Hamal
| catalogues and names | Hamal, a Ari, NSV 00725, 13 Ari, HR 617, HD 12929, SAO 75151, FK5: 74 |
| other names | Hemal, Hamul, Ras Hammel, Arietis |
| constellation | Aries |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
| note (category: star names): | HAMAL; Hemal; Hamul; Ras Hammel; El Nath (obsolete). The name Arietis also used both for the star and the constellation. |
position, motion, parallax:
| position (J2000) | RA: 2h 7min 10,4sec | DEC: +23° 27' 45'' |
| position (J1900) | RA: 2h 1min 32sec | DEC: +22° 59' 23'' |
| proper motion (J2000) | RA: 0,19 arcsec/a | DEC: -0,148 arcsec/a |
| radial velocity | -14 km/s note: spectroscopic binaries |
|
| rotational velocity | <17 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,049 arcsec | |
magnitude
| visual magnitude | 2 (V on UBV Johnson system) |
spectral / color information
| spectral class | K2-IIICa-1 |
| B-V-magnitude | 1,15 |
| U-B-magnitude | 1,12 |
| R-I-magnitude | 0,62 |
| note (category: spectra): | Also classified K2IIIab Ca-1. |
variability information
| variable star identification | 725 |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 2h 7min 10,403sec | DEC: +23° 27' 44,66'' | ±0,06 arcsec | source: 15 |
| proper motion (J2000) | RA: 0,0138 arcsec/a | DEC: -0,148 arcsec/a | source: 25 | |
| radial velocity | -14 km/s | source: 25 | ||
| trigonometric parallax | 0,049 | ±0,005 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 144,58° | latitude: -36,2° | ||
| GCI unit vector (J2000) | X: 0,779681 | Y: 0,483297 | Z: 0,398147 | |
magnitude:
| visual | 2 (observed) | source: 25 |
| photovisual | 2,2 | source: 2 |
spectral information:
| spectral class | K2 | source: 96 | |
| Morgan-Keenan | K2-IIIabCa-1 | source: 25 | |
| B-magnitude | 3,15 ±0,05 | B-V-magnitude | 1,15 |
| U-magnitude | 4,27 ±0,05 | U-B-magnitude | 1,12 |
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: 2h 4min 20,917sec | DEC: +23° 13' 37,07'' | ±0,003 arcsec |
| position (J2000) | RA: 2h 7min 10,398sec | DEC: +23° 27' 44,61'' | |
| proper motion J1950 (FK4) | RA: 0,0138 arcsec/a | DEC: -0,144 arcsec/a | ±0,001 arcsec/a in RA ±0,001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,0138 arcsec/a | DEC: -0,149 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: 74 |
| Durchmusterung | BD+22 306 |
| Boss General Catalogue | 2538 |
| Henry Draper Catalogue | 12929 |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
| position (J1950) | RA: 2h 4min 20,9sec | DEC: +23° 13' 37'' |
variability informations:
| magnitute at max. brightness | 1,98 |
| magnitute at min. brightness | 2,04 |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | K2 |
references
| to a study | 0807D (designation: ALPHA ARI) |
miscanellous
| There are notes in the published catalog (Kukarkin et al.(1982)). |