Opelt (crater)
{{Short description|Crater on the Moon}}
File:Bullialdus centered Si - Aldo Ferruggia.jpg
{{Infobox Lunar crater
| image = Opelt crater 4120 h2.jpg
| image_size =
| caption = Lunar Orbiter 4 image
| coordinates = {{coord|16.3|S|17.5|W|globe:moon_type:landmark|display=inline,title}}
| diameter = 48 km
| depth =
| colong = 17
| eponym = Friedrich W. Opelt and Otto Moritz Opelt
}}
Opelt is the lava-flooded remnant of a lunar impact crater on the Mare Nubium. It lies to the north of a similar formation named Gould and to the northeast of the prominent Bullialdus.
File:Opelt crater AS16-M-2489.jpg, facing south]]
The crater was named after the German astronomers Friedrich Wilhelm Opelt and his son Otto Moritz Opelt.{{cite web|title=Opelt|url=http://planetarynames.wr.usgs.gov/Feature/4472|website=Gazetteer of Planetary Nomenclature|publisher=International Astronomical Union|access-date=19 August 2017}}
Only a slightly raised outline remains of Opelt's rim, the interior having been inundated with lava. The rim has a wide break at the northern end and several smaller breaks to the south and southeast. The satellite crater Opelt E lies at the southern end of the surviving western rim. The interior floor is nearly level, with the exception of a slight rise to the southwest, which is continuous with a wrinkle ridge to the south.
To the north of Opelt on the lunar mare is a sinuous system of rilles designated Rimae Opelt. These occupy a diameter of about 70 kilometers.
Image:Opelt crater AS16-119-19086.jpgImage:Rimae Opelt 4120 h2.jpg
Satellite craters
By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Opelt.
| class="wikitable"
!width="25%" style="background:#eeeeee;" |Opelt !width="25%" style="background:#eeeeee;" |Latitude !width="25%" style="background:#eeeeee;" |Longitude !width="25%" style="background:#eeeeee;" |Diameter |
| align="center"|E
|align="center"|17.0° S |align="center"|17.8° W |align="center"|8 km |
| align="center"|F
|align="center"|18.1° S |align="center"|18.7° W |align="center"|4 km |
| align="center"|G
|align="center"|16.8° S |align="center"|17.2° W |align="center"|4 km |
| align="center"|H
|align="center"|15.8° S |align="center"|17.3° W |align="center"|3 km |
| align="center"|K
|align="center"|13.6° S |align="center"|17.1° W |align="center"|5 km |
References
{{Reflist}}
{{refbegin}}
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| last1 = Andersson
| first1 = L. E.
| last2 = Whitaker
| first2 = E. A.
| authorlink2 = Ewen Whitaker
| date = 1982
| title = NASA Catalogue of Lunar Nomenclature
| publisher = NASA RP-1097
}}
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| last1 = Bussey
| first1 = B.
| authorlink1 = Ben Bussey
| last2 = Spudis
| first2 = P.
| authorlink2 = Paul Spudis
| date = 2004
| title = The Clementine Atlas of the Moon
| publisher = Cambridge University Press
| location = New York
| isbn = 978-0-521-81528-4
}}
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| last1 = Cocks
| first1 = Elijah E.
| last2 = Cocks
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| date = 1995
| title = Who's Who on the Moon: A Biographical Dictionary of Lunar Nomenclature
| publisher = Tudor Publishers
| isbn = 978-0-936389-27-1
| url = https://archive.org/details/isbn_9780936389271
}}
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| last = McDowell
| first = Jonathan
| date = July 15, 2007
| url = http://host.planet4589.org/astro/lunar/
| title = Lunar Nomenclature
| publisher = Jonathan's Space Report
| access-date = 2007-10-24
}}
- {{cite journal| last1 = Menzel| first1 = D. H.| last2 = Minnaert| first2 = M.| last3 = Levin| first3 = B.| last4 = Dollfus| first4 = A.| last5 = Bell| first5 = B.| title = Report on Lunar Nomenclature by the Working Group of Commission 17 of the IAU| doi = 10.1007/BF00171763| journal = Space Science Reviews| volume = 12| issue = 2| pages = 136–186| date = 1971| bibcode = 1971SSRv...12..136M| s2cid = 122125855}}
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| first = Patrick
| last = Moore
| authorlink = Patrick Moore
| date = 2001
| title = On the Moon
| publisher = Sterling Publishing Co.
| isbn = 978-0-304-35469-6
| url = https://archive.org/details/patrickmooreonmo00patr
}}
- {{cite book
| first = Fred W.
| last = Price
| date = 1988
| title = The Moon Observer's Handbook
| publisher = Cambridge University Press
| isbn = 978-0-521-33500-3
}}
- {{cite book
| last = Rükl
| first = Antonín
| authorlink = Antonín Rükl
| date = 1990
| title = Atlas of the Moon
| publisher = Kalmbach Books
| isbn = 978-0-913135-17-4
}}
- {{cite book
| last = Webb
| first = Rev. T. W.
| authorlink = Thomas William Webb
| date = 1962
| title = Celestial Objects for Common Telescopes
| edition = 6th revised
| publisher = Dover
| isbn = 978-0-486-20917-3
| url = https://archive.org/details/celestialobjects00webb
}}
- {{cite book
| first = Ewen A.
| last = Whitaker
| authorlink = Ewen Whitaker
| date = 1999
| title = Mapping and Naming the Moon
| publisher = Cambridge University Press
| isbn = 978-0-521-62248-6
}}
- {{cite book
| first = Peter T.
| last = Wlasuk
| date = 2000
| title = Observing the Moon
| publisher = Springer
| isbn = 978-1-85233-193-1
}}
{{refend}}
External links
- [https://the-moon.us/wiki/Opelt Opelt at The Moon Wiki]
- {{Commons category-inline}}