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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 105 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04723935071741169 3.4919e-08  
a 3.152963475297802 1.4308e-08 au
q 3.00401952788902 1.0791e-07 au
i 12.98545649160588 3.6607e-06 deg
node 166.734408858647 1.8126e-05 deg
peri 10.97740007730036 4.7352e-05 deg
M 99.57222507620708 4.3414e-05 deg
tp 2458034.895901314358
(2017-Oct-08.39590131)
0.00024675 TDB
period 2044.922420594635
5.60
1.392e-05
3.811e-08
d
yr
n .1760457983023713 1.1983e-09 deg/d
Q 3.301907422706584 1.4984e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2572  
   data-arc span      42722 days (116.97 yr)  
   first obs. used      1902-09-03  
   last obs. used      2019-08-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45944  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-23 19:09:08  

Additional Information
 Earth MOID = 2.01025 au 
 Jupiter MOID = 1.66427 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 8.32   n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 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-January); 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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