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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 99 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08537031021984334 3.232e-08  
a 2.576616260875998 3.2911e-09 au
q 2.356649731367522 8.3182e-08 au
i 16.53380927921495 3.7357e-06 deg
node 43.21908128194797 1.2548e-05 deg
peri 80.29318617775182 2.5466e-05 deg
M 330.7918450527204 2.1733e-05 deg
tp 2459323.067312871314
(2021-Apr-18.56731287)
9.1223e-05 TDB
period 1510.681955546899
4.14
2.8944e-06
7.924e-09
d
yr
n .2383029721631065 4.5657e-10 deg/d
Q 2.796582790384475 3.572e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2910  
   data-arc span      62206 days (170.31 yr)  
   first obs. used      1850-11-21  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5409  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 17:43:21  

Additional Information
 Earth MOID = 1.43572 au 
 Jupiter MOID = 2.35562 au 
 T_jup = 3.364 
[ hide covariance matrix ]
Orbital Elements at Epoch 2452079.5 (2001-Jun-19.0) TDB
Reference: JPL 99 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08456498975835153 3.2215e-08  
q 2.358315982960167 8.2812e-08 au
tp 2451772.602821604004
(2000-Aug-16.10282160)
9.2961e-05 TDB
node 43.32594159043521 1.2544e-05 deg
peri 80.87876842682778 2.5729e-05 deg
i 16.54051678254964 3.7358e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2910  
   data-arc span      62206 days (170.31 yr)  
   first obs. used      1850-11-21  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5409  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 17:43:21  

Additional Information
 Jupiter MOID = 2.35562 au 
 T_jup = 3.364 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.037798123963602E-15 -2.665937815886215E-15 -1.767817872054589E-14 2.079088835918921E-16 9.089287852151734E-15 -1.801854995801051E-15
q -2.665937815886215E-15 6.857822457810708E-15 2.40216577141234E-15 1.509142962803945E-16 -3.405325719151823E-14 4.369314201595989E-15
tp -1.767817872054589E-14 2.40216577141234E-15 8.641720505687921E-9 -6.45995440124095E-12 2.100593448230735E-9 3.855396324619205E-12
node 2.079088835918921E-16 1.509142962803945E-16 -6.45995440124095E-12 1.573500326347871E-10 -1.521765039378585E-10 -7.385691594219333E-13
peri 9.089287852151734E-15 -3.405325719151823E-14 2.100593448230735E-9 -1.521765039378585E-10 6.620026145394879E-10 1.479758348581269E-12
i -1.801854995801051E-15 4.369314201595989E-15 3.855396324619205E-12 -7.385691594219333E-13 1.479758348581269E-12 1.395612015841783E-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 6.83   n/a E2021B10 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
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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