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About this Object

Object Name:

Hickson Compact Group 31, HCG 31

Object Description:

Galaxy Group

Position (J2000):

R.A. 05h 01m 38s.75
Dec. -04° 15' 34".10




166 million light-years (51 million parsecs)


This image is 3.2 arcminutes (156,000 light-years or 48,000 parsecs) wide.

About the Data

Data Description:

This image was created from HST data from proposal 10787: J. Charlton (Pennsylvania State University), A. Zabludoff (University of Arizona), M. de Oliveira (University of São Paulo, Brazil), J. Hibbard (AURA/NRAO), S. Zonak (University of Maryland), A. Hornschemeier (NASA/GSFC), P. Hickson (University of British Columbia), J. Mulchaey (Carnegie Institution of Washington), K. Johnson (University of Virginia), A. Maybhate (STScI), R. Chandar (University of Toledo), S. Gallagher (The University of Western Ontario), C. Palma, S. Hunsberger, N. Brandt and M. Eracleous (Pennsylvania State University), P. Durrell (Youngstown State University), J. English (University of Manitoba), B. Whitmore (STScI), D. Elmegreen (Vassar College), and K. Knierman (Arizona State University).




F435W (B), F606W (V), and F814W (I)

Exposure Date:

November, 2006

Exposure Time:

1.1 hours

About this Image


NASA, ESA, S. Gallagher (The University of Western Ontario), and J. English (University of Manitoba)

Release Date:

February 18, 2010


A small amount of WFPC2 data (proposal 5900, PI: P. Conti) taken on October 7, 1995 was used to fill in a portion of the ACS/WFC chip gap in this composite image of HCG 31.


These images are a composite of separate exposures made by the ACS instrument on the Hubble Space Telescope. Three filters were used to sample broad wavelength ranges. The color results from assigning different hues (colors) to each monochromatic image. In this case, the assigned colors are:

F435W (B)


F606W (V)


F814W (I)