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JPL Small-Body Database Browser
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18852 (1999 RP91)
Classification: Main-belt Asteroid          SPK-ID: 2018852
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 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1610388443894852 3.3961e-08  
a 3.173245767284472 1.9685e-08 au
q 2.662229935957155 1.1272e-07 au
i 1.44131528359424 3.8867e-06 deg
node 56.72218914611291 0.00015401 deg
peri 236.4012921477194 0.00015451 deg
M 285.258973663842 1.3735e-05 deg
tp 2459429.157619163888
(2021-Aug-02.65761916)
8.0494e-05 TDB
period 2064.685895600885
5.65
1.9213e-05
5.26e-08
d
yr
n .174360662203889 1.6225e-09 deg/d
Q 3.684261598611789 2.2856e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1775  
   data-arc span      15837 days (43.36 yr)  
   first obs. used      1976-09-24  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50142  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 22:36:11  

Additional Information
 Earth MOID = 1.64645 au 
 Jupiter MOID = 1.51167 au 
 T_jup = 3.181 
[ 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 13.0   n/a MPO347671  
diameter diameter 11.994 km 0.161 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 9.66 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:
[Chang, C.-K.; Ip, W.-H.; Cheng, Y.-C.; Ngeow, C.-C.; et al. (2014) Astrophys. J. 788, A17.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.072   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18852 (1999 RP91)          Discovered 1999-Sep-07 by LINEAR at Socorro
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 RP91 = 1976 SL1 = 1987 ON1 = 1998 LH3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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