Hubble's view of dazzling globular cluster NGC 6397

Esahubble_opo1824a_1024

esahubble_opo1824a April 7th, 2018

Credit: NASA, ESA, and T. Brown and S. Casertano (STScI) Acknowledgement: NASA, ESA, and J. Anderson (STScI)

This ancient stellar jewelry box, a globular cluster called NGC 6397, glitters with the light from hundreds of thousands of stars. Astronomers used the NASA/ESA Hubble Space Telescope to gauge the clusters distance at 7800 light-years away. NGC 6397 is one of the closest globular clusters to Earth. The clusters blue stars are near the end of their lives. These stars have used up their hydrogen fuel that makes them shine. Now they are converting helium to energy in their cores, which fuses at a higher temperature and appears blue. The reddish glow is from red giant stars that have consumed their hydrogen fuel and have expanded in size. The myriad small white objects include stars like our Sun. This image is composed of a series of observations taken from July 2004 to June 2005 with Hubbles Advanced Camera for Surveys. The research team used Hubbles Wide Field Camera 3 to measure the distance to the cluster.

Provider: Hubble Space Telescope | ESA

Image Source: https://esahubble.org/images/opo1824a/

Curator: ESA/Hubble, Baltimore, MD, United States

Image Use Policy: Creative Commons Attribution 4.0 International License

Image Details

Image Type
Observation
Object Name
NGC 6397
Subject - Milky Way
Star > Grouping > Cluster > Globular
Esahubble_opo1824a_128
 

Position Details

Position (ICRS)
RA = 17h 40m 40.1s
DEC = -53° 40’ 11.7”
Orientation
North is 0.1° CCW
Field of View
3.3 x 2.5 arcminutes
Constellation
Ara

Color Mapping

  Telescope Spectral Band Wavelength
Cyan Hubble (ACS) Optical (B) 435.0 nm
Orange Hubble (ACS) Optical (r) 625.0 nm
Spectrum_base
Cyan
Orange
Esahubble_opo1824a_1280
×
ID
opo1824a
Subject Category
B.3.6.4.2  
Subject Name
NGC 6397
Credits
NASA, ESA, and T. Brown and S. Casertano (STScI) Acknowledgement: NASA, ESA, and J. Anderson (STScI)
Release Date
2018-04-07T13:10:11
Lightyears
Redshift
Reference Url
https://esahubble.org/images/opo1824a/
Type
Observation
Image Quality
Good
Distance Notes
Facility
Hubble Space Telescope, Hubble Space Telescope
Instrument
ACS, ACS
Color Assignment
Cyan, Orange
Band
Optical, Optical
Bandpass
B, r
Central Wavelength
435, 625
Start Time
Integration Time
Dataset ID
None, None
Notes
Coordinate Frame
ICRS
Equinox
J2000
Reference Value
265.167038364, -53.6699279762
Reference Dimension
4924.0, 3693.0
Reference Pixel
2854.91609618, 2079.36117835
Scale
-1.11300580097e-05, 1.11300580097e-05
Rotation
0.1266108206
Coordinate System Projection:
TAN
Quality
Full
FITS Header
Notes
Creator (Curator)
ESA/Hubble
URL
https://esahubble.org
Name
Space Telescope Science Institute Office of Public Outreach
Email
outreach@stsci.edu
Telephone
410-338-4444
Address
ESA Office, Space Telescope Science Institute, 3700 San Martin Dr
City
Baltimore
State/Province
MD
Postal Code
21218
Country
United States
Rights
Creative Commons Attribution 4.0 International License
Publisher
ESA/Hubble
Publisher ID
esahubble
Resource ID
opo1824a
Metadata Date
2018-04-02T17:46:39-04:00
Metadata Version
1.1
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Detailed color mapping information coming soon...

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There is no distance meta data in this image.