• Source: 1750 Eckert

1750 Eckert, provisional designation 1950 NA1, is a stony slow rotating Hungaria asteroid and Mars-crosser from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered on 15 July 1950, by German astronomer Karl Reinmuth at Heidelberg Observatory in southern Germany. It was named after American astronomer Wallace Eckert.




Classification and orbit


The Mars crossing asteroid is also a member of the Hungaria family, a group that forms the innermost dense concentration of asteroids in the Solar System. It orbits the Sun at a distance of 1.6–2.3 AU once every 2 years and 8 months (977 days). Its orbit has an eccentricity of 0.17 and an inclination of 19° with respect to the ecliptic. As no precoveries were taken, and no prior identifications were made, Eckert's observation arc begins with its official discovery observation.




Rotation period


In October 2009, a rotational lightcurve of Eckert was obtained by American astronomer Brian Warner at his Palmer Divide Observatory (716) in Colorado. It gave an exceptionally long rotation period of 375 hours with a brightness variation of 0.87 magnitude (U=3-). A modeled lightcurve obtained from the Lowell Photometric Database in 2016, gave a similar period of 377.5 hours (U=n.a.). Eckert has the sixth-longest rotation period of all known Mars-crossers.




Diameter and albedo


According to the survey carried out by the Japanese Akari satellite, the asteroid measures 6.95 kilometers in diameter, and its surface has an albedo of 0.203. The Collaborative Asteroid Lightcurve Link agrees with Akarai and assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 6.97 kilometers with an absolute magnitude of 13.15.




Naming


The minor planet was named in memory of American astronomer Wallace Eckert (1902–1971), director at the United States Naval Observatory from 1940 to 1945, president of IAU's Commission 7, and pioneer in the use of automatic computing machines. In the late 1940s and early 1950s, he used the then most powerful computing machines ever built, SSEC and NORC, for astronomical calculations. The asteroid 1625 The NORC was named after one of these early super-computers. Eckert also produced the integration of the orbits of the five outer planets in collaboration with Brouwer and Clemence, after whom the minor planets 1746 Brouwer and 1919 Clemence were named. By use of sophisticated computing techniques, Eckert was able to check and extend Brown's lunar theory (also see 1643 Brown). The official naming citation was published by the Minor Planet Center on 20 February 1976 (M.P.C. 3934).




References






External links


About NORC: Smartest Brain Joins The Navy (1954) on YouTube (time 0:45 min.)
Lightcurve plot of 1750 Eckert, Palmer Divide Observatory, B. D. Warner (2009)
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
1750 Eckert at AstDyS-2, Asteroids—Dynamic Site
Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
1750 Eckert at the JPL Small-Body Database

Kata Kunci Pencarian:

• Daftar pelukis Jerman
• Daftar kawah di Bulan, C-F
• 1750 Eckert
• 434 Hungaria
• Meanings of minor-planet names: 1001–2000
• Karl Wilhelm Reinmuth
• List of minor planets: 1001–2000
• Hungaria asteroids
• List of slow rotators (minor planets)
• List of Mars-crossing minor planets
• 1751 Herget
• List of named minor planets: E