This is a galaxy group of 4 galaxies, called Hickson 61, located in the constellation of Coma Berenices at a declination of +29 degrees. It is the 4th brightest group out of the 100 in the Hickson catalogue. 

This object is also nicknamed the Box.  As such, it is 1 of 4 nicknamed Hickson groups.  The other 3 nicknames are for Hickson 57 (Copeland's Septet), Hickson 79 (Seyfert's Sextet), and Hickson 92 (Stephan's Quintet).

This is not a true cluster - the 3 yellow galaxies are all about the same distance at 180 million light year away, although I don't see much disturbance so I believe they are too far apart to be interacting.   As you might expect, the blue galaxy is much closer, at about 40 million light years away.

This tight and uniquely oriented grouping of four galaxies spans less than 4 arc-minutes. At the top is the low surface brightness (LSB) spiral galaxy NGC 4173 with a diameter of 70,000 light years.  At left is NGC 4175, an edge-on spiral galaxy with a wide dust lane and a diameter of 95,000 light years. To the right is the 90,000 light year diameter lenticular galaxy NGC 4169.  The bottom galaxy is edge-on spiral galaxy NGC 4174 at only 50,000 light years in diameter. 

The Hickson catalog is a collection of 100 galaxy groups, established by Paul Hickson in 1982. Hickson compact galaxy groups are strictly defined by 3 criteria: number of galaxies, total magnitude, and isolation from other galaxies. A typical Hickson group has 4 galaxies, but some have up to 8. You can see more about Hickson galaxy groups in my Astrobin Hickson Collection.

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