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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1615420431687714 3.184e-08  
a 3.174643667830856 1.6456e-08 au
q 2.661805243396657 1.0649e-07 au
i 1.441198513788662 3.4618e-06 deg
node 56.71863815205892 0.0001397 deg
peri 236.4092095338203 0.00014015 deg
M 354.3171035408578 1.218e-05 deg
tp 2459429.114306490262
(2021-Aug-02.61430649)
6.9985e-05 TDB
period 2066.050370776314
5.66
1.6065e-05
4.398e-08
d
yr
n .1742455097378534 1.3548e-09 deg/d
Q 3.687482092265054 1.9115e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2172  
   data-arc span      16389 days (44.87 yr)  
   first obs. used      1976-09-24  
   last obs. used      2021-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46914  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:14:44  

Additional Information
 Earth MOID = 1.64564 au 
 Jupiter MOID = 1.50703 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 13.04   n/a MPO636348  
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. 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:
[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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