1623 Vivian
{{Short description|Main-belt asteroid}}
{{Use dmy dates|date=October 2019}}
{{Infobox planet
| minorplanet = yes
| name = 1623 Vivian
| background = #D6D6D6
| image = 001623-asteroid shape model (1623) Vivian.png
| image_scale =
| caption = Shape model of Vivian from its lightcurve
| discovered = 9 August 1948
| discoverer = Ernest Johnson
| discovery_site = Johannesburg Obs.
| mpc_name = (1623) Vivian
| alt_names = 1948 PL{{·}}{{mp|1951 EG|2}}
1954 SA{{·}}1955 YC
1960 WP{{·}}1965 QB
1965 UW{{·}}1973 GG
| named_after = Vivian Hirst
{{small|(daughter of an astronomer)}}
| mp_category = main-belt{{·}}Themis
| epoch = 4 September 2017 (JD 2458000.5)
| uncertainty = 0
| observation_arc = 68.64 yr (25,070 days)
| aphelion = 3.6317 AU
| perihelion = 2.6542 AU
| semimajor = 3.1429 AU
| eccentricity = 0.1555
| period = 5.57 yr (2,035 days)
| mean_anomaly = 72.044°
| mean_motion = {{Deg2DMS|0.1769|sup=ms}} / day
| inclination = 2.4903°
| asc_node = 115.62°
| arg_peri = 316.97°
| dimensions = {{val|24.77|6.52}} km
25.82 km {{small|(calculated)}}
{{val|27.851|0.351}} km
{{val|29.98|1.74}} km
| rotation = {{val|20.5209|0.0007}} h
{{val|20.5235}} h
| albedo = {{val|0.075|0.012}}
{{val|0.078|0.010}}
0.08 {{small|(assumed)}}
{{val|0.08|0.07}}
| spectral_type = C
| abs_magnitude = 11.00{{·}}11.20{{·}}11.24{{·}}{{val|11.26|0.22}}{{·}}11.3
}}
1623 Vivian (provisional designation {{mp|1948 PL}}) is a carbonaceous Themis asteroid from the outer region of the asteroid belt, approximately 25 kilometers in diameter. It was discovered on 9 August 1948, by South African astronomer Ernest Johnson at Johannesburg Observatory in South Africa. It was named after Vivian Hirst, daughter of British astronomer William P. Hirst.
Orbit and classification
Vivian is a C-type asteroid and member of the Themis family, a large family of asteroids with nearly coplanar ecliptical orbits. It orbits the Sun in the outer main-belt at a distance of 2.7–3.6 AU once every 5 years and 7 months (2,035 days). Its orbit has an eccentricity of 0.16 and an inclination of 2° with respect to the ecliptic. Vivian's observation arc begins with its official discovery observation, as no precoveries were taken, and no prior identifications were made.
Rotation period and pole
In March 2006, a rotational lightcurve of Vivian was obtained by American astronomer Lawrence Molnar at the Calvin–Rehoboth Observatory in New Mexico. It gave it a rotation period of 20.5209 hours with a brightness variation of 0.85 magnitude ({{small|U=3-}}). Modeled lightcurve data gave a concurring period of 20.5235 hours ({{small|U=n.a.}}).
Diameter and albedo
According to the surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Vivian measures between 24.77 and 29.98 kilometers in diameter, and its surface has an albedo between 0.075 and 0.08. The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.08 and calculates a diameter of 25.82 kilometers with an absolute magnitude of 11.3.
Naming
This minor planet was named in honor of Vivian Hirst, daughter of British astronomer William P. Hirst, receiver of the Astronomical Society of Southern Africa's Gill Medal and after whom the minor planet 3172 Hirst is named. Hirst calculated the preliminary orbit for this and several other minor planets discovered by Ernest Johnson. The official {{MoMP|1623|naming citation}} was published by the Minor Planet Center on 1 January 1974 ({{small|M.P.C. 3569}}).
References
{{reflist|refs=
|type = 2017-03-30 last obs.
|title = JPL Small-Body Database Browser: 1623 Vivian (1948 PL)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001623
|publisher = Jet Propulsion Laboratory
|accessdate = 30 June 2017}}
|title = Dictionary of Minor Planet Names – (1623) Vivian
|last = Schmadel | first = Lutz D.
|publisher = Springer Berlin Heidelberg
|page = 129
|date = 2007
|isbn = 978-3-540-00238-3
|doi = 10.1007/978-3-540-29925-7_1624 |chapter = (1623) Vivian }}
|title = 1623 Vivian (1948 PL)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=1623
|accessdate = 28 December 2016}}
|title = Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008)
|year = 2009
|url = https://archive.org/details/dictionaryminorp2008schm
|url-access = limited
|chapter = Appendix – Publication Dates of the MPCs
|last = Schmadel |first=Lutz D.
|publisher = Springer Berlin Heidelberg
|page = [https://archive.org/details/dictionaryminorp2008schm/page/n230 221]
|isbn = 978-3-642-01964-7
|doi = 10.1007/978-3-642-01965-4|bibcode = 2009dmpn.book.....S
}}
|title = LCDB Data for (1623) Vivian
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1623%7CVivian
|accessdate = 28 December 2016}}
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|doi-access=
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|doi-access = free }}
|display-authors = 6
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}}
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|1623}}
- {{JPL small body}}
{{Minor planets navigator |1622 Chacornac |number=1623 |1624 Rabe}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:Vivian}}