Object ID error NGC 6884
TedF Feb 12, 2012
I'm new to the group so forgive me if this has been discussed before. I want to report a misidentification, or at least, what is a misidentification from my point of view.
The planetary nebula at R.A. 20 10 23.66 Dec +46 27 39.8 in Cygnus is usually identified as NGC 6884. In Guide 9.0 it is identified as NGC 6766. The two are identical objects (N6884=N6766). The problem arises in that NGC 6766 was recorded in the NGC with an error in position. Selecting a GO TO using NGC 6884 yields NGC 6766 and produces the following "More Info":
Comments from the NGC-IC Project:
RA: 19 10 00.0 (J2000)
declination: +46 19 00
Right ascension: 20h10m23.7s
Declination: +46 27' 41"
Remarks from the NGC2000 Catalog:
J2000 RA: 19h09.9m
J2000 dec: +46 15'
PN , stellar
NGC 6766: planetary nebula, stellar
Comments from SAC (Saguaro Astronomy Club) 7.2 database:
Object type: NONEX
RA: 19 09.9 (J2000)
declination: +46 15
SIMBAD lists this object with a primary ID of NGC 6884, with the correct R.A. of 20hrs (vice 19hrs) placing it in the correct constellation of Cygnus (vice Lyra) and includes the following note:
"NGC 6884 = NGC 6766: 20 10 23.66 +46 27 39.8 (J2000, 2MASS)NGC 6884 was discovered by Edward Pickering (1883AN...105...335P), but the published position was wrong. The error was mentioned by Espin(1911MNRAS..72..150E) which noticed that NGC 6884 = NGC 6766. Pickering confirmed the error as a typo in the AN journal. Dave C Riddle (mail forwarded by Brian Skiff)"