News Release Archive:

News Release 9 of 30

May 7, 2009 09:00 AM (EDT)

News Release Number: STScI-2009-08

Refined Hubble Constant Narrows Possible Explanations for Dark Energy

Technical facts about this news release:

About the Object
Object Name: NGC 3021
Object Description: Spiral Galaxy
Position (J2000): R.A. 09h 50m 57s.13
Dec. +33° 33' 12".71
Constellation: Leo Minor
Distance: 92 million light-years (28 megaparsecs)
Dimensions: This image is roughly 1.5 arcminutes (41,000 light-years or 12.5 kiloparsecs) wide.
About the Data
Data Description:

Data from several HST proposals were used for this science. These include: 9352, 9728, 10189, 10339, and 10802, PI: A. Riess (STScI/JHU). Data specific to observations of NGC 3021 are from HST proposals 10802 and 10497 PI: A. Riess (STScI/JHU).

The science team includes: A. Riess (STScI/JHU), L. Macri (Texas A&M University), S. Casertano and M. Sosey (STScI), H. Lampeitl (STScI/University of Portsmouth, UK), H. Ferguson (STScI), A. Filippenko (University of California, Berkeley), S. Jha (Rutgers University), W. Li and R. Chornock (University of California, Berkeley), and D. Sarkar (University of California, Irvine).

Instrument: ACS/WFC NICMOS
Filters: F555W (V) and F814W (I) F160W (H-band)
Exposure Date(s): November 2005 - November 2006 October 2006 - March 2007
Exposure Time: 23.8 hours 18.4 hours
About the Release
Credit: NASA, ESA, and A. Riess (STScI)
Release Date: May 7, 2009
Orientation/Scale: Compass and Scale File for NGC 3021