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87 Sylvia (A866 KA)
Classification: Outer Main-belt Asteroid          SPK-ID: 2000087
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 89 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09340361555726787 2.9866e-08  
a 3.482070736389678 1.2499e-08 au
q 3.156832739984724 1.0433e-07 au
i 10.8759859239203 3.6489e-06 deg
node 73.04063802169436 1.769e-05 deg
peri 263.5897265413481 2.8005e-05 deg
M 153.4227031588239 2.3231e-05 deg
tp 2457989.055771847820
(2017-Aug-23.55577185)
0.00015164 TDB
period 2373.311867395833
6.50
1.2778e-05
3.498e-08
d
yr
n .1516867652100934 8.1672e-10 deg/d
Q 3.807308732794632 1.3666e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3890  
   data-arc span      45869 days (125.58 yr)  
   first obs. used      1894-11-02  
   last obs. used      2020-06-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39304  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:06:52  

Additional Information
 Earth MOID = 2.17294 au 
 Jupiter MOID = 1.57259 au 
 T_jup = 3.094 
[ 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 6.8   n/a MPO502153 IRAS observations used: 20
diameter diameter 253.051 km 2.953 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 5.184 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Schober, H.J.; Surdej, J. (1979) Astron. Astrophys. Suppl. Ser. 38, 269-274.]
[Harris, A.W.; Young, J.W. (1980) Icarus 43, 20-32.]
[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.]
[Magnusson, P. (1990) Icarus 85, 229-240.]
[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.]
[Foerster, I.; Potthoff, H. (2001) Minor Planet Bull. 28, 25-26.]
[Kaasalainen, M.; Torppa, J.; Piironen, J. (2002) Icarus 159, 369-395.]
[Marchis, F.; Kaasalainen, M.; Hom, E.F.Y.; Berthier, J.; et al. (2006) Icarus 185, 39-63.]
[Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Vereshchagina, I.A.; Gorshanov, D.L.; Devyatkin, A.V.; Papushev, P.G. (2009) Solar System Research 43, 291-300.]
[Hamanowa, H.; Hamanowa, H. (2011) http://www2.ocn.ne.jp/~hamaten/astlcdata.htm]
[Behrend, R. (2012) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Hanus, J.; Marchis, F.; Durech, J. (2013) Icarus 226, 1045-1057.]
[Behrend, R. (2015) 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.]
[Hanus, J.; Viikinkoski, M.; Marchis, F.; Durech, J.; et al (2017) Astron. Astrophys. 601, A114.]
geometric albedo albedo 0.046   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.710   0.015 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=19; phase (min.=3.98, mean=10.21, max.=17.32) deg.
U-B UB 0.251   0.026 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=9; phase (min.=5.07, mean=8.15, max.=15.60) deg.
Tholen spectral type spec_T P   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)

87 Sylvia (A866 KA)          Discovered 1866-May-16 by Pogson, N. R. at Madras
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A866 KA = A909 GA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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