The object was found in the following catalogues:
  1. The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

  2. SKY2000 - Master Star Catalog

  3. Smithsonian Astrophysical Observatory Star Catalog

  4. The Washington Visual Double Star Catalog, 1996.0

  5. Combined General Catalogue of Variable Stars (Vol. I-III)

catalogues and names Menkalinan, b Aur, bet Aur, 34 Aur, HR 2088, HD 40183, SAO 40750, FK5: 227, WDS 05595+4457A
other names Menkalina
constellation Auriga

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

note (category: star names): Menkalinan; Menkalina.

object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

position, motion, parallax:

position (J2000) RA: 5h 59min 31,7sec DEC: +44 56' 51''
position (J1900) RA: 5h 52min 11,5sec DEC: +44 56' 15''
proper motion (J2000) RA: -0,057 arcsec/a DEC: 0 arcsec/a
radial velocity -18 km/s
note: spectroscopic binaries, double lined spectra
note: orbital data avaible
rotational velocity 37 km/s (uncertain) (variable)
trigonometric parallax 0,041 arcsec


visual magnitude 1,9
(V on UBV Johnson system)

spectral / color information

spectral class A2IV
B-V-magnitude 0,03
U-B-magnitude 0,05
R-I-magnitude -0,01

variability information

variable star identification Bet Aur
note (category: variability): ADS 4556A, EA 1.89 - 1.98V, 1.93 - 2.02B, A2+A2, 3.9600421d, i 78.5d.

double/multiple star system information

number of components of multiple star system 3
separation 184,6 arcsec
mag difference (of double or brightest multiple) 8,9
component ID AB
note (category: double and multiple data): AB binary. C, 14.1v at 13".
note (category: spectroscopic binaries): ADS 4556A, 3.9600d, K 107.5k/s, V0 -17.1k/s, msin3i 2.20, asini 5.85. Masses 2.33, 2.25 solar. Rotational velocities both components <30k/s. Second SB ever discovered, by Antonia Maury, 1889.

miscellaneous information

note (category: group membership): In Ursa cluster; Sirius group; UMa stream; UMa cluster.
note (category: stellar radii or diameters): Radius relative to Sun = 3.0.

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

position, motion, parallax:

position (J2000) RA: 5h 59min 31,72sec DEC: +44 56' 50,78'' 0,06 arcsec source: 15
proper motion (J2000) RA: -0,0054 arcsec/a DEC: 0 arcsec/a source: 25
radial velocity -18 km/s source: 25
trigonometric parallax 0,041 0,004 arcsec source: 25
galactic coord. (B1950) longitude: 167,46 latitude: 10,41
GCI unit vector (J2000) X: 0,001456 Y: 0,707754 Z: 0,706458


visual 1,886 (observed) source: 31
photovisual 2,1 source: 2

spectral information:

spectral class A0 source: 96
Morgan-Keenan A2IV source: 25
B-magnitude 1,93 0,05 B-V-magnitude 0,03
U-magnitude 1,98 0,05 U-B-magnitude 0,05

variability information:

source of data: 30
variability type 10
var. amplitude 0,09
var. period 3,96
var. epoch 2431077
18. December 1943, 12:00:00 UT
next max light 2451617,52
14. March 2000, 00:28:48 UT

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 184,6 arcsec
magnitude difference between brightest and second brightest component 8,7
position angle 39


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
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 (J1950) RA: 5h 55min 51,579sec DEC: +44 56' 40,69'' 0,004 arcsec
position (J2000) RA: 5h 59min 31,733sec DEC: +44 56' 50,72''
proper motion J1950 (FK4) RA: -0,0052 arcsec/a DEC: -0,001 arcsec/a 0,001 arcsec/a in RA
0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0053 arcsec/a DEC: 0 arcsec/a
source of proper motion data Determined by source catalog


visual 2,1 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class A0p
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.


source catalogue FK4, catalogue number: 227
Durchmusterung BD+44 1328
Boss General Catalogue 7543
Henry Draper Catalogue 40183

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

position and proper motion:

position (J2000) RA: 5h 59,5min DEC: +44 57'
proper motion (J2000) RA: -0,057 arcsec/a DEC: 0 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 1841 7 39 184,6'' 1,9 10,6 A2IV H 88
Aa 1901 2 181 12,6'' 1,9 14,1 - BAR 29
1934 174 12,8''

discoverer information:

discoverer code discoverer reference
H 88 Herschel, W. -
BAR 29 Barnard, E.E. -


note H VI 88. Beta Aur. An Algol-type system, P = 3.96d.

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


position (J1950) RA: 5h 55min 51,6sec DEC: +44 56' 41''

variability informations:

variability type EA/DM close binary eclipsing system
magnitute at max. brightness 1,89
magnitute at min. brightness 1,98
photometric system visual, photovisual or Johnson's V
epoch for maximum light [JD] 2431076,719
18. December 1943, 05:15:22 UT
period [d] 3,9600421
next maximum light [JD] 2451617,4573727
13. March 2000, 22:58:37 UT
duration of the eclipse 06 % of period
the duration of the light constancy phase at minimum light is equal to zero

spectral information

spectral class A2IV+A2IV-V


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'


ID in the GCVS catalogue 8/9002
constellation Auriga
notes on existence The star is equivalent to '0089005 eps'.
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.

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.

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.

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.
DM Detached main-sequence systems. Both components are main-sequence stars and do not fill their inner Roche lobes.