NGC/IC Project Restoration Effort
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NGC171
![](Images/negative_NGC171-ngcicproject.jpg)
Basic Information
Location and Magnitude
Right Ascension: 0:37:21.5
Declination: -19:56:4
Constellation: CET
Visual Magnitude: 12.2
Historic Information
Discoverer: Herschel W.
Year of discovery: 1784
Discovery aperture: 18.7
Observational
Summary description: vF, pL, lE, 2 pB st sf
Sub-type: SBab
Corwin's Notes
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NGC 171 = NGC 175. Dreyer (1912, WH's collected papers) tells us that CH made
a 1 degree error while reducing the position of III 223. There is certainly
nothing in the place given in NGC, though the identity with III 223 carries
two question marks. Auwers has the correct declination in his published
reduction of WH's observations.
The spare number comes from GC. Unfortunately, JH has no note there telling
us why he put the number in. However, in CGH, he notes the 1 degree
difference in the polar distances between III 223 and h2334 (N175) while again
putting a question mark on the number from his father's catalogue. Enough
doubt apparently remained in his mind about the identity that he put two
entries into GC, both of which Dreyer copied into the NGC. Dreyer checked
back into WH's manuscripts while working on the Collected Papers, and found
CH's error.
Steve's Notes
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NGC 171
See observing notes for NGC 175.