Asterisms – “A” Asterism

Original article appears in GuideStar March, 2021.

by Steve Goldberg

Asterism: A grouping of stars that form a recognizable pattern.
Constellation: Sextans
Right Ascension: 10 h, 20 m 10s
Declination: 03o 06’ 20”
Magnitude:  10
Size: 15’ (minutes)

This grouping of 5 stars is called the “A Asterism”. It was named by Houston Astronomical Society member Bram Weisman. It is located in Sextans, between Regulus Alpha α in Leo and Alpha α Hydra.


It is located at the “point” of a triangle formed with stars Alpha α and Beta β Sextans.


The letter “A” is very distinctive. The magnification in this view is 48x.

This asterism is recognized by the Astronomical League in their Asterism Observing Program. Information about that AL program can be found here:   Asterism Observing Program

Bram wrote a “discovery” article in the May, 2017 Guidestar. You can see the Guidestar article here.


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