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Lat: 11.53°S, Long: 52.01°W, Diam: 44.99 km, Depth: 1.39 km, Rükl: 40

external image normal_Arrowhead%20Billy%20Hansteen%20iv_149_h2%20.jpg
Lunar Orbiter IV image IV-149-H2, Hansteen Alpha aka Mons Hansteen or the Arrowhead, Billy & Hansteen (upper left).


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(IAU Directions) HANSTEEN.--A somewhat larger ring-plain, with a lower and more irregular rampart, rising on the E. to nearly 3,000 feet above the floor, which is depressed to about the same extent as that of Billy. Both the inner and outer slopes are terraced on the W., where the glacis is traversed by a short, delicate, rill-like valley. There are some bright curved ridges on the floor. On the E. of Billy and Hansteen is a wide inlet of the Oceanus Procellarum, bounded by the Letronne region on the E., and on the S. by lofty highlands. On the surface, not far from the S.E. border of Hansteen, is a curious triangular-shaped mountain mass, with a digitated outline on the S., and including a small bright crater on its area. Between this and the ring- plain is a large but somewhat obscure depression, N. of which lies a rill-like object extending from the N. point of the triangular mountain to the E. wall. At the bottom of a gently sloping valley between Billy and Hansteen is a de
licate marking, which seems to represent a cleft connecting the two formations.



Additional Information


  • Christopher; Norwegian astronomer (1784-1873).
  • A Reiner-gamma like surface formation (a swirl) north-northwest of Hansteen (at 7 degrees South, 54 degrees West) was probably called Burrell by Wilkins, and Melloni by Schmidt.
  • Burrell-Melloni - a curious case of observation


Left: The feature as it appears in Schmidt's map Sheet No. 19.

Middle left: As it appears in Wilkins's Map - Chart XIX.

Middle right: Annotated, Lunar Orbiter 4 LO4-H3-4156 aerial view (square shows the region in question as it is seen today - considered by Schmidt as Melloni crater and by Wilkins as Burrell crater).

Right: Annotated, Digital Elevation Model (DEM) view under low illumination using LTVT software as a projection method to show approximately the region where Burrell-Melloni was presumed seen.

Click image for larger view

  • Note: For all images, North is to bottom, East to left (taking into account the pre-1961 cardinal-point changes - see IAU Directions).
  • Clearly Schmidt and Wilkins show the feature as a well-marked crater, however, when looked for in the Mädler maps of 1837 and the Neison maps of 1876 Map 12, the feature doesn't appear (Mädler shows it as two small ridge-like or hill-like features, while nothing at all appears on Neison's). Other, more recent mappers have also commented about the feature's appearance/disappearance, which further confused matters, for example, see this 1959 Irish Astronomical Journal article by Larson Milling. - JohnMoore2 ??
  • Burrell was a contemporary English selenographer.
  • Rimae Hansteen (an unofficial name for the system of rilles on the floor of Hansteen).

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Named Features -- Prev: Hansen -- Next: Mons Hansteen