1695 Walbeck
{{Use dmy dates|date=October 2019}}
{{Infobox planet
| minorplanet = yes
| name = 1695 Walbeck
| background = #D6D6D6
| image =
| image_size =
| caption =
| discovered = 15 October 1941
| discoverer = L. Oterma
| discovery_site = Turku Obs.
| mpc_name = (1695) Walbeck
| alt_names = 1941 UO{{·}}1964 QA
1964 RE
| named_after = Henrik Walbeck {{small|(geodesist)}}
| mp_category = main-belt{{·}}{{small|(middle)}}
| epoch = 4 September 2017 (JD 2458000.5)
| uncertainty = 0
| observation_arc = 75.44 yr (27,554 days)
| aphelion = 3.5921 AU
| perihelion = 1.9703 AU
| semimajor = 2.7812 AU
| eccentricity = 0.2916
| period = 4.64 yr (1,694 days)
| mean_anomaly = 141.65°
| mean_motion = {{Deg2DMS|0.2125|sup=ms}} / day
| inclination = 16.705°
| asc_node = 218.46°
| arg_peri = 139.42°
| dimensions = {{val|17.88|0.27}} km
{{val|18.953|0.258}} km
19.60 km {{small|(derived)}}
{{val|19.62|0.8}} km
{{val|19.84|0.29}} km
| rotation = {{val|5.16|0.05}} h
{{val|5.1607|0.0006}} h
{{val|5.3}} h
| albedo = {{val|0.037|0.007}}
{{val|0.042|0.006}}
{{val|0.0425|0.0058}}
0.0460 {{small|(derived)}}
{{val|0.0504|0.005}}
{{val|0.051|0.002}}
| spectral_type = SMASS = Cg{{·}}C
| abs_magnitude = 12.4{{·}}12.5{{·}}{{val|12.76|0.23}}{{·}}12.93
}}
1695 Walbeck, provisional designation {{mp|1941 UO}}, is a carbonaceous asteroid from the central region of the asteroid belt, approximately 19 kilometers in diameter. It was discovered on 15 October 1941, by Finnish astronomer Liisi Oterma at Turku Observatory in Southwest Finland, and named after Henrik Walbeck.
Classification and orbit
The asteroid orbits the Sun in the central main-belt at a distance of 2.0–3.6 AU once every 4 years and 8 months (1,694 days). Its orbit has an eccentricity of 0.29 and an inclination of 17° with respect to the ecliptic. Walbeck{{'}}s observation arc begins the night after its official discovery observation.
Physical characteristics
In the SMASS taxonomy, the carbonaceous asteroid is characterized as a Cg-type, an intermediate between the C-type and G-type asteroids.
= Lightcurves =
In November 2006, a rotational lightcurve of Walbeck was obtained from photometric observations by French amateur astronomer Pierre Antonini. It gave a rotation period of 5.1607 hours with a brightness variation of 0.22 magnitude ({{small|U=3}}). Two similar periods were obtained by David Romeuf and by a team of Hungarian astronomers ({{small|U=2/2}}).
= Diameter and albedo =
According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Walbeck measures between 17.88 and 19.62 kilometers in diameter and its surface has an albedo between 0.037 and 0.051. The Collaborative Asteroid Lightcurve Link derives an albedo of 0.046 and a diameter of 19.60 kilometers based on an absolute magnitude of 12.5.
Naming
The minor planet was named in memory of Finnish scientist Henrik Johan Walbeck (1793–1822), astronomer and geodesist at the old Academia Aboensis who used the method of least squares to derive a good value for the Earth's flattening. The official naming citation was published by the Minor Planet Center on 1 April 1980 ({{small|M.P.C. 5281}}).
References
{{reflist
|refs=
|type = 2017-03-24 last obs.
|title = JPL Small-Body Database Browser: 1695 Walbeck (1941 UO)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001695
|publisher = Jet Propulsion Laboratory
|access-date = 6 June 2017}}
|title = Dictionary of Minor Planet Names – (1695) Walbeck
|last = Schmadel | first = Lutz D.
|publisher = Springer Berlin Heidelberg
|page = 135
|date = 2007
|isbn = 978-3-540-00238-3
|doi = 10.1007/978-3-540-29925-7_1696 |chapter = (1695) Walbeck }}
|title = 1695 Walbeck (1941 UO)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=1695
|access-date = 17 December 2016}}
|title = MPC/MPO/MPS Archive
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html
|access-date = 17 December 2016}}
|title = Asteroids and comets rotation curves – (1695) Walbeck
|last = Behrend |first = Raoul
|publisher = Geneva Observatory
|url = http://obswww.unige.ch/~behrend/page4cou.html#001695
|access-date = 17 December 2016}}
|title = LCDB Data for (1695) Walbeck
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1695%7CWalbeck
|access-date = 17 December 2016}}
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|doi = 10.1093/pasj/63.5.1117
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|display-authors = 6
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|display-authors = 6
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|access-date= 17 December 2016}}
}}
External links
- [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|1695}}
- {{JPL small body}}
{{Minor planets navigator |1694 Kaiser |number=1695 |1696 Nurmela}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:001695}}