A blogpost with more info and images about this object

largish and very dim, planetary nebula.PK 164+31.1, sometimes known as a "Jones-Emberson 1" has an angular diameter of 6', 67" x 6', 67" and it locates in constellation Lynx. Distance from my home town Oulu, Finland, is about 1600 light years.
The tiny Blue central star is a white dwarf, the intense ultraviolet light emitted by this star makes elements in a ring glow. Ionized Hydrogen emits red light and the ionized Oxygen blue one.

Why the name "PK 164+31.1"?
PK comes from the names of Czechoslovakian astronomers Perek and Kouhutec. 1967 they created an extensive catalog of all of the known planetary nebulae in 1964. The number indicates the position in the sky. The alternative name "Jones-Emberson 1" is after its discoveres.



Technical details




Processing work flow:

Image acquisition, MaxiDL v5.07.

Stacked and calibrated in CCDStack2.

Levels, curves and color combine in PS CS3.




Optics, Meade LX200 GPS 12" @ f5

Camera, QHY9

Guiding, SXV-AO, an active optics unit, and Lodestar guide camera 5Hz

Image Scale, ~0,8 arc-seconds/pixel




Exposures

H-alpha 21x1200s, binned 1x1 = 8h (A new set from the spring 2013.)
(Older sets from Spring 2010)
H-alpha 32x1200s, binned 2x2 and 7x1200s, binned 3x3 = 13h
O-III 2x600s, binned 4x4 and 1x1200s, binned 4x4 = 1h
O-III 15x1200s, binned 1x1, = 5h (A new set from the spring 2013.)
S-II 3x600s, binned 4x4 and 1x1200s, binned 4x4 = 1h 20min.
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Color exposures with QHY8 single shot color camera, spring 2013
48x600s exposures with UHC-sfilter = 8h