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JPL Small-Body Database Browser
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9 Metis
Classification: Main-belt Asteroid          SPK-ID: 2000009
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 114 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1231142722068342 1.8445e-08  
a 2.385636535575458 3.1316e-09 au
q 2.091930629748052 4.429e-08 au
i 5.576815510839905 2.0095e-06 deg
node 68.9085766994347 2.425e-05 deg
peri 6.417369231417859 2.6101e-05 deg
M 276.8616226896404 1.0434e-05 deg
tp 2458911.316371234138
(2020-Mar-02.81637123)
3.922e-05 TDB
period 1345.875361826997
3.68
2.65e-06
7.255e-09
d
yr
n .2674839069134215 5.2668e-10 deg/d
Q 2.679342441402864 3.5171e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2649  
   data-arc span      61821 days (169.26 yr)  
   first obs. used      1849-07-31  
   last obs. used      2018-11-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43435  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-12 17:53:23  

Additional Information
 Earth MOID = 1.10691 au 
 Jupiter MOID = 2.55446 au 
 T_jup = 3.519 
[ 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 6.28   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. 2019-January); Warner et al., 2009 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.]
[Schober, H.J.; Surdej, J. (1979) Astron. Astrophys. Suppl. Ser. 38, 269-274.]
[Zappala, V.; van Houten-Groeneveld, I. (1979) Icarus 40, 289-296.]
[Zeigler, K.W.; Florence, W.B. (1985) Icarus 62, 512-517.]
[Di Martino, M.; Zappala, V.; De Sanctis, G.; Cacciatori, S. (1987) Icarus 69, 338-353.]
[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.]
[Lagerkvist, C.I.; Magnusson, P.; Williams, I.P.; Buontempo, M.E.; et al. (1988) Astron. Astrophys. Suppl. Ser. 73, 395-405.]
[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 Bull. 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/asteroids3D/web.php]
[Behrend, R. (2014) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2016) 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 0.118   n/a EAR-A-5-DDR-ALBEDOS-V1.0:TRIAD TRIAD quality code 3
B-V BV 0.858   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=23; phase (min.=2.98, mean=9.80, max.=26.91) deg.
U-B UB 0.496   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #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 | Mission Design | Physical Parameters | Discovery Circumstances ]
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