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20561 (1999 RE120)
Classification: Main-belt Asteroid          SPK-ID: 2020561
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02932086480001493 4.2623e-08  
a 2.179167533669501 7.3185e-09 au
q 2.115272457038195 9.3421e-08 au
i .9516955694553568 3.6013e-06 deg
node 269.9901326480803 0.00024134 deg
peri 247.5488014769891 0.00024728 deg
M 211.0406993643383 5.4448e-05 deg
tp 2459086.682677060655
(2020-Aug-25.18267706)
0.00017784 TDB
period 1174.990504083594
3.22
5.9191e-06
1.621e-08
d
yr
n .3063854548175888 1.5434e-09 deg/d
Q 2.243062610300806 7.5331e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1529  
   data-arc span      10603 days (29.03 yr)  
   first obs. used      1990-11-23  
   last obs. used      2019-12-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50207  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 00:44:47  

Additional Information
 Earth MOID = 1.12385 au 
 Jupiter MOID = 2.72576 au 
 T_jup = 3.681 
[ 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 14.8   n/a MPO406067  
rotation period rot_per 4.550 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Clark, M. (2014) Minor Planet Bull. 41, 178-183.]
[Chang, C.K.; Ip, W.-H.; Lin, H.-W.; Cheng, Y.C.; et al. (2015) Astrophys. J. Supp. Ser. 219, A27.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]

20561 (1999 RE120)          Discovered 1999-Sep-09 by LINEAR at Socorro
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 RE120 = 1990 WL15 = 1998 FV19 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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