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NGC 7331 is one of 18 galaxies chosen by the HST Extragalactic
Distance Scale Key Project to calibrate secondary distance estimators,
using HST to obtain an accurate distance via Cepheid variables, with the
ultimate goal of using these to measure H(naught, a cosomological
parameter) to an external accuracy of 10%. It was determined this galaxy
is 49 million light years away (and perhaps 30,000 light years across). In this image you will see some of the
nearby neighbors being both spiral and elliptical galaxies. Nearby by
this feild (not shown) is another famous group of galaxies known as
Stephan's Quintet.
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color production was used to create this image.
Luminance = 70 minutes
binned 1x1
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Minimum credit line: Louis and Jennifer Goldring/Adam Block/NOAO/AURA/NSF
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Updated: 06/27/03