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238 Hypatia
Classification: Main-belt Asteroid          SPK-ID: 2000238
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2456800.5 (2014-May-23.0) TDB
Reference: JPL 53 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08640843819608741 4.3187e-08  
a 2.906786150665007 1.1646e-08 AU
q 2.655615299216026 1.2641e-07 AU
i 12.39305802076211 4.2993e-06 deg
node 183.9531637877307 2.6171e-05 deg
peri 209.7682848366015 4.0297e-05 deg
M 12.11898704331348 3.11e-05 deg
tp 2456739.562887583903
(2014-Mar-23.06288758)
0.00015633 JED
period 1810.16452871766
4.96
1.0878e-05
2.978e-08
d
yr
n .1988769497406006 1.1952e-09 deg/d
Q 3.157957002113987 1.2652e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1321  
   data-arc span      44477 days (121.77 yr)  
   first obs. used      1892-03-18  
   last obs. used      2013-12-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .64288  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jan-21 20:32:31  

Additional Information
 Earth MOID = 1.66547 AU 
 T_jup = 3.245 
[ 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 8.18 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 17
diameter diameter 148.49 km 3.6 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 17
rotation period rot_per 8.8745 h n/a Asteroid Lightcurve DataBase (Rev. 2013-Sep-12) Published Reference List:
[Schober, H.J. (1983) Astron. Astrophys. 117, 362-364.]
[Shevchenko, V.G.; Chiornij, V.G.; Krugly, Yu.N.; Lupishko, D.F.; et al. (1992) Icarus 100, 295-306.]
[Lagerkvist, C.-I.; Magnusson, P.; Debehogne, H.; Hoffmann, M.; et al. (1992) Astron. Astrophys. Suppl. Ser. 95, 461-470.]
[Riccioli, D.; Blanco, C.; Di Martino, M.; De Sanctis, G. (1995) Astron. Astrophys. Suppl. Ser. 111, 297-303.]
[Piironen, J.; Lagerkvist, C.-I.; Erikson, A.; Oja, T.; et al. (1998) Astron. Astrophys. Suppl. Ser. 128, 525-540.]
[Behrend, R. (2004) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.0428   0.002 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 17
B-V BV .739 mag .010 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=4; phase (min.=8.66, mean=13.76, max.=18.19) deg.
U-B UB .383 mag .036 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=5; phase (min.=8.66, mean=13.04, max.=18.19) 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 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)

238 Hypatia          Discovered 1884-Jul-01 by Knorre, V. at Berlin
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1947 HA 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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