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45 Eugenia (A857 MA)
Classification: Main-belt Asteroid          SPK-ID: 2000045
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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 112 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08416452497965721 3.1671e-08  
a 2.719269794654291 5.4558e-09 au
q 2.490403744095683 8.6911e-08 au
i 6.605577478622298 3.2596e-06 deg
node 147.6001952253887 3.0816e-05 deg
peri 87.79615291357581 3.6526e-05 deg
M 126.6509963284098 2.0065e-05 deg
tp 2458424.287089650157
(2018-Nov-01.78708965)
9.093e-05 TDB
period 1637.860370147064
4.48
4.9292e-06
1.35e-08
d
yr
n .219798956346734 6.6149e-10 deg/d
Q 2.948135845212899 5.915e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3696  
   data-arc span      56429 days (154.49 yr)  
   first obs. used      1866-05-19  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47837  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:50:37  

Additional Information
 Earth MOID = 1.49003 au 
 Jupiter MOID = 2.0651 au 
 T_jup = 3.345 
[ hide covariance matrix ]
Orbital Elements at Epoch 2454419.5 (2007-Nov-15.0) TDB
Reference: JPL 112 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08181155625807156 3.1377e-08  
q 2.498606017682589 8.5913e-08 au
tp 2455135.125867744582
(2009-Oct-30.62586774)
9.3134e-05 TDB
node 147.9263965732759 3.0753e-05 deg
peri 85.44198854839912 3.6916e-05 deg
i 6.608885272350621 3.2628e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3696  
   data-arc span      56429 days (154.49 yr)  
   first obs. used      1866-05-19  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47837  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:50:37  

Additional Information
 Jupiter MOID = 2.0651 au 
 T_jup = 3.345 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.844945030420466E-16 -2.691060298060032E-15 4.571646947593836E-14 -1.098702695987881E-15 1.462265118506265E-14 -3.745845951212073E-16
q -2.691060298060032E-15 7.381111445946564E-15 -4.159802629668612E-14 2.074765277007364E-15 -2.446334812065891E-14 1.052864703692488E-15
tp 4.571646947593836E-14 -4.159802629668612E-14 8.673911593797762E-9 -1.15514411599907E-11 1.917927779104241E-9 7.583409461949024E-13
node -1.098702695987881E-15 2.074765277007364E-15 -1.15514411599907E-11 9.457697862777117E-10 -9.414335756348423E-10 3.662215305191928E-13
peri 1.462265118506265E-14 -2.446334812065891E-14 1.917927779104241E-9 -9.414335756348423E-10 1.36279556429398E-9 -1.987581911287868E-13
i -3.745845951212073E-16 1.052864703692488E-15 7.583409461949024E-13 3.662215305191928E-13 -1.987581911287868E-13 1.064617362113342E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 7.5   n/a MPO502153 IRAS observations used: 19
magnitude slope G 0.07   n/a PDS3 (MPC 17257) Fit
diameter diameter 202.327 km 2.168 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 5.699 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Harris, A.W.; Young, J. (1979) Icarus 38, 100-105.]
[Debehogne, H.; Zappala, V. (1980) Astron. Astrophys. Suppl. Ser. 40, 257-258.]
[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.]
[Taylor, R.C.; Birch, P.V.; Pospieszalska-Surdej, A.; Surdej, J. (1988) Icarus 73, 314-323.]
[Gil-Hutton, R. (1989) Minor Planet Bull. 16, 16-17.]
[Magnusson, P. (1990) Icarus 85, 229-240.]
[Drummond, J.D.; Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R. (1991) Icarus 89, 44-64.]
[De Angelis, G. (1995) Planet. Space Sci. 43, 649-682.]
[Behrend, R. (1998) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Harris, A.W.; Young, J.W.; Bowell, E.; Tholen, D.J. (1999) Icarus 142, 173-201.]
[Lopez-Gonzalez, M.J.; Rodriguez, E. (1999) Astron. Astrophys. Suppl. Ser. 139, 565-574.]
[Kaasalainen, M.; Torppa, J.; Piironen, J. (2002) Icarus 159, 369-395.]
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Hanus, J.; Marchis, F.; Durech, J. (2013) Icarus 226, 1045-1057.]
[Behrend, R. (2014) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
[Hanus, J.; Viikinkoski, M.; Marchis, F.; Durech, J.; et al (2017) Astron. Astrophys. 601, A114.]
geometric albedo albedo 0.045   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.676   0.018 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=22; phase (min.=.00, mean=13.63, max.=22.83) deg.
U-B UB 0.274   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=12; phase (min.=3.02, mean=12.35, max.=20.20) deg.
Tholen spectral type spec_T FC   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B C   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)

45 Eugenia (A857 MA)          Discovered 1857-Jun-27 by Goldschmidt, H. at Paris
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A857 MA = 1941 BN 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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