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117 Lomia (A871 RB)
Classification: Main-belt Asteroid          SPK-ID: 2000117
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 99 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02676966849471715 3.9835e-08  
a 2.992997487221973 9.0019e-09 au
q 2.91287593668352 1.1839e-07 au
i 14.89920774485396 4.5286e-06 deg
node 348.7370961242506 1.5514e-05 deg
peri 50.36193303661402 8.7977e-05 deg
M 226.3618933738293 8.6682e-05 deg
tp 2459702.578653125231
0.0004566 TDB
period 1891.289255033391
n .1903463465685709 8.5874e-10 deg/d
Q 3.073119037760427 9.2429e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2568  
   data-arc span      46586 days (127.55 yr)  
   first obs. used      1892-10-10  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41997  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 00:58:47  

Additional Information
 Earth MOID = 1.92831 au 
 Jupiter MOID = 2.03511 au 
 T_jup = 3.204 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 8.0   n/a MPO473761 IRAS observations used: 12
diameter diameter 208.974 km 1.208 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 9.127 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Di Martino, M.; Dotto, E.; Celino, A.; Barucci, M.A.; Fulchignoni, M. (1995) Astron. Astrophys. Suppl. Ser. 112, 1-7.]
[Behrend, R. (2003) Observatoire de Geneve web site,]
[Behrend, R. (2006) Observatoire de Geneve web site,]
[Behrend, R. (2013) Observatoire de Geneve web site,]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
geometric albedo albedo 0.027   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
B-V BV 0.687   0.017 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=7; phase (min.=6.21, mean=12.03, max.=17.45) deg.
U-B UB 0.306   0.033 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=7; phase (min.=6.32, mean=12.86, max.=17.45) deg.
Tholen spectral type spec_T XC   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices
SMASSII spectral type spec_B X   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)

117 Lomia (A871 RB)          Discovered 1871-Sep-12 by Borrelly, A. at Marseille
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A871 RB = A900 DA = A900 MC 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
FirstGov 2020-Jun-01 23:52 UT
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