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About this Object

Object Name:

M31-V1

Object Description:

Cepheid Variable Star V1 in M31

Position (J2000):

R.A. 00h 41m 27s
Dec. +41° 10' 06''

Constellation:

Andromeda

Distance:

The distance to M31 is 2.5 million light-years (0.8 megaparsecs).

Dimensions:

The individual images surrounding the variable star are 5 arcseconds (62.5 light-years or 19.2 parsecs) wide.

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, H. Bond, and D. Soderblom (Hubble Heritage Team/STScI).

Instrument:

WFC3/UVIS

Filters:

F475X (Wide Blue) and F600LP (Long Pass)

Exposure Date:

December 2010 - January 2011

Exposure Time:

1.7 hours

About this Image

Credit:

NASA, ESA, and the Hubble Heritage Team (STScI/AURA)

Release Date:

May 20, 2011

Color:

This image is a composite of separate exposures acquired by the WFC3 instrument on HST. Several filters were used to sample broad and narrow 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

Orientation/Scale: