Cookie consent

AstroBin saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing AstroBin without changing the browser settings, you grant us permission to store that information on your device.

I agree
Getting plate-solving status, please wait...

Abell 39 O3LRGB

Technical card


Dates:June 1, 2018

Frames:
Baader Blue 36 mm: 29x180" bin 1x1
Baader Green 36 mm: 19x180" bin 1x1
Baader Luminance 36 mm: 25x180" bin 1x1
Baader Red 36 mm: 19x180" bin 1x1
Baader OIII 8.5nm 36mm: 48x1800" bin 1x1

Integration: 28.6 hours

Avg. Moon age: 17.41 days

Avg. Moon phase: 92.29%


Basic astrometry details

Astrometry.net job: 2913343

RA center: 16h 27' 34"

DEC center: +27° 54' 36"

Pixel scale: 2.140 arcsec/pixel

Orientation: 175.333 degrees

Field radius: 0.546 degrees


Resolution: 1300x1300

Locations: Remote observatory, Kiev, Ukraine

Data source: Own remote observatory

Remote source: Non-commercial independent facility

Description

Abell 39 is a low surface brightness planetary nebula in the constellation of Hercules. It is estimated to be about 6,800 light-years from earth. It is almost perfectly spherical and also one of the largest known spheres with a radius of about 2.5 light-years.

Its central star is slightly west of center by about 2″ or 0.1 light-years. This offset does not appear to be due to interaction with the interstellar medium, but instead, it is hypothesized that a small asymmetric mass ejection has accelerated the central star. The mass of the central star is estimated to be about 0.61 M☉ with the material in the planetary nebula comprising an additional 0.6 M☉. The central star is classified as a subdwarf O star.

This planetary nebula has a nearly uniform spherical shell. However, the eastern limb of the nebula is 50% more luminous than the western limb. Additionally, irregularities in the surface brightness are seen across the face of the shell. The source of the east-west asymmetry is not known but it could be related to the offset of the central star.

This planetary nebula has been expanding for an estimated 22,100 (+1700−1500) years, based on an assumed expansion velocity between 32 and 37 km/s and a 0.78 parsec radius.
(c) Wikipedia

Comments

Author

Sergiy_Vakulenko
Sergiy_Vakulenko
License: Attribution Creative Commons
4197
Like

Revisions

B

Description: Pure OIII

Sky plot

Sky plot

Histogram

Abell 39 O3LRGB, 



    
        

            Sergiy_Vakulenko