Atria
| catalogues and names | Atria, a TrA, HR 6217, HD 150798, SAO 253700, FK5: 625 |
| constellation | Triangulum Australe |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 16h 48min 39,9sec | DEC: -69° 1' 40'' |
| position (J1900) | RA: 16h 38min 4,3sec | DEC: -68° 50' 38'' |
| proper motion (J2000) | RA: 0,014 arcsec/a | DEC: -0,034 arcsec/a |
| radial velocity | -3 km/s | |
| trigonometric parallax | 0,031 arcsec | |
magnitude
| visual magnitude | 1,92 (V on UBV Johnson system) |
spectral / color information
| spectral class | K2IIb-IIIa |
| B-V-magnitude | 1,44 |
| U-B-magnitude | 1,56 |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 16h 48min 39,869sec | DEC: -69° 1' 39,82'' | ±0,06 arcsec | source: 15 |
| proper motion (J2000) | RA: 0,0026 arcsec/a | DEC: -0,034 arcsec/a | source: 25 | |
| radial velocity | -3 km/s | source: 25 | ||
| trigonometric parallax | 0,031 | ±0,003 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 321,54° | latitude: -15,26° | ||
| GCI unit vector (J2000) | X: -0,109615 | Y: -0,340718 | Z: -0,933754 | |
magnitude:
| visual | 1,92 (observed) | source: 25 |
| photovisual | 1,9 | source: 2 |
| photographic | 3 | source: 2 |
spectral information:
| spectral class | K2 | source: 96 | |
| Morgan-Keenan | K2IIb-IIIa | source: 25 | |
| B-magnitude | 3,36 ±0,05 | B-V-magnitude | 1,44 |
| U-magnitude | 4,92 ±0,05 | U-B-magnitude | 1,56 |
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: 16h 43min 21,059sec | DEC: -68° 56' 19,89'' | ±0,008 arcsec |
| position (J2000) | RA: 16h 48min 39,936sec | DEC: -69° 1' 39,56'' | |
| proper motion J1950 (FK4) | RA: 0,0052 arcsec/a | DEC: -0,034 arcsec/a | ±0,002 arcsec/a in RA ±0,002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,0035 arcsec/a | DEC: -0,032 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 1,9 (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: 625 |
| Durchmusterung | CP-68 2822 |
| Boss General Catalogue | 22558 |
| Henry Draper Catalogue | 150798 |