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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 | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 87 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08980097408303239 3.2344e-08  
a 2.90714250984545 9.4574e-09 au
q 2.646078280663137 9.621e-08 au
i 12.4110646255793 3.4227e-06 deg
node 183.8674081776036 1.8712e-05 deg
peri 210.6704863652902 2.8775e-05 deg
M 88.52900240603235 2.1804e-05 deg
tp 2458555.273527454097
(2019-Mar-12.77352745)
0.0001095 TDB
period 1810.497416218526
4.96
8.8347e-06
2.419e-08
d
yr
n .1988403831870193 9.7029e-10 deg/d
Q 3.168206739027763 1.0307e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2984  
   data-arc span      46978 days (128.62 yr)  
   first obs. used      1892-03-18  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45433  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:31:52  

Additional Information
 Earth MOID = 1.65802 au 
 Jupiter MOID = 2.27695 au 
 T_jup = 3.244 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455263.5 (2010-Mar-08.0) TDB
Reference: JPL 87 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08650243263177165 3.1914e-08  
q 2.656149150194966 9.4402e-08 au
tp 2454923.442600010569
(2009-Apr-01.94260001)
0.00011576 TDB
node 183.9767677878881 1.875e-05 deg
peri 208.8555758708709 2.9707e-05 deg
i 12.39201368204668 3.4185e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2984  
   data-arc span      46978 days (128.62 yr)  
   first obs. used      1892-03-18  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45433  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:31:52  

Additional Information
 Jupiter MOID = 2.27695 au 
 T_jup = 3.244 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.018510497331002E-15 -3.000841340432586E-15 7.06027479706429E-13 -2.861206615680511E-15 1.293519503448915E-13 -5.108855287985849E-16
q -3.000841340432586E-15 8.911693966823585E-15 -2.113385102640249E-12 9.167132276474648E-15 -3.870928005595246E-13 2.137071107865238E-15
tp 7.06027479706429E-13 -2.113385102640249E-12 1.339989917506617E-8 -2.970979436896024E-12 2.691124125597816E-9 -8.797011426607491E-12
node -2.861206615680511E-15 9.167132276474648E-15 -2.970979436896024E-12 3.515649280114067E-10 -3.436942390306321E-10 7.44786002791931E-12
peri 1.293519503448915E-13 -3.870928005595246E-13 2.691124125597816E-9 -3.436942390306321E-10 8.825026052433165E-10 -8.910850509818609E-12
i -5.108855287985849E-16 2.137071107865238E-15 -8.797011426607491E-12 7.44786002791931E-12 -8.910850509818609E-12 1.168588727440789E-11

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 8.1   n/a MPO502155 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. 2019-August); 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 Macias, A. (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

[ show close-approach data ]
Alternate Designations
 A884 NA = 1947 HA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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