Only a small portion of Leo is on this chart. In fact, only 4 galaxies will be discussed in this entry. I use a 12" Dobsonian scope from Orion. Observations here were carried out in 2018.
eg 3685: 0'.6 x 0'.3: Vis. 14.1; SB 12.3: A pinpoint map is required to locate this tiny faint oval smudge, conveniently located preceding 2 mag. 14 stars. It was seen only with a.v., and then only intermittently, at 375x. A real challenge for a 12" scope, but doable on a fine night.
eg 3716: 0'.7 x 0'.6: Vis. 13.5; SB 12.5: Yet another hand drawn sketch helped me find this out of the way galaxy, which was seen at 84x, sitting between two brighter stars. The galaxy is located mid-way between the stars, and just off-line (preceding). At 136x it is faint, small, but quite easy to identify. At 187x there are fairly good views using a.v. The galaxy now appears slightly oval. At 250x it is still small and somewhat ghostly in appearance, but distinct from the background sky.
eg 3719: 1'.8 x 1'.3: Vis. 13; SB 13.8: A pair with eg 3720, below. Both galaxies were seen at 84x. At 136x they were cleaner, brighter, and larger. 19 is much larger and fainter, making 20 easier to see. At 187x 20 pops right out at the viewer, while 19 takes a bit longer to come forth. The latter is now big and oval. At 250x both galaxies are sowing bright cores, but 19 is beginning to fade. Still, they make a fun pair in a 12" mirror.
eg 3720: 1' x 0'.9: Vis. 13; SB 12.7: A pair with 3719. See above.
This completes the lower and middle charts of Leo on Uranometria. Next we turn north, beginning on Chart 74....
Mapman Mike
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