NGC/IC Project Restoration Effort

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NGC6693

 

Basic Information


Location and Magnitude


Right Ascension: 18:41:32.0
Declination: +36:54:54
Constellation: LYR
Visual Magnitude:

Historic Information


Discoverer: Marth
Year of discovery: 1864
Discovery aperture: 48.0

Observational


Summary description: vF
Sub-type: NF

Corwin's Notes

===== NGC 6693 may be identical to NGC 6692. There are only faint stars in the area of Marth's position for N6693. The RNGC claims the object to be a star, but I see no particular single, double, or multiple star around that might have caught Marth's eye. Of the nine other objects that Marth found the same night ("1864.59"), two bracket N6693 in RA, and are at similar Dec's: N6688 and N6713. Neither has a large offset in Marth's position from the modern positions, so I have to presume that N6693 is also unaffected by any systematic error. However, this does not preclude an accidental error. Candidate galaxies include NGC 6692 with a +1 second and +2 degree 4 arcmin error in the position (at B1860), CGCG 201-030 (with a +26 second and +1 degree 53 arcmin error), and CGCG 201-035 (with +1 minute and 3 seconds and +1 degree 18 arcmin error). CGCG 201-030 has a couple of similarly bright stars quite close to the north and east that Marth might have commented on, so I don't think this is a good match. CGCG 201-035 is also in a fairly rich field, but there are no really eyecatching stars nearby. Its larger RA error and non-integer Dec error also takes it out of real contention. So, I'm inclined toward the identity with NGC 6692 -- it is within Marth's usual errors of being just 2 degrees off his position. But given his scanty description "vF", this could be a stretch. So, I've put question marks on the identity.