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19958 (1985 RN4)
Classification: Mars-crossing Asteroid          SPK-ID: 2019958
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 7 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3122503748619622 5.4583e-08  
a 2.379598523968224 1.8548e-08 AU
q 1.636567992838174 1.3439e-07 AU
i 2.395017419257717 7.4095e-06 deg
node 53.26059581175686 0.000147 deg
peri 288.537957784916 0.00014755 deg
M 354.7503557284447 1.4657e-05 deg
tp 2457020.051556530061
(2014-Dec-28.55155653)
5.4756e-05 JED
period 1340.769009618383
3.67
1.5677e-05
4.292e-08
d
yr
n .2685026260432923 3.1394e-09 deg/d
Q 3.122629055098273 2.434e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      339  
   data-arc span      10572 days (28.94 yr)  
   first obs. used      1985-09-11  
   last obs. used      2014-08-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .52832  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Sep-12 14:12:36  

Additional Information
 Earth MOID = .630966 AU 
 T_jup = 3.470 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 16.0 mag n/a MPO259485  

19958 (1985 RN4)          Discovered 1985-Sep-11 by Debehogne, H. at La Silla (809)
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1985 RN4 = 1996 TO38 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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