Sadr

The object was found in the following catalogues:
  1. The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

  2. SKY2000 - Master Star Catalog

  3. Smithsonian Astrophysical Observatory Star Catalog

  4. The Washington Visual Double Star Catalog, 1996.0

  5. Combined General Catalogue of Variable Stars (suspected variables)

catalogues and names Sadr, g Cyg, NSV 13048, 37 Cyg, HR 7796, HD 194093, SAO 49528, FK5: 765, WDS 20222+4015A
other names Sador, Sadir
constellation Cygnus

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)

note (category: star names): Sadr; Sador; Sadir.

object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

position, motion, parallax:

position (J2000) RA: 20h 22min 13,7sec DEC: +40° 15' 24''
position (J1900) RA: 20h 18min 38,3sec DEC: +39° 56' 11''
proper motion (J2000) RA: 0,004 arcsec/a DEC: 0 arcsec/a
radial velocity -8 km/s
note: variable radial velocity
rotational velocity 20 km/s (uncertain) (variable)
trigonometric parallax 0,003 arcsec

magnitude

visual magnitude 2,2
(V on UBV Johnson system)

spectral / color information

spectral class F8Ib
B-V-magnitude 0,68
U-B-magnitude 0,53
R-I-magnitude 0,34
note (category: spectra): Also classified F0Ia.

variability information

variable star identification 13048

double/multiple star system information

number of components of multiple star system 4
separation 141,2 arcsec
mag difference (of double or brightest multiple) 8,5
component ID AxBC

miscellaneous information

note (category: group membership): NGC 6910.
note (category: miscellaneous): No physical relation between the radio components and the star. No demonstrable connection between Gamma Cyg and the so-called Gamma Cygni supernova remnant.

data from SKY2000 - Master Star Catalog (Myers+ 1997)

position, motion, parallax:

position (J2000) RA: 20h 22min 13,704sec DEC: +40° 15' 24,14'' ±0,06 arcsec source: 15
proper motion (J2000) RA: 0,0003 arcsec/a DEC: 0 arcsec/a source: 25
radial velocity -8 km/s source: 25
trigonometric parallax 0,003 - source: 25
galactic coord. (B1950) longitude: 78,15° latitude: 1,87°
GCI unit vector (J2000) X: 0,443786 Y: -0,620856 Z: 0,646213

magnitude:

visual 2,2 (observed) source: 25
photovisual 2,3 source: 2

spectral information:

spectral class F8 source: 96
Morgan-Keenan F8Ib source: 25
B-magnitude 2,88 ±0,05 B-V-magnitude 0,68
U-magnitude 3,41 ±0,05 U-B-magnitude 0,53

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 141,2 arcsec
position angle 196 °

sources:

2 HD and HDE Catalogs
Cannon, A.J., and E.C. Pickering, Harvard Annals, Vols 91-99, 1918-24, Cambridge, Massachusetts: Harvard University; Cannon, A.J., Harvard Annals, Vol. 100, 1925-36, Cambridge, Massachusetts: Harvard University; and Cannon, A.J., and M. Walton Mayall, Harvard Annals, Vol. 112, 1949, Cambridge, Massachusetts: Harvard University
15 FK5, FK5 Extension and FK5 Supplement
Fricke, W., H. Schwan and T. Lederle, "Fifth Fundamental Catalogue (FK5), Part I. The Basic Fundamental Stars," Veroff. Astronomisches Recheninstitut, No. 32, Heidelberg, Germany, 1988, and Fricke, W., H. Schwan, and T.E. Corbin, "Fifth Fundamental Catalogue (FK5), Part II. The FK5 Extension," Veröff. Astronomisches Recheninstitut, No. 33, Heidelberg, Germany, 1991
19 WDS Catalog
Worley, C.E., and G.G. Douglass, Washington Catalog of Visual Double Stars 1996.0, United States Naval Observatory, 1996
25 Bright Star Catalogue, 5th edition
Hoffleit, D. and Warren, W.H. Jr., The Bright Star Catalogue, 5th Revised Edition, Version 2, 1994
96 SAO or HD/HDE Catalog
Reference from Value 1 or Reference from Value 2

data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)

position and proper motion:

position (J1950) RA: 20h 20min 25,927sec DEC: +40° 5' 44,58'' ±0,004 arcsec
position (J2000) RA: 20h 22min 13,71sec DEC: +40° 15' 24,12''
proper motion J1950 (FK4) RA: 0,0001 arcsec/a DEC: 0,002 arcsec/a ±0,001 arcsec/a in RA
±0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0004 arcsec/a DEC: 0 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 2,3 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class F8p
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue FK4, catalogue number: 765
Durchmusterung BD+39 4159
Boss General Catalogue 28338
Henry Draper Catalogue 194093

data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)

position and proper motion:

position (J2000) RA: 20h 22,2min DEC: +40° 15'
proper motion (J2000) RA: 0,004 arcsec/a DEC: 0 arcsec/a

double/multiple star system information:

component year number of measures position angle angular separation magnitude of 1st component magnitude of 2nd component spectral class(es) discoverer code
A-BC 1878 8 196° 141,2'' 2,2 - F8Ib BU 665
BC 1878 7 302° 1,8'' 10 11 - BU 665
BC-D 1911 1 134° 40,9'' - 12,8 - BU 665

discoverer information:

discoverer code discoverer reference
BU 665 Burnham, S.W. -

notes:

note Gamma Cyg.

data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)

position:

position (J1950) RA: 20h 20min 25,9sec DEC: +40° 5' 45''

variability informations:

magnitute at max. brightness 2,15
magnitute at min. brightness 2,26
photometric system visual, photovisual or Johnson's V

spectral information

spectral class F8

references

to a study 182320D (designation: GAMMA CYG)

miscanellous

There are notes in the published catalog (Kukarkin et al.(1982)).