1906 Naef
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1906 Naef (prov. designation:Template:Mp) is a stony vestoid asteroid from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered on 5 September 1972, by Swiss astronomer Paul Wild at Zimmerwald Observatory near Bern, Switzerland.[1] It was later named after Swiss banker and amateur astronomer Robert A. Naef.[2]
Orbit and classification
Naef orbits the Sun in the inner main-belt at a distance of 2.1–2.7 AU once every 3 years and 8 months (1,335 days). Its orbit has an eccentricity of 0.14 and an inclination of 6° with respect to the ecliptic.[3] The body's observation arc begins with its official discovery observation at Zimmerwald, as previous observation at Turku Observatory (Template:Mp) and McDonald Observatory (Template:Mp) in 1943 and 1952, respectively, remain unused.[1]
Physical characteristics
According to observations by the Wide-field Infrared Survey Explorer's NEOWISE mission, Naef measures 7.9 and 8.1 kilometers in diameter, and its surface has an albedo of 0.23,[4][5] while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.40 and calculates a diameter of 6.6 kilometer with an absolute magnitude of 12.5.[6]
Naef is a vestoid or V-type asteroid, with its spectral type comparable to that of the group's namesake, 4 Vesta. V-type asteroids are less common than the abundant S-type asteroids, but they are similar in their stony composition, except for their higher concentration of pyroxenes, an aluminium-rich silicate mineral. PanSTARRSTemplate:' photometric survey has characterized it as a SQ-type that transitions to the Q-type asteroids.[7]
Four rotational lightcurves, obtained during 2005–2009, gave a well-defined rotation period between 11.01 and 11.03 hours, and a brightness variation of 0.92–0.95 magnitude (U=n.a./3/n.a./2+Script error: No such module "Check for unknown parameters".).[8][9][10]Template:Efn
Naming
This minor planet was named after Swiss banker Robert A. Naef (1907–1975) from Zürich, an ardent amateur astronomer, who produced the yearly observers almanac, Der Sternenhimmel, since 1940.[2] The official Template:MoMP was published by the Minor Planet Center on 18 April 1977 (M.P.C. 4157Script error: No such module "Check for unknown parameters".).[11]
Notes
References
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External links
- The Robert A. Naef Foundation
- Asteroid Lightcurve Database (LCDB), query form (info Template:Webarchive)
- 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
- Template:AstDys
- Template:PAGENAMEBASE at the JPL Small-Body DatabaseTemplate:EditAtWikidata
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