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20 Massalia (A852 SA)
Classification: Main-belt Asteroid          SPK-ID: 2000020
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.

Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 113 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1428716196444644 2.1605e-08  
a 2.408252148866216 3.3487e-09 au
q 2.064181263845438 5.2323e-08 au
i .7088431769556595 2.3601e-06 deg
node 205.985982792055 0.00018727 deg
peri 257.5610454970266 0.00018745 deg
M 326.7102451664045 8.779e-06 deg
tp 2459522.729091809058
3.3375e-05 TDB
period 1365.058807985002
n .2637249017362154 5.5007e-10 deg/d
Q 2.752323033886994 3.8272e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2675  
   data-arc span      59991 days (164.25 yr)  
   first obs. used      1856-10-29  
   last obs. used      2021-01-28  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .58117  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 10:25:16  

Additional Information
 Earth MOID = 1.08144 au 
 Jupiter MOID = 2.37521 au 
 T_jup = 3.507 
[ 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 6.55   n/a E2021B10 IRAS observations used: 9
magnitude slope G 0.25   n/a PDS3 (MPC 17257) Fit
diameter diameter 135.680 km 3.674 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 8.098 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 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)]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
[Behrend, R. (2018) Observatoire de Geneve web site,]
[Cellino, A.; Hestroffer, D.; Lu, X.-P.; Muinonen, K.; Tanga, P. (2019) Astron. Astrophys. 631, A67.]
geometric albedo albedo 0.241   0.018 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
B-V BV 0.854   0.019 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=38; phase (min.=1.22, mean=9.15, max.=27.29) deg.
U-B UB 0.463   0.034 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #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 (A852 SA)          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
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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