18 Aquarii
catalogues and names
| catalogues and names | NSV 13684, 18 Aqr, HR 8187, HD 203705, SAO 164364, BD -13 5923, FK5: 1562, WDS 21242-1253 |
| constellation | Aquarius |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 21h 24min 11.5sec | DEC: -12° 52' 41'' | ||
| position (B1900) | RA: 21h 18min 43.6sec | DEC: -13° 18' 26'' | ||
| proper motion (J2000) | RA: 0.091 arcsec/a | DEC: 0.008 arcsec/a | ||
| radial velocity | 8 km/s note: variable radial velocity |
|||
| rotational velocity | 120 km/s (uncertain) (variable) | |||
| galactic coordinates | longitude: 38.63° | latitude: -39.64° | ||
magnitude
| visual magnitude | 5.49 (V on UBV Johnson system) |
spectral / color information
| spectral class | F1V |
| B-V-magnitude | 0.29 |
variability information
| variable star identification | 13684 |
double/multiple star system information
| separation | 48.9 arcsec |
| mag difference (of double or brightest multiple) | 7.5 |
| note | Worley (1978) update of the IDS |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 21h 24min 11.499sec | DEC: -12° 52' 41.27'' | ±0.06 arcsec | source: 15 |
| proper motion (J2000) | RA: 0.0062 arcsec/a | DEC: 0.008 arcsec/a | source: 25 | |
| radial velocity | 8 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 38.64° | latitude: -39.64° | ||
magnitude:
| visual | 5.49 (observed) | source: 25 |
| photovisual | 5.5 | source: 2 |
| photographic | 5.7 | source: 2 |
spectral information:
| spectral class | A5 | source: 96 | |
| Morgan-Keenan | F1V | source: 25 | |
| B-magnitude | 5.78 ±0.05 | B-V-magnitude | 0.29 |
double/multiple star system information:
| separation between brightest and second brightest component | 48.9 arcsec |
| magnitude difference between brightest and second brightest component | 7.5 |
| position angle | 321 ° |
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 | |
| 15 | FK5, FK5 Extension and FK5 Supplement |
| Fricke, W., H. Schwan and T. Lederle, "Fifth Fundamental Catalogue (FK5), Part I. The Basic Fundamental Stars," Veroff. Astronomisches Recheninstitut, No. 32, Heidelberg, Germany, 1988, and Fricke, W., H. Schwan, and T.E. Corbin, "Fifth Fundamental Catalogue (FK5), Part II. The FK5 Extension," Veröff. Astronomisches Recheninstitut, No. 33, Heidelberg, Germany, 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 (B1950) | RA: 21h 21min 27.648sec | DEC: -13° 5' 37.46'' | ±0.006 arcsec |
| position (J2000) | RA: 21h 24min 11.499sec | DEC: -12° 52' 41.36'' | |
| proper motion B1950 (FK4) | RA: 0.006 arcsec/a | DEC: 0.009 arcsec/a | ±0.002 arcsec/a in RA ±0.002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0062 arcsec/a | DEC: 0.007 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5.5 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
| spectral class | A5 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | FK4, catalogue number: 1562 |
| Durchmusterung | BD-13 5923 |
| Boss General Catalogue | 29957 |
| Henry Draper Catalogue | 203705 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 21h 24.2min | DEC: -12° 53' |
| proper motion (J2000) | RA: 0.091 arcsec/a | DEC: 0.009 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 |
| - | 1877 | 2 | 326° | 47.8'' | 5.49 | 13 | F1V | HJ 5517 |
| 1912 | 321° | 48.9'' |
discoverer information:
| discoverer code | discoverer | reference |
| HJ 5517 | Herschel, J. | - |
notes:
| note | 18 Aqr. |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 21h 21min 27.6sec | DEC: -13° 5' 37'' |
variability informations:
| variability type | - |
| magnitute at max. brightness | 5.48 |
| magnitute at min. brightness | |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | F0 |
references
| to a study | 2339D (designation: 18 AQR) |
miscanellous
| There are notes in the published catalog (Kukarkin et al.(1982)). |