19 Draconis
catalogues and names
| catalogues and names | NSV 08078, 19 Dra, HR 6315, HD 153597, SAO 17281, BD +65 1157 |
| constellation | Draco |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 16h 56min 1.7sec | DEC: +65° 8' 5'' | ||
| position (B1900) | RA: 16h 55min 28.6sec | DEC: +65° 17' 15'' | ||
| proper motion (J2000) | RA: 0.24 arcsec/a | DEC: 0.05 arcsec/a | ||
| radial velocity | -23 km/s note: spectroscopic binaries, single lined spectra note: orbital data avaible |
|||
| rotational velocity | 0 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0.062 arcsec | |||
| galactic coordinates | longitude: 95.68° | latitude: 36.47° | ||
magnitude
| visual magnitude | 4.89 (V on UBV Johnson system) |
spectral / color information
| spectral class | F6V |
| B-V-magnitude | 0.48 |
| U-B-magnitude | -0.03 |
| R-I-magnitude |
variability information
| variable star identification | 8078 |
| note (category: variability): | Delta Sct?, 4.85 - 4.91V. |
double/multiple star system information
| note (category: spectroscopic binaries): | 52.1089d, K 17.6k/s, V0 -20.9k/s, asini 12.3. Unresolved by speckle interferometry. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 16h 56min 1.679sec | DEC: +65° 8' 5.21'' | ±0.2 arcsec | source: 52 |
| proper motion (J2000) | RA: 0.0373 arcsec/a | DEC: 0.051 arcsec/a | source: 25 | |
| radial velocity | -23 km/s | source: 25 | ||
| trigonometric parallax | 0.062 arcsec | ±0.006 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 95.68° | latitude: 36.47° | ||
magnitude:
| visual | 4.89 (observed) | source: 25 |
| photovisual | 4.8 | source: 2 |
| photographic | 5.2 | source: 16 |
spectral information:
| spectral class | F5 | source: 96 | |
| Morgan-Keenan | F6V | source: 25 | |
| B-magnitude | 5.37 ±0.05 | B-V-magnitude | 0.48 |
| U-magnitude | 5.34 ±0.05 | U-B-magnitude | -0.03 |
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 | |
| 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 (B1950) | RA: 16h 55min 44.806sec | DEC: +65° 12' 39.2'' | ±0.012 arcsec |
| position (J2000) | RA: 16h 56min 1.72sec | DEC: +65° 8' 5.02'' | |
| proper motion B1950 (FK4) | RA: 0.0371 arcsec/a | DEC: 0.046 arcsec/a | ±0.002 arcsec/a in RA ±0.002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.038 arcsec/a | DEC: 0.05 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4.8 (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. |
catalogues
| source catalogue | GC, catalogue number: 22871 |
| Durchmusterung | BD+65 1157 |
| Boss General Catalogue | 22871 |
| Henry Draper Catalogue | 153597 |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 16h 55min 44.8sec | DEC: +65° 12' 39'' |
variability informations:
| variability type | DSCT: | pulsating variable star |
| magnitute at max. brightness | 4.85 | |
| magnitute at min. brightness | 4.91 | |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | F6 |
references
| to a study | 140098D (designation: *) |
miscanellous
| There are notes in the published catalog (Kukarkin et al.(1982)). |
variability type description
| variability type | description |
| DSCT |
Variables of the Delta Scuti type. These are pulsating variables of spectral types A0-F5 III-V displaying light amplitudes from 0.003 to 0.9 mag in V (usually several hundredths of a magnitude) and periods from 0.01 to 0.2 days. The shapes of the light curves, periods, and amplitudes usually vary greatly. Radial as well as nonradial pulsations are observed. The variability of some members of this type appears sporadically and sometimes completely ceases, this being a consequence of strong amplitude modulation with the lower value of the amplitude not exceeding 0.001 mag in some cases. The maximum of the surface layer expansion does not lag behind the maximum light for more than 0.1 periods. DSCT stars are representatives of the galactic disk (flat component) and are phenomenologically close to the SX Phe variables. DSCTC Low amplitude group of Delta Sct variables (light amplitude <0.1 mag in V). The majority of this type's representatives are stars of luminosity class V; objects of this subtype generally are representative of the Delta Sct variables in open clusters. |