tau Cassiopeiae

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

position, motion, parallax:

position (J2000)	RA: 23h 47min 3.5sec	DEC: +58° 39' 7''
position (B1900)	RA: 23h 42min 9.9sec	DEC: +58° 5' 42''
proper motion (J2000)	RA: 0.061 arcsec/a	DEC: 0.057 arcsec/a
radial velocity	-21 km/s note: variable radial velocity
rotational velocity	<17 km/s (uncertain) (variable)
trigonometric parallax	0.014 arcsec
galactic coordinates	longitude: 114.63°	latitude: -3.18°

magnitude

visual magnitude

4.87
(V on UBV Johnson system)

spectral / color information

spectral class	K1IIIa
B-V-magnitude	1.11
U-B-magnitude	1.05
IR-note	object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

variability information

variable star identification

14707

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

position, motion, parallax:

magnitude:

visual	4.87 (observed)	source: 25
photovisual	5.1	source: 2

spectral information:

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
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 44min 36.094sec	DEC: +58° 22' 24.18''	±0.014 arcsec
position (J2000)	RA: 23h 47min 3.528sec	DEC: +58° 39' 6.91''
proper motion B1950 (FK4)	RA: 0.0079 arcsec/a	DEC: 0.059 arcsec/a	±0.002 arcsec/a in RA ±0.002 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0081 arcsec/a	DEC: 0.054 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	K0
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)

position:

position (equinox 1950.0)

RA: 23h 44min 36.1sec

DEC: +58° 22' 24''

variability informations:

magnitute at max. brightness	4.87
magnitute amplitude	0.3:
photometric system	visual, photovisual or Johnson's V

spectral information

spectral class

references

to a study

742525D (designation: TAU CAS)

miscanellous

There are notes in the published catalog (Kukarkin et al.(1982)).

catalogues and names	t Cas, NSV 14707, 5 Cas, HR 9008, HD 223165, SAO 35763, BD +57 2804, FK5: 3909
constellation	Cassiopeia