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238 Hypatia
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 85 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08980097854818621 3.3114e-08  
a 2.907142508429264 9.7852e-09 au
q 2.646078266393287 9.8891e-08 au
i 12.41106480145457 3.4862e-06 deg
node 183.8674084268816 1.8901e-05 deg
peri 210.6704856284014 2.8932e-05 deg
M 88.52900362459505 2.1853e-05 deg
tp 2458555.273521651082
(2019-Mar-12.77352165)
0.00010972 TDB
period 1810.497414895577
4.96
9.141e-06
2.503e-08
d
yr
n .198840383332314 1.0039e-09 deg/d
Q 3.16820675046524 1.0664e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2811  
   data-arc span      46707 days (127.88 yr)  
   first obs. used      1892-03-18  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46635  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:21:35  

Additional Information
 Earth MOID = 1.65802 au 
 Jupiter MOID = 2.27695 au 
 T_jup = 3.244 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455127.5 (2009-Oct-23.0) TDB
Reference: JPL 85 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08642438697843177 3.2665e-08  
q 2.655951333463951 9.6998e-08 au
tp 2454923.070471222763
(2009-Apr-01.57047122)
0.00011608 TDB
node 183.9797931312012 1.894e-05 deg
peri 208.7657893274828 2.9889e-05 deg
i 12.39199094645744 3.4817e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2811  
   data-arc span      46707 days (127.88 yr)  
   first obs. used      1892-03-18  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46635  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:21:35  

Additional Information
 Jupiter MOID = 2.27695 au 
 T_jup = 3.244 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.066973630669213E-15 -3.155962296377745E-15 7.258787790060289E-13 -2.898616750866506E-15 1.352947301372148E-13 -5.666653087792749E-16
q -3.155962296377745E-15 9.408550441368508E-15 -2.175700323938577E-12 9.459479541160831E-15 -4.061038313366036E-13 2.349635165146965E-15
tp 7.258787790060289E-13 -2.175700323938577E-12 1.347458710975129E-8 -4.39362329736691E-12 2.708472808697504E-9 -9.139735081932064E-12
node -2.898616750866506E-15 9.459479541160831E-15 -4.39362329736691E-12 3.587397120671888E-10 -3.50963244243197E-10 9.098604132751328E-12
peri 1.352947301372148E-13 -4.061038313366036E-13 2.708472808697504E-9 -3.50963244243197E-10 8.933433396734818E-10 -1.058872337843683E-11
i -5.666653087792749E-16 2.349635165146965E-15 -9.139735081932064E-12 9.098604132751328E-12 -1.058872337843683E-11 1.212234555540052E-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          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 | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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