Chappe (crater)

Chappe
	Lunar Orbiter 4 image
Coordinates	61°17′S 91°14′W / 61.29°S 91.24°W
Diameter	55.79 km (34.67 mi)
Depth	Unknown
Colongitude	93° at sunrise
Eponym	J.-B. Chappe d'Auteroche

Chappe is a degraded lunar impact crater that lies along the southwestern limb of the Moon. It is nearly attached to the northern limb of the walled plain designated Hausen,^[2] and an equal distance from the crater Pilâtre to the northeast. To the north-northwest is Blanchard.^[3] Chappe lies to the south of the Mendel-Rydberg Basin, a 630 km wide impact basin of Nectarian age.

This crater lies along the outer rampart of the much larger Hausen, and is surrounded by uneven, hummocky terrain. The rim is roughly circular, with a small crater lying along the eastern edge^[4] – this feature includes a permanently shadowed region.^[5] The inner walls and interior floor are uneven, particularly in the western half.^[4]

Originally designated Hausen A,^[4] this crater is named after French astronomer J.-B. Chappe d'Auteroche (1728-1769). He is best known for his observations of the transits of Venus in 1761 and 1769.^[6]^[2] Its designation was officially adopted by the International Astronomical Union in 1994.^[1]

References

1 2 "Chappe". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program.
1 2 Jones, Brian (2024). Who's Who In The Moon: From Abbot to Zupus A Guide To The Moon And The People On It. White Owl. p. 162. ISBN 978-1-5267-3710-6.
↑ "LAC 135" (PDF). Gazeteer of Planetary Nomenclature. Retrieved 2026-07-02.
1 2 3 Bussey, B.; Spudis, P. (2004). The Clementine Atlas of the Moon. New York: Cambridge University Press. p. 135. ISBN 978-0-521-81528-4.
↑ McGovern, J. Andrew; et al. (March 2013). "Mapping and characterization of non-polar permanent shadows on the lunar surface". Icarus. 223 (1): 566–581. Bibcode:2013Icar..223..566M. doi:10.1016/j.icarus.2012.10.018.
↑ Baum, R. (2014). "Chappe d'Auteroche, Jean-Baptiste". In Hockey, T.; et al. (eds.). Biographical Encyclopedia of Astronomers. New York, NY: Springer. doi:10.1007/978-1-4419-9917-7_266.

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.

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

[Jones_2024-2] 1 2 Jones, Brian (2024). Who's Who In The Moon: From Abbot to Zupus A Guide To The Moon And The People On It. White Owl. p. 162. ISBN 978-1-5267-3710-6.

[LAC-135-3] "LAC 135" (PDF). Gazeteer of Planetary Nomenclature. Retrieved 2026-07-02.

[Bussey_Spudis_2004-4] 1 2 3 Bussey, B.; Spudis, P. (2004). The Clementine Atlas of the Moon. New York: Cambridge University Press. p. 135. ISBN 978-0-521-81528-4.

[McGovern_et_al_2013-5] McGovern, J. Andrew; et al. (March 2013). "Mapping and characterization of non-polar permanent shadows on the lunar surface". Icarus. 223 (1): 566–581. Bibcode:2013Icar..223..566M. doi:10.1016/j.icarus.2012.10.018.

[Hockey_et_al_2014-6] Baum, R. (2014). "Chappe d'Auteroche, Jean-Baptiste". In Hockey, T.; et al. (eds.). Biographical Encyclopedia of Astronomers. New York, NY: Springer. doi:10.1007/978-1-4419-9917-7_266.

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