HST ACS/WFC Image of NGC 3021
stsci_2009-08b May 7th, 2009
Credit: NASA, ESA, and A. Riess (STScI/J
This is a NASA Hubble Space Telescope photo of the spiral galaxy NGC 3021. This was one of several hosts of recent Type Ia supernovae observed by astronomers to refine the measure of the universe's expansion rate, called the Hubble constant. Hubble made precise measurements of Cepheid variable stars in the galaxy, highlighted by green circles in the four inset boxes. These stars pulsate at a rate that is matched closely to their intrinsic brightness. This makes them ideal for measuring intergalactic distances. The Cepheids are used to calibrate an even brighter milepost marker that can be used over greater distances, a Type Ia supernova. The supernova was observed in the galaxy in 1995.
Provider: Space Telescope Science Institute
Image Source: https://hubblesite.org/contents/news-releases/2009/news-2009-08
Curator: STScI, Baltimore, MD, USA
Image Use Policy: http://hubblesite.org/copyright/
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Download Options
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Full Size Image
(1838 x 2119)
Source TIFF (3.55 MB)
- Additional Sizes (JPG)
- 277 x 320 (37.9 KB)
- 1110 x 1280 (321 KB)
- 433 x 500 (65.7 KB)
- 1387 x 1600 (477 KB)
- 888 x 1024 (215 KB)
Image Details
Distance
Position Details
Color Mapping
- ID
- 2009-08b
- Subject Category
- C.5 C.6.2.5 C.6.2.4 C.6.2.3
- Subject Name
- NGC 3021
- Credits
- NASA, ESA, and A. Riess (STScI/J
- Release Date
- 2009-05-07T00:00:00
- Lightyears
- 92,000,000
- Redshift
- 92,000,000
- Reference Url
- https://hubblesite.org/contents/news-releases/2009/news-2009-08
- Type
- Observation
- Image Quality
- Good
- Distance Notes
- 92 million light-years (28 megaparsecs)
- Facility
- Hubble, Hubble, Hubble
- Instrument
- ACS, ACS, NICMOS
- Color Assignment
- Grayscale, Grayscale, Grayscale
- Band
- Optical, Optical, Infrared
- Bandpass
- V, I, H
- Central Wavelength
- 555, 814, 1600
- Start Time
- 2005-11-30T00:00:00, 2006-10-26T00:00:00, 2005-11-12T00:00:00
- Integration Time
- Dataset ID
- Notes
- N
- Coordinate Frame
- ICRS
- Equinox
- J2000
- Reference Value
- 147.7397804, 33.5556984
- Reference Dimension
- 1838.0, 2119.0
- Reference Pixel
- 920.0, 1060.5
- Scale
- -1.45629e-05, 1.4562863e-05
- Rotation
- 128.97
- Coordinate System Projection:
- TAN
- Quality
- Full
- FITS Header
- Notes
- WCS retrieved using CXCs PinpointWCS
- Creator (Curator)
- STScI
- URL
- http://hubblesite.org
- Name
- Space Telescope Science Institute Office of Public Outreach
- outreach@stsci.edu
- Telephone
- 410-338-4444
- Address
- 3700 San Martin Drive
- City
- Baltimore
- State/Province
- MD
- Postal Code
- 21218
- Country
- USA
- Rights
- http://hubblesite.org/copyright/
- Publisher
- STScI
- Publisher ID
- stsci
- Resource ID
- STSCI-H-p0908b-f-1838x2119.tif
- Resource URL
- https://mast.stsci.edu/api/latest/Download/file?uri=mast:OPO/product/STSCI-H-p0908b-f-1838x2119.tif
- Related Resources
- http://hubblesite.org/newscenter/archive/releases/2009/08
- Metadata Date
- 2022-07-06T00:00:00
- Metadata Version
- 1.2
Detailed color mapping information coming soon...
