Hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  PK081-14.1
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Abell 78 (PK 081-14.1), 



    
        

            Luca Marinelli
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Abell 78 (PK 081-14.1)

Getting plate-solving status, please wait...
Abell 78 (PK 081-14.1), 



    
        

            Luca Marinelli
Powered byPixInsight

Abell 78 (PK 081-14.1)

Imaging telescopes or lenses: Teleskop Service ONTC 10" f4 Newton

Imaging cameras: ZWO ASI1600MM Pro

Mounts: Astro-Physics 1100GTO

Guiding telescopes or lenses: Teleskop Service ONTC 10" f4 Newton

Guiding cameras: Starlight Xpress Ultrastar Mono

Software: Denoise AI  ·  Main Sequence Software Sequence Generator Pro Sequence Generator Pro  ·  Starnet ++  ·  Astro-Physics Command Center (APCC) Pro Software  ·  Photoshop CC  ·  PIXINSIGHT 1.8  ·  PHD2 Guiding PHD2 v2.6.5

Filters: Astrodon Tru-Balance Gen2 E-Series - R 36mm  ·  Astrodon Narrowband 3nm Ha  ·  Astrodon Tru-Balance Gen2 E-Series - B 36mm  ·  Astrodon Tru-Balance Gen2 E-Series - G 36mm  ·  Astrodon Narrowband 3nm OIII

Accessory: QHYCCD OAG-M  ·  Tele Vue Paracorr Type 2  ·  Pegasus Astro Ultimate Power Box  ·  QHYCCD QHYCFW3-M


Dates:Aug. 23, 2020Sept. 14, 2020Nov. 3, 2020Nov. 29, 2020Dec. 18, 2020

Frames:
Astrodon Tru-Balance Gen2 E-Series - B 36mm: 13x60" (13') (gain: 50.00) bin 1x1
Astrodon Tru-Balance Gen2 E-Series - G 36mm: 29x60" (29') (gain: 50.00) -15C bin 1x1
Astrodon Tru-Balance Gen2 E-Series - R 36mm: 24x60" (24') (gain: 50.00) -15C bin 1x1
Astrodon Narrowband 3nm Ha: 171x360" (17h 6') (gain: 139.00) -15C bin 1x1
Astrodon Narrowband 3nm OIII: 240x360" (24h) (gain: 139.00) -15C bin 1x1

Integration: 42h 12'

Darks: ~50

Flats: ~20

Flat darks: ~50

Bias: ~100

Avg. Moon age: 13.31 days

Avg. Moon phase: 49.32%

Bortle Dark-Sky Scale: 5.00


Astrometry.net job: 4107279

RA center: 21h 35' 29"

DEC center: +31° 41' 53"

Pixel scale: 0.686 arcsec/pixel

Orientation: -91.126 degrees

Field radius: 0.269 degrees


Resolution: 2272x1682

Locations: Home Observatory, Schenectady, New York, United States

Data source: Backyard

Description

Abell 78 (PK 081-14.1, PN G 081.2-14.9) is a planetary nebula in the constellation Cygnus discovered in 1966 by George Abell. It spans 1.4 light years in diameter and is located roughly 5,300 light years away. Planetary nebulae are formed by the expanding gas shell around a white dwarf progenitor star, the late-stage evolutionary phase of small to medium size stars, not massive enough to explode into a supernova. Having exhausted the nuclear fuel in their cores, these stars collapse to become dense white dwarfs.

What is unusual about the white dwarf star visible at the center of Abell 78 is that it has reignited and come back to life, hence the moniker 'born-again star'. Only a handful of such born-again stars have been discovered. Although nuclear burning of hydrogen and helium had stopped in the core of the dying star, some of the star's outer layers became so dense that fusion of helium resumed there.

The renewed nuclear activity started another much faster stellar wind, blowing more material away. The interplay between the old and new outflows has shaped the cloud's complex structure.

Abell 78 is a small planetary nebula (113"x88"), the smallest deep-sky object I have imaged so far. In spite of its reasonable brightness, I collected a significant amount of data to allow me to stretch the background and select low-FWHM subs to highlight the intricate structure of this small DSO. The hydrogen and faint oxygen emissions in the background sky surrounding the nebula are not often visible in amateur images.

References:

http://www.esa.int/ESA_Multimedia/Images/2015/07/Born-again_planetary_nebula
J.B. Kaler & W.A. Feibelman, The central star of the planetary nebula Abell 78, Astrophysical Journal 282 (1984), 719-727.

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    Abell 78 (PK 081-14.1), 



    
        

            Luca Marinelli
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            Luca Marinelli
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Abell 78 (PK 081-14.1), 



    
        

            Luca Marinelli