Standout stars

This image from the NASA/ESA Hubble Space Telescope reveals a glistening and ancient globular cluster named NGC 3201 — a gathering of hundreds of thousands of stars bound together by gravity. NGC 3201 was discovered in 1826 by the Scottish astronomer James Dunlop, who described it as a “pretty large, pretty bright” object that becomes “rather irregular” towards its centre.

Globular clusters are found around all large galaxies, but their origin and role in galaxy formation remain tantalisingly unclear. Astronomers recently discovered a black hole lurking at the heart of NGC 3201 — its position was revealed by the strange movements of a star being quickly flung around a massive, invisible counterpart. This sparkling group of stars also has some strange properties which make it unique amongst the over 150 globular clusters belonging to the Milky Way. NGC 3201 has an extremely fast velocity with respect to the Sun and its orbit is retrograde, meaning that it moves speedily in the opposite direction to the galactic centre, which it orbits.

The unusual behaviour of this cluster suggests that it may have extragalactic origins, but at some point was captured by the Milky Way’s gravity. However, the chemical makeup of this intriguing cluster tells a different story — the stars within NGC 3201 are chemically very similar to those of other galactic globular clusters, implying that they formed at a similar location and time to their neighbours.

Whether this mysterious cluster was adopted by our galaxy or has for some reason evolved very differently to the family of clusters it grew up with, it is certainly an unusual astronomical beauty.


Acknowledgement: Sarajedini et al.

Credit:

ESA/Hubble & NASA

About the Image

Id:potw1804a
Type:Observation
Release date:22 January 2018, 06:00
Size:3007 x 3106 px

About the Object

Name:NGC 3201
Type:Milky Way : Star : Grouping : Cluster : Globular
Distance:16000 light years
Constellation:Vela
Category:Star Clusters
Stars

Image Formats

Large JPEG
4.1 MB
Screensize JPEG
512.1 KB

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Wallpapers

1024x768
474.7 KB
1280x1024
721.6 KB
1600x1200
990.0 KB
1920x1200
1.1 MB
2048x1536
1.5 MB

Coordinates

Position (RA):10 17 36.97
Position (Dec):-46° 24' 39.11"
Field of view:2.51 x 2.59 arcminutes
Orientation:North is 20.4° left of vertical

Colours & filters

BandWavelengthTelescope
Ultraviolet
UV
275 nm Hubble Space Telescope
WFC3
Optical
B
435 nm Hubble Space Telescope
ACS
Optical
u
336 nm Hubble Space Telescope
WFC3
Optical
V
606 nm Hubble Space Telescope
ACS
Optical
I
814 nm Hubble Space Telescope
ACS

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