M31_V1 in the Andromeda Galaxy
span class="medium"This is an image of the Cepheid variable that Edwin Hubble used to obtain the first distance estimate to the Andromeda galaxy. Magnitude range is 18.5 to 19.8 with a period of 31.4 days./spanbr/ Stack of 30 exposures at 15s, f/5 at 1530 mm focal length