Head of Hydrus

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 Head of Hydrus, a Hyi, HR 591, HD 12311, SAO 248474, FK5: 72
constellation Hydrus

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

note (category: star names): Head of Hydrus.

position, motion, parallax:

position (J2000) RA: 1h 58min 46,2sec DEC: -61 34' 11''
position (J1900) RA: 1h 55min 37,1sec DEC: -62 3' 23''
proper motion (J2000) RA: 0,264 arcsec/a DEC: 0,027 arcsec/a
radial velocity 1 km/s
note: variable radial velocity
rotational velocity 153 km/s (uncertain) (variable)
trigonometric parallax 0,048 arcsec


visual magnitude 2,86
(V on UBV Johnson system)

spectral / color information

spectral class F0V
B-V-magnitude 0,28
U-B-magnitude 0,14
R-I-magnitude 0,14

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

position, motion, parallax:

position (J2000) RA: 1h 58min 46,201sec DEC: -61 34' 11,43'' 0,06 arcsec source: 15
proper motion (J2000) RA: 0,037 arcsec/a DEC: 0,027 arcsec/a source: 25
radial velocity 1 km/s source: 25
trigonometric parallax 0,048 0,005 arcsec source: 25
galactic coord. (B1950) longitude: 289,45 latitude: -53,76
GCI unit vector (J2000) X: 0,413575 Y: 0,235827 Z: -0,879398


visual 2,86 (observed) source: 25
photovisual 3 source: 2
photographic 3,3 source: 2

spectral information:

spectral class F0 source: 96
Morgan-Keenan F0III-IVn source: 25
B-magnitude 3,14 0,05 B-V-magnitude 0,28
U-magnitude 3,28 0,05 U-B-magnitude 0,14


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 57min 11,703sec DEC: -61 48' 45,44'' 0,009 arcsec
position (J2000) RA: 1h 58min 46,229sec DEC: -61 34' 11,41''
proper motion J1950 (FK4) RA: 0,0379 arcsec/a DEC: 0,033 arcsec/a 0,002 arcsec/a in RA
0,002 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0373 arcsec/a DEC: 0,027 arcsec/a
source of proper motion data Determined by source catalog


visual 3 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class F0
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.


source catalogue FK4, catalogue number: 72
Durchmusterung CP-62 162
Boss General Catalogue 2405
Henry Draper Catalogue 12311