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399307 (1991 RJ2)
Classification: Amor [NEO]          SPK-ID: 2399307
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 62 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .427746895040474 5.2264e-08  
a 2.209254122512835 4.7983e-09 au
q 1.264252531252603 1.1552e-07 au
i 8.946966361623488 7.5079e-06 deg
node 171.775641215049 1.6356e-05 deg
peri 150.9556420453053 2.3188e-05 deg
M 337.1649242850706 7.9233e-06 deg
tp 2459276.579367464530
(2021-Mar-03.07936746)
2.6478e-05 TDB
period 1199.407990984867
3.28
3.9075e-06
1.07e-08
d
yr
n .3001480753053796 9.7784e-10 deg/d
Q 3.154255713773066 6.8507e-09 au
  Orbit Determination Parameters
   # obs. used (total)      217  
   data-arc span      10424 days (28.54 yr)  
   first obs. used      1991-09-08  
   last obs. used      2020-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42373  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-14 11:54:41  

Additional Information
 Earth MOID = .262642 au 
 Jupiter MOID = 2.23616 au 
 T_jup = 3.519 
[ 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 18.89   n/a E2021B25  
rotation period rot_per 3.4807 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Warner, B.D.; Pollock, J.T.; Reichart, D.E.; Haislip, J.B.; LaCluyze, A.P.; Verveer, A.; Spuck, T.; Harris, A.W. (2015) Minor Planet Bull. 42, 37-38.]

399307 (1991 RJ2)          Discovered 1991-Sep-08 by Helin, E. F. at Palomar
Reference: Last Updated: 2014-07-14

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