Alchiba
| catalogues and names | Alchiba, a Crv, 1 Crv, HR 4623, HD 105452, SAO 180505 |
| other names | Alchita, Al Minliar al Ghurab, Al Chiba |
| constellation | Corvus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
| note (category: star names): | Alchiba; Alchita; Al Minliar al Ghurab; Al Chiba. |
position, motion, parallax:
| position (J2000) | RA: 12h 8min 24,8sec | DEC: -24° 43' 44'' |
| position (J1900) | RA: 12h 3min 15,2sec | DEC: -24° 10' 16'' |
| proper motion (J2000) | RA: 0,086 arcsec/a | DEC: -0,04 arcsec/a |
| radial velocity | 4 km/s note: variable radial velocity |
|
| rotational velocity | 16 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,07 arcsec | |
magnitude
| visual magnitude | 4,02 (V on UBV Johnson system) |
spectral / color information
| spectral class | F2III-IV |
| B-V-magnitude | 0,32 |
| U-B-magnitude | -0,02 |
| R-I-magnitude | 0,18 |
| note (category: spectra): | Metal-deficient. |
miscellaneous information
| note (category: group membership): | Sirius group? UMa stream. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 12h 8min 24,806sec | DEC: -24° 43' 43,87'' | ±0,19 arcsec | source: 16 |
| proper motion (J2000) | RA: 0,0068 arcsec/a | DEC: -0,039 arcsec/a | source: 25 | |
| radial velocity | 4 km/s | source: 25 | ||
| trigonometric parallax | 0,07 | ±0,007 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 290,67° | latitude: 37,12° | ||
| GCI unit vector (J2000) | X: -0,907686 | Y: -0,033337 | Z: -0,418325 | |
magnitude:
| visual | 4,02 (observed) | source: 25 |
| photovisual | 4,2 | source: 2 |
| photographic | 4,5 | source: 2 |
spectral information:
| spectral class | F2 | source: 96 | |
| Morgan-Keenan | F2III-IV | source: 25 | |
| B-magnitude | 4,34 ±0,05 | B-V-magnitude | 0,32 |
| U-magnitude | 4,32 ±0,05 | U-B-magnitude | -0,02 |
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 | |
| 16 | PPM North and PPM South Catalogs and PPM Supplement |
| Roser, S., and U. Bastian, "Catalogue of Positions and Proper Motions," A&AS, Vol. 74, p. 449, 1988, and Bastian, U., et al., "Catalogue of Positions and Proper Motions - South," 1993 | |
| 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 5min 49,746sec | DEC: -24° 27' 0,13'' | ±0,014 arcsec |
| position (J2000) | RA: 12h 8min 24,767sec | DEC: -24° 43' 44,05'' | |
| proper motion J1950 (FK4) | RA: 0,0062 arcsec/a | DEC: -0,045 arcsec/a | ±0,002 arcsec/a in RA ±0,003 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,0063 arcsec/a | DEC: -0,04 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4,2 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | F2 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | GC, catalogue number: 16586 |
| Durchmusterung | CD-2410174 |
| Boss General Catalogue | 16586 |
| Henry Draper Catalogue | 105452 |