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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1357820781535122 4.7057e-08  
a 3.056860470878264 1.9463e-08 au
q 2.641793603517089 1.4957e-07 au
i 10.094806907694 5.2834e-06 deg
node 328.732240834563 1.8489e-05 deg
peri 159.215079754598 2.3374e-05 deg
M 290.0373260180134 1.5428e-05 deg
tp 2459775.881151172078
(2022-Jul-15.38115117)
8.5484e-05 TDB
period 1952.144002630787
5.34
1.8644e-05
5.104e-08
d
yr
n .184412625049612 1.7613e-09 deg/d
Q 3.471927338239438 2.2106e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1294  
   data-arc span      11519 days (31.54 yr)  
   first obs. used      1990-01-01  
   last obs. used      2021-07-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50322  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 18:17:42  

Additional Information
 Earth MOID = 1.65975 au 
 Jupiter MOID = 1.58121 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 13.98   n/a E2021B10  
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. 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 0.046   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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