d Cygni


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 d Cyg, NSV 12381, 18 Cyg, HR 7528, HD 186882, SAO 48796, WDS 19450+4508A
constellation Cygnus

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


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

position, motion, parallax:

position (J2000) RA: 19h 44min 58,5sec DEC: +45 7' 51''
position (J1900) RA: 19h 41min 50,9sec DEC: +44 53' 12''
proper motion (J2000) RA: 0,053 arcsec/a DEC: 0,047 arcsec/a
radial velocity -20 km/s
note: spectroscopic binaries
rotational velocity 149 km/s (uncertain) (variable)
trigonometric parallax 0,03 arcsec
note (category: dynamical parallaxes): 0.021".

magnitude

visual magnitude 2,87
(V on UBV Johnson system)

spectral / color information

spectral class B9.5IV+F1V
B-V-magnitude -0,03
U-B-magnitude -0,1
R-I-magnitude -0,02
note (category: colors): Color excess E(B-V) = +0.05.

variability information

variable star identification 12380/1
note (category: variability): ADS 12880A is NSV 12381, 2.85 - 2.89V. Component B is NSV 12380, 6.5 ->8.5v.

double/multiple star system information

number of components of multiple star system 3
separation 2 arcsec
mag difference (of double or brightest multiple) 3,5
component ID AB
note (category: double and multiple data): AB 2.91 B9.5III, 6.33 F1V, 827.6y, a = 3.20".

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

position, motion, parallax:

position (J2000) RA: 19h 44min 58,588sec DEC: +45 7' 50,46'' 0,43 arcsec source: 16
proper motion (J2000) RA: 0,0054 arcsec/a DEC: 0,039 arcsec/a source: 25
radial velocity -20 km/s source: 25
trigonometric parallax 0,03 0,003 arcsec source: 25
galactic coord. (B1950) longitude: 78,71 latitude: 10,24
GCI unit vector (J2000) X: 0,311966 Y: -0,632769 Z: 0,708718

magnitude:

visual 2,87 (observed) source: 25
photovisual 3 source: 2
photographic 3 source: 16

spectral information:

spectral class A0 source: 96
Morgan-Keenan B9.5IV+F1V source: 25
B-magnitude 2,84 0,05 B-V-magnitude -0,03
U-magnitude 2,74 0,05 U-B-magnitude -0,1

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 2,5 arcsec
magnitude difference between brightest and second brightest component 5
position angle 229

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
16 PPM North and PPM South Catalogs and PPM Supplement
Roser, S., and U. Bastian, "Catalogue of Positions and Proper Motions," A&AS, Vol. 74, p. 449, 1988, and Bastian, U., et al., "Catalogue of Positions and Proper Motions - South," 1993
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: 19h 43min 24,671sec DEC: +45 0' 28,23'' 0,007 arcsec
position (J2000) RA: 19h 44min 58,535sec DEC: +45 7' 50,66''
proper motion J1950 (FK4) RA: 0,0046 arcsec/a DEC: 0,049 arcsec/a 0,001 arcsec/a in RA
0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,005 arcsec/a DEC: 0,048 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

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

spectral information:

spectral class A0
source of spectral data Taken from the HD with M stars reclassified by Miss Cannon.

catalogues

source catalogue FK3, catalogue number: 742
Durchmusterung BD+44 3234
Boss General Catalogue 27347
Henry Draper Catalogue 186882

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

position and proper motion:

position (J2000) RA: 19h 45min DEC: +45 8'
proper motion (J2000) RA: 0,051 arcsec/a DEC: 0,05 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
AB 1826 often 41 1,8'' 2,87 7,9 B9.5IV STF2579
1990 229 2,5''
AC 1913 2 66 68,2'' 3 12 - STF2579
1960 - 65,7''

discoverer information:

discoverer code discoverer reference
STF2579 Struve, F.G.W. -

notes:

note Delta Cyg. P = 780yr., a = 3.00", motion retrograde.

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

position:

position (J1950) RA: 19h 43min 24,7sec DEC: +45 0' 28''

variability informations:

magnitute at max. brightness 2,85
magnitute at min. brightness 2,89
photometric system visual, photovisual or Johnson's V

spectral information

spectral class A0

references

to a study 511703D (designation: DELTA CYG)

miscanellous

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