theta Persei

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

position, motion, parallax:

position (J2000)	RA: 2h 44min 12sec	DEC: +49° 13' 42''
position (B1900)	RA: 2h 37min 21.9sec	DEC: +48° 48' 20''
proper motion (J2000)	RA: 0.336 arcsec/a	DEC: -0.089 arcsec/a
radial velocity	25 km/s note: suspected variable radial velocity
rotational velocity	6 km/s (uncertain) (variable)
trigonometric parallax	0.077 arcsec
galactic coordinates	longitude: 141.16°	latitude: -9.61°

note (category: dynamical parallaxes):

0.095".

magnitude

visual magnitude

4.12
(V on UBV Johnson system)

spectral / color information

spectral class	F8V
B-V-magnitude	0.49
U-B-magnitude	0
R-I-magnitude
IR-note	object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

variability information

variable star identification

902

double/multiple star system information

number of components of multiple star system	3
separation	19.6 arcsec
mag difference (of double or brightest multiple)	5.6
component ID	AB

note (category: double and multiple data):

AB 4.13 F7V, 9.87 M1V, 2720y, a = 22.289". C probably optical.

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

position, motion, parallax:

position (J2000)	RA: 2h 44min 11.986sec	DEC: +49° 13' 42.48''	±0.06 arcsec	source: 15
proper motion (J2000)	RA: 0.0343 arcsec/a	DEC: -0.089 arcsec/a		source: 25
radial velocity	25 km/s			source: 25
trigonometric parallax	0.077 arcsec		±0.008 arcsec	source: 25
galactic coord. (B1950)	longitude: 141.17°	latitude: -9.61°

magnitude:

visual	4.12 (observed)	source: 25
photovisual	4.2	source: 2

spectral information:

spectral class	F8		source: 96
Morgan-Keenan	F8V		source: 25
B-magnitude	4.61 ±0.05	B-V-magnitude	0.49
U-magnitude	4.61 ±0.05	U-B-magnitude	0

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	19.7 arcsec
magnitude difference between brightest and second brightest component	5.9
position angle	303 °

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
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: 2h 40min 46.276sec	DEC: +49° 1' 6.45''	±0.004 arcsec
position (J2000)	RA: 2h 44min 11.99sec	DEC: +49° 13' 42.59''
proper motion B1950 (FK4)	RA: 0.0342 arcsec/a	DEC: -0.083 arcsec/a	±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0343 arcsec/a	DEC: -0.088 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	4.2 (accuracy: 2 decimals)
source of visual magnitude data	Taken from the "Henry Draper Catalogue".

spectral information:

spectral class	F8
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	FK4, catalogue number: 93
Durchmusterung	BD+48 746
Boss General Catalogue	3277
Henry Draper Catalogue	16895

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

position and proper motion:

position (J2000)	RA: 2h 44.2min	DEC: +49° 14'
proper motion (J2000)	RA: 0.336 arcsec/a	DEC: -0.09 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
AB	1832	36	295°	15.4''	4.12	10	F8V	STF 296
AB	1975	36	303°	19.7''	4.12	10	F8V	STF 296
AC	1852	11	211°	66''	4.12	9.5	-	STF 296
AC	1924	11	229°	77.2''	4.12	9.5	-	STF 296
BC	1912	1	213°	72.1''	10	-	-	STF 296

discoverer information:

discoverer code	discoverer	reference
STF 296	Struve, F.G.W.	-

notes:

note	Theta Per. Proper motion of C +009 -011. A premature orbit has been computed.

data from 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)

position:

position (B1900)

RA: 2h 37.4min

DEC: +48° 48'

magnitudes, spectral classes, orbital elements:

author:	J. Hopmann
date of observation:	1956
magnitude of component A:	4.13
magnitude of component B:	4.13
spectral class component B:	F7V
spectral class component B:	F7V
period [y]:	2720
semi-major axis [arcsec]:	22.289
inclination [deg]:	75.44
node [deg]:	128
equinox of node:	1900
eccentricity:	0.13
time of periastron passage:	1613
dates of ephemeris:	1960-1980
grade:	indeterminate
reference:	Mitt. Sternw. Wien 9, 177; 1958.

other name(s)

STF 296, Theta Per

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

position:

position (equinox 1950.0)

RA: 2h 40min 46.3sec

DEC: +49° 1' 6''

variability informations:

magnitute at max. brightness	4.09
magnitute at min. brightness	4.13
photometric system	visual, photovisual or Johnson's V

spectral information

spectral class

references

to a study

731201D (designation: HD 16895)

miscanellous

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

catalogues and names	q Per, NSV 00902, 13 Per, HR 799, HD 16895, SAO 38288, BD +48 746, FK5: 93, WDS 02442+4914A
constellation	Perseus