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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .161038840445199 3.2656e-08  
a 3.173245764638597 1.8637e-08 au
q 2.662229946253558 1.1008e-07 au
i 1.441316652736087 3.6761e-06 deg
node 56.72223992635569 0.00014619 deg
peri 236.4012418442991 0.00014672 deg
M 285.2589740426428 1.3706e-05 deg
tp 2459429.157616455248
(2021-Aug-02.65761646)
8.0244e-05 TDB
period 2064.685893018559
5.65
1.8189e-05
4.98e-08
d
yr
n .1743606624219639 1.5361e-09 deg/d
Q 3.684261583023635 2.1638e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1913  
   data-arc span      15923 days (43.59 yr)  
   first obs. used      1976-09-24  
   last obs. used      2020-04-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48873  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 04:54:09  

Additional Information
 Earth MOID = 1.64645 au 
 Jupiter MOID = 1.51167 au 
 T_jup = 3.181 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456869.5 (2014-Jul-31.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1593490978088175 3.2663e-08  
q 2.66862523199208 1.0997e-07 au
tp 2457362.317772027848
(2015-Dec-05.81777203)
7.4639e-05 TDB
node 56.74533863329174 0.00014609 deg
peri 236.3374458634368 0.00014662 deg
i 1.441804771203614 3.6758e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1913  
   data-arc span      15923 days (43.59 yr)  
   first obs. used      1976-09-24  
   last obs. used      2020-04-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48873  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 04:54:09  

Additional Information
 Jupiter MOID = 1.51167 au 
 T_jup = 3.181 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.06690049728582E-15 -3.559867407622464E-15 -2.802373830235023E-13 3.61179694506463E-15 -1.209096576209576E-14 3.766342338856036E-17
q -3.559867407622464E-15 1.209300498434214E-14 1.172031098195074E-12 -2.048543840884622E-14 7.969672886084637E-14 2.875487414633309E-17
tp -2.802373830235023E-13 1.172031098195074E-12 5.571040538260377E-9 -3.702835035373106E-12 9.465180386904684E-10 4.154173759606522E-13
node 3.61179694506463E-15 -2.048543840884622E-14 -3.702835035373106E-12 2.13422443412002E-8 -2.133609643829473E-8 -9.422639644531586E-11
peri -1.209096576209576E-14 7.969672886084637E-14 9.465180386904684E-10 -2.133609643829473E-8 2.149835879384526E-8 9.427092525355318E-11
i 3.766342338856036E-17 2.875487414633309E-17 4.154173759606522E-13 -9.422639644531586E-11 9.427092525355318E-11 1.351176085350921E-11

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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