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21087 Petsimpallas (1992 BH2)
Classification: Main-belt Asteroid          SPK-ID: 2021087
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 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .18627802000337 2.8756e-08  
a 2.679378643760173 1.4295e-08 au
q 2.180269295161213 8.2394e-08 au
i 11.18597392084742 2.5947e-07 deg
node 274.0707351560266 4.3939e-06 deg
peri 55.78442585981525 4.9768e-06 deg
M 347.7322101448527 3.5371e-06 deg
tp 2459255.090037330710
(2021-Feb-09.59003733)
1.6042e-05 TDB
period 1601.952240061373
4.39
1.282e-05
3.51e-08
d
yr
n .224725800805527 1.7984e-09 deg/d
Q 3.178487992359134 1.6958e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1464  
   data-arc span      10527 days (28.82 yr)  
   first obs. used      1992-01-30  
   last obs. used      2020-11-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47995  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-17 02:53:14  

Additional Information
 Earth MOID = 1.18863 au 
 Jupiter MOID = 2.21099 au 
 T_jup = 3.325 
[ 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 13.4   n/a MPO384935  
diameter diameter 5.452 km 0.194 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 66.6113 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:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.312   0.036 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21087 Petsimpallas           Discovered 1992 Jan. 30 by E. W. Elst at the European Southern Observatory.
Peter Simon Pallas (1741-1811) was a German naturalist who lived and worked in Russia for most of his life. In 1768 he was sent by Catherine the Great on a mission to explore several provinces in the European part of Russia and in Siberia. An iron meteorite found near Krasnoyarsk gave rise to the classification pallasites.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20070402/MPCPages.arcLast Updated: 2007-07-05

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Alternate Designations
 1992 BH2 = 1998 KT43 = 1999 XV121 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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