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91551 (1999 RA212)
Classification: Main-belt Asteroid          SPK-ID: 2091551
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1353029021254433 5.064e-08  
a 3.0576206393626 2.1446e-08 au
q 2.643915693258187 1.5767e-07 au
i 10.09367063245988 5.9521e-06 deg
node 328.7298216846216 2.2005e-05 deg
peri 159.1776405798043 2.6566e-05 deg
M 217.0167164777328 1.5268e-05 deg
tp 2459776.133564196271
(2022-Jul-15.63356420)
8.6148e-05 TDB
period 1952.872225564555
5.35
2.0546e-05
5.625e-08
d
yr
n .1843438578762765 1.9395e-09 deg/d
Q 3.471325585467013 2.4348e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1008  
   data-arc span      11168 days (30.58 yr)  
   first obs. used      1990-01-01  
   last obs. used      2020-07-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52793  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 08:17:56  

Additional Information
 Earth MOID = 1.6613 au 
 Jupiter MOID = 1.5826 au 
 T_jup = 3.197 
[ 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 13.9   n/a MPO436411  
diameter diameter 10.294 km 1.583 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 12.347 h n/a LCDB (Rev. 2019-August); 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 0.046   0.016 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

91551 (1999 RA212)          Discovered 1999-Sep-08 by LINEAR at Socorro
Reference: 20041028/Numbers.arcLast Updated: 2004-10-29

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Alternate Designations
 1999 RA212 = 1990 AN = 1993 PN8 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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