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20538 (1999 RN84)
Classification: Main-belt Asteroid          SPK-ID: 2020538
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 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2271790112778694 2.5093e-08  
a 2.30599668624901 4.9543e-09 au
q 1.782122639056916 5.6749e-08 au
i 2.55080740107995 2.3835e-06 deg
node 257.9149959189717 8.2662e-05 deg
peri 30.69328279482336 8.3081e-05 deg
M 69.66804112078523 8.5511e-06 deg
tp 2458952.975869321036
(2020-Apr-13.47586932)
3.0289e-05 TDB
period 1279.046828515491
3.50
4.122e-06
1.129e-08
d
yr
n .281459593170509 9.0705e-10 deg/d
Q 2.829870733441103 6.0798e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2490  
   data-arc span      14497 days (39.69 yr)  
   first obs. used      1981-05-05  
   last obs. used      2021-01-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46004  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:23:31  

Additional Information
 Earth MOID = .76443 au 
 Jupiter MOID = 2.34826 au 
 T_jup = 3.552 
[ 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 14.59   n/a E2021B10  
rotation period rot_per 5.784 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]

20538 (1999 RN84)          Discovered 1999-Sep-07 by LINEAR at Socorro
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 RN84 = 1981 JP2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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