V1488 Cygni

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

note (category: star names):

Originally called Omicron2 Cyg in GCVS, the name has been changed to V1488 Cyg because of much confusion as to which star is Omicron1, which Omicron2. See HR 7730.

position, motion, parallax:

position (J2000)	RA: 20h 15min 28.3sec	DEC: +47° 42' 52''
position (2000.73)	RA: 20h 15min 29sec	DEC: +47° 43' 0''
position (B1900)	RA: 20h 12min 22.8sec	DEC: +47° 24' 25''
proper motion (J2000)	RA: 0.001 arcsec/a	DEC: 0.008 arcsec/a
radial velocity	-14 km/s note: spectroscopic binaries note: orbital data avaible
rotational velocity	<25 km/s (uncertain) (variable)
trigonometric parallax	0.014 arcsec
galactic coordinates	longitude: 83.67°	latitude: 7.05°

magnitude

visual magnitude

3.98
(V on UBV Johnson system)

spectral / color information

spectral class	K3Ib+B3V
B-V-magnitude	1.52
U-B-magnitude	1.03
R-I-magnitude
IR-note	object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

note (category: spectra):

Also classified K5Iab + B4IV-V and K3II + B9:V.

variability information

variable star identification

V1488 Cyg

note (category: variability):

EA 3.90 - 4.14V, 1147.4d. Period varies. Light var. outside eclipse. The K component may be slightly intrinsically variable.

double/multiple star system information

separation	208.9 arcsec
mag difference (of double or brightest multiple)	5.5
note	Worley (1978) update of the IDS

note (category: spectroscopic binaries):

1147.8d, K 17.0k/s, V0 -5.7k/s, msin3i 9.15, asini 256. Also 390d suspected. Unresolved by speckle interferometry. SKYLAB indicates cool star with hot companion.

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

position, motion, parallax:

position (J2000)	RA: 20h 15min 28.329sec	DEC: +47° 42' 51.13''	ą0.35 arcsec	source: 17
position (2000.73)	RA: 20h 15min 29sec	DEC: +47° 42' 59''	JD: 2451810.11
proper motion (J2000)	RA: 0.0006 arcsec/a	DEC: 0.003 arcsec/a		source: 25
radial velocity	-14 km/s			source: 25
trigonometric parallax	0.014 arcsec		ą0.001 arcsec	source: 25
galactic coord. (B1950)	longitude: 83.67°	latitude: 7.05°

magnitude:

visual	3.98 (observed)	source: 25
photovisual	4.2	source: 2
photographic	5.2	source: 16

spectral information:

spectral class	K0		source: 96
Morgan-Keenan	K4-5Ib+B6-7V		source: 25
B-magnitude	5.5 ą0.05	B-V-magnitude	1.52
U-magnitude	6.53 ą0.05	U-B-magnitude	1.03

variability information:

source of data: 27

variability type	310
var. amplitude	0.2
var. period	1147.4
var. epoch	2441256.96 1. November 1971, 11:02:24 UT
next max light	2452730.96 1. April 2003, 11:02:24 UT

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	208.9 arcsec
magnitude difference between brightest and second brightest component	5.7
position angle	175 °

component	magnitude	spectral class	catalogue(s)/name(s)
A	3.9	+++
B	3.98	K0	32 Cyg, HR 7751, HD 192909, SAO 49385

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
17	ACRS
Corbin, T.E., and S.E. Urban, Astrographic Catalog Reference Stars, United States Naval Observatory, 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
27	Catalog of Red Magnitudes (CRM)
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: 20h 13min 55.487sec	DEC: +47° 33' 35.69''	ą0.022 arcsec
position (2000.73)	RA: 20h 15min 29sec	DEC: +47° 43' 0''	JD: 2451810.11
position (J2000)	RA: 20h 15min 28.306sec	DEC: +47° 42' 51.71''
proper motion B1950 (FK4)	RA: -0.0003 arcsec/a	DEC: 0.01 arcsec/a	ą0.004 arcsec/a in RA ą0.002 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0001 arcsec/a	DEC: 0.008 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	4.2 (accuracy: 2 decimals)
source of visual magnitude data	Taken from Harvard or San Luis photometry.

spectral information:

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

catalogues

source catalogue	GC, catalogue number: 28160
Durchmusterung	BD+47 3059
Boss General Catalogue	28160
Henry Draper Catalogue	192909 The "SAO Catalog" entry refers to two consecutive HD numbers, the lower of which is given.

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

position and proper motion:

position (J2000)	RA: 20h 15.5min	DEC: +47° 43'
proper motion (J2000)	RA: 0.006 arcsec/a	DEC: 0.003 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
-	1824	3	175°	208.9''	3.98	9.7	K3Ib+B3V	S 743

discoverer information:

discoverer code	discoverer	reference
S 743	South, J.	-

notes:

note	32 Cyg. A spectroscopic and eclipsing binary, V1488 Cyg. B is BD+47@3060. Proper motion of B -004 -001.

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

position:

position (equinox 1950.0)

RA: 20h 13min 55.5sec

DEC: +47° 33' 36''

variability informations:

variability type	EA/GS/D	close binary eclipsing system
magnitute at max. brightness	3.9
magnitute at min. brightness	4.14
photometric system	visual, photovisual or Johnson's V
epoch for maximum light [JD]	2441256.96 1. November 1971, 11:02:24 UT
period [d]	1147.4
next maximum light [JD]	2452730.96 1. April 2003, 11:02:24 UT
duration of the eclipse	015 % of period

spectral information

spectral class

K5Iab+B4IV-V

references

to a study	Vol. I GCVS (see Kholopov et al. 1985-1988)
to a chart/photograph	no chart is avaible, but the star is contained in the 'Bonner Durchmusterung'

miscanellous

ID in the GCVS catalogue	31/1488
constellation	Cygnus
notes on existence	The star is equivalent to '0311489 V1489'.
There are notes in published catalog.

variability type description

variability type	description
EA	Eclipsing binary systems. These are binary systems with orbital planes so close to the observer's line of sight (the inclination i of the orbital plane to the plane orthogonal to the line of sight is close to 90 deg) that the components periodically eclipse each other. Consequently, the observer finds changes of the apparent combined brightness of the system with the period coincident with that of the components' orbital motion. EA Algol (Beta Persei)-type eclipsing systems. Binaries with spherical or slightly ellipsoidal components. It is possible to specify, for their light curves, the moments of the beginning and end of the eclipses. Between eclipses the light remains almost constant or varies insignificantly because of reflection effects, slight ellipsoidality of components, or physical variations. Secondary minima may be absent. An extremely wide range of periods is observed, from 0.2 to >= 10000 days. Light amplitudes are also quite different and may reach several magnitudes. EB Beta Lyrae-type eclipsing systems. These are eclipsing systems having ellipsoidal components and light curves for which it is impossible to specify the exact times of onset and end of eclipses because of a continuous change of a system's apparent combined brightness between eclipses; secondary minimum is observed in all cases, its depth usually being considerably smaller than that of the primary minimum; periods are mainly longer than 1 day. The components generally belong to early spectral types (B-A). Light amplitudes are usually <2 mag in V. EW W Ursae Majoris-type eclipsing variables. These are eclipsers with periods shorter than 1 days, consisting of ellipsoidal components almost in contact and having light curves for which it is impossible to specify the exact times of onset and end of eclipses. The depths of the primary and secondary minima are almost equal or differ insignificantly. Light amplitudes are usually <0.8 mag in V. The components generally belong to spectral types F-G and later.
GS	Systems with one or both giant and supergiant components; one of the components may be a main sequence star.
D	Detached systems, with components not filling their inner Roche lobes.

catalogues and names	V1488 Cyg, 32 Cyg, HR 7751, HD 192909, SAO 49385, BD +47 3059, WDS 20155+4743A
constellation	Cygnus