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21996 (1999 XP31)
Classification: Main-belt Asteroid          SPK-ID: 2021996
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1367195078128292 1.3202e-08  
a 2.564261754084063 9.8538e-09 au
q 2.213677149162427 3.2782e-08 au
i 16.02145461667644 5.8236e-07 deg
node 114.1419165083898 1.7155e-06 deg
peri 226.3896177108285 8.2114e-06 deg
M 156.0109188330226 7.5116e-06 deg
tp 2458550.528291897556
(2019-Mar-08.02829190)
2.9761e-05 TDB
period 1499.829734143914
4.11
8.6452e-06
2.367e-08
d
yr
n .2400272456296408 1.3835e-09 deg/d
Q 2.914846359005698 1.1201e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2328  
   data-arc span      25597 days (70.08 yr)  
   first obs. used      1951-02-04  
   last obs. used      2021-03-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4377  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-17 03:07:24  

Additional Information
 Earth MOID = 1.22813 au 
 Jupiter MOID = 2.45947 au 
 T_jup = 3.366 
[ 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 12.97   n/a E2021B10  
diameter diameter 6.807 km 0.146 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 6.872 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.359   0.045 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

21996 (1999 XP31)          Discovered 1999-Dec-06 by LINEAR at Socorro
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 XP31 = 1969 OT 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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