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21 Lutetia (A852 VA)
Classification: Main-belt Asteroid          SPK-ID: 2000021
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 118 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1634719633486091 2.0597e-08  
a 2.435526258026195 2.6519e-09 au
q 2.037385998839562 5.0545e-08 au
i 3.063596780034996 3.2198e-07 deg
node 80.86040163763911 7.268e-06 deg
peri 250.0929130331754 9.3154e-06 deg
M 190.5466850530126 4.907e-06 deg
tp 2460049.984392470938
1.8984e-05 TDB
period 1388.313833595618
n .2593073635718444 4.2352e-10 deg/d
Q 2.833666517212829 3.0855e-09 au
  Orbit Determination Parameters
   # obs. used (total)      5330  
   data-arc span      56706 days (155.25 yr)  
   first obs. used      1866-04-06  
   last obs. used      2021-07-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .3878  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 21:03:20  

Additional Information
 Earth MOID = 1.0283 au 
 Jupiter MOID = 2.51116 au 
 T_jup = 3.484 
[ 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 7.52   n/a MPCxxxxx 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 LCDB (Rev. 2020-October); Warner et al., 2009 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.]
[Behrend, R. (2003) Observatoire de Geneve web site,]
[Torppa, J.; Kaasalainen, M.; Michalowski, T.; Kwiatkowski, T.; et al. (2003) Icarus 164, 346-383.]
[Faury, G. (2009) Bull. Amer. Astron. Soc. 40.]
[Behrend, R. (2010) Observatoire de Geneve web site,]
[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. (2018) 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 0.686   0.027 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=17; phase (min.=3.08, mean=16.43, max.=25.04) deg.
U-B UB 0.189   0.017 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #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 (A852 VA)          Discovered 1852-Nov-15 by Goldschmidt, H. at Paris
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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