15 Aquilae
catalogues and names
| catalogues and names | 15 Aql, HR 7225, HD 177463, SAO 142996, BD -4 4684, WDS 19050-0402A |
| constellation | Aquila |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 19h 4min 57,6sec | DEC: -4° 1' 53'' | ||
| position (2001,21) | RA: 19h 5min 2sec | DEC: -4° 1' 46'' | ||
| position (B1900) | RA: 18h 59min 40,9sec | DEC: -4° 10' 49'' | ||
| proper motion (J2000) | RA: 0,02 arcsec/a | DEC: -0,027 arcsec/a | ||
| radial velocity | -18 km/s note: suspected variable radial velocity |
|||
| rotational velocity | =<25 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0,002 arcsec | |||
| galactic coordinates | longitude: 30,88° | latitude: -4,84° | ||
magnitude
| visual magnitude | 5,42 (V on UBV Johnson system) |
spectral / color information
| spectral class | K1III |
| B-V-magnitude | 1,12 |
| U-B-magnitude | 1,01 |
| R-I-magnitude | |
| IR-note | object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978) |
double/multiple star system information
| separation | 38,5 arcsec |
| mag difference (of double or brightest multiple) | 1,6 |
| note (category: double and multiple data): | Companion gK4, optical. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 19h 4min 57,685sec | DEC: -4° 1' 53,24'' | ±0,19 arcsec | source: 16 |
| position (2001,21) | RA: 19h 5min 2sec | DEC: -4° 1' 46'' | JD: 2451987,35 | |
| proper motion (J2000) | RA: 0,0019 arcsec/a | DEC: -0,027 arcsec/a | source: 25 | |
| radial velocity | -18 km/s | source: 25 | ||
| trigonometric parallax | 0,002 arcsec | - | source: 25 | |
| galactic coord. (B1950) | longitude: 30,88° | latitude: -4,84° | ||
magnitude:
| visual | 5,42 (observed) | source: 25 |
| photovisual | 5,3 | source: 16 |
| photographic | 6,5 | source: 2 |
spectral information:
| spectral class | K0 | source: 96 | |
| Morgan-Keenan | K1III | source: 25 | |
| B-magnitude | 6,54 ±0,05 | B-V-magnitude | 1,12 |
| U-magnitude | 7,55 ±0,05 | U-B-magnitude | 1,01 |
double/multiple star system information:
| separation between brightest and second brightest component | 38,8 arcsec |
| magnitude difference between brightest and second brightest component | 1,8 |
| position angle | 209 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 5,42 | K0 | 15 Aql, HR 7225, HD 177463, SAO 142996 |
| B | 7,017 | K0 |
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 2min 19,217sec | DEC: -4° 6' 26,7'' | ±0,014 arcsec |
| position (2001,21) | RA: 19h 5min 1sec | DEC: -4° 1' 46'' | JD: 2451987,35 |
| position (J2000) | RA: 19h 4min 57,64sec | DEC: -4° 1' 53,31'' | |
| proper motion B1950 (FK4) | RA: 0,0011 arcsec/a | DEC: -0,027 arcsec/a | ±0,003 arcsec/a in RA ±0,002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,0013 arcsec/a | DEC: -0,027 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 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: 26237 |
| Durchmusterung | BD-04 4684 |
| Boss General Catalogue | 26237 |
| Henry Draper Catalogue | 177463 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 19h 5min | DEC: -4° 2' |
| proper motion (J2000) | RA: 0,029 arcsec/a | DEC: -0,027 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 |
| - | 1823 | 30 | 207° | 35,6'' | 5,42 | 7,2 | K0IV | SHJ 286 |
| 1976 | 209° | 38,8'' |
discoverer information:
| discoverer code | discoverer | reference |
| SHJ 286 | South & Herschel | - |
notes:
| note | 15 Aql. B is BD-04@4683. Proper motion of B +034 -036. |