24 Aquilae
catalogues and names
| catalogues and names | 24 Aql, HR 7321, HD 181053, SAO 124492, BD +0 4170, WDS 19188+0020A |
| constellation | Aquila |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 19h 18min 50.9sec | DEC: +0° 20' 21'' | ||
| position (B1900) | RA: 19h 13min 44sec | DEC: +0° 9' 24'' | ||
| proper motion (J2000) | RA: 0.012 arcsec/a | DEC: 0.012 arcsec/a | ||
| radial velocity | -29 km/s note: suspected variable radial velocity |
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| trigonometric parallax | 0.01 arcsec | |||
| galactic coordinates | longitude: 36.37° | latitude: -5.94° | ||
magnitude
| visual magnitude | 6.41 (V on UBV Johnson system) |
spectral / color information
| spectral class | K0-IIIa:Ba0.4CH1 |
| B-V-magnitude | 1.05 |
| U-B-magnitude | 0.79 |
double/multiple star system information
| number of components of multiple star system | 4 |
| separation | 423.4 arcsec |
| mag difference (of double or brightest multiple) | 0.2 |
| component ID | AB |
| note | Worley (1978) update of the IDS |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 19h 18min 50.94sec | DEC: +0° 20' 20.47'' | ±0.2 arcsec | source: 52 |
| proper motion (J2000) | RA: 0.001 arcsec/a | DEC: 0.013 arcsec/a | source: 25 | |
| radial velocity | -29 km/s | source: 25 | ||
| trigonometric parallax | 0.01 arcsec | ±0.001 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 36.38° | latitude: -5.94° | ||
magnitude:
| visual | 6.41 (observed) | source: 25 |
| photovisual | 6.5 | source: 2 |
| photographic | 7.8 | source: 16 |
spectral information:
| spectral class | K0 | source: 96 | |
| Morgan-Keenan | K0-IIIa:Ba0.5CH1 | source: 25 | |
| B-magnitude | 7.46 ±0.05 | B-V-magnitude | 1.05 |
| U-magnitude | 8.25 ±0.05 | U-B-magnitude | 0.79 |
double/multiple star system information:
| separation between brightest and second brightest component | 49.5 arcsec |
| magnitude difference between brightest and second brightest component | 6.2 |
| position angle | 160 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 6.41 | K0 | 24 Aql, HR 7321, HD 181053, SAO 124492 |
| B | 6.73 | F0 |
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 16min 17.404sec | DEC: +0° 14' 47.21'' | ±0.021 arcsec |
| position (J2000) | RA: 19h 18min 50.905sec | DEC: +0° 20' 20.58'' | |
| proper motion B1950 (FK4) | RA: 0.0006 arcsec/a | DEC: 0.013 arcsec/a | ±0.004 arcsec/a in RA ±0.003 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0008 arcsec/a | DEC: 0.012 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 6.5 (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: 26629 |
| Durchmusterung | BD+00 4170 |
| Boss General Catalogue | 26629 |
| Henry Draper Catalogue | 181053 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 19h 18.8min | DEC: +0° 20' |
| proper motion (J2000) | RA: 0.02 arcsec/a | DEC: 0.007 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 |
| Aa | 1911 | 1 | 160° | 49.5'' | 6.41 | 12.6 | K0IIIa | STF 40 |
| AB | 1835 | 7 | 316° | 423.4'' | 6.41 | 6.7 | - | STF 40 |
| Bb | 1911 | 1 | 302° | 59.8'' | 6.7 | 11.5 | F0 | STF 40 |
discoverer information:
| discoverer code | discoverer | reference |
| STF 40 | Struve, F.G.W. | - |
notes:
| note | 24 Aql. Alternate spectral type of A: K0IIIa:Ba0.3CH1. |