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26840 (1991 RP12)
Classification: Main-belt Asteroid          SPK-ID: 2026840
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1602285299084824 3.3645e-08  
a 2.232841538528127 7.2269e-09 au
q 1.875076621291171 7.4322e-08 au
i 7.108865797102835 3.9348e-06 deg
node 345.0504370816363 2.7456e-05 deg
peri 330.3371771354569 3.0051e-05 deg
M 231.2368187693836 1.4355e-05 deg
tp 2459436.387563695727
(2021-Aug-09.88756370)
4.9866e-05 TDB
period 1218.667645756725
3.34
5.9166e-06
1.62e-08
d
yr
n .2954045766731256 1.4342e-09 deg/d
Q 2.590606455765083 8.3849e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1611  
   data-arc span      10489 days (28.72 yr)  
   first obs. used      1991-08-10  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50491  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 06:06:12  

Additional Information
 Earth MOID = .865637 au 
 Jupiter MOID = 2.70307 au 
 T_jup = 3.614 
[ 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 14.5   n/a MPO493025  
diameter diameter 3.250 km 0.149 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.319   0.023 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

26840 (1991 RP12)          Discovered 1991-Sep-04 by Elst, E. W. at La Silla
Reference: 20010804/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1991 RP12 = 2000 CO85 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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