56 Aquilae
catalogues and names
| catalogues and names | 56 Aql, HR 7584, HD 188154, SAO 143894, BD -8 5150, WDS 19541-0834 |
| constellation | Aquila |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 19h 54min 8.2sec | DEC: -8° 34' 27'' | ||
| position (B1900) | RA: 19h 48min 42.7sec | DEC: -8° 50' 2'' | ||
| proper motion (J2000) | RA: 0.005 arcsec/a | DEC: -0.018 arcsec/a | ||
| radial velocity | -50 km/s note: suspected variable radial velocity |
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| galactic coordinates | longitude: 32.28° | latitude: -17.8° | ||
magnitude
| visual magnitude | 5.79 (V on UBV Johnson system) |
spectral / color information
| spectral class | gK5 |
| B-V-magnitude | 1.64 |
| U-B-magnitude | 2 |
| IR-note | object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978) |
double/multiple star system information
| separation | 46.5 arcsec |
| mag difference (of double or brightest multiple) | 6.1 |
| note | Worley (1978) update of the IDS |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 19h 54min 8.292sec | DEC: -8° 34' 27.27'' | ±0.19 arcsec | source: 16 |
| proper motion (J2000) | RA: 0.0006 arcsec/a | DEC: -0.017 arcsec/a | source: 25 | |
| radial velocity | -50 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 32.28° | latitude: -17.8° | ||
magnitude:
| visual | 5.79 (observed) | source: 25 |
| photovisual | 5.4 | source: 16 |
| photographic | 7.2 | source: 2 |
spectral information:
| spectral class | K5 | source: 96 | |
| Morgan-Keenan | gK5 | source: 25 | |
| B-magnitude | 7.43 ±0.05 | B-V-magnitude | 1.64 |
| U-magnitude | 9.43 ±0.05 | U-B-magnitude | 2 |
double/multiple star system information:
| separation between brightest and second brightest component | 46.5 arcsec |
| magnitude difference between brightest and second brightest component | 6.57 |
| position angle | 77 ° |
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: 19h 51min 25.493sec | DEC: -8° 42' 19.98'' | ±0.022 arcsec |
| position (J2000) | RA: 19h 54min 8.244sec | DEC: -8° 34' 27.32'' | |
| proper motion B1950 (FK4) | RA: 0.0001 arcsec/a | DEC: -0.018 arcsec/a | ±0.004 arcsec/a in RA ±0.003 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0003 arcsec/a | DEC: -0.019 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 6 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | K5 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | GC, catalogue number: 27546 |
| Durchmusterung | BD-08 5150 |
| Boss General Catalogue | 27546 |
| Henry Draper Catalogue | 188154 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 19h 54.1min | DEC: -8° 34' |
| proper motion (J2000) | RA: 0.011 arcsec/a | DEC: -0.016 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 |
| - | 1880 | 2 | 77° | 46.5'' | 5.75 | 12.32 | K5III | HJ 900 |
discoverer information:
| discoverer code | discoverer | reference |
| HJ 900 | Herschel, J. | - |
notes:
| note | 56 Aql. |