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Coordinates: 13°48′S 50°06′W / 13.8°S 50.1°W

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Billy
Lunar Orbiter 4 image (spots at upper right are blemishes on original)
Coordinates	13°48′S 50°06′W / 13.8°S 50.1°W / -13.8; -50.1
Diameter	45 km
Depth	1.2 km
Colongitude	50° at sunrise
Eponym	Jacques de Billy

Billy is a lunar impact crater that is located at the southern fringes of the Oceanus Procellarum, in the western hemisphere of the Moon. It was named after French mathematician Jacques de Billy.^[1] It lies to the southeast of the similar-sized crater Hansteen, and west-southwest of the flooded Letronne.

The interior floor of Billy has been flooded by basaltic lava, leaving a dark surface due to the low albedo. The portion of the rim remaining above the surface is narrow and low, with a thin inner wall. Only a few tiny craterlets mark the interior.

To the north of the crater is a triangular mountainous formation named Mons Hansteen, from the nearby crater. Southeast of Billy is a rille, designated Rima Billy, that runs 70 kilometers to the south.

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 Billy.

Billy	Latitude	Longitude	Diameter
A	14.3° S	46.3° W	7 km
B	12.2° S	47.6° W	25 km
C	16.1° S	49.0° W	6 km
D	14.9° S	48.3° W	11 km
E	15.0° S	49.6° W	2 km
H	15.6° S	49.6° W	3 km
K	12.9° S	48.7° W	4 km

References

^ "Billy (crater)". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program.

Andersson, L. E.; Whitaker, E. A. (1982). NASA Catalogue of Lunar Nomenclature. NASA RP-1097.
Bussey, B.; Spudis, P. (2004). The Clementine Atlas of the Moon. New York: Cambridge University Press. ISBN 978-0-521-81528-4.
Cocks, Elijah E.; Cocks, Josiah C. (1995). Who's Who on the Moon: A Biographical Dictionary of Lunar Nomenclature. Tudor Publishers. ISBN 978-0-936389-27-1.
McDowell, Jonathan (July 15, 2007). "Lunar Nomenclature". Jonathan's Space Report. Retrieved 2007-10-24.
Menzel, D. H.; Minnaert, M.; Levin, B.; Dollfus, A.; Bell, B. (1971). "Report on Lunar Nomenclature by the Working Group of Commission 17 of the IAU". Space Science Reviews. 12 (2): 136–186. Bibcode:1971SSRv...12..136M. doi:10.1007/BF00171763. S2CID 122125855.
Moore, Patrick (2001). On the Moon. Sterling Publishing Co. ISBN 978-0-304-35469-6.
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.
Webb, Rev. T. W. (1962). Celestial Objects for Common Telescopes (6th revised ed.). Dover. ISBN 978-0-486-20917-3.
Whitaker, Ewen A. (1999). Mapping and Naming the Moon. Cambridge University Press. ISBN 978-0-521-62248-6.
Wlasuk, Peter T. (2000). Observing the Moon. Springer. ISBN 978-1-85233-193-1.

External links

"Dark lava floor of crater Billy seen by SMART-1". ESA. Retrieved March 31, 2006.

v t e Craters on the Moon: A–B
A	Abbe Abbot Abel Abenezra Abetti Abul Wafa Abulfeda Acosta Adams Aepinus Agatharchides Agrippa Airy Aitken Akis Alan Al-Bakri Albategnius Albert Al-Biruni Alden Alder Aldrin Alekhin Alexander Alfraganus Alhazen Aliacensis Al-Khwarizmi Almanon Al-Marrakushi Aloha Alpetragius Alphonsus Alter Ameghino Amici Ammonius Amontons Amundsen Anaxagoras Anaximander Anaximenes Anděl Anders Anderson Andersson Andronov Ango Angström Ann Annegrit Ansgarius Antoniadi Anuchin Anville Apianus Apollo Apollonius Appleton Arago Aratus Archimedes Archytas Argelander Ariadaeus Aristarchus Aristillus Aristoteles Armiński Armstrong Arnold Arrhenius Artamonov Artemʹev Artemis Artsimovich Aryabhata Arzachel Asada Asclepi Ashbrook Aston Atlas Atwood Autolycus Auwers Auzout Avery Avicenna Avogadro Azophi
B	Baade Babakin Babbage Babcock Back Backlund Baco Baillaud Bailly Baily Balandin Balboa Baldet Ball Balmer Banachiewicz Bancroft Banting Barbier Barkla Barnard Barocius Barringer Barrow Bartels Bawa Bayer Beals Beaumont Becquerel Bečvář Beer Behaim Beijerinck Beketov Béla Belʹkovich Bell Bellinsgauzen Bellot Belopolʹskiy Belyaev Benedict Bergman Bergstrand Berkner Berlage Bernoulli Berosus Berzelius Bessarion Bessel Bettinus Bhabha Bianchini Biela Bilharz Billy Bingham Biot Birkeland Birkhoff Birmingham Birt Bjerknes Black Blackett Blagg Blancanus Blanchard Blanchinus Blazhko Bliss Bobillier Bobone Bode Boethius Boguslawsky Bohnenberger Bohr Bok Boltzmann Bolyai Bombelli Bondarenko Bonpland Boole Borda Borel Boris Borman Born Borya Bosch Boscovich Bose Boss Bouguer Boussingault Bowditch Bowen Boyle Brackett Bragg Brashear Braude Brayley Bredikhin Breislak Brenner Brewster Brianchon Bridgman Briggs Brisbane Bronk Brouwer Brown Bruce Brunner Buch Buffon Buisson Bullialdus Bunsen Burckhardt Bürg Burnham Büsching Butlerov Buys-Ballot Byrd Byrgius

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