b Hydri

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. Combined General Catalogue of Variable Stars (suspected variables)

catalogues and names b Hyi, NSV 00161, HR 98, HD 2151, SAO 255670, FK5: 11
constellation Hydrus

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

object is infrared source (Engels et al., 1982)

position, motion, parallax:

position (J2000) RA: 0h 25min 45,1sec DEC: -77 15' 15''
position (J1900) RA: 0h 20min 30sec DEC: -77 49' 3''
proper motion (J2000) RA: 2,215 arcsec/a DEC: 0,324 arcsec/a
radial velocity 23 km/s
trigonometric parallax 0,153 arcsec


visual magnitude 2,8
(V on UBV Johnson system)

spectral / color information

spectral class G2IV
B-V-magnitude 0,62
U-B-magnitude 0,11
R-I-magnitude 0,34
note (category: spectra): Lithium/calcium ratio = 10 times solar value.

variability information

variable star identification 161
note (category: variability): 2.75 - 2.81V.

miscellaneous information

note (category: group membership): Zeta Her group.

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

position, motion, parallax:

position (J2000) RA: 0h 25min 45,056sec DEC: -77 15' 15,4'' 0,06 arcsec source: 15
proper motion (J2000) RA: 0,6692 arcsec/a DEC: 0,324 arcsec/a source: 25
radial velocity 23 km/s source: 25
trigonometric parallax 0,153 0,015 arcsec source: 25
galactic coord. (B1950) longitude: 304,81 latitude: -39,77
GCI unit vector (J2000) X: 0,219233 Y: 0,024737 Z: -0,975359


visual 2,8 (observed) source: 25
photovisual 2,9 source: 2
photographic 3,5 source: 2

spectral information:

spectral class G0 source: 96
Morgan-Keenan G1IV source: 25
B-magnitude 3,42 0,05 B-V-magnitude 0,62
U-magnitude 3,53 0,05 U-B-magnitude 0,11

variability information:

source of data: 28
variability type 9
var. amplitude 0,06


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: 0h 23min 9,374sec DEC: -77 32' 8,5'' 0,007 arcsec
position (J2000) RA: 0h 25min 45,217sec DEC: -77 15' 15,63''
proper motion J1950 (FK4) RA: 0,6884 arcsec/a DEC: 0,327 arcsec/a 0,001 arcsec/a in RA
0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,6712 arcsec/a DEC: 0,322 arcsec/a
source of proper motion data Determined by source catalog


visual 2,9 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class G0
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.


source catalogue FK4, catalogue number: 11
Durchmusterung CP-77 16
Boss General Catalogue 503
Henry Draper Catalogue 2151

data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)


position (J1950) RA: 0h 23min 9,4sec DEC: -77 32' 9''

variability informations:

magnitute at max. brightness 2,75
magnitute at min. brightness 2,81
photometric system visual, photovisual or Johnson's V

spectral information

spectral class G0


to a study 0832D (designation: BETA HYI)


There are notes in the published catalog (Kukarkin et al.(1982)).