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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1994414068337404 3.7996e-08  
a 2.355927418123127 9.2848e-09 au
q 1.886057939454469 8.8674e-08 au
i 1.792124134971715 3.5359e-06 deg
node 67.65174389694845 0.00013368 deg
peri 259.4576107465711 0.00013398 deg
M 115.6157925914346 9.7781e-06 deg
tp 2458176.314375224240
(2018-Feb-26.81437522)
3.5005e-05 TDB
period 1320.812853473332
3.62
7.8081e-06
2.138e-08
d
yr
n .2725594311512873 1.6113e-09 deg/d
Q 2.825796896791785 1.1137e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1218  
   data-arc span      12209 days (33.43 yr)  
   first obs. used      1985-09-05  
   last obs. used      2019-02-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53762  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-12 23:48:10  

Additional Information
 Earth MOID = .874617 au 
 Jupiter MOID = 2.51193 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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