HD 12139 [SEP] constellation
HD 12139
HD 12139 is a double star in the constellation Aries. With an apparent magnitude of 5.89, the stars can be seen by the naked eye under good conditions in rural areas. The system is located approximately distant, and the brighter star is a red giant, meaning that it has used up its core hydrogen and is expanding.
Battery D was reinforced to its authorized wartime strength.
Detachments from Btry A formed Btry 80-X in December 1941; a second detachment helped form the 804th CA (HD) Btry (Sep). Btry F at Sand Is. was designated the 807th CA (HD) Btry (Sep), while a second detachment helped organize the 715th CA (HD) Btry (Sep) 10-21-42. During World War II, various changes were made in the makeup of the 55th CA. The 55th CA (