Celestial hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  34 P Cyg  ·  37 gam Cyg  ·  40 Cyg  ·  B344  ·  B347  ·  Cygnus  ·  M 29  ·  NGC 6910  ·  NGC 6914  ·  PK076+01.1  ·  PK076+01.2  ·  PK077+02.1  ·  PK077+03.2  ·  PK078+00.1  ·  PK079+00.1  ·  Sadr  ·  Sh2-108  ·  The star 34Cyg  ·  The star 40Cyg  ·  The star Sadr (γCyg)  ·  VdB130  ·  VdB131  ·  VdB132
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Sadr region - the Butterfly included, urmymuse
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Sadr region - the Butterfly included

Getting plate-solving status, please wait...
Sadr region - the Butterfly included, urmymuse
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Sadr region - the Butterfly included

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Description

Another glorious clear night in Leeds, although full moon

Went duo narrow band using the Redcat51

3 hours 25 minutes on the Sadr region, including the butterfly nebula which I have done before with my Orion Astrograph

Wiki tells us ....

Gamma Cygni (γ Cygni, abbreviated Gamma Cyg, γ Cyg), officially named Sadr /ˈsædər/,[10][11] is a star in the northern constellation of Cygnus, forming the intersection of an asterism of five stars called the Northern Cross. Based upon parallax measurements obtained during the Hipparcos mission, it is approximately 1,800 light-years (560 parsecs) from the Sun.[1]

It forms the primary or 'A' component of a multiple star system designated WDS J20222+4015 (the secondary or 'BC' component is CCDM J20222+4015BC, a close pair of stars 40" away from γ Cygni[12]).

With an apparent visual magnitude of 2.23,[2] Gamma Cygni is among the brighter stars visible in the night sky. The stellar classification of this star is F8 Iab, indicating that it has reached the supergiant stage of its stellar evolution. Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified.[18]

Compared to the Sun this is an enormous star, with 12 times the Sun's mass and about 150 times the Sun's radius.[7] It is emitting over 33,000 times as much energy as the Sun, at an effective temperature of 6,100 K in its outer envelope.[7] This temperature is what gives the star the characteristic yellow-white hue of an F-type star. Massive stars such as this consume their nuclear fuel much more rapidly than the Sun, so the estimated age of this star is only about 12 million years old[8]

The spectrum of this star shows some unusual dynamic features, including variations in radial velocity of up to 2 km/s, occurring on a time scale of 100 days or more. Indeed, on the Hertzsprung–Russell diagram, Gamma Cygni lies close to the instability strip and its spectrum is markedly like that of a Cepheid variable.[3] This star is surrounded by a diffuse nebula called IC 1318, or the Gamma Cygni region.

Comments

Revisions

  • Sadr region - the Butterfly included, urmymuse
    Original
  • Sadr region - the Butterfly included, urmymuse
    B
  • Sadr region - the Butterfly included, urmymuse
    C
  • Final
    Sadr region - the Butterfly included, urmymuse
    D

B

Description: Brightened slightly, bit of additional contrast , reduced Sadr slightly

Uploaded: ...

C

Description: Having reviewed prior to trying to do a bit of a mosaic with my wide field crescent nebula I have brought more of the nebulosity out and brightened further

Uploaded: ...

D

Description: And this time the darker/dimmer reds

Uploaded: ...

Sky plot

Sky plot

Histogram

Sadr region - the Butterfly included, urmymuse