(35671) 1998 SN165

{{mp|1998 SN|165}} orbits the Sun at a distance of 36.5–39.7 AU once every 234 years and 9 months (85,755 days; semi-major axis of 38.06 AU). Its orbit has an eccentricity of 0.04 and an inclination of 5° with respect to the ecliptic. {{As of|2021}} the object is at 37.2 AU, approaching the Sun until 15 July 2065, when it will come to perihelion.{{efn|name=perihelion}} The body's observation arc begins at Kitt Peak in September 1998, just eight nights prior to its official discovery observation.

As a cubewano, also known as classical Kuiper belt object, {{mp|1998 SN|165}} is located in between the resonant plutino and twotino populations and has a low-eccentricity orbit. It belongs to the cold population, distinct from the "stirred" hot population with inclinations higher than 5°. In a previous publication, the object was originally classified as a plutino.

This minor planet was numbered by the Minor Planet Center on 27 February 2002 and received the number {{LoMP|35671|35671}} in the minor planet catalog ({{small|M.P.C. 44869}}). {{As of|2021}}, it has not been named. According to the established naming conventions, it will receive a mythological or mythic name (not necessarily from Classical mythology), in particular one associated with creation.

{{mp|1998 SN|165}} has a blue-grey color (BB), with various color indices measured, giving a difference between the blue and red filter magnitude (BR) of 1.123 and 1.13, respectively.

In February 2001, a rotational lightcurve of {{mp|1998 SN|165}} was obtained from photometric observations by Pedro Lacerda and Jane Luu. Lightcurve analysis gave an ambiguous rotation period of 8.84 hours with a brightness amplitude of 0.16 magnitude ({{small|U=2}}). An alternative period of 8.70 hours is also possible.

According to observations by the space-based Herschel and Spitzer telescopes, {{mp|1998 SN|165}} measures between 393 and 460 kilometers and its surface has a low albedo between 0.043 and 0.060. While Johnston's Archive adopts a diameter of 393 kilometers, astronomer Michael Brown gives a radiometric diameter of 473 kilometers and lists this object as a "probable" dwarf planet (400–500 km), which is the category with the second lowest certainty in his 5-class taxonomic system. The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.10 and calculates a diameter of 334 kilometers based on an absolute magnitude of 5.5. A generic magnitude-to-diameter conversion with an albedo of 0.9 gives a diameter of 352 kilometers.

{{notelist|refs=

{{efn|name=perihelion|1=[http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=1998SN165 JPL Horizons] Observer Location: @sun (Perihelion occurs when deldot changes from negative to positive. Uncertainty in time of perihelion is 3-sigma, ±9 days.)}}

}}

{{reflist|30em|refs=

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• [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://www.boulder.swri.edu/~buie/kbo/desclass.html The Deep Ecliptic Survey Object Classifications]
• [https://www.minorplanetcenter.net/iau/mpec/K06/K06X45.html MPEC 2006-X45 : DISTANT MINOR PLANETS (2006 DEC. 21.0 TT)], Minor Planet Electronic Circular
• [https://minorplanetcenter.net/iau/lists/TNOs.html List of Transneptunian Objects], Minor Planet Center
• [https://www.minorplanetcenter.net/iau/lists/NumberedMPs035001.html Discovery Circumstances: Numbered Minor Planets (35001)-(40000)] – Minor Planet Center
• {{AstDys|35671}}
• {{JPL small body}}

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035671

Category:Discoveries by Arianna E. Gleason

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