e-08  
a 2.618329839901435 1.1147e-08 au
q 2.085873461091007 9.4061e-08 au
i 4.109988490322745 2.9064e-06 deg
node 249.1782413364085 6.0548e-05 deg
peri 183.8602589751415 6.1677e-05 deg
M 352.1942810560877 1.4232e-05 deg
tp 2459430.054082557884
(2021-Aug-03.55408256)
6.1294e-05 TDB
period 1547.515329162476
4.24
9.8828e-06
2.706e-08
d
yr
n .2326309750965983 1.4856e-09 deg/d
Q 3.150786218711862 1.3414e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1652  
   data-arc span      13980 days (38.28 yr)  
   first obs. used      1982-11-04  
   last obs. used      2021-02-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47412  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 05:04:18  

Additional Information
 Earth MOID = 1.10052 au 
 Jupiter MOID = 2.13611 au 
 T_jup = 3.373 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.17   n/a E2021B10  
diameter diameter 3.559 km 0.783 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 3.18 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Erasmus, N.; McNeill, A.; Mommert, N.; Trilling, D.E.; et al. (2019) Ap. J. Suppl. Series 242, A15.]
geometric albedo albedo 0.266   0.094 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

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 | Mission Design | Physical Parameters | Discovery Circumstances ]
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