Planetary Nebula PK 47+42.1 (Abell 39)

Basic object information
Object name: PK 47+42.1
Object type: Planetary nebula
Magnitude: 12.9
Size: 2.9'
Magnitude of central star: 15.8
Object classification: 2c

Catalog information
RA (J2000.0): 16h 27m 30.0s
Dec (J2000.0): +27° 54' 00"

Constellation: Hercules

Observer: Iiro Sairanen
Obs. place: Haakanala, Rautjärvi, Finland
Date/time: 19/20.8.2010 0:30

Telescope: Newton 457/2280 mm

Magn:	134x	Filter:	O-III
Field:	30'	NE Lim.mag:	7.0
SQM:	21.5 (2)	Seeing:	2
Visuality:	V	Height:	32°
Weather:	+8°C, astronomical twilight

A very difficult round planetary nebula. Visible with an O-III which shows a thin ring with averted vision. Stars, including central star, have been drawn without filter and higher magnification.