Recessional velocity of 225 km/sec is too small, in comparison to peculiar (non-Hubble expansion) velocities, to be a reliable indicator of distance. And in fact, the resulting distance estimate of 10 million light years is far smaller than redshift-independent distance estimates of 30 to 65 million light years. Assuming a more reasonable distance of roughly 50 million light years, the apparent size of 2.3 by 1.6 arcmin suggests it is about 30 thousand light years across. The core of the galaxy is exceptionally bright. Recent studies have shown that the reason is that it contains large numbers of hot, bright young stars. This is very unusual in elliptical or lenticular galaxies, which contain very little gas and dust, from which new stars can be made. The explanation appears to be, as shown in the bottom photograph for this object, that it has recently (within the last billion or two years) "cannibalized" or merged with another galaxy (probably about a twentieth of its size and mass), which contained substantial amounts of gas and dust, which are the source material for the new stellar population. The "metal" (non-hydrogen and helium) content of the new stars is very low, indicating that the merged galaxy had not created many stars, or any significant amount of heavy atoms from the death of such stars, prior to its merger with NGC 4150.

(Note: An NED search for NGC 4155 incorrectly shows NGC 4152; use the PGC listing to access the correct information.) Based on a recessional velocity of 7380 km/sec, NGC 4155 is about 340 million light years away. Given that and its apparent size of 1.1 by 1.0 arcmin, it is about 110 thousand light years across.

NGC 4169 is listed in NED as a Seyfert galaxy (type Sy2). Based on a recessional velocity of 3785 km/sec, it is about 175 million light years away. Given that and its 1.8 by 0.9 arcmin apparent size, it is about 90 thousand light years across. NGC 4169, 4174 and 4175 may form a physical as well as an apparent triplet; but NGC 4173 is almost certainly a foreground object.

Because of its nearly edge-on presentation, it is difficult to determine the galaxy type for NGC 4173. It is clearly less dense and more irregular in appearance than "typical" spirals, but is listed as type SBd and Sdm in NED (the d and dm suffixes meaning that it is some kind of low-density spiral, and the S and SB prefixes meaning that the presence or absence of a bar is a matter of opinion). Based on a recessional velocity of 1125 km/sec, NGC 4173 is about 55 million light years away; however, that is very uncertain, as the sole redshift-independent distance estimate is just over 30 million light years. Presuming a distance of around 45 million light years, NGC 4173's apparent size of 5.0 by 0.7 arcmin suggests that it is around 65 thousand light years across. NGC 4169, 4174 and 4175 may form a physical as well as an apparent triplet; but NGC 4173 is almost certainly a foreground object, so an NED reference to its being a member of a triplet is equally certainly wrong.

Based on a recessional velocity of 4045 km/sec, NGC 4174 is about 190 million light years away. Given that and its 0.8 by 0.5 arcmin apparent size, it is about 45 thousand light years across. NGC 4169, 4174 and 4175 may form a physical as well as an apparent triplet; but NGC 4173 is almost certainly a foreground object.

Based on a recessional velocity of 4010 km/sec, NGC 4185 is about 185 million light years away. Given that and its 1.8 by 0.4 arcmin apparent size, it is about 100 thousand light years across. NGC 4169, 4174 and 4175 may form a physical as well as an apparent triplet; but NGC 4173 is almost certainly a foreground object.

Based on recessional velocity of 2115 km/sec, about 95 million light years away, in good agreement with redshift-independent distance estimates of 55 to 105 million light years. Given that and apparent size of 2.4 by 1.7 arcmin, about 65 thousand light years in diameter.

The "recessional" velocity of -140 km/sec (which would mean it is actually approaching our galaxy) is useless as a distance indicator (even a conflicting value of +785 km/sec is too small, in comparison with peculiar (non-Hubble expansion) velocities to be a reliable indicaor), but redshift-independent distance estimates fix its distance as about 55 million light years, give or take 10 million light years. Given that and its apparent size of 9.8 by 2.8 arcmin, it is about 150 thousand light years across. The galaxy is also a Seyfert galaxy (type SyLINER).

Based on recessional velocity of 2480 km/sec, about 110 million light years away, in good agreement with redshift-independent distance estimates of 95 to 135 million light years. Given that and apparent size of 2.65 by 0.95 arcmin, about 85 thousand light years in diameter.