Ann Craterlet Resides in Southeastern Mare Imbrium on Lunar Near Side

Summary: Ann Craterlet resides in southeastern Mare Imbrium on the lunar near side as a string of northern hemisphere craterlets northwest of Montes Appeninus.

Detail of Near Side Shaded Relief and Color-Coded Topography Map shows Ann's (left center; between Rimae Archimedes and Rima Bradley) Montes Apenninus neighborhood in southeastern Mare Imbrium: USGS Astrogeology Science Center / Gazetteer of Planetary Nomenclature

Ann Craterlet resides in southeastern Mare Imbrium on the lunar near side in a string of four northern hemisphere craterlets that neighbor to the northwest of Montes Appeninus.

Ann is centered at 25.11 degrees north latitude, minus 0.05 degrees west longitude, according to the International Astronomical Union's (IAU) Gazetteer of Planetary Nomenclature. The northern hemisphere craterlet finds its northernmost and southernmost latitudes at 25.13 degrees north and 25.09 degrees north, respectively. It establishes its easternmost and westernmost longitudes at minus 0.02 degrees west and minus 0.09 degrees west, respectively. Ann has a diameter of 2.12 kilometers.

Ann Craterlet is located in the southeastern edge of Mare Imbrium. Ann lies to the southwest of the highland break that marks the joining of eastern Mare Imbrium with western Mare Serenitatis.

The large, dark, basaltic plain known as Mare Imbrium ("Sea of Showers") primarily occupies the lunar near side's northwestern quadrant. Easternmost Mare Imbrium extends across the moon's prime meridian, which marks 0 degrees of longitude, to invade the northeastern quadrant.

Mare Imbrium is centered at 34.72 degrees north latitude, minus 14.91 degrees west longitude. Its northernmost and southernmost latitudes extend to 51.46 degrees north and 15.23 degrees north, respectively. Its easternmost and westernmost longitudes stretch to 8.56 degrees east and minus 38.36 degrees west, respectively. Mare Imbrium's diameter spans 1,145.53 kilometers.

Michael occurs as the named crater neighboring nearest to Ann Craterlet in Mare Imbrium. Lying to the southeast of Ann, Michael resides, east of the moon's prime meridian, in the near side's northeastern quadrant.

Michael is centered at 25.05 degrees north latitude, 0.21 degrees east longitude. The northeastern quadrant craterlet posts northernmost and southernmost latitudes of 25.08 degrees north and 25.02 degrees north, respectively. It marks its easternmost and westernmost longitudes at 0.28 degrees east and 0.15 degrees east, respectively. Michael's diameter measures 3.46 kilometers.

As Michael's southeastern neighbor, Patricia lies to the southeast of Ann. As with Michael, Patricia is located in the near side's northeastern quadrant.

Patricia is centered at 24.91 degrees north latitude, 0.5 degrees east longitude. The northeastern quadrant craterlet obtains its northernmost and southernmost latitudes at 24.99 degrees north and 24.81 degrees north, respectively. It places its easternmost and westernmost longitudes at 0.66 degrees east and 0.33 degrees east, respectively. Patricia's diameter measures 10.08 kilometers.

Kathleen lies to the northwest of Ann, Michael and Patricia. Kathleen joins Ann as a northwestern quadrant occupant, versus the northeastern quadrant occurrences of Michael and Patricia.

Kathleen is centered at 25.34 degrees north latitude, minus 0.83 degrees west longitude. The northwestern quadrant craterlet records northernmost and southernmost latitudes of 25.39 degrees north and 25.3 degrees north, respectively. It registers easternmost and westernmost longitudes of minus 0.74 degrees west and minus 0.93 degrees west, respectively. Kathleen's diameter measures 5.37 kilometers.

The string of four named craterlets to which Ann belongs finds Kathleen as the northernmost and westernmost of the four. Patricia qualifies as the easternmost and southernmost of the four.

Patricia's diameter of 10.08 kilometers qualifies as the largest of the four. Ann's diameter of 2.12 kilometers places as the smallest of the four. Kathleen's 5.37 kilometers and Michael's 3.46 kilometers rate as the second and third largest diameters, respectively, of the four.

The near side's two northern quadrants are represented equally by the string of four craterlets. Ann and Kathleen are located in the northwestern quadrant. Michael and Patricia are sited in the northeastern quadrant.

Ann's string veers to the northwest of the mountainous terrain that edges southeastern Mare Imbrium. Montes Appeninus trends northeast-southwest as the range defines Mare Imbrium's southeastern border. As with Mare Imbrium, the mountain range straddles the moon's prime meridian, with territory in both northern quadrants.

Montes Appeninus ("Appenine Mountains") are centered at 19.87 degrees north latitude, 0.03 degrees east longitude. The range's northernmost and southernmost latitudes tap 28.47 degrees north and 14.63 degrees north, respectively. The range's easternmost and westernmost longitudes stretch to 7.34 degrees east and minus 10.21 degrees west, respectively. The diameter, or greatest length, of Montes Appeninus spans 599.67 kilometers.

Ann numbers among 95 minor features identified with first-name designations on lunar topophotomaps prepared and published by The Defense Mapping Agency (DMA) for the National Aeronautics and Space Administration (NASA). Ann is plotted on NASA Lunar Topophotomap 41A3S1, which was published in August 1974. The map's Names Information lists "Ann, Ian, Kathleen, Michael, Patricia, Vladimir" as unofficial names used "only for the identification of features on this map."

The International Astronomical Union approved Ann as the craterlet's official name in 1976. The Gazetteer of Planetary Nomenclature notes Ann as: "Hebrew female name."

Detail of Lunar Aeronautical Chart (LAC) 41 shows Ann's (upper left) Montes Apenninus neighborhood in southeastern Mare Imbrium: image credit NASA/GSFC/ASU, via USGS Astrogeology Science Center / Gazetteer of Planetary Nomenclature

Acknowledgment

My special thanks to talented artists and photographers/concerned organizations who make their fine images available on the internet.

Image credits:

Detail of Near Side Shaded Relief and Color-Coded Topography Map shows Ann's (left center; between Rimae Archimedes and Rima Bradley) Montes Apenninus neighborhood in southeastern Mare Imbrium: USGS Astrogeology Science Center / Gazetteer of Planetary Nomenclature @ https://planetarynames.wr.usgs.gov/images/moon_nearside.pdf

Detail of Lunar Aeronautical Chart (LAC) 41 shows Ann's (upper left) Montes Apenninus neighborhood in southeastern Mare Imbrium: image credit NASA/GSFC/ASU, via USGS Astrogeology Science Center / Gazetteer of Planetary Nomenclature @ https://planetarynames.wr.usgs.gov/images/Lunar/lac_41_wac.pdf

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