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20999 (1987 BF)
Classification: Main-belt Asteroid          SPK-ID: 2020999
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1286539155594836 1.2528e-08  
a 2.27885231295159 8.0535e-09 au
q 1.985669039908582 2.7528e-08 au
i 5.071149985196664 7.0036e-07 deg
node 293.1609719864753 7.8798e-06 deg
peri 301.7049320179234 9.8822e-06 deg
M 214.2019893175786 7.0001e-06 deg
tp 2459709.387513988142
(2022-May-09.88751399)
2.5812e-05 TDB
period 1256.529524499329
3.44
6.6609e-06
1.824e-08
d
yr
n .2865034151453336 1.5188e-09 deg/d
Q 2.572035585994597 9.0896e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1749  
   data-arc span      12457 days (34.11 yr)  
   first obs. used      1987-01-28  
   last obs. used      2021-03-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50883  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:35:49  

Additional Information
 Earth MOID = .978142 au 
 Jupiter MOID = 2.44742 au 
 T_jup = 3.591 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.44   n/a E2021B10  
diameter diameter 4.198 km 0.995 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  
rotation period rot_per 69.226 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.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.]
geometric albedo albedo 0.188   0.087 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  

20999 (1987 BF)          Discovered 1987-Jan-28 by Niijima, T., Urata, T. at Ojima
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1987 BF = 1998 MF20 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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