Al Nair
| catalogues and names | Al Nair, a Gru, NSV 14040, HR 8425, HD 209952, SAO 230992, FK5: 829, WDS 22082-4658 |
| other names | Alnair |
| constellation | Grus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
| note (category: star names): | ALNAIR; Al Nair. |
position, motion, parallax:
| position (J2000) | RA: 22h 8min 14sec | DEC: -46° 57' 40'' |
| position (J1900) | RA: 22h 1min 55,9sec | DEC: -47° 26' 43'' |
| proper motion (J2000) | RA: 0,129 arcsec/a | DEC: -0,151 arcsec/a |
| radial velocity | 12 km/s | |
| rotational velocity | 236 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,057 arcsec | |
magnitude
| visual magnitude | 1,74 (V on UBV Johnson system) |
spectral / color information
| spectral class | B7IV |
| B-V-magnitude | -0,13 |
| U-B-magnitude | -0,47 |
| R-I-magnitude | -0,09 |
| note (category: spectra): | C1 neutral carbon continuum shows discontinuities in UV. COPERNICUS spectra revealed MgII emission. |
| note (category: colors): | Color excess E(B-V) = -0.02. |
variability information
| variable star identification | 14040 |
double/multiple star system information
| separation | 28,4 arcsec |
| mag difference (of double or brightest multiple) | 10,1 |
| note | Worley (1978) update of the IDS |
miscellaneous information
| note (category: group membership): | Member of Pleiades group. |
| note (category: stellar radii or diameters): | Diam. = 0.00098 - 0.00102". |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 22h 8min 14sec | DEC: -46° 57' 39,59'' | ±0,06 arcsec | source: 15 |
| proper motion (J2000) | RA: 0,0126 arcsec/a | DEC: -0,151 arcsec/a | source: 25 | |
| radial velocity | 12 km/s | source: 25 | ||
| trigonometric parallax | 0,057 | ±0,006 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 350,01° | latitude: -52,47° | ||
| GCI unit vector (J2000) | X: 0,602934 | Y: -0,319799 | Z: -0,730889 | |
magnitude:
| visual | 1,74 (observed) | source: 25 |
| photovisual | 2,2 | source: 2 |
| photographic | 2 | source: 2 |
spectral information:
| spectral class | B5 | source: 96 | |
| Morgan-Keenan | B7IV | source: 25 | |
| B-magnitude | 1,61 ±0,05 | B-V-magnitude | -0,13 |
| U-magnitude | 1,14 ±0,05 | U-B-magnitude | -0,47 |
variability information:
| variability type | 9 |
| var. amplitude | 0,06 |
double/multiple star system information:
| separation between brightest and second brightest component | 28,4 arcsec |
| magnitude difference between brightest and second brightest component | 10,6 |
| position angle | 149 ° |
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: 22h 5min 5,486sec | DEC: -47° 12' 14,54'' | ±0,01 arcsec |
| position (J2000) | RA: 22h 8min 14,012sec | DEC: -46° 57' 39,8'' | |
| proper motion J1950 (FK4) | RA: 0,0128 arcsec/a | DEC: -0,149 arcsec/a | ±0,002 arcsec/a in RA ±0,002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,0128 arcsec/a | DEC: -0,153 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 | B5 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | FK4, catalogue number: 829 |
| Durchmusterung | CD-4714063 |
| Boss General Catalogue | 30942 |
| Henry Draper Catalogue | 209952 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 22h 8,2min | DEC: -46° 58' |
| proper motion (J2000) | RA: 0,129 arcsec/a | DEC: -0,151 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 |
| - | 1947 | 1 | 149° | 28,4'' | 1,74 | 12,3 | B7IV | RST5483 |
discoverer information:
| discoverer code | discoverer | reference |
| RST5483 | Rossiter, R.A. | - |
notes:
| note | Not seen by Holden on four nights 1963-1969. |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
| position (J1950) | RA: 22h 5min 5,5sec | DEC: -47° 12' 15'' |
variability informations:
| magnitute at max. brightness | 1,7 |
| magnitute at min. brightness | 1,76 |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | B5 |
references
| to a study | 572444D (designation: ALPHA GRU) |
miscanellous
| There are notes in the published catalog (Kukarkin et al.(1982)). |