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18864 (1999 RQ195)
Classification: Main-belt Asteroid          SPK-ID: 2018864
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1093335257658413 3.7563e-08  
a 3.144878341467127 1.9902e-08 au
q 2.801037704289894 1.1575e-07 au
i 15.49860046984361 4.7762e-06 deg
node 203.1403790037427 1.3176e-05 deg
peri 234.9889416485473 2.6422e-05 deg
M 209.9728236374085 2.5622e-05 deg
tp 2460049.429520715280
(2023-Apr-14.92952072)
0.00014998 TDB
period 2037.061783519003
5.58
1.9337e-05
5.294e-08
d
yr
n .1767251258222045 1.6776e-09 deg/d
Q 3.48871897864436 2.2078e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1600  
   data-arc span      13462 days (36.86 yr)  
   first obs. used      1983-10-30  
   last obs. used      2020-09-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49855  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:40:11  

Additional Information
 Earth MOID = 1.8454 au 
 Jupiter MOID = 1.98212 au 
 T_jup = 3.144 
[ 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 13.16   n/a E2021B10  
diameter diameter 7.106 km 0.157 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 19.730 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 0.167   0.026 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18864 (1999 RQ195)          Discovered 1999-Sep-08 by LINEAR at Socorro
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 RQ195 = 1983 UP = 1994 UV1 = 1998 MS10 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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