y1Orionis
catalogues and names
| catalogues and names | y1Ori, V1086 Ori, 25 Ori, HR 1789, HD 35439, SAO 112734, BD +1 1005, FK5: 2406 |
| constellation | Orion |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 5h 24min 44.8sec | DEC: +1° 50' 47'' | ||
| position (B1900) | RA: 5h 19min 33.3sec | DEC: +1° 45' 17'' | ||
| proper motion (J2000) | RA: 0.001 arcsec/a | DEC: 0.001 arcsec/a | ||
| radial velocity | 19 km/s note: variable radial velocity |
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| rotational velocity | 316 km/s (uncertain) (variable) | |||
| galactic coordinates | longitude: 200.96° | latitude: -18.29° | ||
| note (category: radial and/or rotational velocities): | Period 3-5y? Expanding circumstellar shell. |
magnitude
| visual magnitude | 4.95 (V on UBV Johnson system) |
spectral / color information
| spectral class | B1Vpe |
| B-V-magnitude | -0.2 |
| U-B-magnitude | -0.92 |
| R-I-magnitude |
| note (category: spectra): | Shell star. Also classified B3ne, BeIII-IV. |
variability information
| variable star identification | V1086 Ori |
| note (category: variability): | Gamma Cas?, 4.92 - 4.96V, 14.50d? Amp. 0.07R, 0.06(R-I). |
miscellaneous information
| note (category: group membership): | Ori OB1a. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 5h 24min 44.819sec | DEC: +1° 50' 47.01'' | ±0.43 arcsec | source: 16 |
| proper motion (J2000) | RA: -0.0002 arcsec/a | DEC: -0.005 arcsec/a | source: 25 | |
| radial velocity | 19 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 200.96° | latitude: -18.29° | ||
magnitude:
| visual | 4.95 (observed) | source: 25 |
| photovisual | 4.7 | source: 2 |
| photographic | 4.5 | source: 16 |
spectral information:
| spectral class | B3 | source: 96 | |
| Morgan-Keenan | B1Vpe | source: 25 | |
| B-magnitude | 4.75 ±0.05 | B-V-magnitude | -0.2 |
| U-magnitude | 3.83 ±0.05 | U-B-magnitude | -0.92 |
variability information:
| variability type | 264 |
| var. amplitude | 0 |
double/multiple star system information:
| separation between brightest and second brightest component | 157.9 arcsec |
| position angle | 216 ° |
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 | |
| 16 | PPM North and PPM South Catalogs and PPM Supplement |
| Roser, S., and U. Bastian, "Catalogue of Positions and Proper Motions," A&AS, Vol. 74, p. 449, 1988, and Bastian, U., et al., "Catalogue of Positions and Proper Motions - South," 1993 | |
| 18 | Hipparcos Input Catalog Version 2 Annex |
| Turon, C., et al., "The Hipparcos Input Catalog, Version 2," Centre de Donnees Stellaires Information Bulletin, Vol. 43, p. 5, 1993 | |
| 25 | Bright Star Catalogue, 5th edition |
| Hoffleit, D. and Warren, W.H. Jr., The Bright Star Catalogue, 5th Revised Edition, Version 2, 1994 | |
| 27 | Catalog of Red Magnitudes (CRM) |
| Warren, W.H. Jr., Northern Hemisphere Catalog of Red Magnitudes, 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 22min 8.98sec | DEC: +1° 48' 7.84'' | ±0.016 arcsec |
| position (J2000) | RA: 5h 24min 44.821sec | DEC: +1° 50' 46.97'' | |
| proper motion B1950 (FK4) | RA: -0.0003 arcsec/a | DEC: 0 arcsec/a | ±0.004 arcsec/a in RA ±0.003 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0 arcsec/a | DEC: -0.001 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4.7 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | B3p |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | GC, catalogue number: 6660 |
| Durchmusterung | BD+01 1005 |
| Boss General Catalogue | 6660 |
| Henry Draper Catalogue | 35439 |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 5h 22min 9sec | DEC: +1° 48' 8'' |
variability informations:
| variability type | GCAS | eruptive variable star |
| magnitute at max. brightness | 4.92 | |
| magnitute at min. brightness | 4.96 | |
| photometric system | visual, photovisual or Johnson's V |
references
| to a study | J.Papousek, Brno Univ Contr No.20,1979. |
| to a chart/photograph | W.H.Warren, J.E.Hesser, ApJ Suppl 34,115,1977. |
miscanellous
| ID in the GCVS catalogue | 60/1086 |
| constellation | Orion |
| notes on existence | The star is equivalent to '67108'. |
variability type description
| variability type | description |
| GCAS | Eruptive irregular variables of the Gamma Cas type. These are rapidly rotating B III-IVe stars with mass outflow from their equatorial zones. The formation of equatorial rings or disks is often accompanied by temporary fading. Light amplitudes may reach 1.5 mag in V. |