Hubble’s Legacy

This Picture of the Week shows a dwarf galaxy named UGC 685. Such galaxies are small and contain just a tiny fraction of the number of stars in a galaxy like the Milky Way. Dwarf galaxies often show a hazy structure, an ill-defined shape, and an appearance somewhat akin to a swarm or cloud of stars — and UGC 685 is no exception to this. Classified as an SAm galaxy — a type of unbarred spiral galaxy — it is located about 15 million light-years from Earth.

These data were gathered under the NASA/ESA Hubble Space Telescope’s LEGUS (Legacy ExtraGalactic UV Survey) Program, the sharpest and most comprehensive ultraviolet survey of star-forming galaxies in the nearby Universe. 

LEGUS is imaging 50 spiral and dwarf galaxies in our cosmic neighbourhood in multiple colours using Hubble’s Wide Field Camera 3. The survey is picking apart the structures of these galaxies and resolving their constituent stars, clusters, groups, and other stellar associations. Star formation plays a huge role in shaping its host galaxy; by exploring these targets in detail via both new observations and archival Hubble data, LEGUS will shed light on how stars form and cluster together, how these clusters evolve, how a star’s formation affects its surroundings, and how stars explode at the end of their lives

Credit:

ESA/Hubble & NASA; the LEGUS team, B. Tully, D. Calzetti
Acknowledgement(s): Judy Schmidt (Geckzilla)

About the Image

Id:potw1935a
Type:Observation
Release date:2 September 2019, 06:00
Size:3335 x 2780 px

About the Object

Name:UGC 685
Type:Local Universe : Galaxy : Size : Dwarf
Distance:15 million light years
Constellation:Pisces
Category:Galaxies

Image Formats

Large JPEG
3.4 MB
Screensize JPEG
340.0 KB

Zoomable


Wallpapers

1024x768
320.6 KB
1280x1024
533.2 KB
1600x1200
811.7 KB
1920x1200
1020.1 KB
2048x1536
1.3 MB

Coordinates

Position (RA):1 7 24.04
Position (Dec):16° 41' 16.21"
Field of view:2.78 x 2.31 arcminutes
Orientation:North is 59.9° right of vertical

Colours & filters

BandWavelengthTelescope
Optical
V
505 nm Hubble Space Telescope
WFPC2
Optical
V
606 nm Hubble Space Telescope
ACS
Optical
I
814 nm Hubble Space Telescope
ACS

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