Seyfert's Sextet

group of galaxies in Serpens Caput constellation

Seyfert's Sextet is a group of galaxies. It is located about 190 million light years away from Earth.[1] From Earth, it is in the constellation of Serpens. Although appears to have 6 members, one of the galaxies, NGC 6027d, is just a background galaxy and another member, NGC 6027e, is actually not a galaxy, it is just the tidal tail from the galaxy NGC 6027. All of the galaxies are violently interacting and will continue hundreds of millions of years. They all will collide into one giant elliptical galaxy.

Seyfert's Sextet taken by HST. All members have been labelled.

Discovery change

The group was discovered by Carl Keenan Seyfert in using photographic plates made at the Barnard Observatory of Vanderbilt University. The results were published in 1951. At the time, this group is the most compact galactic group ever identified.[2]

Members change

There are 4 true members of the group, 1 background galaxy and 1 object that is now identified to be a tidal tail.

Members of Seyfert's Sextet
Name Type Distance from Sun

(million ly)

Apparent magnitude
NGC 6027 S0 pec. ~190 +14.7
NGC 6027a Sa pec. ~190 +15.4
NGC 6027b S0 pec. ~190 +15.4
NGC 6027c SB(S)c ~190 +16
NGC 6027d SB(S)bc pec. ~877[3] +15.6
NGC 6027e SB0 pec. ~190 +16.5

References change

  1. "Hubble Watches Galaxies Engage in Dance of Destruction". Retrieved 2021-06-12.
  2. Seyfert, Carl K. (1951-04-01). "A Dense Group of Galaxies in Serpens". Publications of the Astronomical Society of the Pacific. 63 (371): 72. Bibcode:1951PASP...63...72S. doi:10.1086/126319. ISSN 1538-3873. S2CID 121288775.
  3. "Your NED Search Results". Retrieved 2021-06-12.