s Orionis
catalogues and names
| catalogues and names | s Ori, NSV 16610, 48 Ori, HR 1931, HD 37468, SAO 132406, BD -2 1326, WDS 05387-0236A |
| constellation | Orion |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 5h 38min 44.8sec | DEC: -2° 36' 0'' | ||
| position (B1900) | RA: 5h 33min 43.5sec | DEC: -2° 39' 28'' | ||
| proper motion (J2000) | RA: 0.002 arcsec/a | DEC: 0.001 arcsec/a | ||
| radial velocity | 29 km/s note: spectroscopic binaries |
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| rotational velocity | 94 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0.007 arcsec | |||
| galactic coordinates | longitude: 206.82° | latitude: -17.34° | ||
| note (category: dynamical parallaxes): | 0.003". |
magnitude
| visual magnitude | 3.81 (V on UBV Johnson system) |
spectral / color information
| spectral class | O9.5V |
| B-V-magnitude | -0.24 |
| U-B-magnitude | -1.01 |
| R-I-magnitude |
| note (category: spectra): | Hydrogen deficient. Interstellar Lyman alpha absorption observed by AEROBEE rocket. |
double/multiple star system information
| number of components of multiple star system | 5 |
| separation | 0.2 arcsec |
| mag difference (of double or brightest multiple) | 0.8 |
| component ID | AB |
| note (category: double and multiple data): | AB 4.1 O9.5V, 5.1 B0.5V, 170y, a = 0.247". Combined mag. and colors. C, 8.79V, A2V at 11" may be physical; D, 6.62V, -0.20(B-V), B2V, at 13" and E = HR 1932, at 42" CPM with A. A multiple system similar to trapezium. ADS 4241 possibly the most massive visual binary known, 35 solar masses. |
miscellaneous information
| note (category: group membership): | Ori OB1b1; Orion belt; HII reg.; IC 434; a trapezium system. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 5h 38min 44.778sec | DEC: -2° 36' 0.34'' | ±0.35 arcsec | source: 17 |
| proper motion (J2000) | RA: 0.0003 arcsec/a | DEC: -0.001 arcsec/a | source: 25 | |
| radial velocity | 29 km/s | source: 25 | ||
| trigonometric parallax | 0.007 arcsec | ±0.001 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 206.82° | latitude: -17.34° | ||
magnitude:
| visual | 3.81 (observed) | source: 25 |
| photovisual | 3.8 | source: 2 |
| photographic | 3.5 | source: 2 |
spectral information:
| spectral class | B0 | source: 96 | |
| Morgan-Keenan | O9.5V | source: 25 | |
| B-magnitude | 3.57 ±0.05 | B-V-magnitude | -0.24 |
| U-magnitude | 2.56 ±0.05 | U-B-magnitude | -1.01 |
double/multiple star system information:
| separation between brightest and second brightest component | 0.3 arcsec |
| magnitude difference between brightest and second brightest component | 2 |
| position angle | 125 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 3.81 | B0 | s Orionis, 48 Ori, HR 1931, HD 37468, SAO 132406 |
| B | 6.6 | B3 | HR 1932, HD 37479, SAO 132408 |
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 | |
| 17 | ACRS |
| Corbin, T.E., and S.E. Urban, Astrographic Catalog Reference Stars, United States Naval Observatory, 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 (B1950) | RA: 5h 36min 14.048sec | DEC: -2° 37' 38.49'' | ±0.01 arcsec |
| position (J2000) | RA: 5h 38min 44.76sec | DEC: -2° 36' 0.15'' | |
| proper motion B1950 (FK4) | RA: -0.0002 arcsec/a | DEC: 0.001 arcsec/a | ±0.002 arcsec/a in RA ±0.002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0001 arcsec/a | DEC: 0.001 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 3.8 (accuracy: 2 decimals) |
| source of visual magnitude data | Combined magnitude of component stars. |
spectral information:
| spectral class | B0 |
| source of spectral data | Taken from the HD with M stars reclassified by Miss Cannon. |
remarks for duplicity and variability
| Double star - see source catalog for source |
catalogues
| source catalogue | FK3, catalogue number: 213 |
| Durchmusterung | BD-02 1326 |
| Boss General Catalogue | 7031 |
| Henry Draper Catalogue | 37468 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 5h 38.7min | DEC: -2° 36' |
| proper motion (J2000) | RA: 0.005 arcsec/a | DEC: -0.001 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 | 1888 | 76 | 358° | 0.2'' | 4 | 6 | O9.5V | BU 1032 |
| 1994 | 125° | 0.3'' | ||||||
| AB-C | 1831 | 30 | 236° | 11'' | 3.73 | 8.79 | - | STF 762 |
| 1973 | 238° | 11.4'' | ||||||
| AB-D | 1831 | 36 | 84° | 12.9'' | 3.73 | 6.66 | - | STF 762 |
| AB-E | 1831 | 27 | 61° | 41.6'' | 3.73 | 6.72 | B2V | STF 762 |
| DC | 1868 | 4 | 251° | 24'' | - | - | - | STF 762 |
| EC | 1868 | 1 | 240° | 53.8'' | - | - | - | STF 762 |
| ED | 1831 | 9 | 231° | 30.1'' | 6.66 | 7.9 | B2Vp | STF 762 |
discoverer information:
| discoverer code | discoverer | reference |
| BU 1032 | Burnham, S.W. | - |
| STF 762 | Struve, F.G.W. | - |
notes:
| note | Sigma Ori. P = 155.3yr., a = 0.264", motion retrograde. A is variable, V1030 Ori. This is a trapezium system with at least five components, including the helium- rich star E , BD-02@1327. A has also been reported to be a short period, double-lined spectroscopic binary. |
data from 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)
position:
| position (B1900) | RA: 5h 33.7min | DEC: -2° 39' |
magnitudes, spectral classes, orbital elements:
| author: | W.D. Heintz |
| date of observation: | 1972 |
| magnitude of component A: | 4.2 |
| magnitude of component B: | 4.2 |
| spectral class component B: | O9.5V |
| spectral class component B: | O9.5V |
| period [y]: | 170 |
| semi-major axis [arcsec]: | 0.247 |
| inclination [deg]: | 165 |
| node [deg]: | 124.5 |
| equinox of node: | 2000 |
| eccentricity: | 0.07 |
| time of periastron passage: | 1970 |
| dates of ephemeris: | 1974-1992 |
| grade: | reliable |
| reference: | Astron. J. 79; 397; 1974. |
| notes | Brightest pair in a trapezium system (STF 762) which includes the components C (mag. 8.79, 11", A2V), D (mag. 6.62, 13", B2V), and the helium-rich star E (mag. 6.5, 42", B1Vp). Heintz gives formulae for the motions AB-C and AB-D. |
| other name(s) | BU 1032, Sigma Ori |