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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1998986857727865 3.7598e-08  
a 2.355049510416062 8.8571e-09 au
q 1.884278208354047 8.7956e-08 au
i 1.792104359975788 3.2063e-06 deg
node 67.64139377340726 0.00013269 deg
peri 259.5074649135696 0.00013294 deg
M 279.1537729365652 1.0031e-05 deg
tp 2459496.952929135296
(2021-Oct-09.45292914)
3.7702e-05 TDB
period 1320.074644979636
3.61
7.447e-06
2.039e-08
d
yr
n .2727118510829011 1.5385e-09 deg/d
Q 2.825820812478077 1.0628e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1342  
   data-arc span      12677 days (34.71 yr)  
   first obs. used      1985-09-05  
   last obs. used      2020-05-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5295  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:35:43  

Additional Information
 Earth MOID = .871795 au 
 Jupiter MOID = 2.51503 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 15.22   n/a E2021B10  
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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