Return to Heritage Home Page Current Image Gallery Archive Information Center Hubble Art Search
Return to Heritage Home Page Current Release Home Page Caption Fast Facts Supplemental Material Biographies
About this Object
Object Name:
Westerlund 2 and Gum 29
Object Description:
Cluster and Emission Nebula/Star-forming Region
Position (J2000):
R.A. 10h 23m 58.10s
Dec. -57° 45' 48
20,000 light-years (6,130 parsecs)
This image is 7.4 arcminutes (43.2 light-years or 13.4 parsecs) wide.
About the Data
Data Description:
Data of Westerlund 2 were obtained from the HST proposals 13038: A. Nota (ESA/STScI), E. Sabbi and C. Christian (STScI), E. Grebel and P. Zeidler (Astronomisches Rechen-Institut Heidelberg), M. Tosi (INAF, Osservatorio Astronomico di Bologna), A. Bonanos (National Observatory of Athens, Astronomical Institute), and S. de Mink (University of Amsterdam); and 14039: Z. Levay, M. Mutchler, J. Mack, L. Frattare, S. Meyett, M. Livio, and C. Christian (STScI/AURA), K. Noll (NASA/GSFC), A. Nota (STScI/ESA), and E. Sabbi (STScI).
Instruments, Filters, Exposure Dates, and Times:
Instrument Filter Exposure Date Exposure Time
ACS/WFC F555W (V) September 2013 - November 2014 9531 seconds
ACS/WFC F814W (I) 9755 seconds
WFC3/IR F125W (J) November 2014 3788 seconds
About this Image
NASA, ESA, the Hubble Heritage Team (STScI/AURA), A. Nota (ESA/STScI), and the Westerlund 2 Science Team
Release Date:
April 23, 2015


These images are composites of separate exposures acquired by the ACS and the WFC3 instruments on the Hubble Space Telescope. 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:
   ACS/WFC: F555W (V)
   ACS/WFC: F555W (V) and F814W (I)
   ACS/WFC: F814W (I)

Central portion of Westerlund 2 Cluster
   ACS/WFC: F555W (V) blue
   ACS/WFC: F814W (I)
   WFC3/IR: F125W (J) red