Compass and Scale Image of Cepheid Variable V1 in M31
About 2.5 million light-years (0.8 megaparsecs)
The image was created from Hubble data from proposal 12326: K. Noll (PI), Z. Levay, M. Mutchler, T. Borders, L. Frattare, M. Livio, C. Christian, D. Soderblom, and H. Bond (Hubble Heritage Team/STScI).
Note:The Hubble Space Telescope observations of Hubble's Variable M31-V1 were made possible from ground-based data provided by the American Association of Variable Star Observers (AAVSO).
F475X (Wide Blue) and F600LP (Long Pass)