Hemisphere:  Northern  ·  Constellation: Lynx (Lyn)
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100 hours of Planetary Nebula PuWe 1, 



    
        

            Ross Walker

100 hours of Planetary Nebula PuWe 1

Getting plate-solving status, please wait...
100 hours of Planetary Nebula PuWe 1, 



    
        

            Ross Walker

100 hours of Planetary Nebula PuWe 1

Technical card

Imaging telescopes or lenses: TS OPTICS Photoline 130 F/7 Triplet APO

Imaging cameras: ZWO ASI 1600MM-Pro (Mono)

Mounts: iOptron CEM60  ·  Sky-Watcher EQ8

Guiding telescopes or lenses: TS OPTICS Photoline 130 F/7 Triplet APO

Guiding cameras: ZWO ASI120MM-Mini

Focal reducers: TS Optics PHOTOLINE 3" 0.79x Reducer/Flattener

Software: Pleiades PixInsight  ·  Sequence Generator Pro

Filters: Chroma OIII (3nm)  ·  Chroma Ha (3nm)


Dates:Nov. 16, 2019

Frames:
Chroma Ha (3nm): 609x360" (gain: 139.00) -25C bin 1x1
Chroma OIII (3nm): 393x360" (gain: 139.00) -25C bin 1x1

Integration: 100.2 hours

Avg. Moon age: 18.62 days

Avg. Moon phase: 84.07%

Bortle Dark-Sky Scale: 5.00

Mean SQM: 19.60


Basic astrometry details

Astrometry.net job: 3449759

RA center: 6h 19' 32"

DEC center: +55° 37' 30"

Pixel scale: 1.058 arcsec/pixel

Orientation: 89.142 degrees

Field radius: 0.802 degrees


Resolution: 4381x3259

Locations: Home observatory, Otsu, Shiga, Japan

Data source: Backyard

Description

Please say hello to the planetary nebula Purgathofer-Weinberger 1 (PuWe 1). This giant, circular, low surface brightness nebula, located in the constellation of Lynx, is one of the largest planetary nebulae in our skies, and was discovered in 1980 by A. Purgathofer and R. Weinberger while they were searching Palomar sky survey (POSS E) plates. Their published paper on this discovery can be found here.

The central star is thought to be the white dwarf WD0615+556, the blue member of a red/blue optical double star; you can see them both at the centre of my image above.

With the light domes of Osaka to the south, Kyoto to the west, and Otsu to the east, 100 hours of data does not go far in these Bortle 5 skies. PuWe 1 is only faintly visible in a 6 minute Ha sub, and nothing is visibly in an OIII sub of the same duration. Purgathofer and Weinberger estimate its surface brightnesses to be 23.7 mag/arc-sec² and 26.3 mag/arc-sec² respectively, so we're talking faint! Its distance from earth is similar to that of the Helix Nebula, and based on this and its large diameter of around 1,200 arc-seconds, it is, quote, "a remarkably old nebula".

Imaged over six months from November 2019 to April 2020, PuWe 1 is presented here as an Ha/OIII/OIII combination.

Other IDs:
Purgathofer-Weinberger 1;
Gaia DR2 997854527884948992;
PK 158+17 1;
PN G158.9+17.8;
PN PuWe 1;
WD 0615+556;
1SWASP J061934.22+553642.9;

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100 hours of Planetary Nebula PuWe 1, 



    
        

            Ross Walker