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News Release Archive:

News Release 15 of 66

July 10, 2008 09:00 AM (EDT)

News Release Number: STScI-2008-25

What's My Age? Mystery Star Cluster Has 3 Different Birthdays

Technical facts about this news release:

About the Object
Object Name: NGC 6791
Object Description: Open Cluster
Position (J2000): R.A. 19h 20m 53s.00
Dec. +37° 46' 18".00
Constellation: Lyra
Distance: 13,300 light-years or 4 kiloparsecs
Dimensions: The image is approximately 2.5 arcminutes (10 light-years or 3 parsecs) wide.
About the Data
Data Description: This image was created from HST data from proposals 9815: I. King (University of Washington), J. Anderson (STScI), G. Piotto (University of Padova), and L. Bedin (STScI); and 10471: I. King (University of Washington), J. Anderson (STScI), G. Piotto (University of Padova), L. Bedin (STScI), S. Cassisi (Collurania Astronomical Observatory, Italy), and M. Salaris (Liverpool John Moores University).
Instrument: ACS/WFC
Exposure Date(s): July 2003, July 2005
Exposure Time: 6 hours
Filters: F606W (V), F814W (I)
About the Image
Image Credit: NASA, ESA, and L. Bedin (STScI)
Release Date: July 10, 2008
Color: The image is a composite of several separate exposures made by the ACS instrument on the Hubble Space Telescope. Two filters were used to sample broad wavelength ranges in the visible and near infrafed. The color results from assigning different hues (colors) to each monochromatic image. In this case, the assigned colors are:
F606W (V) cyan
F814W (I) orange
Orientation/Scale: