Robert's Quartet

Robert's Quartet is a family of four very different galaxies, located at a distance of about 160 million light-years, close to the centre of the southern constellation of the Phoenix. Its members are NGC 87, NGC 88, NGC 89 and NGC 92, discovered by John Herschel in the 1830s.

NGC 87 (upper right) is an irregular galaxy similar to the satellites of our Milky Way, the Magellanic Clouds. NGC 88 (centre) is a spiral galaxy with an external diffuse envelope, most probably composed of gas. NGC 89 (lower middle) is another spiral galaxy with two large spiral arms. The largest member of the system, NGC 92 (left), is a spiral Sa galaxy with an unusual appearance. One of its arms, about 100,000 light-years long, has been distorted by interactions and contains a large quantity of dust.

Crédit:

ESO

À propos de l'image

Identification:eso0535a
Type:Observation
Date de publication:4 novembre 2005
Communiqués de presse en rapport:eso0535
Taille:1825 x 1688 px

À propos de l'objet

Nom:NGC 87, NGC 88, NGC 89, NGC 92
Type:Local Universe : Galaxy
Distance:150 million années lumière
Constellation:Phoenix
Catégorie:Galaxies

Formats des images

Grand JPEG
1,6 Mio
JPEG taille écran
109,8 Kio

Fonds d'écran

1024x768
158,2 Kio
1280x1024
328,6 Kio
1600x1200
671,9 Kio
1920x1200
991,2 Kio
2048x1536
1,3 Mio

Coordinates

Position (RA):0 21 22.07
Position (Dec):-48° 38' 33.78"
Field of view:6.11 x 5.65 arcminutes
Orientation:North is 1.6° right of vertical

Couleurs & filtres

DomaineLongueur d'ondeTélescope
Visible
B
440 nmVery Large Telescope
FORS2
Visible
V
557 nmVery Large Telescope
FORS2
Visible
R
655 nmVery Large Telescope
FORS2
Infrarouge
I
768 nmVery Large Telescope
FORS2