39 Draconis
catalogues and names
| catalogues and names | 39 Dra, HR 6923, HD 170073, SAO 30949, BD +58 1809, WDS 18239+5848A |
| constellation | Draco |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 18h 23min 54,5sec | DEC: +58° 48' 2'' | ||
| position (2001,21) | RA: 18h 23min 56sec | DEC: +58° 48' 5'' | ||
| position (B1900) | RA: 18h 22min 26,9sec | DEC: +58° 44' 34'' | ||
| proper motion (J2000) | RA: -0,039 arcsec/a | DEC: 0,06 arcsec/a | ||
| radial velocity | -15 km/s note: spectroscopic binaries |
|||
| rotational velocity | 175 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0,035 arcsec | |||
| galactic coordinates | longitude: 87,88° | latitude: 26,44° | ||
| note (category: dynamical parallaxes): | 0.013". |
magnitude
| visual magnitude | 4,98 (V on UBV Johnson system) |
spectral / color information
| spectral class | A1V |
| B-V-magnitude | 0,08 |
| U-B-magnitude | 0,04 |
| R-I-magnitude |
| note (category: spectra): | Metal weak. |
double/multiple star system information
| number of components of multiple star system | 8 |
| separation | 3,8 arcsec |
| mag difference (of double or brightest multiple) | 2,8 |
| component ID | AB |
| note (category: double and multiple data): | AB binary with slow orbital motion. Combined mag., colors. B is A5p, vsini 80k/s. C, 7.1v F6V at 90" CPM. Some discordance whether B or C is the brighter. |
| note (category: spectroscopic binaries): | ADS 11336A. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 18h 23min 54,645sec | DEC: +58° 48' 2,78'' | ±0,43 arcsec | source: 16 |
| position (2001,21) | RA: 18h 23min 56sec | DEC: +58° 48' 6'' | JD: 2451987,37 | |
| proper motion (J2000) | RA: -0,0039 arcsec/a | DEC: 0,061 arcsec/a | source: 25 | |
| radial velocity | -15 km/s | source: 25 | ||
| trigonometric parallax | 0,035 arcsec | ±0,003 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 87,88° | latitude: 26,44° | ||
magnitude:
| visual | 4,98 (observed) | source: 25 |
| photovisual | 4,9 | source: 2 |
| photographic | 4,9 | source: 16 |
spectral information:
| spectral class | A2 | source: 96 | |
| Morgan-Keenan | A1V | source: 25 | |
| B-magnitude | 5,06 ±0,05 | B-V-magnitude | 0,08 |
| U-magnitude | 5,1 ±0,05 | U-B-magnitude | 0,04 |
double/multiple star system information:
| separation between brightest and second brightest component | 3,8 arcsec |
| magnitude difference between brightest and second brightest component | 2,5 |
| position angle | 351 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 4,98 | A2 | 39 Dra, HR 6923, HD 170073, SAO 30949 |
| B | 7,9 | F8 |
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: 18h 23min 10,673sec | DEC: +58° 46' 16,5'' | ±0,009 arcsec |
| position (2001,21) | RA: 18h 23min 56sec | DEC: +58° 48' 1'' | JD: 2451987,37 |
| position (J2000) | RA: 18h 23min 54,545sec | DEC: +58° 48' 2,34'' | |
| proper motion B1950 (FK4) | RA: -0,0057 arcsec/a | DEC: 0,061 arcsec/a | ±0,002 arcsec/a in RA ±0,002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0,005 arcsec/a | DEC: 0,06 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4,9 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
| spectral class | A2 |
| source of spectral data | Taken from the HD with M stars reclassified by Miss Cannon. |
catalogues
| source catalogue | FK3, catalogue number: 694 |
| Durchmusterung | BD+58 1809 |
| Boss General Catalogue | 25151 |
| Henry Draper Catalogue | 170073 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 18h 23,9min | DEC: +58° 48' |
| proper motion (J2000) | RA: -0,037 arcsec/a | DEC: 0,062 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 | 1833 | 71 | 6° | 3,1'' | 5,1 | 7,6 | A1V | STF2323 |
| 1975 | 351° | 3,8'' | ||||||
| AC | 1834 | 28 | 21° | 88,9'' | 5,1 | 7,9 | - | STF2323 |
| AE | 1880 | 2 | 66° | 198'' | 4,8 | 10,8 | - | STF2323 |
| AF | 1910 | 1 | 80° | 150,3'' | 4,8 | 11,1 | - | STF2323 |
| AG | 1918 | 1 | 254° | 36'' | 4,8 | 14,1 | - | STF2323 |
| AH | 1918 | 1 | 86° | 41,3'' | 4,8 | 14,1 | - | STF2323 |
| BC | 1903 | 3 | 22° | 85,6'' | 7,9 | 7,3 | - | STF2323 |
discoverer information:
| discoverer code | discoverer | reference |
| STF2323 | Struve, F.G.W. | - |
notes:
| note | 39 Dra. A is a double-lined spectroscopic binary. C is physical, and is a spectroscopic binary, P =2.71d. |