Seyfert's Sextet is a group of galaxies about 190 million light-years away[1] in the constellation Serpens. The group appears to contain six members, but one of the galaxies, NGC 6027d, is a background object (700 million light years behind the group) and another "galaxy," NGC 6027e, is actually a part of the tail from galaxy NGC 6027. The gravitational interaction among these galaxies should continue for hundreds of millions of years. Ultimately, the galaxies will merge to form a single giant elliptical galaxy.
The group was discovered by Carl Keenan Seyfert using photographic plates made at the Barnard Observatory of Vanderbilt University. When these results were first published in 1951, this group was the most compact group ever identified.[2]
Name | Type | Distance from Sun (million ly) | 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 |