m Draconis
| catalogues and names | m Dra, 21 Dra, HR 6369, HD 154905, SAO 30239, WDS 17053+5428A |
| constellation | Draco |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 17h 5min 19,8sec | DEC: +54° 28' 13'' |
| position (J1900) | RA: 17h 3min 15,3sec | DEC: +54° 36' 7'' |
| proper motion (J2000) | RA: -0,073 arcsec/a | DEC: 0,085 arcsec/a |
| radial velocity | -18 km/s | |
| rotational velocity | 23 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,046 arcsec | |
| note (category: dynamical parallaxes): | 0.039". |
magnitude
| visual magnitude | 5,83 (original HR magnitude) |
spectral / color information
| spectral class | F7V |
| note (category: spectra): | Combined with HR 6370. |
double/multiple star system information
| number of components of multiple star system | 3 |
| separation | 2 arcsec |
| mag difference (of double or brightest multiple) | 0,1 |
| component ID | AB |
| note (category: double and multiple data): | Binary with HR 6370, q.v., B* 3.2y, a = 0.026"; or 7.4y, a = 0.013", 0.2 solar mass. (Some uncertainty if unseen astrometric companion is A* or B*.) |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 17h 5min 20,166sec | DEC: +54° 28' 13,22'' | ±0,2 arcsec | source: 52 |
| proper motion (J2000) | RA: -0,0086 arcsec/a | DEC: 0,089 arcsec/a | source: 25 | |
| radial velocity | -18 km/s | source: 25 | ||
| trigonometric parallax | 0,046 | ±0,005 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 82,3° | latitude: 37,02° | ||
| GCI unit vector (J2000) | X: -0,137297 | Y: -0,564672 | Z: 0,813815 | |
magnitude:
| visual | 5,7 (observed) | source: 25 |
| photovisual | 5,8 | source: 2 |
| photographic | 6,2 | source: 16 |
spectral information:
| spectral class | F5 | source: 29 | |
| Morgan-Keenan | F7V | source: 25 | |
| B-magnitude | 5,402 ±0,05 | B-V-magnitude | 0,484 |
double/multiple star system information:
| separation between brightest and second brightest component | 2,2 arcsec |
| magnitude difference between brightest and second brightest component | 0 |
| position angle | 29 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 5,65 | - | Arrakis, m Draconis, 21 Dra, HR 6370, HD 154906, SAO 30239 |
| B | 5,7 | F5 | m Draconis, 21 Dra, HR 6369, HD 154905, SAO 30239 |
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 | |
| 29 | SAOJ2000 |
| SAO on FK5 at J2000, 1989 | |
| 52 | PPMN-HP subset |
| PPMN Star Catalogue (Reference 16) High-Precision Subset (Code H) | |
data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)
position and proper motion:
| position (J1950) | RA: 17h 4min 17,357sec | DEC: +54° 32' 7,95'' | ±0,018 arcsec |
| position (J2000) | RA: 17h 5min 19,757sec | DEC: +54° 28' 13,33'' | |
| proper motion J1950 (FK4) | RA: -0,0091 arcsec/a | DEC: 0,084 arcsec/a | ±0,003 arcsec/a in RA ±0,002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0,0084 arcsec/a | DEC: 0,085 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5,1 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | F5 |
| 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: 23092 |
| Durchmusterung | BD+54 1857 |
| Boss General Catalogue | 23092 |
| Henry Draper Catalogue | 154905 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: 17h 5,3min | DEC: +54° 28' |
| proper motion (J2000) | RA: -0,11 arcsec/a | DEC: 0,067 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 | 1819 | often | 211° | 4,3'' | 5,8 | 5,8 | F7V | STF2130 |
| 1993 | 29° | 2,2'' | ||||||
| AC | 1925 | 3 | 179° | 13,8'' | 5,8 | 13,8 | - | BU 1088 |
| 1958 | 175° | 13,2'' | ||||||
| BC | 1889 | 11 | 191° | 12,3'' | 5,8 | 13,7 | - | BU 1088 |
| 1958 | 186° | 13,6'' |
discoverer information:
| discoverer code | discoverer | reference |
| STF2130 | Struve, F.G.W. | - |
| BU 1088 | Burnham, S.W. | - |
notes:
| note | Mu Dra. P = 672yr., a = 3.94", motion retrograde. C is physical. AC: Mt. Wilson spectral types F5s. |