NGC 3021 NICMOS/ACS detail 2

This image is part of a montage of images of the spiral galaxy NGC 3021 taken by the NASA/ESA Hubble Space Telescope. Hubble made precise measurements of Cepheid variable stars in the galaxy, highlighted in this image. 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. The image was taken with the Near Infrared Camera and Multi-Object Spectrometer (NICMOS).

Credit:

NASA, ESA and A. Riess (STScI/JHU)

About the Image

NASA press release
NASA caption
Id:opo0908d
Type:Observation
Release date:7 May 2009, 15:00
Size:528 x 524 px

About the Object

Name:NGC 3021
Type:• Local Universe : Star : Type : Variable
• Local Universe : Galaxy : Type : Spiral
• X - Galaxies Images/Videos
Distance:90 million light years

Colours & filters

BandWavelengthTelescope
Optical
V
555 nm Hubble Space Telescope
ACS
Infrared
I
814 nm Hubble Space Telescope
ACS
Infrared
H
1.6 μm Hubble Space Telescope
NICMOS

Image Formats

Large JPEG
114.4 KB
Screensize JPEG
255.7 KB

Also see our