HD 157661 [SEP] constellation
HD 157661
HD 157661 is the Henry Draper Catalogue designation for a likely triple star in the southern constellation of Ara. With a measured annual parallax of 5.13 mas, is located at a distance of approximately from Earth. The combined apparent visual magnitude of the stars is 5.29, which means it is faintly visible to the naked eye.
The inner components of this system consist of a pair of B-type main sequence stars. The brighter star has a magnitude of 5.70 and a stellar classification of B7 V.
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 (