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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1607347804505785 3.4912e-08  
a 3.174460269525765 2.0584e-08 au
q 2.664214095054457 1.147e-07 au
i 1.441224529682224 4.1084e-06 deg
node 56.73246543220943 0.00015651 deg
peri 236.2730571197693 0.00015701 deg
M 215.6403181630102 1.3538e-05 deg
tp 2459428.912581794656
(2021-Aug-02.41258179)
8.0898e-05 TDB
period 2065.871340606266
5.66
2.0093e-05
5.501e-08
d
yr
n .1742606100021464 1.6949e-09 deg/d
Q 3.684706443997073 2.3893e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1717  
   data-arc span      15580 days (42.66 yr)  
   first obs. used      1976-09-24  
   last obs. used      2019-05-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5041  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-12 22:47:49  

Additional Information
 Earth MOID = 1.64774 au 
 Jupiter MOID = 1.50904 au 
 T_jup = 3.180 
[ 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-January); 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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