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8 Flora
Classification: Main-belt Asteroid          SPK-ID: 2000008
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ 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 .1563371332522309 2.2966e-08  
a 2.201958126348562 1.9197e-09 AU
q 1.857710305333774 5.0449e-08 AU
i 5.887771464691093 3.0563e-06 deg
node 110.9223230608095 2.561e-05 deg
peri 285.4669143010475 2.7188e-05 deg
M 71.83873369586421 1.0262e-05 deg
tp 2456762.340352741518
(2014-Apr-14.84035274)
3.3899e-05 JED
period 1193.471385172669
3.27
1.5607e-06
4.273e-09
d
yr
n .3016410820339156 3.9446e-10 deg/d
Q 2.54620594736335 2.2198e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      2311  
   data-arc span      60957 days (166.89 yr)  
   first obs. used      1847-11-03  
   last obs. used      2014-09-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .57766  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Oct-09 13:44:13  

Additional Information
 Earth MOID = .875049 AU 
 T_jup = 3.641 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 6.49 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 19
magnitude slope G 0.28   n/a PDS3 (MPC 17257) Fit
diameter diameter 135.89 km 2.3 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 19
rotation period rot_per 12.865 h n/a Asteroid Lightcurve DataBase (Rev. 2014-Mar-01) Published Reference List:
[Hollis, A.J.; Bembrick, C.S.; Dumont, M.; Miles, R. (1987) J. Brit. Astron. Assoc. 97, 220-223.]
[Di Martino, M.; Zappala, V.; Cellino, A.; Barucci, M.A.; et al. (1989) Astron. Astrophys.; 223, 352-360.]
[Harris, A.W.; Young, J.W. (1989) Icarus 81, 314-364.]
[Piironen, J.; Lagerkvist, C.-I.; Erikson, A.; Oja, T.; et al. (1998) Astron. Astrophys. Suppl. Ser. 128, 525-540.]
[Torppa, J.; Kaasalainen, M.; Michalowski, T.; Kwiatkowski, T.; et al. (2003) Icarus 164, 346-383.]
[Pilcher, F. (2009) Minor Planet Bul. 36, 133-136.]
[Durech, J.; Kaasalainen, M.; Herald, D.; Dunham, D.; et al. (2011) Icarus 214, 652-670.]
[Durech, J. (2011) Database of Asteroid Models from Inversion Techniques (DAMIT). http://astro.troja.mff.cuni.cz/projects/aster oids3D/web.php]
[Hanus, J.; Marchis, F.; Durech, J. (2013) Icarus 226, 1045-1057.]
geometric albedo albedo 0.2426   0.008 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 19
B-V BV .885 mag .015 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=9; phase (min.=8.07, mean=16.45, max.=32.13) deg.
U-B UB .489 mag .024 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=9; phase (min.=8.07, mean=17.27, max.=32.13) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo

8 Flora          Discovered 1847-Oct-18 by Hind, J. R. at London
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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