17 Dra
| catalogues and names | 17 Dra, HR 6185, HD 150117, SAO 30013, WDS 16362+5255A |
| constellation | Draco |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 16h 36min 13,7sec | DEC: +52° 55' 28'' |
| position (J1900) | RA: 16h 33min 51,9sec | DEC: +53° 7' 31'' |
| proper motion (J2000) | RA: -0,009 arcsec/a | DEC: 0,027 arcsec/a |
| radial velocity | -10 km/s note: variable radial velocity |
|
| rotational velocity | 216 km/s (uncertain) (variable) | |
| dynamical parallax | 0,01 arcsec | |
magnitude
| visual magnitude | 5,08 (V on UBV Johnson system) |
spectral / color information
| spectral class | B9V |
| B-V-magnitude | -0,04 |
| U-B-magnitude | -0,15 |
double/multiple star system information
| number of components of multiple star system | 4 |
| separation | 90,3 arcsec |
| mag difference (of double or brightest multiple) | 0 |
| component ID | AC |
| note (category: double and multiple data): | AB binary with HR 6186 = component D; combined colors, combined mag. 5.08, B8V, A1V. Component C = HR 6184 CPM. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 16h 36min 13,583sec | DEC: +52° 55' 28,44'' | ±0,35 arcsec | source: 17 |
| proper motion (J2000) | RA: -0,0053 arcsec/a | DEC: 0,047 arcsec/a | source: 25 | |
| radial velocity | -10 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 80,97° | latitude: 41,48° | ||
| GCI unit vector (J2000) | X: -0,215492 | Y: -0,563037 | Z: 0,797843 | |
magnitude:
| visual | 5,08 (observed) | source: 25 |
| photovisual | 5,6 | source: 2 |
| photographic | 5,6 | source: 16 |
spectral information:
| spectral class | A2 | source: 96 | |
| Morgan-Keenan | B9V | source: 25 | |
| B-magnitude | 5,04 ±0,05 | B-V-magnitude | -0,04 |
| U-magnitude | 4,88 ±0,05 | U-B-magnitude | -0,16 |
double/multiple star system information:
| separation between brightest and second brightest component | 3,3 arcsec |
| magnitude difference between brightest and second brightest component | 1 |
| position angle | 106 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 5,08 | A2 | 17 Dra, HR 6185, HD 150117, SAO 30013 |
| B | 6,53 | A2 | 17 Dra, HR 6186, HD 150118, |
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 | |
| 17 | ACRS |
| Corbin, T.E., and S.E. Urban, Astrographic Catalog Reference Stars, United States Naval Observatory, 1991 | |
| 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: 16h 35min 2,648sec | DEC: +53° 1' 27,12'' | ±0,018 arcsec |
| position (J2000) | RA: 16h 36min 13,742sec | DEC: +52° 55' 27,99'' | |
| proper motion J1950 (FK4) | RA: -0,0017 arcsec/a | DEC: 0,025 arcsec/a | ±0,003 arcsec/a in RA ±0,002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0,001 arcsec/a | DEC: 0,027 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5,6 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | A2 |
| 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: 22352 |
| Durchmusterung | BD+53 1876 |
| Boss General Catalogue | 22352 |
| Henry Draper Catalogue | 150117 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: 16h 36,2min | DEC: +52° 55' |
| proper motion (J2000) | RA: -0,048 arcsec/a | DEC: 0,047 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 | 1831 | 88 | 116° | 3,7'' | 5,6 | 6,6 | B9.5V | STF2078 |
| 1983 | 106° | 3,3'' | ||||||
| AC | 1833 | 32 | 194° | 90,3'' | 5,08 | 5,53 | - | STF 30 |
| BC | 1902 | 2 | 195° | 90'' | 6,6 | 5,6 | - | STF 30 |
| CD | 1879 | 3 | 122° | 116,9'' | 5,6 | 11,6 | B9.5V | STF 30 |
| 1956 | - | 120,1'' |
discoverer information:
| discoverer code | discoverer | reference |
| STF2078 | Struve, F.G.W. | - |
| STF 30 | Struve, F.G.W. | - |
notes:
| note | 17 Dra. Common proper motion with 16 Dra. C is 16 Dra. |