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238 Hypatia (A884 NA)
Classification: Main-belt Asteroid          SPK-ID: 2000238
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 96 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09017269272807106 2.3993e-08  
a 2.906133928967094 7.5934e-09 au
q 2.644080007163723 6.8523e-08 au
i 12.4142756772833 5.7228e-07 deg
node 183.8627339870674 1.0395e-06 deg
peri 210.5603455852789 7.0934e-06 deg
M 167.3863195522874 9.3713e-06 deg
tp 2458555.125542202989
(2019-Mar-12.62554220)
4.5494e-05 TDB
period 1809.555318601215
4.95
7.0922e-06
1.942e-08
d
yr
n .198943904228515 7.7972e-10 deg/d
Q 3.168187850770466 8.2781e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3593  
   data-arc span      47253 days (129.37 yr)  
   first obs. used      1892-03-18  
   last obs. used      2021-08-02  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42071  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 06:22:58  

Additional Information
 Earth MOID = 1.65524 au 
 Jupiter MOID = 2.27743 au 
 T_jup = 3.244 
[ 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 8.10   n/a MPO636063 IRAS observations used: 17
diameter diameter 155.659 km 0.751 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 8.8749 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Schober, H.J. (1983) Astron. Astrophys. 117, 362-364.]
[Lagerkvist, C.-I.; Magnusson, P.; Debehogne, H.; Hoffmann, M.; et al. (1992) Astron. Astrophys. Suppl. Ser. 95, 461-470.]
[Shevchenko, V.G.; Chiornij, V.G.; Krugly, Yu.N.; Lupishko, D.F.; et al. (1992) Icarus 100, 295-306.]
[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]
[Aznar, A.M. (2016) Minor Planet Bull. 43, 350-353]
geometric albedo albedo 0.039   0.002 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.739   0.010 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=8.66, mean=13.76, max.=18.19) deg.
U-B UB 0.383   0.036 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #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 (A884 NA)          Discovered 1884-Jul-01 by Knorre, V. at Berlin
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A884 NA = 1947 HA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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