NGC/IC Project Restoration Effort

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NGC7756

 

Basic Information


Location and Magnitude


Right Ascension: 23:48:28.5
Declination: +4:7:32
Constellation: PSC
Visual Magnitude: 12.8

Historic Information


Discoverer: Parsons L.
Year of discovery: 1873
Discovery aperture: 72.0

Observational


Summary description: Neb, 5' sp h 2270
Sub-type: *

Corwin's Notes

===== NGC 7756. Ralph Copeland (or perhaps the fourth Earl of Rosse, if he was observing the night of 11 December 1873) puts this object five arcminutes southwest of NGC 7757 using the Birr Leviathan. The original description reads in full "Another neb about 5' sp." Not much to go on! There is a star in the area that was taken by MCG and RC1 as N7756, and I've put a colon on it as it seems the most likely object. However, Copeland also has measures of two other stars just north of N7757 in his observation. Both of them are about the same magnitude as the star to the southwest. This makes me wonder why LdR didn't see them as nebulae as well. It also lead me to poke around the area a bit. There is a close double star -- quite faint, though -- closer to N7757, and a somewhat brighter and much wider double further south. Neither seems a likely candidate to me, but there isn't much else around that LdR could have seen with the Leviathan. Earlier, I had also suggested a star with a "faint galaxy" at 23 48 29.17, +04 02 52.8 (J2000; HCsv; previous approximate coordinates were 28.7 and 57 for the seconds of time and arc). The "galaxy" is a defect on the blue POSS1 plate, and the star by itself would not attract attention. So, I've deleted the object from the position table.