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20 Massalia
Classification: Main-belt Asteroid          SPK-ID: 2000020
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2456800.5 (2014-May-23.0) TDB
Reference: JPL 84 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1429385988737971 2.0267e-08  
a 2.409343587560857 3.2253e-09 AU
q 2.06495539094934 4.9127e-08 AU
i .7080832485754642 2.3856e-06 deg
node 206.1765299526191 0.00018121 deg
peri 256.7374046850289 0.00018132 deg
M 3.173083348593056 8.1604e-06 deg
tp 2456788.460027015532
(2014-May-10.96002702)
3.0959e-05 JED
period 1365.986896099158
3.74
2.7429e-06
7.51e-09
d
yr
n .263545719968508 5.292e-10 deg/d
Q 2.753731784172373 3.6863e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      2039  
   data-arc span      58543 days (160.28 yr)  
   first obs. used      1853-12-26  
   last obs. used      2014-04-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .5876  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-16 13:08:07  

Additional Information
 Earth MOID = 1.08154 AU 
 T_jup = 3.507 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 6.50 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 9
magnitude slope G 0.25   n/a PDS3 (MPC 17257) Fit
diameter diameter 145.50 km 9.3 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 9
rotation period rot_per 8.098 h n/a Asteroid Lightcurve DataBase (Rev. 2013-Sep-12) Published Reference List:
[Gehrels, T. (1956) Astrophys. J. 123, 331-338.]
[Chang, Y.C.; Chang, C.-s. (1962) Acta Astron. Sin. 10, 101-111.]
[Magnusson, P. (1986) Icarus 68, 1-39.]
[Dotto, E.; De Angelis, G.; Di Martino, M.; Barucci, M.A.; et al. (1995) Icarus 117, 313-327.]
[Hainaut-Rouelle, M.-C.; Hainaut, O.R.; Detal, A. (1995) Astron. Astrophys. Suppl. Ser. 112, 125-142.]
[Szabo, Gy.; Sarneczky, K.; Kiss, L.L. (1999) in Proc. IAU Coll. 173, Evolution and Source Regions of Asteroids and Comets, 185-188.]
[Kaasalainen, M.; Torppa, J.; Piironen, J. (2002) Icarus 159, 369-395.]
[Bel'skaya, I.N.; Shevchenko, V.G.; Kiselev, N.; Krugly, Yu.N.; et al. (2003) Icarus 166, 276-284.]
[Higgins, D.J. (2012) http://www.david-higgins.com/Astronomy/astero id/lightcurves.htm]
geometric albedo albedo 0.2096   0.030 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 9
B-V BV .854 mag .019 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=38; phase (min.=1.22, mean=9.15, max.=27.29) deg.
U-B UB .463 mag .034 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=37; phase (min.=1.65, mean=9.37, max.=27.29) 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
SMASSII spectral type spec_B S   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)

20 Massalia          Discovered 1852-Sep-19 by De Gasparis, A. at Naples
Independent discovery the next night by J. Chacornac, Marseille, was announced first.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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