Y Aquilae

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

position, motion, parallax:

position (J2000)	RA: 19h 6min 58.6sec	DEC: +11° 4' 17''
position (B1900)	RA: 19h 2min 16.1sec	DEC: +10° 55' 2''
proper motion (J2000)	RA: 0.005 arcsec/a	DEC: -0.026 arcsec/a
radial velocity	-19 km/s note: spectroscopic binaries note: orbital data avaible
rotational velocity	57 km/s (uncertain) (variable)
trigonometric parallax	0.016 arcsec
galactic coordinates	longitude: 44.55°	latitude: 1.63°

magnitude

visual magnitude

5.09
(V on UBV Johnson system)

spectral / color information

spectral class	B8III
B-V-magnitude	-0.07
U-B-magnitude	-0.39

variability information

variable star identification

Y Aql

note (category: variability):

E 5.02 - 5.06B, 1.30227d. Form of light curve possibly variable.

double/multiple star system information

note (category: spectroscopic binaries):

1.3023d, K 27.6k/s, V0 -18.7k/s, asini 0.494.

miscellaneous information

note (category: group membership):

Possible Pleiades group.

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

position, motion, parallax:

position (J2000)	RA: 19h 6min 58.609sec	DEC: +11° 4' 16.58''	±0.22 arcsec	source: 15
proper motion (J2000)	RA: 0.0003 arcsec/a	DEC: -0.026 arcsec/a		source: 25
radial velocity	-19 km/s			source: 25
trigonometric parallax	0.016 arcsec		±0.002 arcsec	source: 25
galactic coord. (B1950)	longitude: 44.55°	latitude: 1.63°

magnitude:

visual	5.09 (observed)	source: 25
photovisual	5.1	source: 2

spectral information:

spectral class	B8		source: 96
Morgan-Keenan	B8III		source: 25
B-magnitude	5.02 ±0.05	B-V-magnitude	-0.07
U-magnitude	4.63 ±0.05	U-B-magnitude	-0.39

variability information:

source of data: 30

variability type	10
var. amplitude	0.04
var. period	1.3
var. epoch	2438607 30. July 1964, 12:00:00 UT
next max light	2452219.3 5. November 2001, 19:12:00 UT

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	0.3 arcsec
magnitude difference between brightest and second brightest component	1.3
position angle	304 °

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
30	GCVS, 4th edition
Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88
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: 19h 4min 37.312sec	DEC: +10° 59' 34.3''	±0.015 arcsec
position (J2000)	RA: 19h 6min 58.598sec	DEC: +11° 4' 16.64''
proper motion B1950 (FK4)	RA: -0.0002 arcsec/a	DEC: -0.028 arcsec/a	±0.003 arcsec/a in RA ±0.003 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0 arcsec/a	DEC: -0.029 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	5.1 (accuracy: 2 decimals)
source of visual magnitude data	Taken from Harvard or San Luis photometry.

spectral information:

spectral class	B8
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	GC, catalogue number: 26315
Durchmusterung	BD+10 3787
Boss General Catalogue	26315
Henry Draper Catalogue	178125

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

position:

position (equinox 1950.0)

RA: 19h 4min 37.3sec

DEC: +10° 59' 34''

variability informations:

variability type	E/KE	close binary eclipsing system
magnitute at max. brightness	5.02
magnitute amplitude	0.04
photometric system
epoch for maximum light [JD]	2438607.445 30. July 1964, 22:40:48 UT
period [d]	1.30227
next maximum light [JD]	2452220.07331 6. November 2001, 13:45:34 UT

spectral information

spectral class

B8III-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	5/8
constellation	Aquila
notes on existence	The star is equivalent to '0050009 Z'.
There are notes in published catalog.

variability type description

variability type	description
E	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.
KE	Contact systems of early (O-A) spectral type, both components being close in size to their inner critical surfaces.

catalogues and names	Y Aql, 18 Aql, HR 7248, HD 178125, SAO 104488, BD +10 3787, FK5: 3525
constellation	Aquila