V0389 Cygni

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

position, motion, parallax:

position (J2000)	RA: 21h 8min 38.9sec	DEC: +30° 12' 21''
position (B1900)	RA: 21h 4min 24.3sec	DEC: +29° 48' 5''
proper motion (J2000)	RA: 0.025 arcsec/a	DEC: -0.017 arcsec/a
radial velocity	-26 km/s note: spectroscopic binaries note: orbital data avaible
rotational velocity	10 km/s (uncertain) (variable)
trigonometric parallax	-0.006 arcsec
galactic coordinates	longitude: 76.11°	latitude: -11.77°

note (category: dynamical parallaxes):

0.008".

magnitude

visual magnitude

5.59
(V on UBV Johnson system)

spectral / color information

spectral class	B9VpSi
B-V-magnitude	-0.1
U-B-magnitude	-0.26

variability information

variable star identification

V389 Cyg

note (category: variability):

ADS 14682A, 5.55 - 5.71V. Alternating periods of 1.12912 and 1.19328d. V 389 Cyg may be triple star, with long period about 150d, perhaps 110 or 270d.

double/multiple star system information

number of components of multiple star system	4
separation	3.4 arcsec
mag difference (of double or brightest multiple)	2.3
component ID	AB

note (category: double and multiple data):

AB binary. B, 7.8v A0V or Am(A2.5/A7V/A9), vsini 80k/s. C, 9.2v K1III at 58" optical, vsini =<54k/s.

note (category: spectroscopic binaries):

ADS 14682A, 3.3132d, K 20.2k/s, V0 -22.1k/s, asini 0.920. Also about 150d, possibly 110 or 270d.

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

position, motion, parallax:

position (J2000)	RA: 21h 8min 38.883sec	DEC: +30° 12' 20.59''	ą1.24 arcsec	source: 29
proper motion (J2000)	RA: 0.0019 arcsec/a	DEC: -0.017 arcsec/a		source: 25
radial velocity	-26 km/s			source: 25
galactic coord. (B1950)	longitude: 76.11°	latitude: -11.77°

magnitude:

visual	5.5 (observed)	source: 31
photovisual	5.6	source: 2
photographic	5.6	source: 2

spectral information:

spectral class	A0		source: 96
Morgan-Keenan	B9VpSi		source: 25
B-magnitude	5.49 ą0.05	B-V-magnitude	-0.1
U-magnitude	5.23 ą0.05	U-B-magnitude	-0.26

variability information:

source of data: 30

variability type	10
var. amplitude	0.16

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	3.5 arcsec
magnitude difference between brightest and second brightest component	2
position angle	301 °

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
30	GCVS, 4th edition
Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88
31	CRM' (non-GCVS variable data)
Warren, W.H. Jr., Northern Hemisphere Catalog of Red Magnitudes, 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 (B1950)	RA: 21h 6min 31.476sec	DEC: +30° 0' 9.79''	ą0.027 arcsec
position (J2000)	RA: 21h 8min 38.883sec	DEC: +30° 12' 20.59''
proper motion B1950 (FK4)	RA: 0.0018 arcsec/a	DEC: -0.014 arcsec/a	ą0.005 arcsec/a in RA ą0.003 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0019 arcsec/a	DEC: -0.017 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	5.7 (accuracy: 1 decimal)
source of visual magnitude data	Based on Durchmusterung magnitudes and visual estimates

spectral information:

spectral class	A0
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: 29562
Durchmusterung	BD+29 4324
Boss General Catalogue	29562
Henry Draper Catalogue	201433

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

position and proper motion:

position (J2000)	RA: 21h 8.6min	DEC: +30° 12'
proper motion (J2000)	RA: 0.021 arcsec/a	DEC: -0.017 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	1829	68	316°	3.5''	5.8	7.8	B9V	STF2762
AB	1994	68	301°	-	5.8	7.8	B9V	STF2762
AC	1865	7	225°	57.7''	5.7	8.9	-	STF2762
AC	1959	7	227°	58.8''	5.7	8.9	-	STF2762
AD	1915	2	67°	73.9''	5.6	10	-	STF2762

discoverer information:

discoverer code	discoverer	reference
STF2762	Struve, F.G.W.	-

notes:

note	A is probably an Alpha CVn-type variable, V389 Cyg. There also may be a long-period spectroscopic binary in the system.

data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)

position:

position (equinox 1950.0)

RA: 21h 6min 31.5sec

DEC: +30° 0' 10''

variability informations:

variability type	*
magnitute at max. brightness	5.55
magnitute at min. brightness	5.71
photometric system	visual, photovisual or Johnson's V

spectral information

spectral class

B9Vp(Si)

references

to a study	Vol. I GCVS (see Kholopov et al. 1985-1988)
to a chart/photograph	Vol. I GCVS (see Kholopov et al. 1985-1988)

miscanellous

ID in the GCVS catalogue	31/389
constellation	Cygnus
notes on existence	The star is equivalent to '0310390 V0390'.
There are notes in published catalog.