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91 Aegina
Classification: Main-belt Asteroid          SPK-ID: 2000091
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 97 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .106788126819927 4.2386e-08  
a 2.58952360169754 6.5523e-09 AU
q 2.312993226916269 1.1e-07 AU
i 2.10677027818161 3.2958e-06 deg
node 10.66682105207622 0.00012235 deg
peri 72.73142128874038 0.00012383 deg
M 149.988668015474 1.5505e-05 deg
tp 2456366.361406611874
(2013-Mar-14.86140661)
6.496e-05 JED
period 1522.047609597901
4.17
5.7769e-06
1.582e-08
d
yr
n .2365234817425362 8.9772e-10 deg/d
Q 2.866053976478811 7.252e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      1589  
   data-arc span      54210 days (148.42 yr)  
   first obs. used      1866-11-10  
   last obs. used      2015-04-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .61681  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jun-04 15:27:11  

Additional Information
 Earth MOID = 1.32971 AU 
 T_jup = 3.411 
[ 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 8.84 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 6
diameter diameter 109.81 km 3.3 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 6
rotation period rot_per 6.025 h n/a LCDB (Rev. 2015-May); Warner et al., 2009 Published Reference List:
[Harris, A.W.; Young, J.W. (1980) Icarus 43, 20-32.]
[Shevchenko, V.G.; Piironen, J.; Erikson, A.; Bel'skaya, I.N.; et al. (1997) Planet. Space Sci. 45, 1615-1623.]
[Warner, B.D. (2009) Minor Planet Bul. 36, 109-116.]
geometric albedo albedo 0.0426   0.003 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 6
B-V BV .724 mag .014 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=3; phase (min.=4.15, mean=9.96, max.=21.15) deg.
U-B UB .317 mag .035 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=3; phase (min.=4.15, mean=9.96, max.=21.15) deg.
Tholen spectral type spec_T CP   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 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)

91 Aegina          Discovered 1866-Nov-04 by Stephan, E. at Marseille
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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