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21 Lutetia
Classification: Main-belt Asteroid          SPK-ID: 2000021
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 86 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1645949090514331 2.5867e-08  
a 2.434518499704526 3.842e-09 AU
q 2.033809148661628 6.3586e-08 AU
i 3.06380267841639 3.6478e-06 deg
node 80.88541515901653 5.9563e-05 deg
peri 250.1630425993545 6.0424e-05 deg
M 289.0152011822495 1.2611e-05 deg
tp 2457274.077830045685
4.8892e-05 JED
period 1387.452249731795
n .2594683889622802 6.1421e-10 deg/d
Q 2.835227850747424 4.4744e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      3862  
   data-arc span      54208 days (148.41 yr)  
   first obs. used      1866-04-06  
   last obs. used      2014-09-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .39704  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Sep-12 13:33:12  

Additional Information
 Earth MOID = 1.02613 AU 
 T_jup = 3.485 
[ 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 7.35 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 15
magnitude slope G 0.11   n/a PDS3 (MPC 17257) Fit
diameter diameter 95.76 km 4.1 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 15
rotation period rot_per 8.1655 h n/a Asteroid Lightcurve DataBase (Rev. 2014-Mar-01) Published Reference List:
[Lupishko, D.F.; Bel'skaya, I.N.; Tupieva, F.A. (1983) Pis'ma Astron. Zh. 9, 691-694; Sov. Astron. Lett. 9, 358-360.]
[Zappala, V.; Di Martino, M.; Knezevic, Z.; Djurasevic, G. (1984) Astron. Astrophys. 130, 208-210.]
[Lupishko, D.F.; Velichko, F.P. (1987) Kin. Fiz. Neb. Tel 3(1), 57-65; Kinematics and Physics of Celestial Bodies 3(1), 63-71.]
[Michalowski, T. (1992) in Asteroids, Comets, Meteors 1991. A.W. Harris, E. Bowell, eds. Lunar and Planetary Institute, Houston, pp. 417-419.]
[Michalowski, T. (1993) Icarus 106, 563-572.]
[De Angelis, G. (1995) Planet. Space Sci. 43, 649-682.]
[Lagerkvist, C.-I.; Erikson, A.; Debehogne, H.; Festin, L.; et al. (1995) Astron. Astrophys. Suppl. Ser. 113, 115-129.]
[Michalowski, T. (1996) Icarus 123, 456-462.]
[Szabo, Gy.; Sarneczky, K.; Kiss, L.L. (1999) in Proc. IAU Coll. 173, Evolution and Source Regions of Asteroids and Comets, 185-188.]
[Torppa, J.; Kaasalainen, M.; Michalowski, T.; Kwiatkowski, T.; et al. (2003) Icarus 164, 346-383.]
[Behrend, R. (2003) Observatoire de Geneve web site,]
[Faury, G. (2009) Bul. Amer. Astron. Soc. 40.]
[Belskaya, I.N.; Fornasier, S.; Krugly, Yu.N.; Shevchenko, V.G.; et al. (2010) Astron. Astrophys. 515, A29.]
[Carry, B.; Kaasalainen, M.; Leyrat, C.; Merline, W.J.; et al. (2010) Astron. Astrophys. 523, A94.]
[Behrend, R. (2010) Observatoire de Geneve web site,]
geometric albedo albedo 0.2212   0.020 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 15
B-V BV .686 mag .027 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=17; phase (min.=3.08, mean=16.43, max.=25.04) deg.
U-B UB .189 mag .017 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=11; phase (min.=3.08, mean=13.14, max.=23.99) deg.
Tholen spectral type spec_T M   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B Xk   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)

21 Lutetia          Discovered 1852-Nov-15 by Goldschmidt, H. at Paris
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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