NGC/IC Project Restoration Effort

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NGC7084

 

Basic Information


Location and Magnitude


Right Ascension: 21:32:33.0
Declination: +17:30:30
Constellation: PEG
Visual Magnitude:

Historic Information


Discoverer: Herschel J.
Year of discovery: 1825
Discovery aperture: 18.3

Observational


Summary description: Cl, lC
Sub-type: *Grp

Corwin's Notes

===== NGC 7084. JH calls this simply "A coarse scattered cluster." There is nothing obvious at his position, but about 30 seconds following there is indeed a cluster matching his description. JH has noted that the positions from his early sweeps are more untrustworthy than those from his later ones; this, from Sweep 12 on 11 October 1825, seems to be an example. Examining this on the POSS1 shows that it extends on to the north and east from the core that JH apparently saw. The overall size is 18 arcmin by 16 arcmin, while the core is 10 arcmin by 9 arcmin. This cluster stands out pretty well on the POSS prints, so RNGC's "no cluster" is a bit surprising. ----- Looking at this on the DSS2R nearly 16 years after my note above from July 2000, I see a slightly different configuration for the cluster. There seem to be two lobes, northern and southern, with JH's NPD more nearly aligned with the southern. The northern clump, however, has brighter stars and is a bit more compressed on the sky; I would think it would be more obvious at the eyepiece during sweeping. The sweep itself has no more in the way of a description than the words "Scattered coarse cl", and there is no error in the reductions. Without more guidance from JH's observation, I'm going to take the mean position of the two lobes for his cluster. I've also listed the positions for each lobe, too.

Steve's Notes

===== NGC 7084 17.5" (8/12/96): there is no clustering visible at JH's position but about 5' E is a mag 10 star that is within a 20' string of mag 10-13 stars oriented N-S. At the north and south end of this long string are two additional rows of stars oriented NW to SE and SW to NE, respectively, which intersect 10' E of the mag 10 star and together form the outline of a large isosceles triangle. The star at the north tip is a close faint triple star. Most of the stars in this scattered group form the triangle with very few in the central portion. Does not appear to be a cluster but rather a unimpressive random grouping, noticeably aligned in lanes. Listed as nonexistent in RNGC.