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20993 (1985 RX2)
Classification: Main-belt Asteroid          SPK-ID: 2020993
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1997728631932455 3.7674e-08  
a 2.355323351989449 8.9032e-09 au
q 1.884793662216605 8.8142e-08 au
i 1.792043710361339 3.2065e-06 deg
node 67.64360537285052 0.00013314 deg
peri 259.4793418323294 0.00013339 deg
M 224.6347917016752 9.8742e-06 deg
tp 2459496.953742430667
(2021-Oct-09.45374243)
3.7726e-05 TDB
period 1320.30489607906
3.61
7.4862e-06
2.05e-08
d
yr
n .2726642922169721 1.546e-09 deg/d
Q 2.825853041762294 1.0682e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1331  
   data-arc span      12677 days (34.71 yr)  
   first obs. used      1985-09-05  
   last obs. used      2020-05-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5302  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:59:33  

Additional Information
 Earth MOID = .874248 au 
 Jupiter MOID = 2.51489 au 
 T_jup = 3.527 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.2   n/a MPO309318  
diameter diameter 2.725 km 0.142 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.217   0.042 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20993 (1985 RX2)          Discovered 1985-Sep-05 by Debehogne, H. at La Silla
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1985 RX2 = 1999 JE47 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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