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.

Crediti:

ESO

A proposito dell'immagine

Identificazione:eso0535a
Tipo:Osservazione
Data di pubblicazione:04 Novembre 2005
Notizie relative:eso0535
Dimensione:1825 x 1688 px

A proposito delll'oggetto

Nome:NGC 87, NGC 88, NGC 89, NGC 92
Tipo:Local Universe : Galaxy
Distanza:150 Milione Anni luce
Constellation:Phoenix
Categoria:Galaxies

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Coordinate

Position (RA):0 21 22.07
Position (Dec):-48° 38' 33.78"
Field of view:6.11 x 5.65 arcminutes
Orientazione:Il Nord è a 1.6° a destra della verticale

Colori e filtri

BandaLunghezza d'ondaTelescopio
Ottico
B
440 nmVery Large Telescope
FORS2
Ottico
V
557 nmVery Large Telescope
FORS2
Ottico
R
655 nmVery Large Telescope
FORS2
Infrarosso
I
768 nmVery Large Telescope
FORS2