18 Orionis
| catalogues and names |
| The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) |
| SKY2000 - Master Star Catalog |
| Smithsonian Astrophysical Observatory Star Catalog |
catalogues and names
| catalogues and names | 18 Ori, HR 1718, HD 34203, SAO 94426, BD +11 756, FK5: 2395 |
| constellation | Orion |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 5h 16min 4.1sec | DEC: +11° 20' 29'' | ||
| position (B1900) | RA: 5h 10min 30.7sec | DEC: +11° 13' 44'' | ||
| proper motion (J2000) | RA: -0.009 arcsec/a | DEC: -0.005 arcsec/a | ||
| radial velocity | -8 km/s | |||
| rotational velocity | 67 km/s (uncertain) (variable) | |||
| galactic coordinates | longitude: 191.3° | latitude: -15.25° | ||
magnitude
| visual magnitude | 5.56 (V on UBV Johnson system) |
spectral / color information
| spectral class | A0V |
| B-V-magnitude | -0.04 |
| U-B-magnitude | -0.05 |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 5h 16min 4.13sec | DEC: +11° 20' 28.95'' | ±0.22 arcsec | source: 15 |
| proper motion (J2000) | RA: -0.0006 arcsec/a | DEC: -0.005 arcsec/a | source: 25 | |
| radial velocity | -8 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 191.3° | latitude: -15.25° | ||
magnitude:
| visual | 5.56 (observed) | source: 25 |
| photovisual | 5.5 | source: 2 |
spectral information:
| spectral class | A0 | source: 96 | |
| Morgan-Keenan | A0V | source: 25 | |
| B-magnitude | 5.52 ±0.05 | B-V-magnitude | -0.04 |
| U-magnitude | 5.47 ±0.05 | U-B-magnitude | -0.05 |
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 (B1950) | RA: 5h 13min 17.327sec | DEC: +11° 17' 12.31'' | ±0.022 arcsec |
| position (J2000) | RA: 5h 16min 4.165sec | DEC: +11° 20' 28.71'' | |
| proper motion B1950 (FK4) | RA: -0.0003 arcsec/a | DEC: -0.009 arcsec/a | ±0.004 arcsec/a in RA ±0.004 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0.0002 arcsec/a | DEC: -0.01 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5.5 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | A0 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | GC, catalogue number: 6436 |
| Durchmusterung | BD+11 756 |
| Boss General Catalogue | 6436 |
| Henry Draper Catalogue | 34203 |