Based on a recessional velocity of 3185 km/sec, NGC 7450 is about 150 million light years away. Given that and its apparent size of 1.8 by 1.8 arcmins, it is about 80 thousand light years in diameter. It is a Seyfert galaxy (type Sy1.5), with the very bright core typical of such galaxies.

Based on a recessional velocity of 810 km/sec, NGC 7457 is about 38 million light years away, and although for such a small radial velocity, peculiar (non-Hubble expansion) velocities could considerably alter the result, the value is in good agreement with redshift-independent distance estimates of 38 to 43 million light years. Given that and its apparent size of 4.3 by 2.3 arcmin, the galaxy is about 50 thousand light years across. As is typical of most galaxies, stars in its core are much closer together than in more distant regions. Estimates based on HST images of the core are that it is packed with more than 30 thousand times as many stars per unit volume of space than the region near our Sun. This means that the stars near the center of the galaxy are over thirty times closer together than stars near the Sun. That represents separations of only a light month or two; but although the sky would be full of stars in the core of NGC 7457, they would still be infinitely small dots in comparison to their distance from each other.

A contact double system. Apparent size of component 1 is about 0.4 by 0.4 arcmin. Apparent size of component 2 is about 0.8 by 0.4 arcmin. The NGC entry corresponds to the pair, not to either of the individual galaxies.

The first IC states "7472 and 7477 to be struck out, both being = 7482 with errors of 2 minutes and 1 minute in RA (Burnham)".

The first IC states "7472 and 7477 to be struck out, both being = 7482 with errors of 2 minutes and 1 minute in RA (Burnham)". Apparent size about 0.6 by 0.4 arcmin.

The second IC notes "is a cluster of extremely faint stars (Roberts)". Apparent size of central core about 4 arcmin, but a fainter halo extends another arcmin or so in all directions. The distance of the cluster is about 85 thousand light years, so its core is about 100 light years across, and its outer halo about 150 light years. The globular is moving toward us at about 200 km/sec, which is a "real" radial velocity, as the Universal expansion has no effect on even outlying members of our galaxy. (Note about the high-resolution image of the cluster at bottom: This image is posted on or linked from several online catalogs of open and globular clusters, but with no indication of its original source. As a result, its copyright status is unclear. I am attempting to determine where it came from, so I can request permission to keep the image on this site. If you know where it came from, please let me know. Once I determine the original source and obtain (or do not obtain) permission to leave the image as-is, this note will be deleted, and if need be, the image as well.)

Apparent size 3.3 by 3.1 arcmin. (Note concerning the Faulkes Telescope Project image below: This image was posted on a commercial forum by Oliver Tunnah, the person who took it. Under normal circumstances, if the image were copyrighted, there would be some notice to that effect. There was no such notice, so it is probably legal to use it on a non-commercial site such as this one, as long as credit is given where credit is due; hence my decision to post it on a temporary basis, with a link to the original posting. However, I am also attempting to contact Mr. Tunnah and FTP, to see whether that is correct and if not, to request permission to keep the post as-is. If I obtain such permission, this note will be removed; if I do not, the image will be removed. In the meantime, anyone wishing to use the image on any other site (particularly a commercial site) should seek such permission, as well.)