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20601 (1999 RD197)
Classification: Main-belt Asteroid          SPK-ID: 2020601
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 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2966695561886762 4.1096e-08  
a 2.637096851278533 1.3249e-08 au
q 1.854750498783175 1.1388e-07 au
i 6.712003328432942 4.2411e-06 deg
node 312.2459047630412 2.9372e-05 deg
peri .5428587445049371 2.9991e-05 deg
M 7.653279036977895 5.3219e-06 deg
tp 2459167.246865090105
(2020-Nov-13.74686509)
2.305e-05 TDB
period 1564.182948213702
4.28
1.1788e-05
3.227e-08
d
yr
n .2301521061913636 1.7344e-09 deg/d
Q 3.419443203773891 1.7179e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1630  
   data-arc span      12535 days (34.32 yr)  
   first obs. used      1986-08-12  
   last obs. used      2020-12-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51513  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:24:50  

Additional Information
 Earth MOID = .838693 au 
 Jupiter MOID = 1.88448 au 
 T_jup = 3.324 
[ 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 13.91   n/a E2021B10  
rotation period rot_per 3.343 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:
[Polishook, D.; Ofek, E.O.; Waszczak, A.; Kulkarni, S.R.; et al. (2012). Mon. Not. Royal Ast. Soc. 421, 2094-2108.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]

20601 (1999 RD197)          Discovered 1999-Sep-08 by LINEAR at Socorro
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 RD197 = 1986 PN1 = 2000 AU145 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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