Achernar


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


catalogues and names Achernar, a Eri, NSV 15353, HR 472, HD 10144, SAO 232481, FK5: 54
constellation Eridanus

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

note (category: star names): ACHERNAR.

position, motion, parallax:

position (J2000) RA: 1h 37min 42,9sec DEC: -57 14' 12''
position (J1900) RA: 1h 33min 59,4sec DEC: -57 44' 41''
proper motion (J2000) RA: 0,095 arcsec/a DEC: -0,035 arcsec/a
radial velocity 16 km/s
note: variable radial velocity
rotational velocity 251 km/s (uncertain) (variable)
trigonometric parallax 0,026 arcsec
note (category: radial and/or rotational velocities): Period in RV and light (1.26d) seems best explained by rotation. Weak but significant variations in strength of MgII 4481. RV of H gamma and HeI 4471 consistent with period, amp. 30k/s. Variable light amp. 0.02V.

magnitude

visual magnitude 0,46
(V on UBV Johnson system)

spectral / color information

spectral class B3Vpe
B-V-magnitude -0,16
U-B-magnitude -0,66
R-I-magnitude -0,11
note (category: spectra): Lyman alpha and Lyman beta observed from COPERNICUS. H alpha and H beta var. emission and possible high-velocity mass loss. Expanding circumstellar shell.

variability information

variable star identification Var
note (category: variability): EB or Ell, amp. 0.02V. H alpha var. emission and possible high-velocity mass loss. Expanding circumstellar shell.

miscellaneous information

note (category: group membership): Member of Pleiades group.
note (category: stellar radii or diameters): Diam. = 0.00185 - 0.00192".

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

position, motion, parallax:

position (J2000) RA: 1h 37min 42,852sec DEC: -57 14' 12,18'' 0,06 arcsec source: 15
proper motion (J2000) RA: 0,0117 arcsec/a DEC: -0,035 arcsec/a source: 25
radial velocity 16 km/s source: 25
trigonometric parallax 0,026 0,003 arcsec source: 25
galactic coord. (B1950) longitude: 290,84 latitude: -58,79
GCI unit vector (J2000) X: 0,492723 Y: 0,223805 Z: -0,840914

magnitude:

visual 0,46 (observed) source: 25
photovisual 0,6 source: 2
photographic 0,5 source: 2

spectral information:

spectral class B5 source: 96
Morgan-Keenan B3Vnp(shell) source: 25
B-magnitude 0,3 0,05 B-V-magnitude -0,16
U-magnitude -0,36 0,05 U-B-magnitude -0,66

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 (J1950) RA: 1h 35min 51,307sec DEC: -57 29' 24,93'' 0,008 arcsec
position (J2000) RA: 1h 37min 42,925sec DEC: -57 14' 12,13''
proper motion J1950 (FK4) RA: 0,0129 arcsec/a DEC: -0,028 arcsec/a 0,001 arcsec/a in RA
0,002 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0127 arcsec/a DEC: -0,034 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 0,6 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class B5
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue FK4, catalogue number: 54
Durchmusterung CP-57 334
Boss General Catalogue 1979
Henry Draper Catalogue 10144