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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02901358041695063 3.639e-08  
a 2.179175419264804 6.8388e-09 au
q 2.115949737995322 8.1045e-08 au
i .9516778970003494 3.1611e-06 deg
node 269.9835634059399 0.00021152 deg
peri 247.1282705036869 0.00021742 deg
M 35.25485673523819 5.0506e-05 deg
tp 2459085.432370181588
(2020-Aug-23.93237018)
0.00016479 TDB
period 1174.996881868578
3.22
5.5312e-06
1.514e-08
d
yr
n .3063837917829176 1.4423e-09 deg/d
Q 2.242401100534286 7.0372e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1674  
   data-arc span      11061 days (30.28 yr)  
   first obs. used      1990-11-23  
   last obs. used      2021-03-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49787  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:23:52  

Additional Information
 Earth MOID = 1.1238 au 
 Jupiter MOID = 2.72418 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 14.82   n/a E2021B10  
rotation period rot_per 4.550 h n/a LCDB (Rev. 2020-October); 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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