News Release Archive:

News Release 2 of 13

May 23, 2011 02:00 PM (EDT)

News Release Number: STScI-2011-15

Hubble Views the Star that Changed the Universe

Technical facts about this news release:

About the Object
Object Name: Cepheid Variable Star V1 in M31
Object Description: R.A. 00h 41m 27s
Dec. +41° 10' 06"
Constellation: Andromeda
Distance: About 2.5 million light-years (0.8 megaparsecs)
About the Data
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).
Data Description: 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).
Instrument: WFC3/UVIS
Exposure Date(s): December 2010 - January 2011
Exposure Time: 1.7 hours
Filters: F475X (Wide Blue) and F600LP (Long Pass)
About the Release
Image Credit: NASA, ESA, and the Hubble Heritage Team (STScI/AURA)
Release Date: May 23, 2011
Color: This image is a composite of separate exposures acquired by the WFC3 instrument on HST. Several filters were used to sample broad wavelength ranges. The color results from assigning different hues (colors) to each monochromatic (grayscale) image associated with an individual filter. In this case, the assigned colors are:
F475X (Wide Blue) cyan
F600LP (Long Pass) orange