Annegrit Craterlet Lies in Southwest Mare Imbrium on Lunar Near Side

Summary: Annegrit Craterlet lies in southwest Mare Imbrium on the lunar near side with two named craterlets to the northwest and Mons La Hire to the south.

Detail of Near Side Shaded Relief and Color-Coded Topography Map shows Annegrit's Mons La Hire-Dorsum Zirkel neighborhood in southwestern Mare Imbrium: USGS Astrogeology Science Center / Gazetteer of Planetary Nomenclature, Public Domain, via Wikimedia Commons

Annegrit Carterlet lies in southwest Mare Imbrium on the lunar near side with two named craterlets as northwestern neighbors and Mons La Hire as southern neighbor.

Annegrit is centered at 29.43 degrees north latitude, minus 25.64 degrees west longitude, according to the International Astronomical Union's (IAU) Gazetteer of Planetary Nomenclature. The northern hemisphere craterlet establishes its northernmost and southernmost latitudes at 29.45 degrees north and 29.41 degrees north, respectively. It finds its easternmost and westernmost longitudes at minus 25.61 degrees west and minus 25.66 degrees west, respectively. Annegrit's diameter measures 1.29 kilometers.

Annegrit is located in southwestern Mare Imbrium. Annegrit lies to the east-southeast of the highland break that marks the joining of western Mare Imbrium with eastern Oceanus Procellarum. Mare Imbrium's terrain extends from the near side's northwestern quadrant, across the moon's prime meridian, 0 degrees of longitude, and spills into the northeastern quadrant.

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

Charles and Mavis neighbor to the northwest of Annegrit. Charles lies to the north of Mavis.

Charles is centered at 29.9 degrees north latitude, minus 26.37 degrees west longitude. The craterlet achieves its northernmost and southernmost latitudes at 29.92 degrees north and 29.87 degrees north, respectively. Its easternmost and westernmost longitudes are positioned at minus 26.34 degrees west and minus 26.39 degrees west, respectively. Charles Craterlet diameter measures 1.34 kilometers.

Mavis is centered at 29.76 degrees north latitude, minus 26.36 degrees west longitude. It marks its northernmost and southernmost latitudes at 29.78 degrees north and 29.74 degrees north, respectively. It posts easternmost and westernmost longitudes of minus 26.34 degrees west and minus 26.38 degrees west, respectively. Mavis has a diameter of 1.09 kilometers.

Annegrit lies to the north of Mons La Hire. British selenographer Thomas Gwyn Empy Elger (Oct. 27, 1836-Jan. 9, 1897) described Mons La Hire as a ". . . large bright isolated mountain in the Mare Imbrium. . ." (page 158) in his Victorian era lunar guide, The Moon: A Full Description and Map of Its Principal Physical Features, published in 1895.

Mons La Hire is centered at 27.66 degrees north latitude, minus 25.51 degrees west longitude. The mountain records northernmost and southernmost latitudes of 27.88 degrees north and 27.49 degrees north, respectively. Easternmost and westernmost longitudes register at minus 25.12 degrees west and minus 25.95 degrees west, respectively. Mons La Hire's diameter measures 21.71 kilometers.

Dorsum Zirkel neighbors to the east of Annegrit. The wrinkle ridge slants with a northwest-southeast trend between Annegrit and Mons La Hire. The Gazetteer of Planetary Nomenclature's Descriptor Terms (Feature Types) page defines "dorsum, dorsa" as a "ridge."

Dorsum Zirkel is centered at 29.55 degrees north latitude, minus 24.82 degrees west longitude. The dorsum's northernmost and southernmost latitudes extend to 31.79 degrees north and 27.15 degrees north, respectively. Its easternmost and westernmost longitudes reach minus 22.33 degrees west and minus 27.45 degrees west, respectively. Dorsum Zirkel's diameter spans 195.22 kilometers.

Mons La Hire's satellite craters, La Hire A and La Hire B, neighbor as Annegrit's nearest named southeastern neighbors. The satellites present an alternate side arrangement along southern Dorsum Zirkel.

La Hire A is centered at 28.53 degrees north latitude, minus 23.46 degrees west longitude. Satellite A finds its northernmost and southernmost latitudes at 28.61 degrees north and 28.45 degrees north, respectively. It establishes its easternmost and westernmost longitudes at minus 23.37 degrees west and minus 23.55 degrees west, respectively. La Hire A has a diameter of 4.89 kilometers.

La Hire B is centered at 27.69 degrees north latitude, minus 23.03 degrees west longitude. Satellite B obtains northernmost and southernmost latitudes of 27.76 degrees north and 27.63 degrees north, respectively. Its easternmost and westernmost longitudes occur at minus 22.96 degrees west and minus 23.11 degrees west, respectively. La Hire B has a diameter of 3.84 kilometers.

Annegrit 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). Annegrit is plotted on NASA Lunar Topophotomap 40A1S1, which was published in November 1974. The map's Names Information lists "Annegrit, Charles, Mavis" as unofficial names used "only for the identification of features on this map."

The International Astronomical Union approved Annegrit as the craterlet's official name in 1976. The Gazetteer of Planetary Nomenclature identifies Annegrit as a "German female name."

Detail of Lunar Aeronautical Chart (LAC) 40 shows Annegrit's (center) Mons La Hire-Dorsum Zirkel neighborhood in southwestern 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.

Dedication

This post is dedicated to the memory of our beloved blue-eyed brother, Charles, who guided the creation of the Met Opera and Astronomy posts on Earth and Space News. We memorialized our brother in "Our Beloved Blue-Eyed Brother, Charles, With Whom We Are Well Pleased," published on Earth and Space News on Thursday, Nov. 18, 2021, an anniversary of our beloved father's death.

Image credits:

Detail of Near Side Shaded Relief and Color-Coded Topography Map shows Annegrit's Mons La Hire-Dorsum Zirkel neighborhood in southwestern Mare Imbrium: USGS Astrogeology Science Center / Gazetteer of Planetary Nomenclature, Public Domain, via Wikimedia Commons @ https://commons.wikimedia.org/wiki/File:Near_side_39.jpg

Detail of Lunar Aeronautical Chart (LAC) 40 shows Annegrit's (center) Mons La Hire-Dorsum Zirkel neighborhood in southwestern Mare Imbrium: image credit NASA/GSFC/ASU, via USGS Astrogeology Science Center / Gazetteer of Planetary Nomenclature @ https://planetarynames.wr.usgs.gov/images/Lunar/lac_40_wac.pdf

For further information:

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Available @ https://www.lpi.usra.edu/resources/mapcatalog/topophoto/40A1S1/150dpi.jpg

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Available @ https://planetarynames.wr.usgs.gov/Feature/283

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Available @ https://planetarynames.wr.usgs.gov/Feature/1151

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Available @ https://planetarynames.wr.usgs.gov/Feature/1625

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Available @ https://planetarynames.wr.usgs.gov/Feature/10496

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Available @ https://planetarynames.wr.usgs.gov/Feature/10497

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Available @ https://planetarynames.wr.usgs.gov/Feature/3678

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Available @ https://planetarynames.wr.usgs.gov/Feature/3762

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