Ansgarius (crater)

Ansgarius
	Apollo 15 image
Coordinates	12°55′S 79°43′E / 12.92°S 79.72°E
Diameter	91.42 km (56.81 mi)
Depth	2.2 km
Colongitude	181° at sunrise
Formation	Imbrian
Eponym	St. Ansgar

Ansgarius is a lunar impact crater that is located near the eastern limb of the Moon. When viewed from the Earth, the crater has a highly oval shape due to foreshortening, but the rim is actually nearly circular. To the northwest of Ansgarius is the crater La Pérouse, and south is Behaim.^[3]

This formation dates to the Imbrian period on the lunar geologic timescale.^[2] The rim of Ansgarius is not significantly worn, and has a terraced interior surface. The southwest rim appears somewhat flattened rather than round, and intrudes into an older formation of which little remains except the western rim. There is an outward notch in the north-northeastern wall. The interior floor of Ansgarius is relatively flat, with only tiny craterlets to mark the surface.^[4]^: 61

This crater was named after the German theologian Ansgar (801-864), a 9th-century Benedictine missionary monk who brought Catholicism to northern Germany and Scandinavia, known as the "Apostle of the North". Its designation was formerly approved by the IAU in 1935.^[1] The name was introduced into lunar nomenclature by German astronomer Johann Mädler during the 19th century.^[5]

Satellite craters

By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Ansgarius.^[6]

Ansgarius^[4]^: 291	Latitude	Longitude	Diameter
B	11.9° S	83.8° E	29 km
C	14.8° S	74.8° E	14 km
M	11.3° S	78.8° E	7 km
N	11.9° S	81.2° E	10 km
P	13.0° S	75.9° E	10 km

References

1 2 "Ansgarius". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program.
1 2 Kirchoff, Michelle R.; et al. (July 2013). "Ages of large lunar impact craters and implications for bombardment during the Moon's middle age". Icarus. 225 (1): 325–341. Bibcode:2013Icar..225..325K. doi:10.1016/j.icarus.2013.03.018. USGS epoch.
↑ Moore, Patrick (2001). On the Moon. Sterling Publishing Co. p. 219–221. ISBN 978-0-304-35469-6.
1 2 Bussey, B.; Spudis, P. (2004). The Clementine Atlas of the Moon. New York: Cambridge University Press. p. 291. ISBN 978-0-521-81528-4.
↑ Whitaker, Ewen A. (1999). Mapping and Naming the Moon. Cambridge University Press. pp. 120–122, 219. ISBN 978-0-521-62248-6.
↑ Grego, P. (2015). "Satellite Crater". In Hargitai, H.; Kereszturi, Á. (eds.). Encyclopedia of Planetary Landforms. New York, NY: Springer. doi:10.1007/978-1-4614-3134-3_328.

Sources

Price, Fred W. (1988). The Moon Observer's Handbook. Cambridge University Press. ISBN 978-0-521-33500-3.
Rükl, Antonín (1990). Atlas of the Moon. Kalmbach Books. ISBN 978-0-913135-17-4.
Wlasuk, Peter T. (2000). Observing the Moon. Springer. ISBN 978-1-85233-193-1.

External links

Media related to Ansgarius (crater) at Wikimedia Commons

[GPN-1] 1 2 "Ansgarius". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program.

[Kirchoff_et_al_2013-2] 1 2 Kirchoff, Michelle R.; et al. (July 2013). "Ages of large lunar impact craters and implications for bombardment during the Moon's middle age". Icarus. 225 (1): 325–341. Bibcode:2013Icar..225..325K. doi:10.1016/j.icarus.2013.03.018. USGS epoch.

[Moore_2001-3] Moore, Patrick (2001). On the Moon. Sterling Publishing Co. p. 219–221. ISBN 978-0-304-35469-6.

[Bussey_Spudis_2004-4] 1 2 Bussey, B.; Spudis, P. (2004). The Clementine Atlas of the Moon. New York: Cambridge University Press. p. 291. ISBN 978-0-521-81528-4.

[Whitaker_1999-5] Whitaker, Ewen A. (1999). Mapping and Naming the Moon. Cambridge University Press. pp. 120–122, 219. ISBN 978-0-521-62248-6.

[Grego_2015-6] Grego, P. (2015). "Satellite Crater". In Hargitai, H.; Kereszturi, Á. (eds.). Encyclopedia of Planetary Landforms. New York, NY: Springer. doi:10.1007/978-1-4614-3134-3_328.

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