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NGC 2775 is a magnitude +10.5 spiral galaxy located in the constellation of Cancer, close to its border with Hydra. The galaxy is unusual in that it contains a very smooth nucleus with multiple spiral arms extending outwards from the central region. What makes the spiral arms interesting is their incredibly complex detail, tightly wound structures and active star formation. Amateur astronomers should also keep their eye on this galaxy; it's been host to 5 supernovae explosions in the past 30 years and you never know when the next one will go off!

To find NGC 2775 look for the head of Hydra "the Sea Serpent". The asterism of stars that forms the head are ω Hyd (mag. +5.0), ζ Hyd (mag. +3.1), ρ Hyd (mag. +4.4), ε Hyd (mag. +3.4), δ Hyd (mag. +4.1), σ Hyd (mag. +4.5) and η Hyd (mag. +4.3). None of the stars are particularly bright but all can be seen with the naked eye. The galaxy is positioned a few degrees east and slightly north of this grouping.

NGC 2775 was discovered by William Herschel in 1783 and is best seen during the months of February, March and April. The galaxy is located 55.5 million light-years from Earth and has an actual diameter of 70,000 light-years. It's estimated to contain 100 billion stars.

C48 - NGC 2775 - Spiral Galaxy (NASA/ESA/AURA/STScI/Robert Gendler)

Finder Chart for C48 - NGC 2775

Finder Chart for C48 - NGC 2775 - pdf format

NGC 775 can be seen with telescopes of 100mm (4-inch) aperture on dark nights with good transparency. At best it appears as very dim glow of light. The galaxy appears as a nebulous pale streak of light in a 200mm (8 inch) scope at about 120x magnification. Larger 300mm (12-inch) instruments reveal a large and bright oval shaped galaxy with a bright core and some fine mottling in the arms. The beauty of the tightly wound spiral arms is revealed in images taken by the finest telescopes, such as the Hubble Space Telescope. Overall NGC 775 spans 4.3 x 3.3 arc minutes of apparent sky.

The largest galaxy in a small group known as NGC 2775 group. It forms part of the Virgo Supercluster that also includes NGC 2777 and UGC 4781.

C48 Data Table

Caldwell48
NGC2775
Object TypeSpiral Galaxy
ConstellationCancer
Distance (ly)55.5 Million
Apparent Mag.10.5
RA (J2000)09h 10m 20s
DEC (J2000)07h 02m 16s
Apparent Size (arc mins)4.3 x 3.3
Radius (light-years)35,000
Number of Stars100 Billion