File:Palomar 2 Hubble.jpg

From Wikimedia Commons, the free media repository
Jump to navigation Jump to search

Original file (4,146 × 3,865 pixels, file size: 10.9 MB, MIME type: image/jpeg)

Captions

Captions

Add a one-line explanation of what this file represents

Summary

[edit]
Description

Palomar 2 - A unique cluster: one of the hidden 15

Globular clusters are relatively common in our sky, and generally look similar. However, this image, taken using the NASA/ESA Hubble Space Telescope, shows a unique example of such a cluster — Palomar 2.

Palomar 2 is part of a group of 15 globulars known as the Palomar clusters. These clusters, as the name suggests, were discovered in survey plates from the first Palomar Observatory Sky Survey in the 1950s, a project that involved some of the most well-known astronomers of the day, including Edwin Hubble. They were discovered quite late because they are so faint — each is either extremely remote, very heavily hidden behind blankets of dust, or has a very small number of remaining stars.

This particular cluster is unique in more than one way. For one, it is the only globular cluster that we see in this part of the sky, the northern constellation of Auriga (The Charioteer). Globular clusters orbit the centre of a galaxy like the Milky Way in the same way that satellites circle around the Earth. This means that they normally lie closer in to the galactic centre than we do, and so we almost always see them in the same region of the sky. Palomar 2 is an exception to this, as it is around five times further away from the centre of the Milky Way than other clusters. It also lies in the opposite direction — further out than Earth — and so it is classed as an “outer halo” globular.

It is also unusual due to its brightness. The cluster is veiled by a mask of dust, dampening the apparent brightness of the stars within it and making it appear as a very faint burst of stars. The stunning NASA/ESA Hubble Space Telescope image above shows Palomar 2 in a way that could not be captured from smaller or ground-based telescopes — some amateur astronomers with large telescopes attempt to observe all of the obscure and well-hidden Palomar 15 as a challenge, to see how many they can pick out from the starry sky.

Credit:

ESA/Hubble & NASA

Colours & filters Band	Wavelength	Telescope
 
Optical V      	606 nm  	Hubble Space Telescope ACS
Infrared I     	814 nm  	Hubble Space Telescope ACS
.
Date Release date: 15 April 2013, 10:00
Source http://www.spacetelescope.org/images/potw1315a/ http://www.spacetelescope.org/static/archives/images/large/potw1315a.jpg
Author Credit: ESA/Hubble & NASA
Permission
(Reusing this file)
http://www.spacetelescope.org/copyright/

Licensing

[edit]
Public domain
This file is in the public domain because it was created by NASA and ESA. NASA Hubble material (and ESA Hubble material prior to 2009) is copyright-free and may be freely used as in the public domain without fee, on the condition that only NASA, STScI, and/or ESA is credited as the source of the material. This license does not apply if ESA material created after 2008 or source material from other organizations is in use.

The material was created for NASA by Space Telescope Science Institute under Contract NAS5-26555, or for ESA by the Hubble European Space Agency Information Centre. Copyright statement at hubblesite.org or 2008 copyright statement at spacetelescope.org.

For material created by the European Space Agency on the spacetelescope.org site since 2009, use the {{ESA-Hubble}} tag.

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current08:38, 17 April 2013Thumbnail for version as of 08:38, 17 April 20134,146 × 3,865 (10.9 MB)Fabian RRRR (talk | contribs){{Information |Description='''Palomar 2 - A unique cluster: one of the hidden 15''' Globular clusters are relatively common in our sky, and generally look similar. However, this image, taken using the NASA/ESA Hubble Space Telescope, shows a unique ex...

The following 2 pages use this file:

File usage on other wikis

The following other wikis use this file:

Metadata