70 Herculis
catalogues and names
| catalogues and names | 70 Her, HR 6457, HD 157198, SAO 85021, BD +24 3167, WDS 17209+2430A |
| constellation | Hercules |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 17h 20min 54.2sec | DEC: +24° 29' 58'' | ||
| position (B1900) | RA: 17h 16min 47sec | DEC: +24° 35' 56'' | ||
| proper motion (J2000) | RA: -0.022 arcsec/a | DEC: 0.002 arcsec/a | ||
| radial velocity | -18 km/s note: spectroscopic binaries |
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| rotational velocity | 99 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0.01 arcsec | |||
| galactic coordinates | longitude: 46.93° | latitude: 30.05° | ||
magnitude
| visual magnitude | 5.12 (V on UBV Johnson system) |
spectral / color information
| spectral class | A2V |
| B-V-magnitude | -0.03 |
| U-B-magnitude | 0.02 |
double/multiple star system information
| number of components of multiple star system | 3 |
| separation | 222.9 arcsec |
| mag difference (of double or brightest multiple) | 3.5 |
| component ID | AB |
| note | Worley (1978) update of the IDS |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 17h 20min 54.222sec | DEC: +24° 29' 57.88'' | ±0.35 arcsec | source: 17 |
| proper motion (J2000) | RA: -0.0012 arcsec/a | DEC: -0.002 arcsec/a | source: 25 | |
| radial velocity | -18 km/s | source: 25 | ||
| trigonometric parallax | 0.01 arcsec | ±0.001 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 46.93° | latitude: 30.05° | ||
magnitude:
| visual | 5.12 (observed) | source: 25 |
| photovisual | 5.1 | source: 2 |
| photographic | 5.1 | source: 16 |
spectral information:
| spectral class | A0 | source: 96 | |
| Morgan-Keenan | A2V | source: 25 | |
| B-magnitude | 5.09 ±0.05 | B-V-magnitude | -0.03 |
| U-magnitude | 5.11 ±0.05 | U-B-magnitude | 0.02 |
double/multiple star system information:
| separation between brightest and second brightest component | 222.6 arcsec |
| magnitude difference between brightest and second brightest component | 3.5 |
| position angle | 56 ° |
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 | |
| 17 | ACRS |
| Corbin, T.E., and S.E. Urban, Astrographic Catalog Reference Stars, United States Naval Observatory, 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 | |
| 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: 17h 18min 50.498sec | DEC: +24° 32' 52.75'' | ±0.019 arcsec |
| position (J2000) | RA: 17h 20min 54.184sec | DEC: +24° 29' 58.29'' | |
| proper motion B1950 (FK4) | RA: -0.0017 arcsec/a | DEC: 0.001 arcsec/a | ±0.003 arcsec/a in RA ±0.003 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0.0016 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 | A0 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | GC, catalogue number: 23447 |
| Durchmusterung | BD+24 3167 |
| Boss General Catalogue | 23447 |
| Henry Draper Catalogue | 157198 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 17h 20.9min | DEC: +24° 30' |
| proper motion (J2000) | RA: -0.016 arcsec/a | DEC: -0.002 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 |
| AB | 1879 | 6 | 56° | 220.7'' | 5.12 | 8.6 | A2V | S 687 |
| 1982 | - | 222.6'' | ||||||
| AC | 1910 | 2 | 20° | 239.2'' | 5.12 | 11.8 | - | S 687 |
| 1982 | 29° | 550.8'' | ||||||
| BC | 1911 | 1 | 315° | 146.7'' | 8.6 | 11.8 | - | S 687 |
discoverer information:
| discoverer code | discoverer | reference |
| S 687 | South, J. | - |
notes:
| note | 70 Her. A is a spectroscopic binary. |