57 Aquilae
catalogues and names
| catalogues and names | 57 Aql, HR 7593, HD 188293, SAO 143898, BD -8 5154, WDS 19546-0814A |
| constellation | Aquila |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 19h 54min 37,6sec | DEC: -8° 13' 38'' | ||
| position (2001,21) | RA: 19h 54min 42sec | DEC: -8° 13' 26'' | ||
| position (B1900) | RA: 19h 49min 12,8sec | DEC: -8° 29' 16'' | ||
| proper motion (J2000) | RA: 0,01 arcsec/a | DEC: -0,025 arcsec/a | ||
| radial velocity | -6 km/s note: spectroscopic binaries |
|||
| rotational velocity | 340 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0,01 arcsec | |||
| galactic coordinates | longitude: 32,66° | latitude: -17,76° | ||
magnitude
| visual magnitude | 5,71 (V on UBV Johnson system) |
spectral / color information
| spectral class | B7Vn |
| B-V-magnitude | -0,08 |
| U-B-magnitude | -0,48 |
double/multiple star system information
| separation | 35,7 arcsec |
| mag difference (of double or brightest multiple) | 0,8 |
| note (category: double and multiple data): | CPM with HR 7594. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 19h 54min 37,659sec | DEC: -8° 13' 38,54'' | ±0,19 arcsec | source: 16 |
| position (2001,21) | RA: 19h 54min 42sec | DEC: -8° 13' 27'' | JD: 2451987,35 | |
| proper motion (J2000) | RA: 0,0004 arcsec/a | DEC: -0,03 arcsec/a | source: 25 | |
| radial velocity | -6 km/s | source: 25 | ||
| trigonometric parallax | 0,01 arcsec | ±0,001 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 32,67° | latitude: -17,76° | ||
magnitude:
| visual | 5,71 (observed) | source: 25 |
| photovisual | 5,9 | source: 16 |
| photographic | 5,6 | source: 2 |
spectral information:
| spectral class | B3 | source: 96 | |
| Morgan-Keenan | B7Vn | source: 25 | |
| B-magnitude | 5,63 ±0,05 | B-V-magnitude | -0,08 |
| U-magnitude | 5,15 ±0,05 | U-B-magnitude | -0,48 |
double/multiple star system information:
| separation between brightest and second brightest component | 36 arcsec |
| magnitude difference between brightest and second brightest component | 0,78 |
| position angle | 170 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 5,71 | B3 | 57 Aql, HR 7593, HD 188293, SAO 143898 |
| B | 6,49 | B7 | 57 Aql, HR 7594, HD 188294, SAO 143899 |
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 55,256sec | DEC: -8° 21' 32,32'' | ±0,014 arcsec |
| position (2001,21) | RA: 19h 54min 41sec | DEC: -8° 13' 25'' | JD: 2451987,35 |
| position (J2000) | RA: 19h 54min 37,647sec | DEC: -8° 13' 38,07'' | |
| proper motion B1950 (FK4) | RA: 0,0004 arcsec/a | DEC: -0,024 arcsec/a | ±0,003 arcsec/a in RA ±0,002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,0006 arcsec/a | DEC: -0,025 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5,8 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | B3 |
| 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: 27562 |
| Durchmusterung | BD-08 5154 |
| Boss General Catalogue | 27562 |
| Henry Draper Catalogue | 188293 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 19h 54,6min | DEC: -8° 14' |
| proper motion (J2000) | RA: 0,015 arcsec/a | DEC: -0,03 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 |
| - | 1833 | 40 | 172° | 36'' | 5,71 | 6,49 | B7Vn B8V | STF2594 |
| 1968 | 170° | - |
discoverer information:
| discoverer code | discoverer | reference |
| STF2594 | Struve, F.G.W. | - |
notes:
| note | 57 Aql. B is BD-08@5155. Proper motion of B +014 -025. Both components are spectroscopic binaries. |