Based on recessional velocity of 1305 km/sec, about 60 million light years distant, in good agreement with a redshift-independent distance estimate of 65 million light years. Given that and apparent size of 2.3 by 1.2 arcmins, about 40 thousand light years in diameter.

Listed in the Arp Atlas as an example of a spiral galaxy with a faint companion (the small galaxy at lower left). Based on recessional velocity of 5575 km/sec, the spiral is about 250 million light years distant. Given that and apparent size of 1.8 by 1.4 arcmins, about 130 thousand light years in diameter. The 17th-magnitude companion 2MASX J10241018+1643557 (the 2MASS name being based on its position of RA 10 24 10, Dec +16 43 56) appears to be an irregular spiral. If it is indeed a companion, and not a background galaxy, its apparent size of 0.14 by 0.12 arcmin would correspond to 10 thousand light years.

Listed in the Arp Atlas as an example of a spiral galaxy with a faint companion (the small galaxy below it). However, it appears that there is no real connection between the two, as the radial velocity of the "companion" places it nearly 400 million light years beyond the larger galaxy. Based on recessional velocity of 5540 km/sec, IC 609 is about 250 million light years distant, in reasonable agreement with redshift-independent distance estimates of 220 to 235 million light years, while PGC 1097822's recessional velocity of 14190 km/sec places it 630 million light years away. Given that, the 1.5 by 0.7 arcmin apparent size of IC 609 implies that it is 110 thousand light years across; while the 0.38 by 0.32 arcmin apparent size of PGC 1097822 suggests a size of 70 thousand light years.

Per Dreyer, NGC 3279 (= Todd (#30), 1860 10 25 30 (approx), NPD 78 04) is "faint, much extended". Per Dreyer, IC 622 (= Swift 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 9th-magnitude star is to the north). This suggests that Steinicke's 2011 database listing Todd as the discoverer of IC 622, although correct since it is identical to NGC 3279, is misleading in terms of the original historical data. Note: Corwin has a detailed discussion of the identity. Thomson also does, which is where the listing number for Swift comes from.