238 Hypatia
{{Short description|Main-belt asteroid}}
{{Infobox planet
| minorplanet=yes
| background=#D6D6D6
|image=000238-asteroid shape model (238) Hypatia.png
|caption=3D model based on lightcurve data
| name=238 Hypatia
| discoverer=Viktor Knorre
| discovered=1 July 1884
| mpc_name=(238) Hypatia
| pronounced={{IPAc-en|h|ɪ|ˈ|p|eɪ|ʃ|i|ə}}{{Cite encyclopedia |url=http://www.lexico.com/definition/Hypatia |archive-url=https://web.archive.org/web/20200323121117/https://www.lexico.com/definition/hypatia |url-status=dead |archive-date=March 23, 2020 |title=Hypatia |dictionary=Lexico UK English Dictionary |publisher=Oxford University Press}}
| adjective=Hypatian
| alt_names=A884 NA, 1947 HA
| named_after=Hypatia
| mp_category=Main belt
| epoch=31 July 2016 (JD 2457600.5)
| semimajor={{Convert|2.9083|AU|Gm|abbr=on}}
| perihelion={{Convert|2.6514|AU|Gm|abbr=on}}
| aphelion={{Convert|3.1652|AU|Gm|abbr=on|lk=on}}
| eccentricity=0.088335
| inclination=12.413°
| asc_node=183.89°
| arg_peri=210.750°
| mean_anomaly=170.00°
| avg_speed=17.47 km/s
| dimensions={{val|148.49|3.6|ul=km}}
146.13 ± 2.66 km
| mass={{nowrap|(4.90 ± 1.70) × 1018 kg}}
| rotation={{Convert|8.8749|h|d|abbr=on|lk=on}}
| spectral_type=C
| abs_magnitude=8.18
| albedo={{val|0.0428|0.002}}
| single_temperature=
| mean_motion={{Deg2DMS|0.19872|sup=ms}} / day
| observation_arc=124.07 yr (45318 d)
| uncertainty=0
}}
238 Hypatia is a 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 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. Stellar occultation events were observed for this asteroid during 2001 and 2005. The resulting chords provided cross-section diameter estimates of 146.5 and 145.3 km, respectively.
References
{{Reflist|refs=
| first1 = Donald K.
| last1 = Yeomans
| title = 238 Hypatia
| work = JPL Small-Body Database Browser
| publisher = NASA Jet Propulsion Laboratory
| url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=238
| accessdate= 12 May 2016
| postscript= .
}}
| first1 = B.
| last1 = Carry
| title = Density of asteroids
| journal = Planetary and Space Science
| volume = 73
| issue = 1
| pages = 98–118
|date=December 2012
| doi = 10.1016/j.pss.2012.03.009
| bibcode = 2012P&SS...73...98C
| postscript= .
|arxiv = 1203.4336 }} See Table 1.
| last1 = Schober
| first1 = H. J.
| title = Rotation periods and lightcurves of the asteroids 136 Austria and 238 Hypatia
| journal = Astronomy and Astrophysics
| volume = 117
| issue = 2
| pages = 362–364
|date=January 1983
| bibcode = 1983A&A...117..362S
| postscript= .
}}
| display-authors=1
| last1=Piironen | first1=J.
| last2=Lagerkvist | first2=C.-I.
| last3=Erikson | first3=A.
| last4=Oja | first4=T.
| last5=Magnusson | first5=P.
| last6=Festin | first6=L.
| last7=Nathues | first7=A.
| last8=Gaul | first8=M.
| last9=Velichko | first9=F.
| title=Physical studies of asteroids. XXXII. Rotation periods and UBVRI-colours for selected asteroids
| journal=Astronomy and Astrophysics Supplement
| volume=128 | issue=3 | pages=525–540 | date=March 1998
| doi=10.1051/aas:1998393 | bibcode=1998A&AS..128..525P | postscript=.
| doi-access=free}}
| title=Asteroid albedos deduced from stellar occultations
| last1=Shevchenko | first1=Vasilij G. | last2=Tedesco | first2=Edward F.
| journal=Icarus | postscript=.
| volume=184 | issue=1 | pages=211–220 | date=September 2006
| doi=10.1016/j.icarus.2006.04.006 | bibcode=2006Icar..184..211S }}
}}
External links
- [http://ftp.lowell.edu/pub/elgb/astorb.html The Asteroid Orbital Elements Database]
- [http://cfa-www.harvard.edu/iau/lists/NumberedMPs.html Minor Planet Discovery Circumstances]
- [http://spiff.rit.edu/richmond/parallax/phot/LCSUMPUB.TXT Asteroid Lightcurve Data File]
- {{AstDys|238}}
- {{JPL small body}}
{{Minor planets navigator|237 Coelestina|number=238|239 Adrastea}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:000238}}
Category:C-type asteroids (Tholen)
Category:Ch-type asteroids (SMASS)
{{C-beltasteroid-stub}}