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9 Metis
Classification: Main-belt Asteroid          SPK-ID: 2000009
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 102 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .122290136725622 1.7607e-08  
a 2.386434727496142 3.0516e-09 AU
q 2.094597298383867 4.2156e-08 AU
i 5.574443681879504 1.9859e-06 deg
node 68.94475308525911 2.426e-05 deg
peri 5.868801515623646 2.6054e-05 deg
M 209.6856521000974 9.7644e-06 deg
tp 2457562.738658544770
(2016-Jun-23.23865854)
3.6745e-05 JED
period 1346.550877570938
3.69
2.5828e-06
7.071e-09
d
yr
n .2673497199373626 5.128e-10 deg/d
Q 2.678272156608418 3.4248e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      2390  
   data-arc span      60644 days (166.03 yr)  
   first obs. used      1849-07-31  
   last obs. used      2015-08-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .44495  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Sep-02 13:53:23  

Additional Information
 Earth MOID = 1.10928 AU 
 T_jup = 3.518 
[ 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 6.28 mag n/a PDS3 (MPC 17257)  
magnitude slope G 0.17   n/a PDS3 (MPC 17257) Fit
diameter diameter 190 km n/a Dunham Occult. list: Kristensen 1984b Yeomans E-mail 2001-Apr-04
rotation period rot_per 5.079 h n/a LCDB (Rev. 2015-July); Warner et al., 2009 Published Reference List:
[Zappala, V.; van Houten-Groeneveld, I. (1979) Icarus 40, 289-296.]
[Di Martino, M.; Zappala, V.; De Sanctis, G.; Cacciatori, S. (1987) Icarus 69, 338-353.]
[Harris, A.W.; Young, J.W. (1989) Icarus 81, 314-364.]
[Behrend, R. (2014) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.118   n/a EAR-A-5-DDR-ALBEDOS-V1.0:TRIAD TRIAD quality code 3
B-V BV .858 mag .020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=23; phase (min.=2.98, mean=9.80, max.=26.91) deg.
U-B UB .496 mag .030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=20; phase (min.=2.98, mean=10.36, max.=26.91) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo

9 Metis          Discovered 1848-Apr-25 by Graham, A. at Markree
Apr. 26 is date of first measurement.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1974 QU2 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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