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JPL Small-Body Database Browser
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91 Aegina
Classification: Main-belt Asteroid          SPK-ID: 2000091
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 119 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1063828868611459 3.7941e-08  
a 2.589529377142223 5.5427e-09 au
q 2.314047766390088 9.8199e-08 au
i 2.103208382977528 3.1388e-06 deg
node 10.44303777687403 0.00011043 deg
peri 74.27175495879787 0.00011164 deg
M 261.331023324291 1.6435e-05 deg
tp 2459417.664951415486
(2021-Jul-22.16495142)
6.9968e-05 TDB
period 1522.052701561536
4.17
4.8868e-06
1.338e-08
d
yr
n .2365226904631235 7.5939e-10 deg/d
Q 2.865010987894358 6.1324e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2652  
   data-arc span      55866 days (152.95 yr)  
   first obs. used      1866-11-10  
   last obs. used      2019-10-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50416  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 01:49:21  

Additional Information
 Earth MOID = 1.33125 au 
 Jupiter MOID = 2.31299 au 
 T_jup = 3.411 
[ show covariance matrix ]

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 8.9   n/a MPO492749 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. 2019-August); 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          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 | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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