71 Aquilae
catalogues and names
| catalogues and names | NSV 13187, 71 Aql, HR 7884, HD 196574, SAO 144649, BD -1 4016, WDS 20383-0106 |
| constellation | Aquila |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 20h 38min 20.3sec | DEC: -1° 6' 19'' | ||
| position (B1900) | RA: 20h 33min 10.4sec | DEC: -1° 27' 17'' | ||
| proper motion (J2000) | RA: 0.015 arcsec/a | DEC: -0.022 arcsec/a | ||
| radial velocity | -6 km/s note: spectroscopic binaries, single lined spectra note: orbital data avaible |
|||
| rotational velocity | <19 km/s | |||
| trigonometric parallax | 0.01 arcsec | |||
| galactic coordinates | longitude: 44.81° | latitude: -24.14° | ||
magnitude
| visual magnitude | 4.32 (V on UBV Johnson system) |
spectral / color information
| spectral class | G7.5IIIa |
| B-V-magnitude | 0.95 |
| U-B-magnitude | 0.69 |
| R-I-magnitude | |
| IR-note | object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978) |
variability information
| variable star identification | 13187 |
double/multiple star system information
| separation | 32.2 arcsec |
| mag difference (of double or brightest multiple) | 7.5 |
| note (category: double and multiple data): | Optical. |
| note (category: spectroscopic binaries): | ADS 14081A, 205.2d, K 9.8k/s, V0 -5.9k/s, asini 27.7. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 20h 38min 20.274sec | DEC: -1° 6' 18.19'' | ±0.2 arcsec | source: 52 |
| proper motion (J2000) | RA: 0.0011 arcsec/a | DEC: -0.014 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: 44.82° | latitude: -24.14° | ||
magnitude:
| visual | 4.32 (observed) | source: 25 |
| photovisual | 4.5 | source: 2 |
| photographic | 5.4 | source: 16 |
spectral information:
| spectral class | K0 | source: 96 | |
| Morgan-Keenan | G7.5IIIa | source: 25 | |
| B-magnitude | 5.27 ±0.05 | B-V-magnitude | 0.95 |
| U-magnitude | 5.96 ±0.05 | U-B-magnitude | 0.69 |
double/multiple star system information:
| separation between brightest and second brightest component | 32.2 arcsec |
| magnitude difference between brightest and second brightest component | 6.7 |
| position angle | 281 ° |
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: 20h 35min 45.349sec | DEC: -1° 16' 51.96'' | ±0.019 arcsec |
| position (J2000) | RA: 20h 38min 20.258sec | DEC: -1° 6' 18.77'' | |
| proper motion B1950 (FK4) | RA: 0.0008 arcsec/a | DEC: -0.019 arcsec/a | ±0.003 arcsec/a in RA ±0.003 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.001 arcsec/a | DEC: -0.022 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4.5 (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: 28725 |
| Durchmusterung | BD-01 4016 |
| Boss General Catalogue | 28725 |
| Henry Draper Catalogue | 196574 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 20h 38.3min | DEC: -1° 6' |
| proper motion (J2000) | RA: 0.024 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 |
| - | 1878 | 6 | 281° | 30.5'' | 4.32 | 11 | G8III | BU 672 |
| 1914 | - | 32.2'' |
discoverer information:
| discoverer code | discoverer | reference |
| BU 672 | Burnham, S.W. | - |
notes:
| note | 71 Aql. A is a long-period spectroscopic binary. |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 20h 35min 45.3sec | DEC: -1° 16' 52'' |
variability informations:
| magnitute at max. brightness | 4.3 |
| magnitute at min. brightness | 4.33 |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | G8 |
references
| to a study | 0807D (designation: 146G AQL) |
miscanellous
| There are notes in the published catalog (Kukarkin et al.(1982)). |