m1Cygni

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. 4th Catalog of Orbits of Visual Binaries

catalogues and names m1Cyg, NSV 25756, 78 Cyg, HR 8309, HD 206826, SAO 89940, WDS 21441+2845A
constellation Cygnus

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


position, motion, parallax:

position (J2000) RA: 21h 44min 8,6sec DEC: +28° 44' 34''
position (J1900) RA: 21h 39min 40,1sec DEC: +28° 17' 27''
proper motion (J2000) RA: 0,292 arcsec/a DEC: -0,241 arcsec/a
radial velocity 18 km/s
note: spectroscopic binaries, double lined spectra
rotational velocity 18 km/s (uncertain) (variable)
trigonometric parallax 0,049 arcsec
note (category: dynamical parallaxes): 0.052".

magnitude

visual magnitude 4,73
(original HR magnitude)

spectral / color information

spectral class F6V
B-V-magnitude 0,48
U-B-magnitude 0,01
R-I-magnitude 0,28

double/multiple star system information

number of components of multiple star system 5
separation 2 arcsec
mag difference (of double or brightest multiple) 1,3
component ID AB
note (category: double and multiple data): AB 4.78 F4V, 6.09 G2V, 507.5y, a = 4.278". B is HR 8310. Combined colors. Mag. for blend 4.50V. Components C, D, optical. D, at 201" is ADS 15275, 6.9 A5, 13.3v sep. 16".

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

position, motion, parallax:

position (J2000) RA: 21h 44min 8,606sec DEC: +28° 44' 34,31'' ±1,24 arcsec source: 29
proper motion (J2000) RA: 0,0222 arcsec/a DEC: -0,241 arcsec/a source: 25
radial velocity 18 km/s source: 25
trigonometric parallax 0,049 ±0,005 arcsec source: 25
galactic coord. (B1950) longitude: 80,59° latitude: -18,34°
GCI unit vector (J2000) X: 0,727196 Y: -0,489838 Z: 0,48088

magnitude:

visual 4,77 (observed) source: 25
photovisual 4,7 source: 2
photographic 5,2 source: 2

spectral information:

spectral class F5 source: 96
Morgan-Keenan F6V source: 25
B-magnitude 5,22 ±0,05 B-V-magnitude 0,45
U-magnitude 5,21 ±0,05 U-B-magnitude -0,01

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 2,1 arcsec
magnitude difference between brightest and second brightest component 1,4
position angle 305 °

component magnitude spectral class catalogue(s)/name(s)
A 4,77 F5 m1Cygni, 78 Cyg, HR 8309, HD 206826, SAO 89940
B 6,11 F5 m2Cygni, 78 Cyg, HR 8310, HD 206827, SAO 89939

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
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
29 SAOJ2000
SAO on FK5 at J2000, 1989
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: 21h 41min 54,246sec DEC: +28° 30' 58,01'' ±0,019 arcsec
position (J2000) RA: 21h 44min 8,606sec DEC: +28° 44' 34,31''
proper motion J1950 (FK4) RA: 0,022 arcsec/a DEC: -0,238 arcsec/a ±0,003 arcsec/a in RA
±0,002 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0222 arcsec/a DEC: -0,241 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 4,7 (accuracy: 2 decimals)
source of visual magnitude data Taken from Harvard or San Luis photometry.

spectral information:

spectral class F5
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

remarks for duplicity and variability

Double star in Aitken's Double Star Catalogue (Aitken 1932)

catalogues

source catalogue GC, catalogue number: 30438
Durchmusterung BD+28 4169A
Boss General Catalogue 30438
Henry Draper Catalogue 206826

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

position and proper motion:

position (J2000) RA: 21h 44,1min DEC: +28° 45'
proper motion (J2000) RA: 0,288 arcsec/a DEC: -0,241 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 1823 often 109° 5,6'' 4,7 6,1 F6V G2V STF2822
1994 305° 2,1''
AC 1878 11 263° 35,3'' 4,7 11,5 - STF2822
1987 289° 68,2''
AD 1823 24 61° 217,4'' 4,7 6,9 F7V F2V STF2822
1956 52° 199''
BD 1902 2 54° 206,1'' 6,1 6,9 A5 STF2822
1909 53° 204,7''

discoverer information:

discoverer code discoverer reference
STF2822 Struve, F.G.W. -

notes:

note Mu Cyg. P = 789yr., a = 5.32", motion direct. The A component is a double-lined spectroscopic binary. AB: H III 15. D is the principal component of ES 521.

data from 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)

position:

position (J1900) RA: 21h 39,7min DEC: +28° 17'

magnitudes, spectral classes, orbital elements:

author: W.D. Heintz
date of observation: 1965
magnitude of component A: 4,78
magnitude of component B: 4,78
spectral class component B: F7V
spectral class component B: F7V
period [y]: 507,5
semi-major axis [arcsec]: 4,278
inclination [deg]: 76,5
node [deg]: 109,6
equinox of node: 2000
eccentricity: 0,58
time of periastron passage: 1962,5
dates of ephemeris: 1965-1990
grade: preliminary
reference: Veroff. Sternw. Munchen 7, 26; 1966.
other name(s) STF 2822, Mu Cyg