g Hydrae


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 g Hya, NSV 06180, 46 Hya, HR 5020, HD 115659, SAO 181543, FK5: 495, WDS 13189-2310
constellation Hydra

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


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

position, motion, parallax:

position (J2000) RA: 13h 18min 55,3sec DEC: -23 10' 18''
position (J1900) RA: 13h 13min 29sec DEC: -22 38' 38''
proper motion (J2000) RA: 0,064 arcsec/a DEC: -0,045 arcsec/a
radial velocity -5 km/s
note: suspected variable radial velocity
rotational velocity <17 km/s (uncertain) (variable)
trigonometric parallax 0,027 arcsec

magnitude

visual magnitude 3
(V on UBV Johnson system)

spectral / color information

spectral class G8-IIIa
B-V-magnitude 0,92
U-B-magnitude 0,66
R-I-magnitude 0,47

variability information

variable star identification 6180

double/multiple star system information

separation 138,4 arcsec
mag difference (of double or brightest multiple) 6,7
note Worley (1978) update of the IDS

miscellaneous information

note (category: group membership): Sirius group; UMa stream.

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

position, motion, parallax:

position (J2000) RA: 13h 18min 55,293sec DEC: -23 10' 17,66'' 0,06 arcsec source: 15
proper motion (J2000) RA: 0,0047 arcsec/a DEC: -0,045 arcsec/a source: 25
radial velocity -5 km/s source: 25
trigonometric parallax 0,027 0,003 arcsec source: 25
galactic coord. (B1950) longitude: 311,11 latitude: 39,26
GCI unit vector (J2000) X: -0,865358 Y: -0,310361 Z: -0,393486

magnitude:

visual 3 (observed) source: 25
photovisual 3,3 source: 2
photographic 4,1 source: 2

spectral information:

spectral class G5 source: 96
Morgan-Keenan G8IIIa source: 25
B-magnitude 3,92 0,05 B-V-magnitude 0,92
U-magnitude 4,58 0,05 U-B-magnitude 0,66

variability information:

source of data: 28
variability type 9
var. amplitude 0,08

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 138,4 arcsec
magnitude difference between brightest and second brightest component 7
position angle 95

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: 13h 16min 11,868sec DEC: -22 54' 29,88'' 0,005 arcsec
position (J2000) RA: 13h 18min 55,306sec DEC: -23 10' 17,63''
proper motion J1950 (FK4) RA: 0,0047 arcsec/a DEC: -0,049 arcsec/a 0,001 arcsec/a in RA
0,002 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0048 arcsec/a DEC: -0,044 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

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

spectral information:

spectral class G5
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue FK4, catalogue number: 495
Durchmusterung BD-22 3554
Boss General Catalogue 18012
Henry Draper Catalogue 115659

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

position and proper motion:

position (J2000) RA: 13h 18,9min DEC: -23 10'
proper motion (J2000) RA: 0,064 arcsec/a DEC: -0,045 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
- 1879 2 95 138,4'' 3 10 G8IIIa SMY 3

discoverer information:

discoverer code discoverer reference
SMY 3 Smythe, W.H. -

notes:

note Gamma Hya.

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

position:

position (J1950) RA: 13h 16min 11,9sec DEC: -22 54' 30''

variability informations:

magnitute at max. brightness 2,94
magnitute at min. brightness 3,02
photometric system visual, photovisual or Johnson's V

spectral information

spectral class G8

references

to a study 0138D (designation: 233)