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JPL Small-Body Database Browser
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13 Egeria
Classification: Main-belt Asteroid          SPK-ID: 2000013
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 91 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08528311134387449 3.2661e-08  
a 2.576063889099231 3.4708e-09 au
q 2.356369145616247 8.3919e-08 au
i 16.53553175374091 3.7826e-06 deg
node 43.2210228007982 1.2765e-05 deg
peri 80.41454240386794 2.5806e-05 deg
M 283.0025921738223 2.2196e-05 deg
tp 2459323.503311886174
(2021-Apr-19.00331189)
9.3199e-05 TDB
period 1510.196194416419
4.13
3.0521e-06
8.356e-09
d
yr
n .2383796233436503 4.8176e-10 deg/d
Q 2.795758632582215 3.7668e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2433  
   data-arc span      61798 days (169.19 yr)  
   first obs. used      1850-11-21  
   last obs. used      2020-02-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56183  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:13:50  

Additional Information
 Earth MOID = 1.4357 au 
 Jupiter MOID = 2.35686 au 
 T_jup = 3.364 
[ hide covariance matrix ]
Orbital Elements at Epoch 2451913.5 (2001-Jan-04.0) TDB
Reference: JPL 91 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08451551991899257 3.2565e-08  
q 2.358066147969361 8.3589e-08 au
tp 2451772.238570047167
(2000-Aug-15.73857005)
9.4272e-05 TDB
node 43.32400438208041 1.2762e-05 deg
peri 80.77651914394623 2.6065e-05 deg
i 16.54120425970847 3.7828e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2433  
   data-arc span      61798 days (169.19 yr)  
   first obs. used      1850-11-21  
   last obs. used      2020-02-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56183  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:13:50  

Additional Information
 Jupiter MOID = 2.35686 au 
 T_jup = 3.364 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.060480685447022E-15 -2.720052417968702E-15 4.325039364163989E-14 -1.154933379338323E-16 2.282887675862283E-14 -1.823710052199088E-15
q -2.720052417968702E-15 6.987167095517611E-15 -1.442927375646539E-13 8.98761108183617E-16 -6.710611932626012E-14 4.401387466439539E-15
tp 4.325039364163989E-14 -1.442927375646539E-13 8.887206774658091E-9 -7.208821962308011E-12 2.15547806051269E-9 3.415224867317693E-12
node -1.154933379338323E-16 8.98761108183617E-16 -7.208821962308011E-12 1.628611849366459E-10 -1.576145490874732E-10 -1.921646354284452E-12
peri 2.282887675862283E-14 -6.710611932626012E-14 2.15547806051269E-9 -1.576145490874732E-10 6.793645602997013E-10 2.51399934317554E-12
i -1.823710052199088E-15 4.401387466439539E-15 3.415224867317693E-12 -1.921646354284452E-12 2.51399934317554E-12 1.430967718025802E-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. 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          Discovered 1850-Nov-02 by De Gasparis, A. at Naples
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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