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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.


Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 96 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08528309821593401 3.2501e-08  
a 2.576063886720501 3.4286e-09 au
q 2.356369177258795 8.355e-08 au
i 16.53553175403836 3.771e-06 deg
node 43.22102210563073 1.2655e-05 deg
peri 80.41453387393618 2.5675e-05 deg
M 283.0026046788469 2.2036e-05 deg
tp 2459323.503258980337
(2021-Apr-19.00325898)
9.2518e-05 TDB
period 1510.196192324652
4.13
3.015e-06
8.255e-09
d
yr
n .2383796236738289 4.7591e-10 deg/d
Q 2.795758596182206 3.721e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2829  
   data-arc span      62086 days (169.98 yr)  
   first obs. used      1850-11-21  
   last obs. used      2020-11-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53099  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:50:23  

Additional Information
 Earth MOID = 1.4357 au 
 Jupiter MOID = 2.35686 au 
 T_jup = 3.364 
[ hide covariance matrix ]
Orbital Elements at Epoch 2452012.5 (2001-Apr-13.0) TDB
Reference: JPL 96 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08455539845706982 3.2403e-08  
q 2.358220757903267 8.321e-08 au
tp 2451772.485020098565
(2000-Aug-15.98502010)
9.3794e-05 TDB
node 43.3254667375076 1.2652e-05 deg
peri 80.84533136998725 2.5922e-05 deg
i 16.54080092014978 3.7709e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2829  
   data-arc span      62086 days (169.98 yr)  
   first obs. used      1850-11-21  
   last obs. used      2020-11-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53099  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:50:23  

Additional Information
 Jupiter MOID = 2.35686 au 
 T_jup = 3.364 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.049941329368945E-15 -2.694234688190568E-15 1.520414117302933E-14 -2.275377145205596E-16 1.68439750841157E-14 -1.745753301939918E-15
q -2.694234688190568E-15 6.923862579169168E-15 -7.695467135966625E-14 1.230234610542149E-15 -5.275947351775515E-14 4.210731909889755E-15
tp 1.520414117302933E-14 -7.695467135966625E-14 8.797350482570284E-9 -6.444128464577539E-12 2.134614953316689E-9 3.479737918813899E-12
node -2.275377145205596E-16 1.230234610542149E-15 -6.444128464577539E-12 1.600736759478433E-10 -1.547676888122402E-10 -1.451391335704402E-12
peri 1.68439750841157E-14 -5.275947351775515E-14 2.134614953316689E-9 -1.547676888122402E-10 6.719295709207424E-10 2.075901927755089E-12
i -1.745753301939918E-15 4.210731909889755E-15 3.479737918813899E-12 -1.451391335704402E-12 2.075901927755089E-12 1.421996828784494E-11

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. 2020-October); 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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