12 Persei

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

position, motion, parallax:

position (J2000)	RA: 2h 42min 14.9sec	DEC: +40° 11' 38''
position (B1900)	RA: 2h 35min 56sec	DEC: +39° 46' 16''
proper motion (J2000)	RA: -0.019 arcsec/a	DEC: -0.186 arcsec/a
radial velocity	-23 km/s note: spectroscopic binaries, double lined spectra note: orbital data avaible
rotational velocity	<25 km/s (uncertain) (variable)
trigonometric parallax	0.043 arcsec
galactic coordinates	longitude: 144.84°	latitude: -17.91°

note (category: dynamical parallaxes):

0.046".

magnitude

visual magnitude

4.91
(V on UBV Johnson system)

spectral / color information

spectral class	F9V
B-V-magnitude	0.59
U-B-magnitude	0.14
R-I-magnitude

variability information

variable star identification

896

double/multiple star system information

separation	0.1 arcsec
mag difference (of double or brightest multiple)	0.3
note	doublicity discoverd by speckle interferometry

note (category: double and multiple data):

0.906y, a = 0.057".

note (category: spectroscopic binaries):

331.0d, K 21.4k/s, V0 -21.5k/s, msin3i 0.744, asini 72.3. Speckle interferometer measurements combined with spectroscopic yield masses 1.28 and 1.05 solar. Speckle interferometric sep. 0.047", 1981.68.

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

position, motion, parallax:

position (J2000)	RA: 2h 42min 14.909sec	DEC: +40° 11' 38.02''	±0.22 arcsec	source: 15
proper motion (J2000)	RA: -0.0017 arcsec/a	DEC: -0.186 arcsec/a		source: 25
radial velocity	-23 km/s			source: 25
trigonometric parallax	0.043 arcsec		±0.004 arcsec	source: 25
galactic coord. (B1950)	longitude: 144.85°	latitude: -17.91°

magnitude:

visual	4.91 (observed)	source: 25
photovisual	5	source: 2

spectral information:

spectral class	G0		source: 96
Morgan-Keenan	F9V		source: 25
B-magnitude	5.5 ±0.05	B-V-magnitude	0.59
U-magnitude	5.64 ±0.05	U-B-magnitude	0.14

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: 2h 39min 4.982sec	DEC: +39° 59' 1.47''	±0.013 arcsec
position (J2000)	RA: 2h 42min 14.935sec	DEC: +40° 11' 37.81''
proper motion B1950 (FK4)	RA: -0.0014 arcsec/a	DEC: -0.184 arcsec/a	±0.003 arcsec/a in RA ±0.002 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0014 arcsec/a	DEC: -0.187 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	5 (accuracy: 2 decimals)
source of visual magnitude data	Taken from Harvard or San Luis photometry.

spectral information:

spectral class	G0
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	GC, catalogue number: 3245
Durchmusterung	BD+39 610
Boss General Catalogue	3245
Henry Draper Catalogue	16739

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

position and proper motion:

position (J2000)	RA: 2h 42.2min	DEC: +40° 12'
proper motion (J2000)	RA: -0.019 arcsec/a	DEC: -0.186 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
-	1975	27	°	''	4.91	-	F9V	MCA 8

discoverer information:

discoverer code	discoverer	reference
MCA 8	McAlister, H.A.	(Astrophys. J. Suppl. 51, 309; 1983.)

notes:

note	12 Per. Double-lined spectroscopic binary resolved by speckle interferometry.

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

position:

position (B1900)

RA: 2h 35.9min

DEC: +39° 46'

magnitudes, spectral classes, orbital elements:

author:	H.A. McAlister
magnitude of component A:	5.5
magnitude of component B:	5.5
spectral class component B:	F9V
spectral class component B:	F9V
period [y]:	0.906
semi-major axis [arcsec]:	0.057
inclination [deg]:	123
node [deg]:	227.9 (ascending)
eccentricity:	0.67
time of periastron passage:	1900
grade:	good
reference:	Astrophys. J. 223, 526; 1978.

notes

Double-lined spectroscopic binary, resolved by speckle interferometry. The elements P = 331.0 d, T, e, and the longitude of periastron are from the orbit by Colacevich (1941).

other name(s)

12 Per

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

position:

position (equinox 1950.0)

RA: 2h 39min 5sec

DEC: +39° 59' 1''

variability informations:

magnitute at max. brightness	4.88
magnitute at min. brightness	4.94
photometric system	visual, photovisual or Johnson's V

spectral information

spectral class

references

to a study

140098D (designation: 12 PER)

miscanellous

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

catalogues and names	NSV 00896, 12 Per, HR 788, HD 16739, SAO 55793, BD +39 610, FK5: 2187, WDS 02422+4012
constellation	Perseus