Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics

Significant website upgrade scheduled for September 27. More details available here.

JPL Small-Body Database Browser
Search: [ help ]  
21087 Petsimpallas (1992 BH2)
Classification: Main-belt Asteroid          SPK-ID: 2021087
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ hide orbit diagram ]

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 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1858927735012507 2.8682e-08  
a 2.678073116832723 1.421e-08 au
q 2.180238677505549 8.204e-08 au
i 11.18468346794252 2.5937e-07 deg
node 274.0569869979579 4.3947e-06 deg
peri 55.73176808489988 4.9844e-06 deg
M 31.8476495968377 3.7678e-06 deg
tp 2459254.885749775382
1.5951e-05 TDB
period 1600.781556134822
n .224890147328559 1.7899e-09 deg/d
Q 3.175907556159897 1.6851e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1475  
   data-arc span      10764 days (29.47 yr)  
   first obs. used      1992-01-30  
   last obs. used      2021-07-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48306  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 14:57:11  

Additional Information
 Earth MOID = 1.18975 au 
 Jupiter MOID = 2.21205 au 
 T_jup = 3.326 
[ 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 13.4   n/a MPO384935  
diameter diameter 5.452 km 0.194 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
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] (  

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

Alternate Designations
 1992 BH2 = 1998 KT43 = 1999 XV121 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
FirstGov 2021-Sep-22 03:48 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin