Observation by Simon Paul Davis: PuWe1 Faint Planetary in Lynx

Uploaded by

Simon Paul Davis

Observer

Simon Paul Davis

Observed

2025 Mar 02 - 23:30

Uploaded

2025 Mar 15 - 18:00

Objects

PN-G158.9+17.8

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Constellation

Lynx

Field centre

RA: 06^h19^m
Dec: +55°37'
Position angle: -104°22'

Field size

1°22' × 0°53'

Equipment

Sharpstar HNT15028 150mm Newtonian
ASI1600MM Pro (-10 C)
OAG with ASI2900MM
Ha and Oiii 4nm filters

Exposure

12 x 600 Seconds Guided, Ha and Oiii

Location

Hampshire

Target name

PuWe1

Title

PuWe1 Faint Planetary in Lynx

About this image

This is by far the faintest target that I have attempted so far. It was discovered in 1980 by two Astronomers and designated after their surnames as Purgathofer-Weinberger 1 or PuWe1 for short. It is also known as PN G158.9+17.8. It is one of the largest but faintest Planetary Nebulae in the skies with a diameter of 20 arc minutes. The Ha signal is equivalent to a magnitude 8.6 star spread across a circle of 20 arc minute diameter. The Oiii is even weaker with the equivalent of a magnitude 11.6 star.

In order to gain as much signal as possible I choose to use 10 minute exposures in both Ha and Oiii and pushed the gain of my ASI1600MM camera from unity gain of 139 to 300. There is quite a bit of noise in the resultant image but for 4 hours of exposure it seems to have worked quite well.

Files associated with this observation

PuWe1_small.jpg (734.1 kB)

Like this image

Paul Whitmarsh, Graham Winstanley, Callum Potter, Andy Wilson, Miguel Araújo, Dominic Ford, Karen Smith

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