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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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 118 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04792506107019115 1.4521e-08  
a 3.14988098425697 1.0448e-08 au
q 2.998922745722621 4.9632e-08 au
i 12.99361365584152 1.0676e-06 deg
node 166.7016765310158 5.3397e-06 deg
peri 9.546108970206795 2.6258e-05 deg
M 241.3928814977847 2.9461e-05 deg
tp 2460069.241002611590
(2023-May-04.74100261)
0.00016849 TDB
period 2041.924329656901
5.59
1.016e-05
2.782e-08
d
yr
n .176304280609894 8.7721e-10 deg/d
Q 3.300839222791319 1.0949e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3385  
   data-arc span      43426 days (118.89 yr)  
   first obs. used      1902-09-03  
   last obs. used      2021-07-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4089  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 06:40:47  

Additional Information
 Earth MOID = 2.00556 au 
 Jupiter MOID = 1.66232 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 8.51   n/a E2021B10 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. 2020-October); 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

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