a Doradus

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. 4th Catalog of Orbits of Visual Binaries

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

catalogues and names a Dor, alf Dor, HR 1465, HD 29305, SAO 233564, FK5: 171, WDS 04340-5503A
constellation Dorado

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

position, motion, parallax:

position (J2000) RA: 4h 33min 59,8sec DEC: -55 2' 42''
position (J1900) RA: 4h 31min 50sec DEC: -55 15' 6''
proper motion (J2000) RA: 0,051 arcsec/a DEC: -0,003 arcsec/a
radial velocity 26 km/s
rotational velocity 82 km/s (uncertain) (variable)
trigonometric parallax 0,018 arcsec


visual magnitude 3,27
(V on UBV Johnson system)

spectral / color information

spectral class A0IIISi
B-V-magnitude -0,1
U-B-magnitude -0,35
R-I-magnitude -0,09

variability information

variable star identification Alp Dor
note (category: variability): Alpha CV 3.26 - 3.30V, amp. 0.10u, 2.943d.

double/multiple star system information

number of components of multiple star system 3
separation 0,2 arcsec
mag difference (of double or brightest multiple) 0,5
note Worley (1978) update of the IDS
note (category: double and multiple data): 3.8 A0IIIp, 4.3 B9IV, 13.00y, a = 0.212". Combined mag., colors. Companion 10v at 78" optical.

miscellaneous information

note (category: group membership): Member of Pleiades group.

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

position, motion, parallax:

position (J2000) RA: 4h 33min 59,781sec DEC: -55 2' 42,21'' 0,06 arcsec source: 15
proper motion (J2000) RA: 0,006 arcsec/a DEC: -0,004 arcsec/a source: 25
radial velocity 26 km/s source: 25
trigonometric parallax 0,018 0,002 arcsec source: 25
galactic coord. (B1950) longitude: 263,83 latitude: -41,42
GCI unit vector (J2000) X: 0,209989 Y: 0,533063 Z: -0,819603


visual 3,27 (observed) source: 25
photovisual 3,5 source: 2
photographic 3,5 source: 2

spectral information:

spectral class A0 source: 96
Morgan-Keenan A0IIISi source: 25
B-magnitude 3,17 0,05 B-V-magnitude -0,1
U-magnitude 2,82 0,05 U-B-magnitude -0,35

variability information:

source of data: 30
variability type 160
var. amplitude 0,04
var. period 2,95
var. epoch 2443481
3. December 1977, 12:00:00 UT
next max light 2451620,05
16. March 2000, 13:12:00 UT

double/multiple star system information:

source of data: 19
magnitude difference between brightest and second brightest component 0,4

component magnitude spectral class catalogue(s)/name(s)
A 3,27 A0 a Doradus, HR 1465, HD 29305, SAO 233564
B 10,1 -


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
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: 4h 32min 54,798sec DEC: -55 8' 51,78'' 0,009 arcsec
position (J2000) RA: 4h 33min 59,821sec DEC: -55 2' 42,14''
proper motion J1950 (FK4) RA: 0,0061 arcsec/a DEC: 0,001 arcsec/a 0,002 arcsec/a in RA
0,002 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0064 arcsec/a DEC: -0,003 arcsec/a
source of proper motion data Determined by source catalog


visual 3,5 (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: 171
Durchmusterung CP-55 663
Boss General Catalogue 5600
Henry Draper Catalogue 29305

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

position and proper motion:

position (J2000) RA: 4h 34min DEC: -55 3'
proper motion (J2000) RA: 0,051 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 1956 24 '' 3,8 4,2 A0IIIs B 2092
AB-C 1836 5 108 82,3'' 3,5 10 - HJ 3668
1965 97 77,6''

discoverer information:

discoverer code discoverer reference
B 2092 Bos, W.H. van den -
HJ 3668 Herschel, J. -


note Alpha Dor. P = 12yr., a = 0.20", motion direct.

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


position (J1900) RA: 4h 31,8min DEC: -55 15'

magnitudes, spectral classes, orbital elements:

author: G.F.G. Knipe
date of observation: 1966
magnitude of component A: 3,8
magnitude of component B: 3,8
spectral class component B: A0III
spectral class component B: A0III
period [y]: 13
semi-major axis [arcsec]: 0,212
inclination [deg]: 54,1
node [deg]: 118,7
eccentricity: 0,84
time of periastron passage: 1962,6
dates of ephemeris: 1967-1974
grade: reliable
reference: Repub. Obs. Circ. 7, 113; 1966.
other name(s) B 2092, Alpha Dor

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


position (J1950) RA: 4h 32min 54,8sec DEC: -55 8' 52''

variability informations:

variability type ACV rotating variable star
magnitute at max. brightness 3,26
magnitute at min. brightness 3,3
photometric system visual, photovisual or Johnson's V
epoch for maximum light [JD] 2443481,5
4. December 1977, 00:00:00 UT
period [d] 2,95
next maximum light [JD] 2451620,55
17. March 2000, 01:12:00 UT
rising time 50 % of period

spectral information

spectral class A0IIIp(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 'Cape Photographic Durchmusterung'


ID in the GCVS catalogue 33/9001
constellation Dorado
notes on existence The star is equivalent to '0339002 bet'.
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.