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The Herschel 400 list has a couple of questionable entries. NGC's 2371 and 2372 are different portions of the same planetary nebula, M76.

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M76 (NGC 650/651) is located in Perseus. NGC 2371/72 is located in Gemini.

http://messier.seds.org/m/m076.html

http://observing.skyhound.com/archives/feb/NGC_2371.html

Dave Mitsky

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I do not know why NGC 2371-2 would be such a questionable object to view. O'Meara viewed both parts of this planetary nebula in his 4-inch TV refractor telescope. See page 76 in O'Meara's Herschel 400 Observing Guide.

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I recommend adding NGC 4039 and NGC 4340 to the list to bring it back up to a nice round total of 400 discreet celestial objects. Both galaxies were observed and cataloged by Herschel, and both are adjacent to objects in the official Herschel 400 list. You're gonna observe them, anyway, so might as well count them as part of the program.

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And good additions they would be too, but you should contact the Astronomical League to revise the real list that started the Herschel 400 program. There are many Herschel 400 lists out there, but only the Astronomical Leagues really counts if you wont any recognition for completing the list.

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...some of the mystery objects.

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What are these confusing mystery objects? The only mystery object that I know of, in the Herschel 400, is NGC 6882 and it is most likely a duplicate observation of NGC 6885. Are there any other problem objects here with the Herschel 400, not in the Herschel II list?

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And for those of us who're "fortunate" enough to live in high northern latitudes, FDSS (Finnish Deep Sky Section) has Herschel 400 North which is "better" suited for such locations. It does have many of the same objects as the original H400 list (of course).

/Jake

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