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13 Egeria (A850 VA)
Classification: Main-belt Asteroid          SPK-ID: 2000013
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 94 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0852831049363596 3.2533e-08  
a 2.576063887996231 3.4409e-09 au
q 2.356369161113482 8.3622e-08 au
i 16.53553209540407 3.7757e-06 deg
node 43.22102044223319 1.2681e-05 deg
peri 80.41454082499094 2.5714e-05 deg
M 283.0025974957243 2.2091e-05 deg
tp 2459323.503289353399
(2021-Apr-19.00328935)
9.275e-05 TDB
period 1510.196193446482
4.13
3.0258e-06
8.284e-09
d
yr
n .2383796234967517 4.7761e-10 deg/d
Q 2.79575861487898 3.7343e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2817  
   data-arc span      62070 days (169.94 yr)  
   first obs. used      1850-11-21  
   last obs. used      2020-10-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5266  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:34:22  

Additional Information
 Earth MOID = 1.4357 au 
 Jupiter MOID = 2.35686 au 
 T_jup = 3.364 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 6.8   n/a MPO492748 IRAS observations used: 3
diameter diameter 202.636 km 50.084 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  
rotation period rot_per 7.045 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Chang, Y.C.; Chang, C.-s. (1963) Acta Astron. Sin. 11, 139-149.]
[Lagerkvist, C.I.; Magnusson, P.; Williams, I.P.; Buontempo, M.E.; et al. (1988) Astron. Astrophys. Suppl. Ser. 73, 395-405.]
[Piironen, J.; Lagerkvist, C.-I.; Erikson, A.; Oja, T.; et al. (1998) Astron. Astrophys. Suppl. Ser. 128, 525-540.]
[Riccioli, D.; Blanco, C.; Cigna, M. (2001) Planet. Space Sci. 49, 657-671.]
[Pilcher, F. (2009) Minor Planet Bull. 36, 133-136.]
[Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.]
[Behrend, R. (2016) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Hanus, J.; Viikinkoski, M.; Marchis, F.; Durech, J.; et al (2017) Astron. Astrophys. 601, A114.]
geometric albedo albedo 0.049   0.028 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2017AJ....154..168M)  
B-V BV 0.745   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=8; phase (min.=9.59, mean=18.30, max.=24.72) deg.
U-B UB 0.452   0.034 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=8; phase (min.=9.59, mean=18.30, max.=24.72) deg.
Tholen spectral type spec_T G   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 4 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B Ch   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)

13 Egeria (A850 VA)          Discovered 1850-Nov-02 by De Gasparis, A. at Naples
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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