Alsafi
catalogues and names
| catalogues and names | Alsafi, s Dra, NSV 12176, 61 Dra, HR 7462, HD 185144, SAO 18396, BD +69 1053, WDS 19324+6940 |
| other names | Athafi |
| constellation | Draco |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
| note (category: star names): | Alsafi; Athafi. |
position, motion, parallax:
| position (J2000) | RA: 19h 32min 21.6sec | DEC: +69° 39' 40'' | ||
| position (B1900) | RA: 19h 32min 33.2sec | DEC: +69° 29' 28'' | ||
| proper motion (J2000) | RA: 0.6 arcsec/a | DEC: -1.738 arcsec/a | ||
| radial velocity | 27 km/s note: variable radial velocity |
|||
| rotational velocity | <17 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0.177 arcsec | |||
| galactic coordinates | longitude: 101.32° | latitude: 21.89° | ||
magnitude
| visual magnitude | 4.68 (V on UBV Johnson system) |
spectral / color information
| spectral class | K0V |
| B-V-magnitude | 0.79 |
| U-B-magnitude | 0.38 |
| R-I-magnitude | |
| IR-note | object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978) |
variability information
| variable star identification | 12176 |
double/multiple star system information
| separation | 315.6 arcsec |
| note | Worley (1978) update of the IDS |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 19h 32min 21.594sec | DEC: +69° 39' 40.79'' | ±0.2 arcsec | source: 52 |
| proper motion (J2000) | RA: 0.1144 arcsec/a | DEC: -1.729 arcsec/a | source: 25 | |
| radial velocity | 27 km/s | source: 25 | ||
| trigonometric parallax | 0.177 arcsec | ±0.018 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 101.33° | latitude: 21.89° | ||
magnitude:
| visual | 4.68 (observed) | source: 25 |
| photovisual | 4.8 | source: 2 |
| photographic | 5.8 | source: 16 |
spectral information:
| spectral class | K0 | source: 96 | |
| Morgan-Keenan | K0V | source: 25 | |
| B-magnitude | 5.47 ±0.05 | B-V-magnitude | 0.79 |
| U-magnitude | 5.85 ±0.05 | U-B-magnitude | 0.38 |
double/multiple star system information:
| separation between brightest and second brightest component | 315.6 arcsec |
| position angle | 340 ° |
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 (B1950) | RA: 19h 32min 27.585sec | DEC: +69° 34' 34.11'' | ±0.016 arcsec |
| position (J2000) | RA: 19h 32min 21.633sec | DEC: +69° 39' 40.14'' | |
| proper motion B1950 (FK4) | RA: 0.1098 arcsec/a | DEC: -1.744 arcsec/a | ±0.002 arcsec/a in RA ±0.002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.1152 arcsec/a | DEC: -1.739 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 | K0 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | GC, catalogue number: 27050 |
| Durchmusterung | BD+69 1053 |
| Boss General Catalogue | 27050 |
| Henry Draper Catalogue | 185144 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 19h 32.4min | DEC: +69° 40' |
| proper motion (J2000) | RA: 0.593 arcsec/a | DEC: 0 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 |
| - | 1852 | 3 | 340° | 223.7'' | 4.68 | - | K0V | STT |
| 1902 | - | 315.6'' |
discoverer information:
| discoverer code | discoverer | reference |
| STT | Struve, O. |
notes:
| note | Sigma Dra. Proper motion +593 -1738. |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 19h 32min 27.6sec | DEC: +69° 34' 34'' |
variability informations:
| magnitute at max. brightness | 4.68 |
| magnitute at min. brightness | 4.75 |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | K0 |
references
| to a study | 290477D (designation: ZI 1764) |
miscanellous
| There are notes in the published catalog (Kukarkin et al.(1982)). |