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1632 Sieböhme

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Discovered by
  
K. Reinmuth

MPC designation
  
1632 Sieböhme

Discovered
  
26 February 1941

Orbits
  
Sun

Asteroid group
  
Asteroid belt

Discovery date
  
26 February 1941

Minor planet category
  
main-belt · (middle)

Absolute magnitude
  
11.7

Discoverer
  
Karl Wilhelm Reinmuth

Named after
  
Siegfried Böhme (astronomer)

Alternative names
  
1941 DF · 1930 UJ 1942 JC · 1947 RB 1951 MN · 1956 TM A917 SO

Discovery site
  
Landessternwarte Heidelberg-Königstuhl

Similar
  
1862 Apollo, Sun, 1419 Danzig, 1056 Azalea, 1111 Reinmuthia

1632 Sieböhme, provisional designation 1941 DF, is an asteroid and relatively slow rotator from the middle region of the asteroid belt, approximately 27 kilometers in diameter. It was discovered on 26 February 1941, by German astronomer Karl Reinmuth at Heidelberg Observatory in southern Germany.

Sieböhme orbits the Sun at a distance of 2.3–3.0 AU once every 4 years and 4 months (1,581 days). Its orbit has an eccentricity of 0.14 and an inclination of 6° with respect to the ecliptic. In 1907, the body was first identified as A917 SO at the Crimean Simeis Observatory, extending its observation arc by 34 years prior to its official discovery observation.

In August 2012, two rotational light-curves of Sieböhme were obtained at the Palomar Transient Factory in California, and by Italian astronomer Albino Carbognani. These light-curves gave a rotation period of 56.8129 and 56.81 hours with a brightness variation of 0.44 and 0.45 magnitude, respectively (U=2/2). One month later, photometric observations by amateur astronomer Pierre Antonini gave a period of 56.65 hours and an amplitude of 0.47 magnitude (U=2). As most minor planets rotate within 2 to 20 hours around their axis, Sieböhme is a relatively slow rotator.

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Sieböhme measures between 25.16 and 29.38 kilometers in diameter, and its surface has an albedo between 0.043 and 0.064. The Collaborative Asteroid Lightcurve Link (CALL) derives an albedo of 0.0477 and a diameter of 26.56 kilometers based on an absolute magnitude of 11.80. Although CALL derives an albedo that is darker than that of a carbonaceous asteroid, it classifies Sieböhme as a stony asteroid.

This minor planet was named in honor of German astronomer Siegfried Böhme (1909–1996), staff member at Astronomisches Rechen-Institut in Heidelberg since 1949. He improved upon the orbital elements of many asteroids, in particular upon 919 Ilsebill. Naming citation was published before November 1977 (M.P.C. 3931).

References

1632 Sieböhme Wikipedia