Gamma Cygni Nebulosity (hargb)

Η φωτογραφία μου από την 6η Πανελλήνια εξόρμηση ερασιτεχνών αστρονόμων στον Πάρνωνα Κάπου ανάμεσα στον χαβαλέ, την ανταλλαγή απόψεων, την παρατήρηση και τις βόλτες στο αστροχωριό είπα να πάρω και κανένα fit to σπίτι...Αφιερωμένη στους παλιούς και καινούργιους φίλους που παρευρέθησαν στην εξόρμηση Με το καλό και του χρόνου παιδιά!

Gamma Cygni (γ Cyg, γ Cygni) is the Bayer designation for a star in the northern constellation Cygnus, forming the intersection of an asterism of five stars called the Northern Cross. It has the traditional name Sadr.With an apparent visual magnitude of 2.23, this is among the brighter stars visible in the night sky. Parallax measurements give a distance estimate of 1,800 light years (560 parsecs), with a 15% margin of error. 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.The spectrum of this star shows some unusual dynamic features, including variations in radial velocity of up to 2 km sec–1, 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 IC1318, or the Gamma Cygni region.

Object: Gamma Cygni Nebulosity (HaRGB)

Type: Diffuse

Constellation: Cygnus

Distance: 1.800 Light Years

Location: Mount Parnonas - Greece

Date: 20-21 July 2012

Scope: Officina Stellare Hyper APO 80 @ f4.8

FF/FR: Televue 0.8x Photo Reducer/Flattener

Camera: QHY9 KAF8300 Mono

Chip Temp:-20 C

Filters: Astronomik Ha-R-G-B

Mount: Skywatcher NEQ6 PRO + EQMOD

Quiding: QHY5 + Baader UV/IR Cut + PHD

Capture: Nebulocity 3

Light Frames:

Ha: 12x600sec Bin1x1

RGB: 12x300sec Bin2x2

Total: 5h

Calibration Frames:

20x[Darks,Flats,Dark Flats,Bias] per channel