SH 2 - 124 SHO (Valerio Avitabile)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: 80 Cyg) · Azelfage (π1 Cyg · The star Azelfafage

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SH 2 - 124 SHO

Link: https://valerioavitabile-astrophotography.it/astrofotografie

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SH 2 - 124 SHO

Link: https://valerioavitabile-astrophotography.it/astrofotografie

Sh2-124 is a large emission nebula visible in the constellation Cygnus
in the north-west, along the Milky Way, east of the star pair ρ1 Cygni and ρ2 Cygni; the best period for its observation in the evening sky falls between July and December .
Sh2-124 is an extended nebular system, linked to the infrared source RAFGL 2789, which is identified with its stellar counterpart known as V645 Cygni, probably an O-class star or a Herbig Ae/Be star. The complex is probably located within Orion's Arm at a distance of about 2600 parsecs (about 8480 light years) although these data are discordant due to different estimates. If the distance of 2600 parsecs is correct, this nebula could be located in an inter-arm region or close to the inner edge of the Perseus Arm, in the foreground of the Cepheus OB1 association.

The main stars responsible for the ionisation of the nebula's gas would be a blue star of spectral class O7V and a blue star of spectral class B2V, to which others could possibly be added. The nebula hosts star formation processes, and a number of infrared sources have been detected within it, five of which were identified by the IRAS satellite. Two masers were also detected, one with H2O emissions centred on the V645 Cygni component and one with CH3OH emissions.

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Astrometry.net job	9253540
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