catalogues and names

The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

SKY2000 - Master Star Catalog

Smithsonian Astrophysical Observatory Star Catalog

The Washington Visual Double Star Catalog, 1996.0

Combined General Catalogue of Variable Stars (Vol. I-III)

catalogues and names

catalogues and names	V1288 Aql, 21 Aql, HR 7287, HD 179761, SAO 124408, BD +2 3824, FK5: 3537, WDS 19137+0218
constellation	Aquila

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

position, motion, parallax:

position (J2000)	RA: 19h 13min 42.7sec	DEC: +2° 17' 37''
position (B1900)	RA: 19h 8min 40.1sec	DEC: +2° 7' 25''
proper motion (J2000)	RA: 0.009 arcsec/a	DEC: -0.003 arcsec/a
radial velocity	-5 km/s note: variable radial velocity
rotational velocity	19 km/s (uncertain) (variable)
trigonometric parallax	0.009 arcsec
galactic coordinates	longitude: 37.52°	latitude: -3.9°

magnitude

visual magnitude

5.15 (V on UBV Johnson system)

spectral / color information

spectral class	B8II-III
B-V-magnitude	-0.07
U-B-magnitude	-0.41

variability information

variable star identification

V1288 Aql

note (category: variability):

Alpha CV 5.06 - 5.16V, 1.73d.

double/multiple star system information

separation	36.2 arcsec
mag difference (of double or brightest multiple)	7.5

note (category: double and multiple data):

Companion optical.

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

position, motion, parallax:

position (J2000)	RA: 19h 13min 42.707sec	DEC: +2° 17' 37.26''	±0.22 arcsec	source: 15
proper motion (J2000)	RA: 0.0006 arcsec/a	DEC: -0.003 arcsec/a		source: 25
radial velocity	-5 km/s			source: 25
trigonometric parallax	0.009 arcsec		±0.001 arcsec	source: 25
galactic coord. (B1950)	longitude: 37.53°	latitude: -3.9°

magnitude:

visual	5.1 (observed)	source: 31
photovisual	5.1	source: 2

spectral information:

spectral class	B8		source: 96
Morgan-Keenan	B8II-III		source: 25
B-magnitude	5.08 ±0.05	B-V-magnitude	-0.07
U-magnitude	4.67 ±0.05	U-B-magnitude	-0.41

variability information:

source of data: 30

variability type	160
var. amplitude	0.1
var. period	1.73
var. epoch	2444099 13. August 1979, 12:00:00 UT
next max light	2452219.62 6. November 2001, 02:52:48 UT

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	36.2 arcsec
magnitude difference between brightest and second brightest component	7.2
position angle	287 °

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
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: 19h 11min 11.383sec	DEC: +2° 12' 25.96''	±0.012 arcsec
position (J2000)	RA: 19h 13min 42.706sec	DEC: +2° 17' 37.63''
proper motion B1950 (FK4)	RA: 0.0005 arcsec/a	DEC: 0.003 arcsec/a	±0.002 arcsec/a in RA ±0.002 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0007 arcsec/a	DEC: 0.002 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.

remarks for duplicity and variability

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

catalogues

source catalogue	GC, catalogue number: 26490
Durchmusterung	BD+02 3824
Boss General Catalogue	26490
Henry Draper Catalogue	179761

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

position and proper motion:

position (J2000)	RA: 19h 13.7min	DEC: +2° 18'
proper motion (J2000)	RA: 0.009 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
-	1878	3	287°	36.2''	5.15	12.3	B8II-III	HJ 879

discoverer information:

discoverer code	discoverer	reference
HJ 879	Herschel, J.	-

notes:

note	21 Aql. A is the Alpha CVn-type variable V1288 Aql. Spectrum of B: F8V.

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

position:

position (equinox 1950.0)

RA: 19h 11min 11.4sec

DEC: +2° 12' 26''

variability informations:

variability type	ACV	rotating variable star
magnitute at max. brightness	5.06
magnitute at min. brightness	5.16
photometric system	visual, photovisual or Johnson's V
epoch for maximum light [JD]	2444099.23 13. August 1979, 17:31:12 UT
period [d]	1.73
next maximum light [JD]	2452219.85 6. November 2001, 08:24:00 UT

spectral information

spectral class

B8II-IIIp(Hg:)

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	5/1288
constellation	Aquila
notes on existence	The star is equivalent to '0051289 V1289'.
There are notes in published catalog.

variability type description

variability type

description

ACV

Alpha2 Canum Venaticorum variables. These are main-sequence stars with spectral types B8p-A7p and displaying strong magnetic fields. Spectra show abnormally strong lines of Si, Sr, Cr, and rare earths whose intensities vary with rotation. They exhibit magnetic field and brightness changes (periods of 0.5-160 days or more). The amplitudes of the brightness changes are usually withine 0.01-0.1 mag in V. ACVO Rapidly oscillating Alpha2 CVn variables. These are nonradially pulsating, rotating magnetic variables of Ap spectral type (DO Eri). Pulsation periods are in the range of 6-12 mmag (0.004-0.01 days), while amplitudes of light variation caused by the pulsation are about 0.01 mag in V. The pulsational variations are superposed on those caused by rotation.