68 Aquilae
catalogues and names
| catalogues and names | 68 Aql, HR 7821, HD 194939, SAO 144468, BD -3 4906, WDS 20284-0321 |
| constellation | Aquila |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 20h 28min 24.9sec | DEC: -3° 21' 28'' | ||
| position (B1900) | RA: 20h 23min 10.7sec | DEC: -3° 41' 17'' | ||
| proper motion (J2000) | RA: 0.023 arcsec/a | DEC: -0.015 arcsec/a | ||
| radial velocity | -9 km/s note: variable radial velocity |
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| galactic coordinates | longitude: 41.36° | latitude: -23.05° | ||
magnitude
| visual magnitude | 6.13 (V on UBV Johnson system) |
spectral / color information
| spectral class | B9V |
| B-V-magnitude | -0.06 |
| U-B-magnitude | -0.18 |
double/multiple star system information
| separation | 9.8 arcsec |
| mag difference (of double or brightest multiple) | 7.7 |
| note | Worley (1978) update of the IDS |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 20h 28min 24.921sec | DEC: -3° 21' 27.69'' | ±0.19 arcsec | source: 16 |
| proper motion (J2000) | RA: 0.0023 arcsec/a | DEC: -0.007 arcsec/a | source: 25 | |
| radial velocity | -9 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 41.36° | latitude: -23.05° | ||
magnitude:
| visual | 6.13 (observed) | source: 25 |
| photovisual | 6.8 | source: 16 |
| photographic | 6 | source: 2 |
spectral information:
| spectral class | B9 | source: 96 | |
| Morgan-Keenan | B9V | source: 25 | |
| B-magnitude | 6.07 ±0.05 | B-V-magnitude | -0.06 |
| U-magnitude | 5.89 ±0.05 | U-B-magnitude | -0.18 |
double/multiple star system information:
| separation between brightest and second brightest component | 9.8 arcsec |
| magnitude difference between brightest and second brightest component | 7.6 |
| position angle | 178 ° |
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: 20h 25min 47.782sec | DEC: -3° 31' 27.17'' | ±0.022 arcsec |
| position (J2000) | RA: 20h 28min 24.858sec | DEC: -3° 21' 27.89'' | |
| proper motion B1950 (FK4) | RA: 0.0013 arcsec/a | DEC: -0.013 arcsec/a | ±0.004 arcsec/a in RA ±0.003 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0015 arcsec/a | DEC: -0.015 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 | B9 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | GC, catalogue number: 28472 |
| Durchmusterung | BD-03 4906 |
| Boss General Catalogue | 28472 |
| Henry Draper Catalogue | 194939 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 20h 28.4min | DEC: -3° 21' |
| proper motion (J2000) | RA: 0.035 arcsec/a | DEC: -0.019 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 |
| - | 1939 | 2 | 178° | 9.8'' | 6.13 | 13.7 | B9V | RST4667 |
discoverer information:
| discoverer code | discoverer | reference |
| RST4667 | Rossiter, R.A. | - |
notes:
| note | 68 Aql. |