1306 Scythia
{{Short description|Dark Ursula asteroid from the outer regions of the asteroid belt}}
{{About|dark Ursula asteroid|others|Scythia (disambiguation)}}
{{Use dmy dates|date=October 2019}}
{{Infobox planet
| minorplanet = yes
| name = 1306 Scythia
| background = #D6D6D6
| image =
| image_size =
| caption =
| discoverer = G. Neujmin
| discovery_site = Simeiz Obs.
| discovered = 22 July 1930
| mpc_name = (1306) Scythia
| alt_names = 1930 OB{{·}}1933 DN
1935 OA{{·}}1951 JB
{{mp|1956 EM|1}}{{·}}1957 KQ
| pronounced = {{IPAc-en|ˈ|s|ɪ|θ|i|ə|,_|ˈ|s|ɪ|ð|i|ə}}{{OED|Scythian}}
| named_after = Scythia {{small|(Historic region)}}
| mp_category = main-belt{{·}}{{small|(outer)}}
Ursula
| epoch = 4 September 2017 (JD 2458000.5)
| uncertainty = 0
| observation_arc = 86.94 yr (31,756 days)
| aphelion = 3.4451 AU
| perihelion = 2.8533 AU
| semimajor = 3.1492 AU
| eccentricity = 0.0940
| period = 5.59 yr (2,041 days)
| mean_anomaly = 142.14°
| mean_motion = {{Deg2DMS|0.1764|sup=ms}} / day
| inclination = 14.935°
| asc_node = 274.24°
| arg_peri = 139.44°
| dimensions = {{val|66.780|0.710}} km
{{val|67.14|4.4}} km
{{val|72.95|20.42}} km
{{val|73.53|20.87}} km
{{val|77.708|1.662}} km
{{val|83.65|1.41}} km
| rotation = {{val|7.525|0.001}} h
{{val|15.05|0.01}} h
| albedo = {{val|0.034|0.001}}
{{val|0.035|0.003}}
{{val|0.0382|0.0057}}
{{val|0.05|0.03}}
{{val|0.05|0.04}}
{{val|0.0512|0.007}}
{{val|0.052|0.006}}
| spectral_type = Tholen {{=}} S
B–V {{=}} 0.853
U–B {{=}} 0.398
| abs_magnitude = {{val|9.51|0.24}}{{·}}9.64{{·}}9.71
}}
1306 Scythia, provisional designation {{mp|1930 OB}}, is a dark Ursula asteroid from the outer regions of the asteroid belt, approximately 72 kilometers in diameter. It was discovered on 22 July 1930, by Soviet astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula. The asteroid was named for the historic region of Scythia.
Orbit and classification
Scythia is a member of the Ursula family ({{small|631}}), a mid-sized asteroid family in the outer main-belt.{{rp|23}} It orbits the Sun at a distance of 2.9–3.4 AU once every 5 years and 7 months (2,041 days; semi-major axis of 3.15 AU). Its orbit has an eccentricity of 0.09 and an inclination of 15° with respect to the ecliptic. The body's observation arc begins with its official discovery observation at Simeiz in July 1930.
Physical characteristics
In the Tholen classification, Scythia is a stony S-type asteroid, unlike the overall spectral type of the Ursula family which is that of a C- and X-type.{{rp|23}}
= Rotation period =
In September 2003, a rotational lightcurve of Scythia was obtained from photometric observations by Robert Stephens at the Santana Observatory in California. Lightcurve analysis gave a rotation period of 15.05 hours with a brightness variation of 0.15 magnitude ({{small|U=2}}). In August 2008, Pierre Antonini measured a better period solution of 7.525 hours (or half the period) and an amplitude of 0.25 magnitude ({{small|U=3}}).
= Diameter and albedo =
According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Scythia measures between 66.780 and 83.65 kilometers in diameter and its surface has a low albedo between 0.034 and 0.052.
The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0512 and a diameter of 67.14 kilometers based on an absolute magnitude of 9.71.
Naming
This minor planet was named after the ancient region of Scythia, located east of the Black Sea. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 ({{small|H 119}}).
References
{{reflist|30em|refs=
|type = 2017-07-01 last obs.
|title = JPL Small-Body Database Browser: 1306 Scythia (1930 OB)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001306
|publisher = Jet Propulsion Laboratory
|accessdate = 19 December 2017}}
|last = Schmadel | first = Lutz D.
|title = Dictionary of Minor Planet Names |publisher = Springer Berlin Heidelberg
|page = 107
|date = 2007
|isbn = 978-3-540-00238-3
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|title = 1306 Scythia (1930 OB)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=1306
|accessdate = 19 December 2017}}
|title = Asteroids and comets rotation curves – (1306) Scythia
|last = Behrend |first = Raoul
|publisher = Geneva Observatory
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|accessdate = 19 December 2017}}
|display-authors = 6
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|first3 = A. K. |last3 = Mainzer
|first4 = C. R. |last4 = Nugent
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|title = Asteroid 1306 Scythia – Nesvorny HCM Asteroid Families V3.0
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|title = LCDB Data for (1306) Scythia
|publisher = Asteroid Lightcurve Database (LCDB)
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|display-authors = 6
|first1 = Joseph R. |last1 = Masiero
|first2 = A. K. |last2 = Mainzer
|first3 = T. |last3 = Grav
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|date = November 2012
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|display-authors = 6
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|date = November 2011
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|display-authors = 6
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|first2 = A. |last2 = Mainzer
|first3 = J. |last3 = Masiero
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|display-authors = 6
|first1 = Peter |last1 = Veres
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|first4 = Larry |last4 = Denneau
|first5 = Mikael |last5 = Granvik
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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|1306}}
- {{JPL small body}}
{{Minor planets navigator |1305 Pongola |number=1306 |1307 Cimmeria}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:Scythia}}