1192 Prisma

Prisma is a member of the Phocaea family ({{small|701}}), a prominent family of S-type asteroids with their largest members being 25 Phocaea and 587 Hypsipyle. There are many Mars-crossers among this family of relatively eccentric inner main-belt asteroids .

The asteroid orbits the Sun at a distance of 1.8–3.0 AU once every 3 years and 8 months (1,329 days). Its orbit has an eccentricity of 0.26 and an inclination of 24° with respect to the ecliptic. The body's observation arc begins at Bergedorf, one week after its official discovery observation.

Photometric observations of Prisma gave a well defined rotational lightcurve with a period between 6.546 and 6.558 hours and a high brightness variation of 0.85–1.16 magnitude, which strongly indicates that the body has an elongated, non-spheroidal shape ({{small|U=3/3}}).

A modeled lightcurve based on optical data from a large collaboration network also found a spin axis of (133.0°, −78.0°) in ecliptic coordinates (λ, β) ({{small|Q=n.a.}}).

According to the surveys carried out by the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Prisma measures between 7.38 and 9.27 kilometers in diameter and its surface has an albedo between 0.144 and 0.220. The Collaborative Asteroid Lightcurve Link assumes a standard albedo of 0.23 and calculates a diameter of 7.22 kilometers based on an absolute magnitude of 12.92.

This minor planet was named "Prisma" (prism) in honour of the Bergedorf Spectral Catalogue ({{langx|de|Bergedorfer Spektralkatalog}}), as prisms are one method of obtaining spectra. The official naming citation was also published in Paul Herget's The Names of the Minor Planets in 1955 ({{small|H 111}}).

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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 }})
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• {{AstDys|1192}}
• {{JPL small body}}

{{Minor planets navigator |1191 Alfaterna |number=1192 |1193 Africa}}

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{{DEFAULTSORT:Prisma}}

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Category:Discoveries by Friedrich Karl Arnold Schwassmann

Category:Named minor planets

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