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54 Alexandra
Classification: Main-belt Asteroid          SPK-ID: 2000054
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 147 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1982863817855347 3.2563e-08  
a 2.710595437451152 7.7135e-09 AU
q 2.173121275674585 8.9598e-08 AU
i 11.80173877610573 4.0777e-06 deg
node 313.3365632604122 1.7134e-05 deg
peri 345.2759341973003 1.8986e-05 deg
M 24.54669554706475 9.2087e-06 deg
tp 2456889.356001550325
(2014-Aug-19.85600155)
4.1484e-05 JED
period 1630.029564067635
4.46
6.9579e-06
1.905e-08
d
yr
n .2208548899577275 9.4273e-10 deg/d
Q 3.24806959922772 9.243e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      1366  
   data-arc span      55139 days (150.96 yr)  
   first obs. used      1863-10-24  
   last obs. used      2014-10-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .56318  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Nov-10 12:40:40  

Additional Information
 Earth MOID = 1.16088 AU 
 T_jup = 3.305 
[ 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 7.66 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 14
diameter diameter 165.75 km 3.4 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 14
rotation period rot_per 7.024 h n/a Asteroid Lightcurve DataBase (Rev. 2014-Mar-01) Published Reference List:
[Van Houten-Groeneveld, I.; van Houten, C.J.; Zappala, V. (1979) Astron. Astrophys. Suppl. Ser. 35, 223-232.]
[Di Martino, M.; Zappala, V.; De Sanctis, G.; Cacciatori, S. (1987) Icarus 69, 338-353.]
[Bel'skaya, I.N.; Dovgopol, A.N.; Erikson, A.; Lagerkvist, C.-I.; Oja, T. (1993) Astron. Astrophys. Suppl. Ser. 101, 507-511.]
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Torppa, J.; Hentunen, V.-P.; Paakkonen, P.; Kehusmaa, P.; Muinonen, K. (2008) Icarus 198, 91-107.]
[Warner, B.D.; Durech, J.; Faurerbach, M.; Marks, S. (2008) Minor Planet Bul. 35, 167-171.]
[Higgins, D.; Warner, B.D. (2009) Minor Planet Bul. 36, 159-160.]
[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 0.0555   0.002 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 14
B-V BV .727 mag .027 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=9; phase (min.=4.77, mean=11.55, max.=25.49) deg.
U-B UB .357 mag .037 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=7; phase (min.=4.77, mean=11.92, max.=25.49) deg.
Tholen spectral type spec_T C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B C   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)

54 Alexandra          Discovered 1858-Sep-10 by Goldschmidt, H. at Paris
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1950 BT = 1974 HG1 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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