Alphard


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 (suspected variables)


catalogues and names Alphard, a Hya, NSV 04496, 30 Hya, HR 3748, HD 81797, SAO 136871, FK5: 354, WDS 09276-0840A
other names Alfard, Kalbelaphard, Cor Hydrae, Alphart, Alfard, Alphart, Kalbelaphard, Cor Hydrae
constellation Hydra

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

note (category: star names): ALPHARD; Alfard; Alphart; Kalbelaphard; Cor Hydrae.

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

position, motion, parallax:

position (J2000) RA: 9h 27min 35,2sec DEC: -8 39' 31''
position (J1900) RA: 9h 22min 40,4sec DEC: -8 13' 30''
proper motion (J2000) RA: -0,014 arcsec/a DEC: 0,033 arcsec/a
radial velocity -4 km/s
note: suspected variable radial velocity
rotational velocity <17 km/s (uncertain) (variable)
trigonometric parallax 0,022 arcsec

magnitude

visual magnitude 1,98
(V on UBV Johnson system)

spectral / color information

spectral class K3II-III
B-V-magnitude 1,44
U-B-magnitude 1,72
R-I-magnitude 0,77
note (category: spectra): Balloon-borne spectrometer revealed pronounced emission of MgII.

variability information

variable star identification 4496

double/multiple star system information

number of components of multiple star system 3
separation 283,1 arcsec
mag difference (of double or brightest multiple) 7,5
component ID AB
note Worley (1978) update of the IDS

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

position, motion, parallax:

position (J2000) RA: 9h 27min 35,247sec DEC: -8 39' 31,15'' 0,06 arcsec source: 15
proper motion (J2000) RA: -0,0009 arcsec/a DEC: 0,033 arcsec/a source: 25
radial velocity -4 km/s source: 25
trigonometric parallax 0,022 0,002 arcsec source: 25
galactic coord. (B1950) longitude: 241,5 latitude: 29,05
GCI unit vector (J2000) X: -0,777933 Y: 0,610046 Z: -0,150547

magnitude:

visual 1,98 (observed) source: 25
photovisual 2,2 source: 2
photographic 3,2 source: 2

spectral information:

spectral class K2 source: 96
Morgan-Keenan K3II-III source: 25
B-magnitude 3,42 0,05 B-V-magnitude 1,44
U-magnitude 5,14 0,05 U-B-magnitude 1,72

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 283,1 arcsec
magnitude difference between brightest and second brightest component 7,7
position angle 153

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
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
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: 9h 25min 7,791sec DEC: -8 26' 27,47'' 0,003 arcsec
position (J2000) RA: 9h 27min 35,254sec DEC: -8 39' 31,17''
proper motion J1950 (FK4) RA: -0,0012 arcsec/a DEC: 0,028 arcsec/a 0,001 arcsec/a in RA
0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0008 arcsec/a DEC: 0,033 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

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

spectral information:

spectral class K2
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue FK4, catalogue number: 354
Durchmusterung BD-08 2680
Boss General Catalogue 13044
Henry Draper Catalogue 81797

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

position and proper motion:

position (J2000) RA: 9h 27,6min DEC: -8 40'
proper motion (J2000) RA: -0,014 arcsec/a DEC: 0,033 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 1841 4 153 283,1'' 1,98 9,7 K3II-III H 111
AC 1783 1 F 210'' 2,2 - - H 111

discoverer information:

discoverer code discoverer reference
H 111 Herschel, W. -

notes:

note AB: H VI 111. Alpha Hya. B is BD-08@2681.

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

position:

position (J1950) RA: 9h 25min 7,8sec DEC: -8 26' 27''

variability informations:

magnitute at max. brightness 1,93
magnitute at min. brightness 2,01
photometric system visual, photovisual or Johnson's V

spectral information

spectral class K3

references

to a study 0832D (designation: ALPHA HYA)

miscanellous

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