238 Hypatia

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238 Hypatia
Discovery
Discovered by Viktor Knorre
Discovery date 1 July 1884
Designations
Named after
Hypatia
1947 HA
Main belt
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 124.07 yr (45318 d)
Aphelion 3.1652 AU (473.51 Gm)
Perihelion 2.6514 AU (396.64 Gm)
2.9083 AU (435.08 Gm)
Eccentricity 0.088335
4.96 yr (1811.5 d)
17.47 km/s
170.00°
0° 11m 55.392s / day
Inclination 12.413°
183.89°
210.750°
Earth MOID 1.66193 AU (248.621 Gm)
Jupiter MOID 2.2762 AU (340.51 Gm)
Jupiter Tisserand parameter 3.244
Physical characteristics
Dimensions 148.49±3.6 km[1]
146.13 ± 2.66 km[2]
Mass (4.90 ± 1.70) × 1018 kg[2]
Mean density
2.99 ± 1.05 g/cm3[2]
8.8749 h (0.36979 d)
0.0428±0.002
C
8.18

238 Hypatia is a very large main-belt asteroid that was discovered by Russian astronomer Viktor Knorre on July 1, 1884, in Berlin. It was the third of his four asteroid discoveries. The name was given in honour of philosopher Hypatia of Alexandria. Based upon the spectrum, it is classified as a C-type asteroid[3] and is probably composed of primitive carbonaceous material. Like many asteroids of this type, its surface is very dark in colour.

Photometric observations of this asteroid at the European Southern Observatory in 1981 gave a light curve with a period of 8.9 ± 0.1 hours and a brightness variation of 0.12 in magnitude.[4]

References[edit]

  1. ^ a b Yeomans, Donald K., "238 Hypatia", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016. 
  2. ^ a b c Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73, pp. 98–118, arXiv:1203.4336Freely accessible, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009.  See Table 1.
  3. ^ Piironen, J.; et al. (March 1998), "Physical studies of asteroids. XXXII. Rotation periods and UBVRI-colours for selected asteroids", Astronomy and Astrophysics Supplement, 128: 525–540, Bibcode:1998A&AS..128..525P, doi:10.1051/aas:1998393. 
  4. ^ Schober, H. J. (January 1983), "Rotation periods and lightcurves of the asteroids 136 Austria and 238 Hypatia", Astronomy and Astrophysics, 117 (2), pp. 362–364, Bibcode:1983A&A...117..362S. 

External links[edit]