2 Scorpii
catalogues and names
| catalogues and names | 2 Sco, HR 5904, HD 142114, SAO 183896, CD -24 12352, WDS 15536-2520 |
| constellation | Scorpius |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 15h 53min 36.7sec | DEC: -25° 19' 38'' | ||
| position (B1900) | RA: 15h 47min 36.3sec | DEC: -25° 1' 43'' | ||
| proper motion (J2000) | RA: -0.016 arcsec/a | DEC: -0.025 arcsec/a | ||
| radial velocity | -10 km/s | |||
| rotational velocity | 308 km/s (uncertain) (variable) | |||
| dynamical parallax | 0.006 arcsec | |||
| galactic coordinates | longitude: 346.88° | latitude: 21.61° | ||
| note (category: radial and/or rotational velocities): | Rapidly rotating star which may become Be star. |
magnitude
| visual magnitude | 4.59 (V on UBV Johnson system) |
spectral / color information
| spectral class | B2.5Vn |
| B-V-magnitude | -0.07 |
| U-B-magnitude | -0.65 |
| R-I-magnitude |
double/multiple star system information
| separation | 2.3 arcsec |
| mag difference (of double or brightest multiple) | 2.5 |
| note (category: double and multiple data): | CPM. Combined mag., color. |
miscellaneous information
| note (category: group membership): | Sco OB2; Sco-Cen assoc.; probable member of Sco-Cen cluster; upper Sco region; embedded in reflection nebulosity. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 15h 53min 36.704sec | DEC: -25° 19' 38.16'' | ±0.19 arcsec | source: 16 |
| proper motion (J2000) | RA: -0.0014 arcsec/a | DEC: -0.034 arcsec/a | source: 25 | |
| radial velocity | -10 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 346.88° | latitude: 21.61° | ||
magnitude:
| visual | 4.59 (observed) | source: 25 |
| photovisual | 4.1 | source: 16 |
| photographic | 4.5 | source: 2 |
spectral information:
| spectral class | B3 | source: 96 | |
| Morgan-Keenan | B2.5Vn | source: 25 | |
| B-magnitude | 4.52 ±0.05 | B-V-magnitude | -0.07 |
| U-magnitude | 3.87 ±0.05 | U-B-magnitude | -0.65 |
double/multiple star system information:
| separation between brightest and second brightest component | 2.2 arcsec |
| magnitude difference between brightest and second brightest component | 2.7 |
| position angle | 272 ° |
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 | |
| 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: 15h 50min 36.264sec | DEC: -25° 10' 45.87'' | ±0.018 arcsec |
| position (J2000) | RA: 15h 53min 36.719sec | DEC: -25° 19' 37.91'' | |
| proper motion B1950 (FK4) | RA: -0.0011 arcsec/a | DEC: -0.028 arcsec/a | ±0.003 arcsec/a in RA ±0.003 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0.0012 arcsec/a | DEC: -0.025 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 | B3 |
| 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: 21329 |
| Durchmusterung | CD-2412352 |
| Boss General Catalogue | 21329 |
| Henry Draper Catalogue | 142114 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 15h 53.6min | DEC: -25° 20' |
| proper motion (J2000) | RA: -0.016 arcsec/a | DEC: -0.022 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 |
| - | 1855 | 25 | 278° | 2.5'' | 4.7 | 7.4 | B2.5Vn | BU 36 |
| 1980 | 272° | 2.2'' |
discoverer information:
| discoverer code | discoverer | reference |
| BU 36 | Burnham, S.W. | - |
notes:
| note | 2 Sco. |