tau Pegasi

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

note (category: star names):

Salm; Kerb; Markab; El khereb.

position, motion, parallax:

position (J2000)	RA: 23h 20min 38.2sec	DEC: +23° 44' 25''
position (2000.73)	RA: 23h 20min 40sec	DEC: +23° 44' 39''
position (B1900)	RA: 23h 15min 41.1sec	DEC: +23° 11' 35''
proper motion (J2000)	RA: 0.033 arcsec/a	DEC: -0.008 arcsec/a
radial velocity	16 km/s note: variable radial velocity
rotational velocity	143 km/s (uncertain) (variable)
trigonometric parallax	0.037 arcsec
galactic coordinates	longitude: 97.51°	latitude: -34.61°

magnitude

visual magnitude

4.6
(V on UBV Johnson system)

spectral / color information

spectral class	A5Vp
B-V-magnitude	0.17
U-B-magnitude	0.1
R-I-magnitude

note (category: spectra):

Lambda Boo star, Mg 4481, met. wk.

variability information

variable star identification

Tau Peg

note (category: variability):

Delta Sct 4.60 - 4.62V, 0.05433d, secondary 0.04895d, beat period 0.4943d.

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

position, motion, parallax:

position (J2000)	RA: 23h 20min 38.247sec	DEC: +23° 44' 25.25''	ą0.06 arcsec	source: 15
position (2000.73)	RA: 23h 20min 40sec	DEC: +23° 44' 39''	JD: 2451810.88
proper motion (J2000)	RA: 0.0024 arcsec/a	DEC: -0.007 arcsec/a		source: 25
radial velocity	16 km/s			source: 25
trigonometric parallax	0.037 arcsec		ą0.004 arcsec	source: 25
galactic coord. (B1950)	longitude: 97.52°	latitude: -34.61°

magnitude:

visual	4.6 (observed)	source: 25
photovisual	4.7	source: 2

spectral information:

spectral class	A5		source: 96
Morgan-Keenan	A5Vp		source: 25
B-magnitude	4.77 ą0.05	B-V-magnitude	0.17
U-magnitude	4.87 ą0.05	U-B-magnitude	0.1

variability information:

source of data: 30

variability type	10
var. amplitude	0.02
var. period	0.05

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
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: 23h 18min 9.505sec	DEC: +23° 27' 59.22''	ą0.004 arcsec
position (2000.73)	RA: 23h 20min 41sec	DEC: +23° 44' 40''	JD: 2451810.88
position (J2000)	RA: 23h 20min 38.245sec	DEC: +23° 44' 25.28''
proper motion B1950 (FK4)	RA: 0.0024 arcsec/a	DEC: -0.002 arcsec/a	ą0.001 arcsec/a in RA ą0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0024 arcsec/a	DEC: -0.007 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	A5
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	FK4, catalogue number: 880
Durchmusterung	BD+22 4810
Boss General Catalogue	32503
Henry Draper Catalogue	220061

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

position:

position (equinox 1950.0)

RA: 23h 18min 9.5sec

DEC: +23° 27' 59''

variability informations:

variability type	DSCTC	pulsating variable star
magnitute at max. brightness	4.6
magnitute amplitude	0.02
photometric system	visual, photovisual or Johnson's V
period [d]	0.05433

spectral information

spectral class

A5IV

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	62/9019
constellation	Pegasus
notes on existence	The star is equivalent to '0630001 R'.
There are notes in published catalog.

variability type description

variability type

description

DSCTC

Variables of the Delta Scuti type. These are pulsating variables of spectral types A0-F5 III-V displaying light amplitudes from 0.003 to 0.9 mag in V (usually several hundredths of a magnitude) and periods from 0.01 to 0.2 days. The shapes of the light curves, periods, and amplitudes usually vary greatly. Radial as well as nonradial pulsations are observed. The variability of some
members of this type appears sporadically and sometimes completely ceases, this being a consequence of strong amplitude modulation with the lower value of the amplitude not exceeding 0.001 mag in some cases. The maximum of the surface layer expansion does not lag behind the maximum light for more than 0.1 periods. DSCT stars are representatives of the galactic disk (flat component) and are phenomenologically close to the SX Phe variables.

DSCTC
Low amplitude group of Delta Sct variables (light amplitude <0.1 mag in V). The majority of this type's representatives are stars of luminosity class V; objects of this subtype generally are representative of the Delta Sct variables in open clusters.

catalogues and names	t Peg, tau Peg, 62 Peg, HR 8880, HD 220061, SAO 91186, BD +22 4810, FK5: 880
constellation	Pegasus