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JPL Small-Body Database Browser
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494 Virtus (A902 TF)
Classification: Main-belt Asteroid          SPK-ID: 2000494
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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06460148081636216 3.6463e-08  
a 2.986421418141444 1.09e-08 au
q 2.793494172187806 1.1209e-07 au
i 7.084995474823764 4.1265e-06 deg
node 38.21260841694365 2.8468e-05 deg
peri 217.7224888285327 4.0433e-05 deg
M 334.7746172885587 2.8846e-05 deg
tp 2458732.587076341480
(2019-Sep-06.08707634)
0.00015109 TDB
period 1885.059506406026
5.16
1.032e-05
2.825e-08
d
yr
n .1909754035756465 1.0455e-09 deg/d
Q 3.179348664095081 1.1604e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3077  
   data-arc span      42686 days (116.87 yr)  
   first obs. used      1902-10-07  
   last obs. used      2019-08-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4441  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-23 19:09:14  

Additional Information
 Earth MOID = 1.78295 au 
 Jupiter MOID = 1.84445 au 
 T_jup = 3.243 
[ 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 9.1   n/a MPO492755 IRAS observations used: 18
diameter diameter 100.786 km 0.731 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 5.57 h n/a LCDB (Rev. 2019-January); 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:
[Warner, B.D. (2006) Minor Planet Bull. 33, 58-62.]
[Hamanowa, H.; Hamanowa, H. (2009) Minor Planet Bull. 36, 87-88.]
geometric albedo albedo 0.065   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.728   0.028 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=6.13, mean=9.45, max.=14.73) deg.
U-B UB 0.373   0.046 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=6.13, mean=9.45, max.=14.73) deg.
Tholen spectral type spec_T C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices
SMASSII spectral type spec_B Ch   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

494 Virtus (A902 TF)          Discovered 1902-Oct-07 by Wolf, M. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 A902 TF = 1950 BM 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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