V1288 Aquilae
catalogues and names
| catalogues and names | V1288 Aql, 21 Aql, HR 7287, HD 179761, SAO 124408, BD +2 3824, FK5: 3537, WDS 19137+0218 |
| constellation | Aquila |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 19h 13min 42.7sec | DEC: +2° 17' 37'' | ||
| position (B1900) | RA: 19h 8min 40.1sec | DEC: +2° 7' 25'' | ||
| proper motion (J2000) | RA: 0.009 arcsec/a | DEC: -0.003 arcsec/a | ||
| radial velocity | -5 km/s note: variable radial velocity |
|||
| rotational velocity | 19 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0.009 arcsec | |||
| galactic coordinates | longitude: 37.52° | latitude: -3.9° | ||
magnitude
| visual magnitude | 5.15 (V on UBV Johnson system) |
spectral / color information
| spectral class | B8II-III |
| B-V-magnitude | -0.07 |
| U-B-magnitude | -0.41 |
variability information
| variable star identification | V1288 Aql |
| note (category: variability): | Alpha CV 5.06 - 5.16V, 1.73d. |
double/multiple star system information
| separation | 36.2 arcsec |
| mag difference (of double or brightest multiple) | 7.5 |
| note (category: double and multiple data): | Companion optical. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 19h 13min 42.707sec | DEC: +2° 17' 37.26'' | ±0.22 arcsec | source: 15 |
| proper motion (J2000) | RA: 0.0006 arcsec/a | DEC: -0.003 arcsec/a | source: 25 | |
| radial velocity | -5 km/s | source: 25 | ||
| trigonometric parallax | 0.009 arcsec | ±0.001 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 37.53° | latitude: -3.9° | ||
magnitude:
| visual | 5.1 (observed) | source: 31 |
| photovisual | 5.1 | source: 2 |
spectral information:
| spectral class | B8 | source: 96 | |
| Morgan-Keenan | B8II-III | source: 25 | |
| B-magnitude | 5.08 ±0.05 | B-V-magnitude | -0.07 |
| U-magnitude | 4.67 ±0.05 | U-B-magnitude | -0.41 |
variability information:
| variability type | 160 |
| var. amplitude | 0.1 |
| var. period | 1.73 |
| var. epoch | 2444099 13. August 1979, 12:00:00 UT |
| next max light | 2452219.62 6. November 2001, 02:52:48 UT |
double/multiple star system information:
| separation between brightest and second brightest component | 36.2 arcsec |
| magnitude difference between brightest and second brightest component | 7.2 |
| position angle | 287 ° |
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 | |
| 15 | FK5, FK5 Extension and FK5 Supplement |
| Fricke, W., H. Schwan and T. Lederle, "Fifth Fundamental Catalogue (FK5), Part I. The Basic Fundamental Stars," Veroff. Astronomisches Recheninstitut, No. 32, Heidelberg, Germany, 1988, and Fricke, W., H. Schwan, and T.E. Corbin, "Fifth Fundamental Catalogue (FK5), Part II. The FK5 Extension," Veröff. Astronomisches Recheninstitut, No. 33, Heidelberg, Germany, 1991 | |
| 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 | |
| 30 | GCVS, 4th edition |
| Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88 | |
| 31 | CRM' (non-GCVS variable data) |
| Warren, W.H. Jr., Northern Hemisphere Catalog of Red Magnitudes, 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 11min 11.383sec | DEC: +2° 12' 25.96'' | ±0.012 arcsec |
| position (J2000) | RA: 19h 13min 42.706sec | DEC: +2° 17' 37.63'' | |
| proper motion B1950 (FK4) | RA: 0.0005 arcsec/a | DEC: 0.003 arcsec/a | ±0.002 arcsec/a in RA ±0.002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0007 arcsec/a | DEC: 0.002 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5.1 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | B8 |
| 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: 26490 |
| Durchmusterung | BD+02 3824 |
| Boss General Catalogue | 26490 |
| Henry Draper Catalogue | 179761 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 19h 13.7min | DEC: +2° 18' |
| proper motion (J2000) | RA: 0.009 arcsec/a | DEC: -0.003 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 |
| - | 1878 | 3 | 287° | 36.2'' | 5.15 | 12.3 | B8II-III | HJ 879 |
discoverer information:
| discoverer code | discoverer | reference |
| HJ 879 | Herschel, J. | - |
notes:
| note | 21 Aql. A is the Alpha CVn-type variable V1288 Aql. Spectrum of B: F8V. |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 19h 11min 11.4sec | DEC: +2° 12' 26'' |
variability informations:
| variability type | ACV | rotating variable star |
| magnitute at max. brightness | 5.06 | |
| magnitute at min. brightness | 5.16 | |
| photometric system | visual, photovisual or Johnson's V | |
| epoch for maximum light [JD] | 2444099.23 13. August 1979, 17:31:12 UT |
|
| period [d] | 1.73 | |
| next maximum light [JD] | 2452219.85 6. November 2001, 08:24:00 UT |
spectral information
| spectral class | B8II-IIIp(Hg:) |
references
| to a study | Vol. I GCVS (see Kholopov et al. 1985-1988) |
| to a chart/photograph | no chart is avaible, but the star is contained in the 'Bonner Durchmusterung' |
miscanellous
| ID in the GCVS catalogue | 5/1288 |
| constellation | Aquila |
| notes on existence | The star is equivalent to '0051289 V1289'. |
| There are notes in published catalog. | |
variability type description
| variability type | description |
| ACV | Alpha2 Canum Venaticorum variables. These are main-sequence stars with spectral types B8p-A7p and displaying strong magnetic fields. Spectra show abnormally strong lines of Si, Sr, Cr, and rare earths whose intensities vary with rotation. They exhibit magnetic field and brightness changes (periods of 0.5-160 days or more). The amplitudes of the brightness changes are usually withine 0.01-0.1 mag in V. ACVO Rapidly oscillating Alpha2 CVn variables. These are nonradially pulsating, rotating magnetic variables of Ap spectral type (DO Eri). Pulsation periods are in the range of 6-12 mmag (0.004-0.01 days), while amplitudes of light variation caused by the pulsation are about 0.01 mag in V. The pulsational variations are superposed on those caused by rotation. |