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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 98 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1222901372072322 1.7637e-08  
a 2.386434727641735 3.0639e-09 AU
q 2.094597297362323 4.2217e-08 AU
i 5.574443831744537 1.9897e-06 deg
node 68.94475295406656 2.4268e-05 deg
peri 5.868801508667977 2.6061e-05 deg
M 209.685652098233 9.7665e-06 deg
tp 2457562.738658603195
(2016-Jun-23.23865860)
3.6755e-05 JED
period 1346.550877694164
3.69
2.5932e-06
7.1e-09
d
yr
n .2673497199128967 5.1487e-10 deg/d
Q 2.678272157921147 3.4386e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      2362  
   data-arc span      60290 days (165.07 yr)  
   first obs. used      1849-07-31  
   last obs. used      2014-08-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .4463  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Sep-12 13:33:11  

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 Asteroid Lightcurve DataBase (Rev. 2014-Mar-01) Published Reference List:
[Groeneveld, I.; Kuiper, G.P. (1954) Astrophys. J. 120, 200-220.]
[Groeneveld, I.; Kuiper, G.P. (1954) Astrophys. J. 120, 529-546.]
[Yang, X.-y.; Zhang, Y.-y.; Li, X.-q. (1965) Acta Astron. Sin. 13, 66-74.]
[Zappala, V.; van Houten-Groeneveld, I. (1979) Icarus 40, 289-296.]
[Schober, H.J.; Surdej, J. (1979) Astron. Astrophys. Suppl. Ser. 38, 269-274.]
[Zeigler, K.W.; Florence, W.B. (1985) Icarus 62, 512-517.]
[Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R.; Greenberg, R.; et al. (1987) Icarus 70, 191-245.]
[Di Martino, M.; Zappala, V.; De Sanctis, G.; Cacciatori, S. (1987) Icarus 69, 338-353.]
[Lagerkvist, C.I.; Magnusson, P.; Williams, I.P.; Buontempo, M.E.; et al. (1988) Astron. Astrophys. Suppl. Ser. 73, 395-405.]
[Drummond, J.D.; Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R. (1988) Icarus 76, 19-77.]
[Harris, A.W.; Young, J.W. (1989) Icarus 81, 314-364.]
[Magnusson, P. (1990) Icarus 85, 229-240.]
[Drummond, J.D.; Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R. (1991) Icarus 89, 44-64.]
[Richmond, E.H.; Neely, A.W. (1994) Minor Planet Bul. 21, 23-24.]
[De Angelis, G. (1995) Planet. Space Sci. 43, 649-682.]
[Torppa, J.; Kaasalainen, M.; Michalowski, T.; Kwiatkowski, T.; et al. (2003) Icarus 164, 346-383.]
[Durech, J.; Kaasalainen, M.; Herald, D.; Dunham, D.; et al. (2011) Icarus 214, 652-670.]
[Durech, J. (2011) Database of Asteroid Models from Inversion Techniques (DAMIT). http://astro.troja.mff.cuni.cz/projects/aster oids3D/web.php]
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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