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

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 71 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0837903622046085 2.802e-08  
a 2.577044531630504 3.6696e-09 AU
q 2.361113036907778 7.2057e-08 AU
i 16.5374772038482 3.617e-06 deg
node 43.25137475486958 1.1771e-05 deg
peri 80.14846980315265 2.3057e-05 deg
M 166.7206425203071 1.9627e-05 deg
tp 2456300.709268084541
(2013-Jan-08.20926808)
8.2254e-05 JED
period 1511.058616864916
4.14
3.2275e-06
8.836e-09
d
yr
n .2382435704227766 5.0887e-10 deg/d
Q 2.79297602635323 3.977e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      1910  
   data-arc span      60030 days (164.35 yr)  
   first obs. used      1850-11-21  
   last obs. used      2015-03-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .64058  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Apr-07 15:57:46  

Additional Information
 Earth MOID = 1.43989 AU 
 T_jup = 3.364 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 6.74 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 3
diameter diameter 207.64 km 8.3 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 3
rotation period rot_per 7.045 h n/a LCDB (Rev. 2015-May); 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) Planetary and Space Sci. 49, 657-671.]
[Pilcher, F. (2009) Minor Planet Bul. 36, 133-136.]
[Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.]
geometric albedo albedo 0.0825   0.007 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 3
B-V BV .745 mag .020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=8; phase (min.=9.59, mean=18.30, max.=24.72) deg.
U-B UB .452 mag .034 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #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 | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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