additional / editable data
| entry 1 (3/25/00,10:02:31 PM) |
 |
z Orionis
catalogues and names
| catalogues and names | z Ori, 50 Ori, HR 1949, HD 37743, WDS 05407-0157B |
| constellation | Orion |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 5h 40min 45.6sec | DEC: -1° 56' 34'' | ||
| position (2000.73) | RA: 5h 40min 48sec | DEC: -1° 56' 33'' | ||
| position (B1900) | RA: 5h 35min 42.7sec | DEC: -1° 59' 43'' | ||
| proper motion (J2000) | RA: 0.004 arcsec/a | DEC: -0.002 arcsec/a | ||
| radial velocity | 13 km/s note: spectroscopic binaries |
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| trigonometric parallax | 0.024 arcsec | |||
| galactic coordinates | longitude: 206.45° | latitude: -16.59° | ||
| note (category: dynamical parallaxes): | 0.004". |
magnitude
| visual magnitude | 4.21 (original HR magnitude) |
spectral / color information
| spectral class | B0III |
| IR-note | object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978) |
| note (category: spectra): | Interstellar Lyman alpha absorption observed by AEROBEE rocket. |
variability information
| variable star identification | 2553 |
double/multiple star system information
| number of components of multiple star system | 3 |
| separation | 2.4 arcsec |
| mag difference (of double or brightest multiple) | 2.2 |
| component ID | AB |
| note (category: double and multiple data): | See HR 1948. |
miscellaneous information
| note (category: group membership): | Ori OB1; Orion belt; HII region; IC 434. |
| note (category: miscellaneous): | In line of sight of high-velocity interstellar cloud. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 5h 40min 45.564sec | DEC: -1° 56' 35.98'' | ±0.5 arcsec | source: 25 |
| position (2000.73) | RA: 5h 40min 48sec | DEC: -1° 56' 35'' | JD: 2451810.12 | |
| proper motion (J2000) | RA: 0.0002 arcsec/a | DEC: -0.002 arcsec/a | source: 25 | |
| radial velocity | 13 km/s | source: 25 | ||
| trigonometric parallax | 0.024 arcsec | ±0.002 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 206.46° | latitude: -16.59° | ||
magnitude:
| visual | 4.21 (observed) | source: 25 |
| photovisual | 4.2 | source: 2 |
| photographic | 4 | source: 2 |
spectral information:
| Morgan-Keenan | B0III | source: 25 | |
| B-magnitude | 4 ±0.004 | B-V-magnitude | -0.21 |
| U-magnitude | 2.94 ±0.002 | U-B-magnitude | -1.06 |
double/multiple star system information:
| separation between brightest and second brightest component | 2.3 arcsec |
| magnitude difference between brightest and second brightest component | 2.2 |
| position angle | 166 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 2.03 | B0 | Alnitak, z Orionis, 50 Ori, HR 1948, HD 37742, SAO 132444 |
| B | 4.21 | - | z Orionis, 50 Ori, HR 1949, HD 37743, |
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 | |
| 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 | |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 5h 40.7min | DEC: -1° 57' |
| proper motion (J2000) | RA: 0.001 arcsec/a | DEC: -0.005 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 |
| AB | 1822 | often | 151° | 2.3'' | 2 | 4.2 | O9.5Ibe | STF 774 |
| 1990 | 166° | - | ||||||
| AC | 1880 | 13 | 10° | 57.6'' | 2 | 10 | - | STF 774 |
| BC | 1909 | 1 | 8° | 59.7'' | 4.2 | 8.5 | B0 | STF 774 |
discoverer information:
| discoverer code | discoverer | reference |
| STF 774 | Struve, F.G.W. | - |
notes:
| note | Zeta Ori. A premature orbit has been computed. Variable radial velocity of A not confirmed. C may be physical. Spectral types of AB: O9.5Ibe and B0III. |
data from 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)
position:
| position (B1900) | RA: 5h 35.7min | DEC: -2° 0' |
magnitudes, spectral classes, orbital elements:
| author: | J. Hopmann |
| date of observation: | 1955 |
| magnitude of component A: | 1.88 |
| magnitude of component B: | 1.88 |
| spectral class component B: | O9.5I |
| spectral class component B: | O9.5I |
| period [y]: | 1508.6 |
| semi-major axis [arcsec]: | 2.728 |
| inclination [deg]: | 72 |
| node [deg]: | 155.5 |
| equinox of node: | 1900 |
| eccentricity: | 0.07 |
| time of periastron passage: | 2070.6 |
| dates of ephemeris: | 1950-2000 |
| grade: | indeterminate |
| reference: | Mitt. Sternw. Wien 13, 49; 1967. |
| notes | Suspected RV variation of star A not confirmed. Star C (mag. about 9, 60") may be physical. |
| other name(s) | STF 774, Zeta Ori |
additional / editable data
| entry 1 (3/25/00,10:02:31 PM) |
|