Based on recessional velocity of 4385 km/sec, about 200 million light years away. Given that and apparent size of 1.7 by 0.3 arcmin, about 95 thousand light years in diameter.

Based on a recessional velocity of 1380 km/sec, NGC 3664 is about 64 million light years away, in reasonable agreement with a redshift-independent distance estimate of 80 million light years, given possible errors due to peculiar (non-Hubble-expansion) velocities. Given that and its apparent size of 2.0 by 1.9 arcmin, it is about 40 thousand light years across. NGC 3664 is probably gravitationally interacting with PGC 35042, which is often referred to as NGC 3664A.

Based on a recessional velocity of 1325 km/sec, PGC 35042 is about 62 million light years away. This and its apparent proximity to NGC 3664 has led to its being also referred to as NGC 3664A. If the two galaxies are at the same distance, they are separated by less than 120 thousand light years, in which case PGC 35042 may be a gravitationally bound companion to NGC 3664, and their peculiar appearance may be due to gravitational interactions (in fact, it is generally assumed that the two galaxies are indeed an interacting pair). Given its estimated distance and apparent size of 0.8 by 0.8 arcmin, PGC 35042 is about 15 thousand light years across.

Per Dreyer, NGC 3695 (= Ball, using Lord Rosse's Leviathan, 1860 RA 11 21 23, NPD 53 44.4) is "extremely faint, pretty small, h899 4 arcmin to south". The position precesses to RA 11 28 53.8, Dec +35 29 22, which is 4 arcmin to the north of NGC 3694 (= William Herschel's #899, or "h899"); but there is nothing near the listed position, save for a 15th-magnitude star. However, per Corwin, the error is due to Dreyer, not Ball. Ball did not record the actual position of his discovery; instead, he gave the relative positions of the two nebulae about 6 arcmin northeast of h899. Those positions correspond to NGC 3695 and 3700, which are therefore properly credited to him. The double listing was caused by Dreyer mistakenly thinking the 15th-magnitude star was Ball's object, and that his own observation of NGC 3695 was of a previously unobserved nebula. In other words, the incorrect position for NGC 3695 was not due to Ball, but Dreyer; but whatever the reason, it resulted in a double listing for the galaxy. Based on a recessional velocity of 10355 km/sec, NGC 3695 is about 480 million light years away. Given that and its apparent size of 1.1 by 0.7 arcmin, it is about 150 thousand light years across. In the images below the galaxy seems somewhat distorted, and apparently has a double nucleus; whether that is really the case, or is due to a foreground star, might warrant some investigation.

For now, see NGC 3695 for a discussion of the double listing, and images of the region