92 Undina
{{Short description|Main-belt asteroid}}
{{About|asteroid (92) Undina||Undine (disambiguation){{!}}Undine}}
{{Use dmy dates|date=September 2019}}
{{Infobox planet
| minorplanet=yes
| image=92 Undina (orbit).gif
| image_scale =
| background=#D6D6D6
| name=92 Undina
| discoverer=C. H. F. Peters
| discovery_site = Litchfield Obs.
| discovered=7 July 1867
| mpc_name=(92) Undina
| alt_names=
| pronounced = {{IPAc-en|ʌ|n|ˈ|d|aɪ|n|ə}}Hunter, Roe & Hooker (1906) The New American Encyclopedic Dictionary
| adjective=Undinian {{IPAc-en|ʌ|n|ˈ|d|ɪ|n|i|ən}}Readings: the poetics of Blanchot, Joyce, Kafka, Kleist, Lispector, and Tsvetayeva (1991) Cixous
| mp_category=Main belt
| observation_arc=145.11 yr (53001 d)
| epoch=31 July 2016 (JD 2457600.5)
| uncertainty=0
| semimajor={{Convert|3.18800|AU|Gm|abbr=on}}
| perihelion={{Convert|2.85654|AU|Gm|abbr=on}}
| aphelion={{Convert|3.51946|AU|Gm|abbr=on|lk=on}}
| eccentricity=0.10397
| inclination=9.92900°
| asc_node=101.588°
| arg_peri=239.494°
| mean_anomaly=6.12456°
| mean_motion={{Deg2DMS|0.173152|sup=ms}} / day
| mean_diameter={{val|126.42|3.4|ul=km}}
124.44 ± 3.25 km
| mass={{nowrap|(4.43 ± 0.25) × 1018 kg}}
| rotation={{Convert|15.941|h|d|abbr=on|lk=on}}
| spectral_type=M
| abs_magnitude=6.61
| albedo={{val|0.2509|0.014}}
0.251{{Cite web |url=http://www.psi.edu/pds/resource/albedo.html |title=Asteroid Data Sets |access-date=14 January 2007 |archive-date=17 December 2009 |archive-url=https://web.archive.org/web/20091217104722/http://www.psi.edu/pds/resource/albedo.html |url-status=dead }}
}}
92 Undina (from Latin Undīna) is a large main belt asteroid. The asteroid was discovered by Christian Peters on 7 July 1867 from the Hamilton College Observatory. It is named for the eponymous heroine of Undine, a popular novella by Friedrich de la Motte Fouqué.
This minor planet is orbiting at a distance of around 3 AU from the Sun, which is known for a concentration of Tholen M-type asteroids. Indeed, 92 Undina has an unusually high albedo of 0.25 and an M-type spectrum, or Xc-type on the Bus taxonomy. However, it displays absorption features at a wavelength of 3 μm, which is usually indicative of hydrated silicates on the surface. There is a faint band in the region of 9 μm that is typically attributed to a form of orthopyroxene having low levels of calcium and iron. The spectrum of 92 Undina closely resembles powdered material from the Esquel meteorite, although with a higher albedo.
Observations performed at the Palmer Divide Observatory in Colorado Springs, Colorado during 2007 produced a light curve with a period of 15.941 ± 0.002 hours with a brightness range of 0.20 ± 0.02 in magnitude. This matches a 15.94-hour period reported in 1979. Attempts in 2014 to model the spin axis and shape based on light curve information proved inconclusive, but did indicate that "the pole latitude is not far removed from the ecliptic plane and rotation is probably retrograde".
References
{{Reflist|refs=
|url=https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=92;cad=1
|title=92 Undina
|work=JPL Small-Body Database
|publisher=NASA/Jet Propulsion Laboratory
|access-date=13 May 2016}}
| first1 = B.
| last1 = Carry
| title = Density of asteroids
| work = Planetary and Space Science
| volume = 73
| 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.
| title=Minor Planets 93 and 94 discovered
| last1=Watson | first1=J.
| journal=Monthly Notices of the Royal Astronomical Society
| volume=28 | page=15 | date=November 1867
| bibcode=1867MNRAS..28...15W | postscript=. }}
| title=Rotation Period, Spin Axis, and Shape Model for Main-belt Asteroid 92 Undina
| last1=Warner | first1=Brian D.
| journal=The Minor Planet Bulletin
| volume=41 | issue=4 | pages=230−233 | date=October 2014
| bibcode=2014MPBu...41..230W | postscript=. }}
| contribution=Asteroid Spectroscopy and Mineralogy
| last1=Burbine | first1=T. H. | last2=Binzel | first2=R. P.
| title=Asteroids, comets, meteors 1993: proceedings of the 160th International Astronomical Union, held in Belgirate, Italy, June 14-18, 1993
| editor1-first=Andrea | editor1-last=Milani
| editor2-first=Michel | editor2-last=Di Martino
| editor3-first=A. | editor3-last=Cellino
| publisher=International Astronomical Union. Symposium no. 160, Kluwer Academic Publishers, Dordrecht
| page=255 | year=1994
| bibcode=1994IAUS..160..255B | postscript=. }}
| title=Spectroscopic survey of X-type asteroids
| display-authors=1 | last1=Fornasier | first1=S.
| last2=Clark | first2=B. E. | last3=Dotto | first3=E.
| journal=Icarus | volume=214 | issue=1 | pages=131−146 | date=July 2011
| doi=10.1016/j.icarus.2011.04.022 | bibcode=2011Icar..214..131F | arxiv=1105.3380}}
| first1 = Brian D.
| last1 = Warner
| title = Asteroid Lightcurve Analysis at the Palmer Divide Observatory
| work = The Minor Planet Bulletin
|date=September 2007
| bibcode = 2007MPBu...34...72W
| postscript= .}}
}}
External links
- [http://www.minorplanetobserver.com/pdolc/A92_2011.HTM Lightcurve plot of 92 Undina], Palmer Divide Observatory, B. D. Warner (2011)
- [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info] {{Webarchive|url=https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html |date=16 December 2017 }})
- [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books
- [http://obswww.unige.ch/~behrend/page_cou.html Asteroids and comets rotation curves, CdR] – Observatoire de Genève, Raoul Behrend
- [https://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets (1)-(5000)] – Minor Planet Center
- {{AstDys|92}}
- {{JPL small body}}
{{Minor planets navigator |91 Aegina |number=92 |93 Minerva}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:Undina}}