• Source: 1760 Sandra

      • 1760 Sandra, provisional designation 1950 GB, is a carbonaceous asteroid from the outer regions of the asteroid belt, approximately 35 kilometers in diameter. It was discovered on 10 April 1950, by South African astronomer Ernest Johnson at Union Observatory in Johannesburg, and named after his granddaughter Sandra.


      Orbit and classification


      Sandra is a carbonaceous C-type asteroid that orbits the Sun in the outer main-belt at a distance of 2.7–3.6 AU once every 5 years and 7 months (2,041 days). Its orbit has an eccentricity of 0.13 and an inclination of 8° with respect to the ecliptic. It was first identified as 1934 NP at the discovering observatory. The body's observation arc begins with its identification as 1935 QH at Heidelberg in 1935, or 15 years prior to its official discovery observation at Johannesburg.


      Lightcurve


      In April 2006, a rotational lightcurve of Sandra was obtained from photometric observations by French amateur astronomer Pierre Antonini. Lightcurve analysis gave a well-defined rotation period of 6.5668 hours with a brightness variation of 0.42 magnitude (U=3).


      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, Sandra measures between 33.989 and 37.71 kilometers in diameter and its surface has an albedo between 0.034 and 0.054. The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0542 and a diameter of 36.03 kilometers with on an absolute magnitude of 11.0.


      Naming


      This minor planet was named by the South African discover Ernest Johnson after his granddaughter Sandra. The official naming citation was published by the Minor Planet Center on 20 February 1976 (M.P.C. 3934).


      References




      External links


      Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
      Dictionary of Minor Planet Names, Google books
      Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
      Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
      1760 Sandra at AstDyS-2, Asteroids—Dynamic Site
      Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
      1760 Sandra at the JPL Small-Body Database

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