Gienah Ghurab
catalogues and names | Gienah Ghurab, g Crv, NSV 05515, 4 Crv, HR 4662, HD 106625, SAO 157176, FK5: 457 |
constellation | Corvus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
note (category: star names): | Gienah Ghurab; Gienah, a name also applied to HR 7949. |
position, motion, parallax:
position (J2000) | RA: 12h 15min 48,4sec | DEC: -17° 32' 31'' |
position (J1900) | RA: 12h 10min 39,7sec | DEC: -16° 59' 12'' |
proper motion (J2000) | RA: -0,161 arcsec/a | DEC: 0,023 arcsec/a |
radial velocity | -4 km/s note: spectroscopic binaries |
|
rotational velocity | 41 km/s (uncertain) (variable) |
magnitude
visual magnitude | 2,59 (V on UBV Johnson system) |
spectral / color information
spectral class | B8IIIpHgMn |
B-V-magnitude | -0,11 |
U-B-magnitude | -0,34 |
R-I-magnitude | -0,09 |
variability information
variable star identification | 5515 |
note (category: variability): | Expanding circumstellar shell. |
miscellaneous information
note (category: group membership): | Hyades group; probable blue straggler. |
note (category: stellar radii or diameters): | Diam. = 0.00072 - 0.00075". |
note (category: miscellaneous): | Old disk population runaway star. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
position (J2000) | RA: 12h 15min 48,366sec | DEC: -17° 32' 30,97'' | ±0,06 arcsec | source: 15 |
proper motion (J2000) | RA: -0,0112 arcsec/a | DEC: 0,023 arcsec/a | source: 25 | |
radial velocity | -4 km/s | source: 25 | ||
galactic coord. (B1950) | longitude: 291° | latitude: 44,5° | ||
GCI unit vector (J2000) | X: -0,95123 | Y: -0,065708 | Z: -0,301404 |
magnitude:
visual | 2,59 (observed) | source: 25 |
photovisual | 2,8 | source: 2 |
photographic | 2,7 | source: 2 |
spectral information:
spectral class | B8 | source: 96 | |
Morgan-Keenan | B8IIIpHgMn | source: 25 | |
B-magnitude | 2,48 ±0,05 | B-V-magnitude | -0,11 |
U-magnitude | 2,14 ±0,05 | U-B-magnitude | -0,34 |
variability information:
variability type | 9 |
var. amplitude | 0,04 |
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: 12h 13min 13,843sec | DEC: -17° 15' 51,84'' | ±0,005 arcsec |
position (J2000) | RA: 12h 15min 48,371sec | DEC: -17° 32' 30,99'' | |
proper motion J1950 (FK4) | RA: -0,0114 arcsec/a | DEC: 0,018 arcsec/a | ±0,001 arcsec/a in RA ±0,001 arcsec/a in DEC |
proper motion J2000 (FK5) | RA: -0,0112 arcsec/a | DEC: 0,023 arcsec/a | |
source of proper motion data | Determined by source catalog |
magnitude:
visual | 2,8 (accuracy: 2 decimals) |
source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
spectral class | B8 |
source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
source catalogue | FK4, catalogue number: 457 |
Durchmusterung | BD-16 3424 |
Boss General Catalogue | 16740 |
Henry Draper Catalogue | 106625 |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
position (J1950) | RA: 12h 13min 13,8sec | DEC: -17° 15' 52'' |
variability informations:
magnitute at max. brightness | 2,56 |
magnitute at min. brightness | 2,6 |
photometric system | visual, photovisual or Johnson's V |
spectral information
spectral class | B8 |
references
to a study | 290477D (designation: ZI 921) |
miscanellous
There are notes in the published catalog (Kukarkin et al.(1982)). |