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19958 (1985 RN4)
Classification: Mars-crossing Asteroid          SPK-ID: 2019958
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 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3107709808334719 3.5048e-08  
a 2.38014495803864 6.8809e-09 au
q 1.640464974903129 8.363e-08 au
i 2.394641564498995 3.4578e-06 deg
node 53.2120379804767 9.4146e-05 deg
peri 288.8282778226443 9.4264e-05 deg
M 224.726271712789 4.8787e-06 deg
tp 2459704.481387074543
(2022-May-04.98138707)
1.9093e-05 TDB
period 1341.230863110531
3.67
5.8161e-06
1.592e-08
d
yr
n .2684101670350039 1.1639e-09 deg/d
Q 3.119824941174151 9.0192e-09 au
  Orbit Determination Parameters
   # obs. used (total)      836  
   data-arc span      12969 days (35.51 yr)  
   first obs. used      1985-09-11  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51013  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:10:14  

Additional Information
 Earth MOID = .632652 au 
 Jupiter MOID = 2.29613 au 
 T_jup = 3.471 
[ 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 16.14   n/a E2021B10  

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

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