1625 The NORC

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1625 The NORC (provisional designation Template:Mp) is a carbonaceous asteroid from the outer region of the asteroid belt, approximately 55 kilometers in diameter. It was discovered on 1 September 1953, by Belgian astronomer Sylvain Arend at the Royal Observatory of Belgium in Uccle, Belgium.[1] It was named after the IBM Naval Ordnance Research Calculator (NORC).[2]

Orbit and classification

The NORC orbits the Sun in the outer main-belt at a distance of 2.5–3.9 AU once every 5 years and 8 months (2,083 days). Its orbit has an eccentricity of 0.23 and an inclination of 16° with respect to the ecliptic.[3] The asteroid was first identified as Template:Mp at Heidelberg Observatory in 1914. Its observation arc begins 24 years prior to its official discovery observation, when it was identified as Template:Mp at Uccle.[1]

Physical characteristics

In the Tholen classification, The NORC is a common carbonaceous C-type asteroid.[3]

Lightcurves

Between 2009 and 2014, five rotational light-curve were obtained of The NORC from photometric observations taken by René Roy, David Higgins and the Palomar Transient Factory. The light-curves gave a rotation period between 12.94 and 18.820 hours with a change in brightness of 0.06 to 0.33 in magnitude (U=+1/2/3-Script error: No such module "Check for unknown parameters".).[4][5][6] The best rated result with a period of 13.959 hours (Δmag 0.16) was obtained by Australian amateur astronomer David Higgins.[7]

Diameter and albedo

According to the surveys carried out by Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, The NORC measures between 44.66 and 75.11 kilometers in diameter, and its surface has an albedo of 0.023 and 0.065.[8][9][10][11][12] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 47.60 kilometers using an absolute magnitude of 10.34.[13]

Naming

This minor planet was named after the IBM Naval Ordnance Research Calculator (NORC), IBM's first-generation vacuum tube computer built in the 1950s (also see List of vacuum tube computers and Template:Section link). NORC was the fastest, most powerful electronic computer of its time. Under the direction of Wallace J. Eckert, after whom the asteroid 1750 Eckert is named, NORC performed a vast amount of orbital calculations for minor planet.[2] The official Template:MoMP was published by the Minor Planet Center in May 1957 (M.P.C. 1591Script error: No such module "Check for unknown parameters".).[14]

References

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  8. ↑ Script error: No such module "Citation/CS1". (online, AcuA catalog p. 153)
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External links

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