V1291 Aquilae

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

position, motion, parallax:

position (J2000)	RA: 19h 53min 18.7sec	DEC: -3° 6' 52''
position (B1900)	RA: 19h 48min 4.5sec	DEC: -3° 22' 25''
proper motion (J2000)	RA: 0.024 arcsec/a	DEC: 0.015 arcsec/a
radial velocity	-20 km/s note: variable radial velocity
rotational velocity	2 km/s (uncertain) (variable)
trigonometric parallax	0.003 arcsec
galactic coordinates	longitude: 37.27°	latitude: -15.18°

magnitude

visual magnitude

5.65
(V on UBV Johnson system)

spectral / color information

spectral class	A5p
B-V-magnitude	0.2
U-B-magnitude	0.1

note (category: spectra):

Also classified F0p SrCrEu.

variability information

variable star identification

V1291 Aql

note (category: variability):

Alpha CV 5.61 - 5.67V, 224.5d. Also period for spectrum and magnetic field var. Rotation 226d.

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

position, motion, parallax:

position (J2000)	RA: 19h 53min 18.742sec	DEC: -3° 6' 52.08''	±0.06 arcsec	source: 15
proper motion (J2000)	RA: 0.0016 arcsec/a	DEC: 0.015 arcsec/a		source: 25
radial velocity	-20 km/s			source: 25
trigonometric parallax	0.003 arcsec		-	source: 25
galactic coord. (B1950)	longitude: 37.28°	latitude: -15.18°

magnitude:

visual	5.65 (observed)	source: 25
photovisual	5.6	source: 2
photographic	5.9	source: 2

spectral information:

spectral class	F0		source: 96
Morgan-Keenan	A5p		source: 25
B-magnitude	5.85 ±0.05	B-V-magnitude	0.2
U-magnitude	5.95 ±0.05	U-B-magnitude	0.1

variability information:

source of data: 27

variability type	160
var. amplitude	0.1
var. period	224.5
var. epoch	2432323 17. May 1947, 12:00:00 UT
next max light	2452303.5 29. January 2002, 00:00:00 UT

double/multiple star system information:

component	magnitude	spectral class	catalogue(s)/name(s)
A	5.65	F0	HR 7575, HD 188041, SAO 143883
B	5.61	+++

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
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: 19h 50min 41.602sec	DEC: -3° 14' 43.33''	±0.007 arcsec
position (J2000)	RA: 19h 53min 18.744sec	DEC: -3° 6' 52.01''
proper motion B1950 (FK4)	RA: 0.0014 arcsec/a	DEC: 0.017 arcsec/a	±0.002 arcsec/a in RA ±0.002 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0016 arcsec/a	DEC: 0.015 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	5.6 (accuracy: 2 decimals)
source of visual magnitude data	Taken from the "Henry Draper Catalogue".

spectral information:

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

catalogues

source catalogue	FK4, catalogue number: 1519
Durchmusterung	BD-03 4742
Boss General Catalogue	27532
Henry Draper Catalogue	188041 The "SAO Catalog" entry refers to two consecutive HD numbers, the lower of which is given.

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

position:

position (equinox 1950.0)

RA: 19h 50min 41.6sec

DEC: -3° 14' 43''

variability informations:

variability type	ACV	rotating variable star
magnitute at max. brightness	5.61
magnitute at min. brightness	5.67
photometric system	visual, photovisual or Johnson's V
epoch for maximum light [JD]	2432323 17. May 1947, 12:00:00 UT
period [d]	224.5
next maximum light [JD]	2452303.5 29. January 2002, 00:00:00 UT

spectral information

spectral class

A5p(Sr-Cr-Eu)

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	5/1291
constellation	Aquila
notes on existence	The star is equivalent to '0051292 V1292'.
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.