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JPL Small-Body Database Browser
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489 Comacina (A902 RD)
Classification: Main-belt Asteroid          SPK-ID: 2000489
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 108 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04784545926696367 3.4346e-08  
a 3.149711410188625 1.3528e-08 au
q 2.999012021209754 1.0511e-07 au
i 12.99349662006554 3.6054e-06 deg
node 166.7028314128788 1.7673e-05 deg
peri 9.937705142498061 4.6128e-05 deg
M 171.1413650027741 4.2502e-05 deg
tp 2458029.862506200465
(2017-Oct-03.36250620)
0.00024091 TDB
period 2041.759441162388
5.59
1.3154e-05
3.601e-08
d
yr
n .1763185185983758 1.1359e-09 deg/d
Q 3.300410799167496 1.4175e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2790  
   data-arc span      42837 days (117.28 yr)  
   first obs. used      1902-09-03  
   last obs. used      2019-12-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44263  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:28:33  

Additional Information
 Earth MOID = 2.00483 au 
 Jupiter MOID = 1.66444 au 
 T_jup = 3.166 
[ 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 8.4   n/a MPO502157 IRAS observations used: 11
diameter diameter 139.39 km 3.0 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 11
rotation period rot_per 9.02 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R.; Greenberg, R.; et al. (1990) Icarus 86, 402-447.]
[Stephens, R.D.; Brincat, S.M.; Koff, R.A. (2001) Minor Planet Bull. 28, 73.]
[Durech, J. (2006) IAU 2006, poster paper.]
[Hawkins, S.; Ditteon, R. (2008) Minor Planet Bull. 35, 1-4.]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
geometric albedo albedo 0.0427   0.002 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 11
B-V BV 0.697   0.016 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=6.74, mean=7.53, max.=8.32) deg.
U-B UB 0.369   0.045 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=6.74, mean=7.53, max.=8.32) deg.
Tholen spectral type spec_T C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices

489 Comacina (A902 RD)          Discovered 1902-Sep-02 by Carnera, L. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 A902 RD = A911 DA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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