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91 Aegina (A866 VA)
Classification: Main-belt Asteroid          SPK-ID: 2000091
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 128 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1066383827857759 3.1961e-08  
a 2.589443987642422 4.9161e-09 au
q 2.313309868485883 8.4036e-08 au
i 2.103371263581147 3.0958e-06 deg
node 10.43975317879974 9.4567e-05 deg
peri 74.37570141391407 9.5978e-05 deg
M 354.9291859319979 1.6336e-05 deg
tp 2459417.937956948994
(2021-Jul-22.43795695)
6.9085e-05 TDB
period 1521.977417854437
4.17
4.3343e-06
1.187e-08
d
yr
n .2365343899172299 6.736e-10 deg/d
Q 2.865578106798961 5.4404e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3202  
   data-arc span      56363 days (154.31 yr)  
   first obs. used      1866-11-10  
   last obs. used      2021-03-05  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46723  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 14:15:38  

Additional Information
 Earth MOID = 1.33049 au 
 Jupiter MOID = 2.31208 au 
 T_jup = 3.411 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 8.89   n/a E2021B10 IRAS observations used: 6
diameter diameter 103.402 km 0.483 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 6.025 h n/a LCDB (Rev. 2020-October); 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 Bull. 36, 109-116.]
[Franco, L.; Marchini, A.; Baj, G.; Scarfi, G.; et al. (2018) Minor Planet Bull. 45, 399-400.]
geometric albedo albedo 0.048   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.724   0.014 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=4.15, mean=9.96, max.=21.15) deg.
U-B UB 0.317   0.035 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #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 (A866 VA)          Discovered 1866-Nov-04 by Stephan, E. at Marseille
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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