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JPL Small-Body Database Browser
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55 Pandora (A858 RB)
Classification: Main-belt Asteroid          SPK-ID: 2000055
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 73 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .143246421966522 3.0173e-08  
a 2.760437589496736 5.7313e-09 au
q 2.365014781739438 8.3934e-08 au
i 7.179404189990017 3.5583e-06 deg
node 10.36964233422475 2.8919e-05 deg
peri 5.385958668060082 3.1777e-05 deg
M 86.99154514989542 1.3955e-05 deg
tp 2458595.700590811001
6.4604e-05 TDB
period 1675.194837118199
n .2149003757791542 6.6927e-10 deg/d
Q 3.155860397254035 6.5523e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2664  
   data-arc span      38899 days (106.50 yr)  
   first obs. used      1913-10-24  
   last obs. used      2020-04-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .34422  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 00:57:14  

Additional Information
 Earth MOID = 1.36622 au 
 Jupiter MOID = 2.31081 au 
 T_jup = 3.315 
[ 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 7.7   n/a MPO234839  
diameter diameter 84.794 km 2.501 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 4.8040 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Schober, H.J. (1978) Astron. Astrophys. Suppl. Ser. 34, 377-381.]
[Barucci, M.A.; Fulchignoni, M.; Burchi, R.; D'Ambrosio, V. (1985) Icarus 61, 152-162.]
[Di Martino, M.; Zappala, V.; De Sanctis, G.; Cacciatori, S. (1987) Icarus 69, 338-353.]
[Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R.; Greenberg, R.; et al. (1987) Icarus 70, 191-245.]
[Drummond, J.D.; Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R. (1988) Icarus 76, 19-77.]
[Drummond, J.D.; Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R. (1991) Icarus 89, 44-64.]
[Michalowski, T. (1993) Icarus 106, 563-572.]
[De Angelis, G. (1995) Planet. Space Sci. 43, 649-682.]
[Lagerkvist, C.-I.; Erikson, A.; Debehogne, H.; Festin, L.; et al. (1995) Astron. Astrophys. Suppl. Ser. 113, 115-129.]
[Michalowski, T. (1996) Icarus 123, 456-462.]
[Torppa, J.; Kaasalainen, M.; Michalowski, T.; Kwiatkowski, T.; et al. (2003) Icarus 164, 346-383.]
[Behrend, R. (2007) Observatoire de Geneve web site,]
[Durech, J.; Kaasalainen, M.; Herald, D.; Dunham, D.; et al. (2011) Icarus 214, 652-670.]
[Hamanowa, H.; Hamanowa, H. (2011)]
geometric albedo albedo 0.204   0.033 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
B-V BV 0.704   0.024 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=7; phase (min.=2.83, mean=10.78, max.=19.01) deg.
U-B UB 0.242   0.023 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=3.79, mean=6.51, max.=11.04) deg.
Tholen spectral type spec_T M   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
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)

55 Pandora (A858 RB)          Discovered 1858-Sep-10 by Searle, G. at Albany
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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