Al Anz

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

note (category: star names):

Al Anz; Almaaz.

position, motion, parallax:

position (J2000)	RA: 5h 1min 58.1sec	DEC: +43° 49' 24''
position (2000.73)	RA: 5h 2min 1sec	DEC: +43° 49' 28''
position (B1900)	RA: 4h 54min 47.4sec	DEC: +43° 40' 32''
proper motion (J2000)	RA: -0.001 arcsec/a	DEC: -0.004 arcsec/a
radial velocity	-3 km/s note: spectroscopic binaries, single lined spectra note: orbital data avaible
rotational velocity	29 km/s (uncertain) (variable)
trigonometric parallax	0.007 arcsec
galactic coordinates	longitude: 162.79°	latitude: 1.18°

magnitude

visual magnitude

2.99
(V on UBV Johnson system)

spectral / color information

spectral class	F0Iae+B
B-V-magnitude	0.54
U-B-magnitude	0.33
R-I-magnitude
IR-note	object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

note (category: spectra):

Shell star. Also classified A8Ia-F2epIa + B.

variability information

variable star identification

Eps Aur

note (category: variability):

ADS 3605A, EA 2.94 - 3.83V, 9892d. Spectrum var. even outside eclipse. RV and light fluctuations about 110d.

double/multiple star system information

number of components of multiple star system	6
separation	207.6 arcsec
mag difference (of double or brightest multiple)	6.2
component ID	AE

note (category: double and multiple data):

ADS 3605A. A* 2.98 var. A8Iap. Five visual and one astrometric components. AB visual binary, B, 14v at 29"; C, 11.26V, +1.83(B-V), +1.31(U-B), at 43"; D, 12.0v at 46".

note (category: spectroscopic binaries):

ADS 3605A, 9890d, K 15.0k/s, V0 -1.4k/s, msin3i 16.8, asini 2000. Unresolved by speckle interferometry.

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

position, motion, parallax:

position (J2000)	RA: 5h 1min 58.133sec	DEC: +43° 49' 23.83''	ą0.06 arcsec	source: 15
position (2000.73)	RA: 5h 2min 1sec	DEC: +43° 49' 28''	JD: 2451810.11
proper motion (J2000)	RA: -0.0001 arcsec/a	DEC: -0.004 arcsec/a		source: 25
radial velocity	-3 km/s			source: 25
trigonometric parallax	0.003 arcsec		-	source: 25
galactic coord. (B1950)	longitude: 162.79°	latitude: 1.18°

magnitude:

visual

2.9 (observed)

source: 31

spectral information:

spectral class	F5		source: 96
Morgan-Keenan	F0Iae+B		source: 25
B-magnitude	3.53 ą0.05	B-V-magnitude	0.54
U-magnitude	3.86 ą0.05	U-B-magnitude	0.33

variability information:

source of data: 30

variability type	10
var. amplitude	0.91
var. period	9892
var. epoch	2435629 4. June 1956, 12:00:00 UT
next max light	2455413 4. August 2010, 12:00:00 UT

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	21.2 arcsec
magnitude difference between brightest and second brightest component	11
position angle	224 °

component	magnitude	spectral class	catalogue(s)/name(s)
A	2.9	F5	Al Anz, e Aurigae, 7 Aur, HR 1605, HD 31964, SAO 39955
B	9.46	B0

sources:

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
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: 4h 58min 22.53sec	DEC: +43° 45' 5.36''	ą0.004 arcsec
position (2000.73)	RA: 5h 2min 2sec	DEC: +43° 49' 27''	JD: 2451810.11
position (J2000)	RA: 5h 1min 58.14sec	DEC: +43° 49' 23.7''
proper motion B1950 (FK4)	RA: 0.0001 arcsec/a	DEC: -0.004 arcsec/a	ą0.001 arcsec/a in RA ą0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0 arcsec/a	DEC: -0.005 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	3.5 (accuracy: 2 decimals)
source of visual magnitude data	Arithmetic mean of maximum and minimum magnitudes of a variable star

spectral information:

spectral class	F5p
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

remarks for duplicity and variability

Variable star in visual magnitude in source catalog

catalogues

source catalogue	FK4, catalogue number: 183
Durchmusterung	BD+43 1166
Boss General Catalogue	6123
Henry Draper Catalogue	31964

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

position and proper motion:

position (J2000)	RA: 5h 2min	DEC: +43° 49'
proper motion (J2000)	RA: -0.001 arcsec/a	DEC: -0.004 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	1878	5	224°	21.2''	2.99	14	F0Iae	BU 554
AC	1878	6	275°	43''	2.99	11.26	-	BU 554
AD	1879	5	317°	46.2''	2.99	12	-	BU 554
AE	1913	2	48°	207.6''	2.99	9.2	-	BU 554

discoverer information:

discoverer code	discoverer	reference
BU 554	Burnham, S.W.	-

notes:

note	Epsilon Aur. A is a enigmatic supergiant eclipsing system.

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

position:

position (equinox 1950.0)

RA: 4h 58min 22.5sec

DEC: +43° 45' 5''

variability informations:

variability type	EA/GS	close binary eclipsing system
magnitute at max. brightness	2.92
magnitute at min. brightness	3.83
photometric system	visual, photovisual or Johnson's V
epoch for maximum light [JD]	2435629 4. June 1956, 12:00:00 UT
period [d]	9892
next maximum light [JD]	2455413 4. August 2010, 12:00:00 UT
duration of the eclipse	08 % of period

spectral information

spectral class

A8Ia-F2epIa+BV

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	8/9005
constellation	Auriga
notes on existence	The star is equivalent to '0089006 zet'.
There are notes in published catalog.

variability type description

variability type	description
EA	Eclipsing binary systems. These are binary systems with orbital planes so close to the observer's line of sight (the inclination i of the orbital plane to the plane orthogonal to the line of sight is close to 90 deg) that the components periodically eclipse each other. Consequently, the observer finds changes of the apparent combined brightness of the system with the period coincident with that of the components' orbital motion. EA Algol (Beta Persei)-type eclipsing systems. Binaries with spherical or slightly ellipsoidal components. It is possible to specify, for their light curves, the moments of the beginning and end of the eclipses. Between eclipses the light remains almost constant or varies insignificantly because of reflection effects, slight ellipsoidality of components, or physical variations. Secondary minima may be absent. An extremely wide range of periods is observed, from 0.2 to >= 10000 days. Light amplitudes are also quite different and may reach several magnitudes. EB Beta Lyrae-type eclipsing systems. These are eclipsing systems having ellipsoidal components and light curves for which it is impossible to specify the exact times of onset and end of eclipses because of a continuous change of a system's apparent combined brightness between eclipses; secondary minimum is observed in all cases, its depth usually being considerably smaller than that of the primary minimum; periods are mainly longer than 1 day. The components generally belong to early spectral types (B-A). Light amplitudes are usually <2 mag in V. EW W Ursae Majoris-type eclipsing variables. These are eclipsers with periods shorter than 1 days, consisting of ellipsoidal components almost in contact and having light curves for which it is impossible to specify the exact times of onset and end of eclipses. The depths of the primary and secondary minima are almost equal or differ insignificantly. Light amplitudes are usually <0.8 mag in V. The components generally belong to spectral types F-G and later.
GS	Systems with one or both giant and supergiant components; one of the components may be a main sequence star.

catalogues and names	Al Anz, e Aur, eps Aur, 7 Aur, HR 1605, HD 31964, SAO 39955, BD +43 1166, FK5: 183, WDS 05020+4349A
other names	Almaaz
constellation	Auriga