m2Bootis
| catalogues and names | m2Boo, 51 Boo, HR 5734, HD 137392, SAO 64687, WDS 15245+3723B |
| constellation | Bootes |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 15h 24min 30,9sec | DEC: +37° 20' 52'' |
| position (J1900) | RA: 15h 20min 44,1sec | DEC: +37° 41' 53'' |
| proper motion (J2000) | RA: -0,144 arcsec/a | DEC: 0,094 arcsec/a |
| radial velocity | -9 km/s note: suspected variable radial velocity |
|
| rotational velocity | =<25 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,039 arcsec | |
| note (category: dynamical parallaxes): | 0.028". |
magnitude
| visual magnitude | 6,5 (V on UBV Johnson system) |
spectral / color information
| spectral class | G1V |
| B-V-magnitude | 0,59 |
| U-B-magnitude | 0,13 |
double/multiple star system information
| number of components of multiple star system | 3 |
| separation | 108,9 arcsec |
| mag difference (of double or brightest multiple) | 2,2 |
| component ID | AxBC |
| note (category: double and multiple data): | BC 6.98 dG5, 7.63, 260.10y, a = 1.463". Combined mag., colors of BC. Mean mass BC, 0.52 solar. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 15h 24min 30,89sec | DEC: +37° 20' 51,25'' | ±0,2 arcsec | source: 52 |
| proper motion (J2000) | RA: -0,0118 arcsec/a | DEC: 0,094 arcsec/a | source: 25 | |
| radial velocity | -9 km/s | source: 25 | ||
| trigonometric parallax | 0,039 | ±0,004 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 60,33° | latitude: 56,31° | ||
| GCI unit vector (J2000) | X: -0,498902 | Y: -0,61893 | Z: 0,606649 | |
magnitude:
| visual | 6,5 (observed) | source: 25 |
| photovisual | 6,7 | source: 2 |
| photographic | 7 | source: 16 |
spectral information:
| spectral class | K0 | source: 96 | |
| Morgan-Keenan | G1V | source: 25 | |
| B-magnitude | 7,09 ±0,05 | B-V-magnitude | 0,59 |
| U-magnitude | 7,22 ±0,05 | U-B-magnitude | 0,13 |
double/multiple star system information:
| separation between brightest and second brightest component | 2,1 arcsec |
| magnitude difference between brightest and second brightest component | 0,6 |
| position angle | 10 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 4,31 | F0 | Alkalurops, m1Bootis, 51 Boo, HR 5733, HD 137391, SAO 64686 |
| B | 6,5 | K0 | m2Bootis, 51 Boo, HR 5734, HD 137392, SAO 64687 |
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 | |
| 52 | PPMN-HP subset |
| PPMN Star Catalogue (Reference 16) High-Precision Subset (Code H) | |
| 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: 15h 22min 37,402sec | DEC: +37° 31' 18,89'' | ±0,022 arcsec |
| position (J2000) | RA: 15h 24min 30,891sec | DEC: +37° 20' 51,59'' | |
| proper motion J1950 (FK4) | RA: -0,0124 arcsec/a | DEC: 0,091 arcsec/a | ±0,004 arcsec/a in RA ±0,003 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0,0121 arcsec/a | DEC: 0,094 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 6,7 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | K0 |
| 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: 20725 |
| Durchmusterung | BD+37 2637 |
| Boss General Catalogue | 20725 |
| Henry Draper Catalogue | 137392 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 15h 24,5min | DEC: +37° 23' |
| proper motion (J2000) | RA: -0,146 arcsec/a | DEC: 0,087 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 |
| Aa | 1988 | 2 | 350° | 0,1'' | 4,31 | - | F2IVa | CHR 181 |
| 1993 | 280° | - | ||||||
| Aa-BC | 1834 | 54 | 171° | 108,4'' | 4,31 | 6,5 | F2IVa G0V | STF 28 |
| BC | 1826 | often | 327° | 1,3'' | 7,2 | 7,8 | G0V | STF1938 |
| 1994 | 10° | 2,1'' |
discoverer information:
| discoverer code | discoverer | reference |
| CHR 181 | - | - |
| STF 28 | Struve, F.G.W. | - |
| STF1938 | Struve, F.G.W. | - |
notes:
| note | Mu (1) Boo. A is a long-period spectroscopic binary. BC: Mu (2) Boo. P = 246yr., a = 1.40", motion retrograde. |