Based on a recessional velocity of 1305 km/sec, IC 600 is about 60 million light years away, in good agreement with a redshift-independent distance estimate of 65 million light years. Given that and its apparent size of 2.5 by 1.2 arcmins, it is about 45 thousand light years across.

Apparent size 0.7 by 0.3 arcmin. A probable companion of IC 602.

Apparent size 0.9 by 0.6 arcmin. A probable companion of IC 601, which see for images.

Apparent size 1.3 by 0.75 arcmin.

Per Dreyer, IC 604 (Swift list IX (#22), 1860 RA 10 14 32, NPD 32 16.0) is "most extremely faint, very small, very much extended (perhaps several faint stars in a line)". The position precesses to RA 10 23 46.8, Dec +57 01 41, right on the galaxy, so the identification is certain. Per Corwin both the NGC and IC positions are good, so Swift must have simply failed to check the NGC, and Dreyer didn't catch the probable duplication. (See NGC 3220 for anything else.)

Apparent size 0.7 by 0.55 arcmin.

Per Dreyer, IC 606 (Javelle #676, 1860 RA 10 16 08, NPD 78 20.3) is "very faint, very small, round, diffuse". The position precesses to RA 10 23 34.1, Dec +10 57 19, less than half an arcmin southeast of the galaxy, so the identification is certain. For a discussion of the double listing (and anything else) see NGC 3217.

Listed in the Arp Atlas as an example of a spiral galaxy with a faint companion (the small galaxy at lower left). Based on a recessional velocity of 5575 km/sec, IC 607 is about 260 million light years away. Given that and its apparent size of 2.0 by 1.3 arcmins, about 150 thousand light years across. Its 17th-magnitude apparent companion 2MASX J10241018+1643557 (the 2MASS name being based on its position of RA 10 24 10.2, Dec +16 43 57) appears to be an irregular spiral. Its recessional velocity and actual distance are unknown, but if it is an actual companion, and not a foreground or background galaxy, its apparent size of 0.16 by 0.12 arcmin would correspond to 12 thousand light years.

Based on a recessional velocity of 11240 km/sec, a straightforward calculation indicates that IC 608 is about 520 million light years away. However, for objects at such distances we should take into account the Universal expansion during the time it took their light to reach us. Doing that shows that the galaxy was about 500 million light years away at the time the light by which we see it was emitted, about 510 million years ago (the difference between the two numbers being due to the expansion of the intervening space during the light-travel time). Given that and its apparent size of 0.8 by 0.55 arcmin, it is about 115 thousand light years across.

Listed in the Arp Atlas as an example of a spiral galaxy with a faint companion (the small galaxy below it). However, there is no real connection between the two, as the radial velocity of the "companion" (PGC 1097822) places it nearly 400 million light years beyond the closer galaxy. Based on a recessional velocity of 5540 km/sec, IC 609 is about 260 million light years distant, in fair agreement with redshift-independent distance estimates of 220 to 235 million light years. Given that and its apparent size of 1.6 by 0.8 arcmin, it is about 120 thousand light years across.

Based on a recessional velocity of 14385 km/sec, a straightforward calculation indicates that PGC 1097822 is about 670 million light years away. However, for objects at such distances we should take into account the Universal expansion during the time it took their light to reach us. Doing that shows that the galaxy was about 635 million light years away at the time the light by which we see it was emitted, about 650 million years ago (the difference between the two numbers being due to the expansion of the intervening space during the light-travel time). Given that and its apparent size of 0.32 by 0.32 arcmin, it is about 60 thousand light years across. Although "part" of Arp 44, it has no actual connection with IC 609 (which see for images), since it is hundreds of millions of light years further away.

Per Dreyer, IC 610 (Swift list VIII (#53), 1860 RA 10 18 36, NPD 69 03.6) is "most extremely faint, pretty small, considerably extended, extremely difficult". The position precesses to RA 10 26 15.3, Dec +20 13 48, about 13 seconds of time west of the galaxy in question, but the description makes the identification certain. As discussed in the entry for IC 611, although the position for that observation was more accurate, precedence is generally given to the earliest observation, so although the galaxy is referred to as IC 611 in some places, the correct designation is IC 610. Apparent size 1.9 by 0.3 arcmin.

Per Dreyer, IC 611 (Swift list VIII (#54), 1860 RA 10 18 46, NPD 69 02.6) is "extremely faint, small, a little extended". The position precesses to RA 10 26 25.3, Dec +20 14 47, just northwest of the galaxy, and between that and the description the identification is certain. Swift's more accurate position for IC 611 has led to some references listing the galaxy by that designation, but precedence is generally given to the earliest observation, so it is more properly called IC 610 (which see for anything else).

Apparent size 0.7 by 0.4 arcmin.

1.1 by 1.1 arcmin.

Apparent size 0.9 by 0.55 arcmin. A Seyfert galaxy (type Sy 2). Probably a collisional ring galaxy.

Apparent size 1.2 by 0.35 arcmin.

Apparent size 0.9 by 0.9 arcmin. (Note: PGC 3090487, the apparent companion an arcmin to the south of IC 616, is an optical double nearly a thousand million light years further away.)

Based on a recessional velocity of 25205 km/sec, a straightforward calculation indicates that PC 3090487 is about 1175 million light years away. However, for objects at such distances we should take into account the Universal expansion during the time it took their light to reach us. Doing that shows that the galaxy was about 1065 million light years away at the time the light by which we see it was emitted, about 1110 million years ago (the difference between the two numbers being due to the expansion of the intervening space during the light-travel time). Given that and its apparent size of 0.3 by 0.2 arcmin, it is about 95 thousand light years across. Since the galaxy is nearly a thousand million light years further away than IC 616, there is no actual connection between them.

Per Dreyer, IC 617 (Javelle #179, 1860 RA 10 25 51, NPD 101 55.9) is "very faint, very small, round, brighter middle". The position precesses to RA 10 32 45.6, Dec -12 39 03, just over an arcmin south of NGC 3280; and since Javelle's #180, observed on the same night, is just under an arcmin south of NGC 3296, the relative positions make the identification of Javelle's two "novae" with the NGC objects certain. (Note: Corwin states that Javelle's position falls within arcseconds of the center of the western component of NGC 3280, for which reason IC 617 is generally considered to be only that component of the NGC object; but if so, there must have been an error in the catalog position of Javelle's comparison star (BD-11 2902) that has been taken into account without any comment.) The duplicate listing was caused by poor positions for the NGC identifications, but despite the presumably greater accuracy of Javelle's measurements, precedence is generally given to the earliest observation, so for anything else see NGC 3280.

Per Dryer, IC 618 (Javelle #180, 1860 RA 10 25 51, NPD 102 00.6) is "faint, small, extended east-west, a little brighter middle". The position precesses to RA 10 32 45.5, Dec -12 43 45, just under an arcmin south of NGC 3296, and since Javelle's #179, observed on the same night, is just over an arcmin south of NGC 3280, the relative positions make the identification of Javelle's two "novae" with the NGC objects certain. (Also see Corwin's note about Javelle's position for IC 617, which involved the same comparison star.) As in the case of IC 617, the duplicate listing was caused by a poor position for the NGC identification, but despite the presumably greater accuracy of Javelle's measurements, precedence is generally given to the earliest observation, so for anything else see NGC 3296.

Per Dreyer, IC 619 (Swift list VIII (#55), 1860 RA 10 26 04, NPD 76 44.1) is "most extremely faint, small, round, 3 faint stars to east". Swift's original notes provide more detail about the stars "near to the east", stating that they form a pretty large triangle, with one being a very faint double. The position precesses to RA 10 33 30.7, Dec +12 32 42, but there is absolutely nothing that Swift could have seen anywhere near there. However, Swift's positions were obtained by crude methods (usually by simply checking the setting circles on his telescope, which were often poorly set or read), and are often considerably "off" (as noted by Dreyer in his comments on Swift's observations), so substantial positional errors are an unfortunately common problem with his "novae". The question is therefore whether there is any way to tell what he observed when it could be almost anywhere "near" his position. In this case (per Corwin) the description of the star field seems to firmly settle the matter, as the galaxy listed above has a triangle of stars to its east-southeast that exactly matches Swift's description. The position of the galaxy is 19 seconds of time and 20 arcmins different from Swift's position, which means that without the triangle, IC 619 would almost certainly be listed as lost or nonexistent, and there are catalogs that list it as such; but thanks to the triangle, the identification of IC 619 with PGC 31235 is reasonably certain, despite the large error in Swift's position. Apparent size 1.1 by 0.7 arcmin.

   Identification: Per Dreyer, IC 620 (Javelle #181, 1860 RA 10 26 08, NPD 77 24.8) is "very faint, very small". The position precesses to RA 10 33 33.8, Dec +11 52 00, only a quarter arcmin south of the brighter (southeastern) member of a pair of galaxies (the other being PGC 31215). Unfortunately (per Corwin), the fainter (northwestern) component is often misidentified as the IC object, but if Javelle had seen that galaxy, he would certainly have described the object as a "double". Other than that error, the identification therefore seems certain.
   Physical Information: The pair of galaxies have nearly identical recessional velocities (10080 km/sec for IC 620 and 10165 km/sec for PGC 31215) and appear distorted by a physical interaction, so they are almost certainly a physical pair. Based on their average recessional velocity of 10125 km/sec, a straightforward calculation indicates that they are about 470 million light years away. However, for objects at such distances we should take into account the Universal expansion during the time it took their light to reach us. Doing that shows that the pair was not quite 455 million light years away at the time the light by which we see them was emitted, a little over 460 million years ago (the difference between the two numbers being due to the expansion of the intervening space during the light-travel time). Given that and its apparent size of 0.5 by 0.3 arcmin, IC 620 is about 65 thousand light years across, and PGC 31215's apparent size of 0.35 by 0.15 arcmin corresponds to a size of about 45 thousand light years.

Almost certainly an interacting pair with the actual IC 620, which see for images and a historical discussion. As also discussed there the pair was about 455 million light years away when the light by which we see them was emitted, about 460 million years ago (the difference between the two numbers being due to the expansion of the intervening space during the light-travel time). Given that and its apparent size of 0.35 by 0.15 arcmin, PGC 31215 was about 45 thousand light years across at that time. Its interaction with IC 620 may have considerably changed its appearance since then, but since the light it is currently emitting won't reach us for nearly half a billion years, what we see now is about all we'll ever see.

   Identification: Per Dreyer, IC 621 (Javelle #684, 1860 RA 10 26 09, NPD 86 37.5) is "faint, small, round". The position precesses to RA 10 33 23.1, Dec +02 39 18, about 2.4 arcmin north of the galaxy listed above, and in fact closer to PGC 31197, which as a result is often misidentified as IC 621. Per Corwin, the error is due to an incorrect position for Javelle's comparison star (BD+3 2388, an 8th-magnitude star about 9 arcmin to the east), whose BD position is 2.4 arcmin north of its actual position. Correcting for that mistake places Javelle's #684 practically on top of PGC 31196, so the identification is certain.
   Physical Information: Apparent size 0.7 by 0.5 arcmin.

Apparent size 0.55 by 0.35 arcmin.

   Identification: Per Dreyer, IC 622 (= Swift list IX (#23), 1860 RA 10 27 10, NPD 78 04.7) is "very faint, pretty small, extended, 9th magnitude star to south" (this is an error, as the star is to the north). The position precesses to RA 10 34 34.8, Dec +11 12 01, a few seconds west of the galaxy, but there is nothing else nearby, and the description of the star field, though the position of the 9th magnitude star is reversed, makes the identification certain. (See NGC 3279 for images, a discussion of the duplicate listing, and anything else.)

Apparent size 1.2 by 0.45 arcmin.

Apparent size 2.5 by 0.55 arcmin.

(See Corwin; the problem being a reversal of the sign for the offset) Apparent size 2.1 by 0.5 arcmin.

Apparent size 1.3 by 1.0 arcmin. Nothing is known about its apparent companion, PGC 1025439, so whether they are in any way connected or merely an optical double is also unknown.

Apparent size 0.3 by 0.2 arcmin. Nothing else known, so whether it is in any way connected to IC 626 (which see for images) or merely an optical double is also unknown.

Apparent size 0.6 by 0.6 arcmin.

Apparent size 1.25 by 0.85 arcmin.

Per Dreyer, IC 629 (Bigourdan #158, 1860 RA 10 30 28, NPD 116 50) is "very faint, very small star involved, possible cluster". The position precesses to RA 10 37 02.9, Dec -27 33 30, right on the galaxy, so the identification is certain. Per Corwin, the duplicate listing has no obvious explanation, as Herschel's position is nearly identical, and Bigourdan himself noted the equality of the two entries in his "big" catalog (a compilation of all his observations). It may have been a simple oversight by Bigourdan and Dreyer, or they may have been misled by Herschel's statement that his polar distance was uncertain, and the presence of a relatively large number of NGC objects in the field (it is part of the Hydra Cluster of galaxies). In any event, there is no doubt of the equivalence with NGC 3312, which see for anything else.

Apparent size 1.4 by 0.9 arcmin. A starburst galaxy. 8th-magnitude HD 92200 lies almost directly in front of the galaxy, so glare from the star makes it hard to obtain good images.

Apparent size 0.6 by 0.55 arcmin.

Apparent size 1.0 by 0.65 arcmin.

Apparent size 0.8 by 0.4 arcmin.

Apparent size 1.3 by 0.35 arcmin.

Apparent size 1.4 by 0.45 arcmin.

Apparent size 1.05 by 0.45 arcmin.

Apparent size 0.9 by 0.65 arcmin.

Apparent size 0.8 by 0.7 arcmin.

Apparent size 1.0 by 0.3 arcmin.

Per Dreyer, IC 640 (Bigourdan #159, 1860 RA 10 38 56, NPD 54 31) is "very faint, pretty small, extended, double?". The position precesses to RA 10 46 49.7, Dec +34 44 51, whence the position above, but there is nothing there, save for glare from 8th-magnitude HD 93287, which may have led to the impression of a nebulous object (even modern photographs often show 'ghost' images near bright stars). Per Corwin, Bigourdan himself noted "This is, without doubt, a false image" for both this and his #160 (IC 641). So there is no doubt that this is a nonexistent object.

Per Dreyer, IC 641 (Bigourdan #160, 1860 RA 10 39 57, NPD 54 36) is "very faint, pretty small, diffuse". The position precesses to RA 10 47 50.0, Dec +34 39 47, whence the position above, but there is nothing there, but there is nothing there, save for glare from 9.5-magnitude HD 93449, which may have led to the impression of a nebulous object (even modern photographs often show 'ghost' images near bright stars). Per Corwin, Bigourdan himself noted "This is, without doubt, a false image" for both this and his #159 (IC 640). So there is no doubt that this is a nonexistent object.

Apparent size 2.0 by 1.8 arcmin.

Apparent size 1.0 by 0.35 arcmin.

Per Dreyer, IC 644 (Swift list IX (#24), 1860 RA 10 43 04, NPD 33 51.1) is "most extremely faint, pretty small, a little extended, bright star to southeast, southwestern of 2", the other being IC 646 (which is actually almost directly north of this). The position precesses to RA 10 51 40.0, Dec +55 24 28, about 1.5 arcmin northeast of the galaxy listed above, and the description fits perfectly, so the identity seems certain. However, there is a fainter galaxy (PGC 32587) a little further to the southeast, and although a far less likely candidate, it is sometimes listed as IC 644, so it is discussed immediately below.
   Note: Although it is reasonably certain that PGC 32564 is IC 644, whether it is also NGC 3398 (which see for anything else) is less certain, as discussed at that entry. However, since NGC 3398 is usually identified as PGC 32564, the equality with IC 644 is "standard" terminology.

Based on a recessional velocity of 22170 km/sec, a straightforward calculation indicates a distance of about 1030 million light years. However, for objects at such distances we should take into account the Universal expansion during the time it took their light to reach us. Doing that shows that the galaxy was about 950 million light years away at the time the light by which we see it was emitted, about 980 million years ago (the difference between the two numbers being due to the expansion of the intervening space during the light-travel time). Given that and its apparent size of 0.8 by 0.6 arcmin, it is about 220 thousand light years across.

Apparent size 0.4 by 0.4 arcmin.

Per Dreyer, IC 646 (Swift list IX (#25), 1860 RA 10 43 11, NPD 33 47.2) is "most extremely faint, pretty small, round, northeastern of 2", the other being IC 644 (which is actually almost directly south of this). The position precesses to RA 10 51 47.1, Dec +55 28 21, about 2 arcmin east of the galaxy listed above, and there is nothing else near, so the identification would be reasonably certain from the position alone. However, since the difference in declination given by Swift for IC 644 and 646 closely match those of the actual objects, the identification seems even more certain. Apparent size 1.0 by 0.8 arcmin.

Apparent size 0.6 by 0.3 arcmin.

Apparent size 0.75 by 0.55 arcmin.

Based on an average recessional velocity of 11600 km/sec (11575 km/sec for PGC 32506 and 11625 km/sec for PGC 93105), a straightforward calculation indicates that IC 649 is about 540 million light years away. However, for objects at such distances we should take into account the Universal expansion during the time it took their light to reach us. Doing that shows that the pair was about 515 million light years away at the time the light by which we see it was emitted, about 525 million years ago (the difference between the two numbers being due to the expansion of the intervening space during the light-travel time). Given that and its apparent size of 0.5 by 0.3 arcmin, the larger northern member of the pair (PGC 32506) is about 75 thousand light years across, while the smaller southern member (PGC 93105), with an apparent size of 0.25 by 0.15 arcmin, is about 40 thousand light years across.