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Abell 39 O3LRGB

Technical card

Dates:June 1, 2018

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 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


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



License: Attribution Creative Commons



Description: Pure OIII

Sky plot

Sky plot


Abell 39 O3LRGB,