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85 Io
Classification: Main-belt Asteroid          SPK-ID: 2000085
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 83 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1934735702641898 2.4734e-08  
a 2.653167226851524 4.8698e-09 AU
q 2.13984949096462 6.5474e-08 AU
i 11.95778331104985 3.1265e-06 deg
node 203.1293350910609 1.5222e-05 deg
peri 123.1002827349115 1.6784e-05 deg
M 215.5518334713854 8.1411e-06 deg
tp 2457633.866218491015
(2016-Sep-02.36621849)
3.6242e-05 JED
period 1578.502823098119
4.32
4.3459e-06
1.19e-08
d
yr
n .2280642104227789 6.279e-10 deg/d
Q 3.166484962738427 5.8119e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      1766  
   data-arc span      54608 days (149.51 yr)  
   first obs. used      1865-09-21  
   last obs. used      2015-03-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .57574  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Apr-07 15:58:15  

Additional Information
 Earth MOID = 1.15673 AU 
 T_jup = 3.332 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 7.61 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 8
diameter diameter 154.79 km 3.8 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 8
rotation period rot_per 6.875 h n/a LCDB (Rev. 2015-Feb); Warner et al., 2009 Published Reference List:
[Yang, X.-y.; Zhang, Y.-y.; Li, X.-q. (1965) Acta Astron. Sin. 13, 66-74.]
[Lagerkvist, C.-I.; Schober, H.J. (1981) Astron. Astrophys. Suppl. Ser. 44, 401-404.]
[Erikson, A.; Berthier, J.; Denchev, P.V.; Harris, A.W.; et al. (1999) Planet. Space Sci. 47, 327-330.]
[Torppa, J.; Kaasalainen, M.; Michalowski, T.; Kwiatkowski, T.; et al. (2003) Icarus 164, 346-383.]
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Durech, J.; Kaasalainen, M.; Herald, D.; Dunham, D.; et al. (2011) Icarus 214, 652-670.]
[Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Hanus, J.; Marchis, F.; Durech, J. (2013) Icarus 226, 1045-1057.]
geometric albedo albedo 0.0666   0.003 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 8
B-V BV .668 mag .023 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=8; phase (min.=6.05, mean=11.20, max.=19.29) deg.
U-B UB .294 mag .015 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=7; phase (min.=6.05, mean=10.95, max.=19.29) deg.
Tholen spectral type spec_T FC   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B B   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)

85 Io          Discovered 1865-Sep-19 by Peters, C. H. F. at Clinton
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A899 LA = A899 UA 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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