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101961 (1999 RL39)
Classification: Mars-crossing Asteroid          SPK-ID: 2101961
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2424855917745401 5.2577e-08  
a 2.182171554695212 7.9738e-09 au
q 1.653026393901376 1.1355e-07 au
i 7.633145106783314 4.4489e-06 deg
node 87.96917987281293 3.8198e-05 deg
peri 252.1623215918061 3.9258e-05 deg
M 237.4565075217633 1.3255e-05 deg
tp 2459601.292434545269
(2022-Jan-21.79243455)
4.4896e-05 TDB
period 1177.420959027436
3.22
6.4536e-06
1.767e-08
d
yr
n .3057530080807839 1.6759e-09 deg/d
Q 2.711316715489049 9.9074e-09 au
  Orbit Determination Parameters
   # obs. used (total)      682  
   data-arc span      7825 days (21.42 yr)  
   first obs. used      1999-09-08  
   last obs. used      2021-02-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .57649  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 15:39:38  

Additional Information
 Earth MOID = .662089 au 
 Jupiter MOID = 2.71106 au 
 T_jup = 3.630 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.95   n/a E2021B55  

101961 (1999 RL39)          Discovered 1999-Sep-08 by CSS at Catalina
Reference: 20051019/Numbers.arcLast Updated: 2005-10-26

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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