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51 Nemausa (A858 BA)
Classification: Main-belt Asteroid          SPK-ID: 2000051
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 121 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06777107994999751 1.8559e-08  
a 2.364959451368455 2.4124e-09 au
q 2.204683595311261 4.421e-08 au
i 9.978931641233585 2.0596e-06 deg
node 175.9651777257236 1.5854e-05 deg
peri 2.252285270148142 2.6986e-05 deg
M 204.7830977615111 2.1807e-05 deg
tp 2459573.257106152882
(2021-Dec-24.75710615)
8.0501e-05 TDB
period 1328.41562511166
3.64
2.0326e-06
5.565e-09
d
yr
n .2709995224346599 4.1465e-10 deg/d
Q 2.525235307425649 2.5759e-09 au
  Orbit Determination Parameters
   # obs. used (total)      5602  
   data-arc span      57389 days (157.12 yr)  
   first obs. used      1863-09-12  
   last obs. used      2020-10-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46385  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:33:56  

Additional Information
 Earth MOID = 1.20845 au 
 Jupiter MOID = 2.43291 au 
 T_jup = 3.525 
[ 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 7.6   n/a MPO492748 IRAS observations used: 18
magnitude slope G 0.08   n/a PDS3 (MPC 17257) Fit
diameter diameter 138.159 km 0.966 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 7.783 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Chang, Y.C.; Chang, C.-s. (1963) Acta Astron. Sin. 11, 139-149.]
[Wamsteker, W.; Sather, R.E. (1974) Astron. J. 79, 1465-1470.]
[Gammelgaard, P.; Kristensen, L.K. (1983) Messenger 32, 29-30.]
[Kristensen, L.K.; Gammelgaard, P. (1985) Astron. Nachr. 306, 241-249.]
[Di Martino, M.; Zappala, V.; De Sanctis, G.; Cacciatori, S. (1987) Icarus 69, 338-353.]
[Gammelgaard, P.; Kristensen, L.K. (1991) Astron. Astrophys. 244, 544-552.]
[Kristensen, L.K. (1991) Astron. Nachr. 312, 209-220.]
[Kristensen, L.K. (1993) Astron. Nachr. 314, 381-390.]
[Kristensen, L.K.; Gammelgaard, P. (1993) Astron. Astrophys. 272, 345-354.]
[Kristensen, L.K.; Gammelgaard, P. (1997) Astron. Astrophys. 322, 679-686.]
[Lopez-Gonzalez, M.J.; Rodriguez, E. (2005) Planet. Space Sci. 53, 1147-1165.]
[Chiorny, V.G.; Shevchenko, V.G.; Krugly, Yu.N.; Velichko, F.P.; Gaftonyuk, N.M. (2007) Planet. Space Sci. 55, 986-997.]
[Behrend, R. (2008) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Garlitz, J. (2008) http://eoni.com/~garlitzj/Period.htm]
[Behrend, R. (2009) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2012) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2014) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
[Behrend, R. (2017) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Hanus, J.; Viikinkoski, M.; Marchis, F.; Durech, J.; et al (2017) Astron. Astrophys. 601, A114.]
geometric albedo albedo 0.100   0.025 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  
B-V BV 0.789   0.012 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=8; phase (min.=9.97, mean=15.82, max.=22.24) deg.
U-B UB 0.482   0.011 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=6; phase (min.=9.97, mean=13.87, max.=16.71) deg.
Tholen spectral type spec_T CU   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
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)

51 Nemausa (A858 BA)          Discovered 1858-Jan-22 by Laurent at Nimes
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A858 BA = 1949 HC1 = 1954 QX 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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