q Aurigae

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 q Aur, tet Aur, 37 Aur, HR 2095, HD 40312, SAO 58636, WDS 05597+3713A
constellation Auriga

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

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

position, motion, parallax:

position (J2000) RA: 5h 59min 43,3sec DEC: +37 12' 45''
position (J1900) RA: 5h 52min 54,1sec DEC: +37 12' 21''
proper motion (J2000) RA: 0,048 arcsec/a DEC: -0,081 arcsec/a
radial velocity 30 km/s
note: spectroscopic binaries
rotational velocity 49 km/s (uncertain) (variable)
trigonometric parallax 0,022 arcsec
note (category: dynamical parallaxes): 0.032".


visual magnitude 2,62
(V on UBV Johnson system)

spectral / color information

spectral class A0pSi
B-V-magnitude -0,08
U-B-magnitude -0,18
R-I-magnitude -0,06

variability information

variable star identification The Aur
note (category: variability): ADS 4566B. Alpha CV 2.62 - 2.70V. Amp. 0.43m at 1400A, 1.3735d. Magnetic field varies 3.618d.

double/multiple star system information

number of components of multiple star system 4
separation 3,5 arcsec
mag difference (of double or brightest multiple) 4,5
component ID AB
note (category: double and multiple data): AB binary , combined mag., colors. B is 7.2v G2V. C, 11v at 49" optical.

miscellaneous information

note (category: stellar radii or diameters): Radius 3.3 solar.

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

position, motion, parallax:

position (J2000) RA: 5h 59min 43,239sec DEC: +37 12' 45,57'' 0,43 arcsec source: 16
proper motion (J2000) RA: 0,0038 arcsec/a DEC: -0,065 arcsec/a source: 25
radial velocity 30 km/s source: 25
trigonometric parallax 0,022 0,002 arcsec source: 25
galactic coord. (B1950) longitude: 174,34 latitude: 6,73
GCI unit vector (J2000) X: 0,000971 Y: 0,796396 Z: 0,604775


visual 2,6 (observed) source: 31
photovisual 2,7 source: 2
photographic 2,7 source: 16

spectral information:

spectral class A0 source: 96
Morgan-Keenan A0pSi source: 25
B-magnitude 2,54 0,05 B-V-magnitude -0,08
U-magnitude 2,36 0,05 U-B-magnitude -0,18

variability information:

source of data: 30
variability type 160
var. amplitude 0,08
var. period 1,37

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 3,5 arcsec
magnitude difference between brightest and second brightest component 4,5
position angle 314

component magnitude spectral class catalogue(s)/name(s)
A 2,6 A0 q Aurigae, 37 Aur, HR 2095, HD 40312, SAO 58636
B 9,2 -


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
16 PPM North and PPM South Catalogs and PPM Supplement
Roser, S., and U. Bastian, "Catalogue of Positions and Proper Motions," A&AS, Vol. 74, p. 449, 1988, and Bastian, U., et al., "Catalogue of Positions and Proper Motions - South," 1993
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 56min 18,627sec DEC: +37 12' 40,05'' 0,009 arcsec
position (J2000) RA: 5h 59min 43,3sec DEC: +37 12' 44,66''
proper motion J1950 (FK4) RA: 0,0041 arcsec/a DEC: -0,082 arcsec/a 0,002 arcsec/a in RA
0,002 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,004 arcsec/a DEC: -0,081 arcsec/a
source of proper motion data Determined by source catalog


visual 2,7 (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 HD with M stars reclassified by Miss Cannon.


source catalogue FK3, catalogue number: 228
Durchmusterung BD+37 1380
Boss General Catalogue 7557
Henry Draper Catalogue 40312

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

position and proper motion:

position (J2000) RA: 5h 59,7min DEC: +37 13'
proper motion (J2000) RA: 0,044 arcsec/a DEC: -0,078 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 1871 95 6 2,2'' 2,7 7,2 A0pSi STT 545
1988 314 3,5''
AC 1852 18 291 43,2'' 2,7 10,7 - STT 545
1963 298 51,5''
AD 1840 8 351 123,3'' 2,7 9,2 - STT 545
1924 350 130,7''

discoverer information:

discoverer code discoverer reference
STT 545 Struve, O. -


note Theta Aur. A is a variable of the Alpha CVn type.

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


position (J1950) RA: 5h 56min 18,6sec DEC: +37 12' 40''

variability informations:

variability type ACV rotating variable star
magnitute at max. brightness 2,62
magnitute at min. brightness 2,7
photometric system visual, photovisual or Johnson's V
period [d] 1,3735

spectral information

spectral class B9.5p(Si)


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 8/9008
constellation Auriga
notes on existence The star is equivalent to '0089016 pi'.
There are notes in published catalog.

variability type description

variability type description
ACV Alpha2 Canum Venaticorum variables. These are main-sequence stars with spectral types B8p-A7p and displaying strong magnetic fields.
Spectra show abnormally strong lines of Si, Sr, Cr, and rare earths whose intensities vary with rotation. They exhibit magnetic field and brightness changes (periods of 0.5-160 days or more). The amplitudes of the brightness changes are usually withine 0.01-0.1 mag in V.

Rapidly oscillating Alpha2 CVn variables. These are nonradially pulsating, rotating magnetic variables of Ap spectral type (DO Eri). Pulsation periods are in the range of 6-12 mmag (0.004-0.01 days), while amplitudes of light variation caused by the pulsation are about 0.01 mag in V. The pulsational variations are superposed on those caused by rotation.