Meissa
| catalogues and names | Meissa, l Ori, NSV 02240, 39 Ori, HR 1879, HD 36861, SAO 112921, WDS 05351+0956A |
| other names | Heka |
| constellation | Orion |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
| note (category: star names): | Meissa; Heka. |
position, motion, parallax:
| position (J2000) | RA: 5h 35min 8,3sec | DEC: +9° 56' 3'' |
| position (J1900) | RA: 5h 29min 37,7sec | DEC: +9° 52' 2'' |
| proper motion (J2000) | RA: 0 arcsec/a | DEC: -0,006 arcsec/a |
| radial velocity | 34 km/s | |
| rotational velocity | 66 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,007 arcsec | |
| note (category: dynamical parallaxes): | 0.001". |
magnitude
| visual magnitude | 3,54 (V on UBV Johnson system) |
spectral / color information
| spectral class | O8III((f)) |
| B-V-magnitude | -0,18 |
| U-B-magnitude | -1,03 |
| R-I-magnitude | -0,17 |
| note (category: colors): | Color excess E(B-V) = +0.12. |
variability information
| variable star identification | 2240 |
| note (category: variability): | Uncertain which of HR 1879 or 1880 is the variable suspect. |
double/multiple star system information
| number of components of multiple star system | 4 |
| separation | 4,4 arcsec |
| mag difference (of double or brightest multiple) | 2 |
| component ID | AB |
| note (category: double and multiple data): | A,B,C fixed. B is HR 1880. Colors for combined light. Blended mag., 3.39V. C is 11.2v at 29", optical; D, 11.2 at 78". |
miscellaneous information
| note (category: group membership): | In cluster Collinder 69; exciting star of HII region S264; in Lambda Ori assoc. Lambda Ori and surroundings are at same distance as Ori OB1 assoc. but are not members. Lambda Ori member surrounded by expanding HII region. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 5h 35min 8,25sec | DEC: +9° 56' 2,6'' | ±0,76 arcsec | source: 18 |
| proper motion (J2000) | RA: -0,0003 arcsec/a | DEC: -0,005 arcsec/a | source: 25 | |
| radial velocity | 34 km/s | source: 25 | ||
| trigonometric parallax | 0,007 | ±0,001 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 195,06° | latitude: -12° | ||
| GCI unit vector (J2000) | X: 0,106647 | Y: 0,979217 | Z: 0,172515 | |
magnitude:
| visual | 3,54 (observed) | source: 25 |
| photovisual | 3,7 | source: 2 |
| photographic | 3,5 | source: 16 |
spectral information:
| spectral class | O0 | source: 96 | |
| Morgan-Keenan | O8III((f)) | source: 25 | |
| B-magnitude | 3,36 ±0,05 | B-V-magnitude | -0,18 |
| U-magnitude | 2,33 ±0,05 | U-B-magnitude | -1,03 |
double/multiple star system information:
| separation between brightest and second brightest component | 4,4 arcsec |
| magnitude difference between brightest and second brightest component | 1,9 |
| position angle | 43 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 3,54 | O0 | Meissa, l Orionis, 39 Ori, HR 1879, HD 36861, SAO 112921 |
| B | 5,61 | - | l Orionis, 39 Ori, HR 1880, HD 36862, |
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 | |
| 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 (J1950) | RA: 5h 32min 22,913sec | DEC: +9° 54' 8,35'' | ±0,022 arcsec |
| position (J2000) | RA: 5h 35min 8,26sec | DEC: +9° 56' 2,56'' | |
| proper motion J1950 (FK4) | RA: -0,0001 arcsec/a | DEC: -0,005 arcsec/a | ±0,003 arcsec/a in RA ±0,003 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0 arcsec/a | DEC: -0,006 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 3,7 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | Oe5 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
remarks for duplicity and variability
| Double star in Aitken's Double Star Catalogue (Aitken 1932) |
catalogues
| source catalogue | GC, catalogue number: 6915 |
| Durchmusterung | BD+09 879 |
| Boss General Catalogue | 6915 |
| Henry Draper Catalogue | 36861 The "SAO Catalog" entry refers to two consecutive HD numbers, the lower of which is given. |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 5h 35,1min | DEC: +9° 56' |
| 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 | 1821 | often | 43° | 4,4'' | 3,7 | 5,6 | O8 B0.5V | STF 738 |
| AC | 1880 | 12 | 184° | 28,6'' | 3,7 | 10,72 | - | STF 738 |
| AD | 1905 | 3 | 271° | 78,3'' | 3,7 | 11,2 | - | STF 738 |
| AE | 1905 | 1 | 278° | 151,8'' | - | - | - | GUI |
discoverer information:
| discoverer code | discoverer | reference |
| STF 738 | Struve, F.G.W. | - |
| GUI | Guillaume, J. |
notes:
| note | Lambda Ori. |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
| position (J1950) | RA: 5h 32min 22,9sec | DEC: +9° 54' 8'' |
variability informations:
| magnitute at max. brightness | 3,38 |
| magnitute at min. brightness | 3,54 |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | O8 |
references
| to a study | 0807D (designation: 101G ORI) |
miscanellous
| There are notes in the published catalog (Kukarkin et al.(1982)). |