NGC 7331 and Stephan’s Quin­tet in Pegasus

NGC 7331 shines at 9.5mag in the con­stel­la­tion of Pegas­us at a dis­tance of 47 mil­lion light-years. With an apar­ent size of nearly 10′, its true dia­met­er meas­ures about 130’000 light-years, which is about the same size as the great Andromeda galaxy M31, big­ger then our Milky Way.

Only about 1/​2° south-west, a group of five smal­ler galax­ies can be found, the Stephan’s Quin­tet, also known as Hick­son 92 or Arp 319. NGC 7320, the blu­ish mem­ber of this group, seems to be related to NGC 7331, while the oth­er four galax­ies are recendig at the same speed and are there­fore assumed to be grav­it­a­tion­ally bound to each other.

[descrip­tion from O’Meara]


RCOS 14.5″ f/​8
Apo­gee U16M
Astro­don Gen2
LRGB 460:160:160:160 min.
ROSA Remote Obser­vat­or­ies South­ern Alps
© Mar­tin Ruster­holz, Astrophotographer

Find­er Chart NGC 7331 and Stephan’s Quin­tet in Pegasus

NGC 7731 Galaxy Sky Chart Astrophotography Martin Rusterholz

Image cre­ated by Skychart

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About Me

Hello, my name is Martin Rusterholz. I’m a Swiss amateur astrophotographer living near Zurich, the biggest town in Switzerland. My interest in astronomy started when I was 16. At that time, I built my first Newtonian telescope and mount. I studied physics at the Swiss Federal Institute of Technology (ETH) which was the only study including at least some aspects of astronomy and astrophysics. “Looking at the nights sky is an experience touching everybody deeply inside, something common to all human beings independent to the language spoken by the individuals”. Deep-sky astrophotography is my passion.