catalogues and names

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

SKY2000 - Master Star Catalog

Smithsonian Astrophysical Observatory Star Catalog

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

catalogues and names

catalogues and names	p Aqr, pi Aqr, 52 Aqr, HR 8539, HD 212571, SAO 127520, BD +0 4872, FK5: 1585
constellation	Aquarius

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

position, motion, parallax:

position (J2000)	RA: 22h 25min 16.6sec	DEC: +1° 22' 39''
position (B1900)	RA: 22h 20min 10.2sec	DEC: +0° 52' 12''
proper motion (J2000)	RA: 0.019 arcsec/a	DEC: 0.001 arcsec/a
radial velocity	4 km/s note: variable radial velocity
rotational velocity	278 km/s (uncertain) (variable)
galactic coordinates	longitude: 66.01°	latitude: -44.74°

note (category: radial and/or rotational velocities):

2-6y.

magnitude

visual magnitude

4.66 (V on UBV Johnson system)

spectral / color information

spectral class	B1Ve
B-V-magnitude	-0.03
U-B-magnitude	-0.98
R-I-magnitude
IR-note	object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

note (category: spectra):

Shell star. Also classified B1III-IVe.

variability information

variable star identification

Pi Aqr

note (category: variability):

Gamma Cas 4.42 - 4.70V. Variable magnitude, RV and emission lines due to slow rotation of line of apsides of rapidly rotating equatorial shell. Spectrum variable 0.087d. Variable polarization.

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

position, motion, parallax:

position (J2000)	RA: 22h 25min 16.627sec	DEC: +1° 22' 38.51''	±0.06 arcsec	source: 15
proper motion (J2000)	RA: 0.0013 arcsec/a	DEC: 0.001 arcsec/a		source: 25
radial velocity	4 km/s			source: 25
galactic coord. (B1950)	longitude: 66.02°	latitude: -44.74°

magnitude:

visual	4.4 (observed)	source: 31
photovisual	4.6	source: 2

spectral information:

spectral class	B1		source: 96
Morgan-Keenan	B1Ve		source: 25
B-magnitude	4.63 ±0.05	B-V-magnitude	-0.03
U-magnitude	3.65 ±0.05	U-B-magnitude	-0.98

variability information:

source of data: 30

variability type	264
var. amplitude	0.28

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
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: 22h 22min 43.382sec	DEC: +1° 7' 22.87''	±0.005 arcsec
position (J2000)	RA: 22h 25min 16.629sec	DEC: +1° 22' 38.46''
proper motion B1950 (FK4)	RA: 0.0012 arcsec/a	DEC: 0.005 arcsec/a	±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0014 arcsec/a	DEC: 0 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	4.6 (accuracy: 2 decimals)
source of visual magnitude data	Taken from the "Henry Draper Catalogue".

spectral information:

spectral class	B1p
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	FK4, catalogue number: 1585
Durchmusterung	BD+00 4872
Boss General Catalogue	31328
Henry Draper Catalogue	212571

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

position:

position (equinox 1950.0)

RA: 22h 22min 43.4sec

DEC: +1° 7' 23''

variability informations:

variability type	GCAS	eruptive variable star
magnitute at max. brightness	4.42
magnitute at min. brightness	4.7
photometric system	visual, photovisual or Johnson's V

spectral information

spectral class

B1Ve

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	4/9016
constellation	Aquarius
notes on existence	The star is equivalent to '0049022 khi'.
There are notes in published catalog.

variability type description

variability type	description
GCAS	Eruptive irregular variables of the Gamma Cas type. These are rapidly rotating B III-IVe stars with mass outflow from their equatorial zones. The formation of equatorial rings or disks is often accompanied by temporary fading. Light amplitudes may reach 1.5 mag in V.