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Contains:  Owl nebula, M 97, NGC 3587, M 108, NGC 3556
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M97 & M108 HaO3LRGB, 


M97 & M108 HaO3LRGB

M97 & M108 HaO3LRGB

Technical card

Resolution: 2200x2200

Dates:May 31, 2019

Baader Blue 36 mm: 50x300" bin 1x1
Baader Green 36 mm: 30x300" bin 1x1
Baader Luminance 36 mm: 100x300" bin 1x1
Baader Red 36 mm: 30x300" bin 1x1
Baader Ha 7nm 36mm: 54x600" bin 1x1
Baader OIII 8.5nm 36mm: 56x600" bin 1x1

Integration: 35.8 hours

Avg. Moon age: 26.57 days

Avg. Moon phase: 9.60% job: 3055175

RA center: 11h 13' 16"

DEC center: +55° 17' 27"

Pixel scale: 2.140 arcsec/pixel

Orientation: 355.162 degrees

Field radius: 0.925

Locations: Remote observatory, Kiev, Ukraine

Data source: Own remote observatory

Remote source: Non-commercial independent facility


The Owl Nebula (also known as Messier 97, M97 or NGC 3587) is a planetary nebula located approximately 2,030 light years away in the constellation Ursa Major.

The nebula is approximately 8,000 years old. It is approximately circular in cross-section with a little visible internal structure. It was formed from the outflow of material from the stellar wind of the central star as it evolved along the asymptotic giant branch. The nebula is arranged in three concentric shells, with the outermost shell being about 20–30% larger than the inner shell. The owl-like appearance of the nebula is the result of an inner shell that is not circularly symmetric, but instead forms a barrel-like structure aligned at an angle of 45° to the line of sight.

The nebula holds about 0.13 solar masses of matter, including hydrogen, helium, nitrogen, oxygen, and sulfur; all with a density of less than 100 particles per cubic centimeter. Its outer radius is around 0.91 ly and it is expanding with velocities in the range of 27–39 km/s into the surrounding interstellar medium.

The 14th magnitude central star has since reached the turning point of its evolution where it condenses to form a white dwarf. It has 55–60% of the Sun's mass, 41–148 times the brightness of the Sun, and an effective temperature of 123,000 K.

Messier 108 (also known as NGC 3556) is a barred spiral galaxy in the constellation Ursa Major.

This galaxy is an isolated member of the Ursa Major Cluster of galaxies in the Virgo supercluster. It has a morphological classification of type SBbc in the de Vaucouleurs system, which means it is a barred spiral galaxy with somewhat loosely wound arms. The maximum angular size of the galaxy in the optical band is 11′.1 × 4′.6, and it is inclined 75° to the line of sight.

This galaxy has an estimated mass of 125 billion times the mass of the Sun and includes about 290 ± 80 globular clusters. Examination of the distribution of neutral hydrogen in this galaxy shows shells of expanding gas extending for several kiloparsecs, known as H1 supershells. These may be driven by bursts of star formation activity, resulting in supernovae explosions. Alternatively they may result from an infall of gas from outside the galaxy or by radio jets.
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License: Attribution Creative Commons

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M97 & M108 HaO3LRGB,