1 Aquarii
catalogues and names
| catalogues and names | 1 Aqr, HR 7897, HD 196758, SAO 126062, BD +0 4064, FK5: 3651, WDS 20394+0029A |
| constellation | Aquarius |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 20h 39min 24.9sec | DEC: +0° 29' 11'' | ||
| position (B1900) | RA: 20h 34min 17.4sec | DEC: +0° 8' 5'' | ||
| proper motion (J2000) | RA: 0.101 arcsec/a | DEC: -0.015 arcsec/a | ||
| radial velocity | -43 km/s note: variable radial velocity |
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| rotational velocity | <19 km/s | |||
| trigonometric parallax | 0.01 arcsec | |||
| galactic coordinates | longitude: 46.47° | latitude: -23.58° | ||
magnitude
| visual magnitude | 5.16 (V on UBV Johnson system) |
spectral / color information
| spectral class | K1III |
| B-V-magnitude | 1.06 |
| U-B-magnitude | 0.97 |
| IR-note | object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978) |
double/multiple star system information
| number of components of multiple star system | 3 |
| separation | 59.7 arcsec |
| mag difference (of double or brightest multiple) | 7.1 |
| component ID | AB |
| note (category: double and multiple data): | Both companions optical. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 20h 39min 24.893sec | DEC: +0° 29' 12.45'' | ±0.43 arcsec | source: 16 |
| proper motion (J2000) | RA: 0.0065 arcsec/a | DEC: 0.002 arcsec/a | source: 25 | |
| radial velocity | -43 km/s | source: 25 | ||
| trigonometric parallax | 0.01 arcsec | ±0.001 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 46.48° | latitude: -23.58° | ||
magnitude:
| visual | 5.16 (observed) | source: 25 |
| photovisual | 5.4 | source: 2 |
| photographic | 6.3 | source: 16 |
spectral information:
| spectral class | K0 | source: 96 | |
| Morgan-Keenan | K1III | source: 25 | |
| B-magnitude | 6.22 ±0.05 | B-V-magnitude | 1.06 |
| U-magnitude | 7.19 ±0.05 | U-B-magnitude | 0.97 |
double/multiple star system information:
| separation between brightest and second brightest component | 59.7 arcsec |
| magnitude difference between brightest and second brightest component | 6.4 |
| position angle | 221 ° |
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: 20h 36min 51.135sec | DEC: +0° 18' 33.97'' | ±0.018 arcsec |
| position (J2000) | RA: 20h 39min 24.893sec | DEC: +0° 29' 11.13'' | |
| proper motion B1950 (FK4) | RA: 0.0065 arcsec/a | DEC: -0.013 arcsec/a | ±0.003 arcsec/a in RA ±0.003 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0067 arcsec/a | DEC: -0.016 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5.4 (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. |
remarks for duplicity and variability
| Double star in Aitken's Double Star Catalogue (Aitken 1932) |
catalogues
| source catalogue | GC, catalogue number: 28761 |
| Durchmusterung | BD-00 4064 |
| Boss General Catalogue | 28761 |
| Henry Draper Catalogue | 196758 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 20h 39.4min | DEC: +0° 29' |
| proper motion (J2000) | RA: 0.101 arcsec/a | DEC: -0.015 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 | 1879 | 4 | 217° | 55.9'' | 5.05 | 11.5 | K0III | HJ 2984 |
| 1924 | 221° | 59.7'' | ||||||
| AC | 1879 | 4 | 39° | 72.9'' | 5.05 | 11.3 | - | HJ 2984 |
| 1924 | 36° | 69.8'' |
discoverer information:
| discoverer code | discoverer | reference |
| HJ 2984 | Herschel, J. | - |
notes:
| note | 1 Aqr. |