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20009 (1991 OY)
Classification: Main-belt Asteroid          SPK-ID: 2020009
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 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .208779079675956 2.7055e-08  
a 2.555267268258665 1.1625e-08 au
q 2.021780919665527 6.687e-08 au
i 8.636095358322123 2.9107e-06 deg
node 150.1724308261678 3.0325e-05 deg
peri 180.4531484335192 3.2727e-05 deg
M 59.4386117908393 1.2676e-05 deg
tp 2458954.168993302319
(2020-Apr-14.66899330)
5.2794e-05 TDB
period 1491.945382628072
4.08
1.0181e-05
2.787e-08
d
yr
n .2412956963383321 1.6466e-09 deg/d
Q 3.088753616851803 1.4052e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1967  
   data-arc span      12247 days (33.53 yr)  
   first obs. used      1987-09-01  
   last obs. used      2021-03-13  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4566  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:11:20  

Additional Information
 Earth MOID = 1.00907 au 
 Jupiter MOID = 2.28233 au 
 T_jup = 3.391 
[ 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 14.28   n/a E2021B10  
rotation period rot_per 2.97 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:
[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.]

20009 (1991 OY)          Discovered 1991-Jul-18 by Holt, H. E. at Palomar
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1991 OY = 1987 RM2 = 1999 NS46 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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