z Herculis
| catalogues and names | z Her, NSV 07915, 40 Her, HR 6212, HD 150680, SAO 65485, WDS 16413+3136 |
| constellation | Hercules |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 16h 41min 17,2sec | DEC: +31° 36' 11'' |
| position (J1900) | RA: 16h 37min 30,9sec | DEC: +31° 47' 1'' |
| proper motion (J2000) | RA: -0,47 arcsec/a | DEC: 0,394 arcsec/a |
| radial velocity | -70 km/s note: spectroscopic binaries, single lined spectra note: orbital data avaible |
|
| rotational velocity | =<10 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,102 arcsec | |
| note (category: dynamical parallaxes): | 0.096". |
magnitude
| visual magnitude | 2,81 (V on UBV Johnson system) |
spectral / color information
| spectral class | G0IV |
| B-V-magnitude | 0,65 |
| U-B-magnitude | 0,21 |
| R-I-magnitude | 0,32 |
variability information
| variable star identification | 7915 |
| note (category: variability): | ADS 10157A is var. suspect NSV 7915. |
double/multiple star system information
| separation | 1,1 arcsec |
| mag difference (of double or brightest multiple) | 2,6 |
| note (category: double and multiple data): | ADS 10157AB, 2.90 F9IV, 5.53 G7V, 34.49y, a = 1.355". ADS 10157A*, 10.5y, a = 0.08". |
| note (category: spectroscopic binaries): | ADS 10157A, 34.417y D, K 3.8k/s, V0 -69.9k/s, asini 590. Resolved by speckle interferometry. |
miscellaneous information
| note (category: group membership): | Zeta Her group. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 16h 41min 17,156sec | DEC: +31° 36' 10,36'' | ±0,43 arcsec | source: 16 |
| proper motion (J2000) | RA: -0,038 arcsec/a | DEC: 0,387 arcsec/a | source: 25 | |
| radial velocity | -70 km/s | source: 25 | ||
| trigonometric parallax | 0,102 | ±0,01 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 52,65° | latitude: 40,28° | ||
| GCI unit vector (J2000) | X: -0,286804 | Y: -0,801959 | Z: 0,524029 | |
magnitude:
| visual | 2,81 (observed) | source: 25 |
| photovisual | 3 | source: 2 |
| photographic | 3,6 | source: 16 |
spectral information:
| spectral class | G0 | source: 96 | |
| Morgan-Keenan | G0IV | source: 25 | |
| B-magnitude | 3,46 ±0,05 | B-V-magnitude | 0,65 |
| U-magnitude | 3,67 ±0,05 | U-B-magnitude | 0,21 |
double/multiple star system information:
| magnitude difference between brightest and second brightest component | 3,5 |
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 (J1950) | RA: 16h 39min 23,987sec | DEC: +31° 41' 32,12'' | ±0,008 arcsec |
| position (J2000) | RA: 16h 41min 17,216sec | DEC: +31° 36' 10,6'' | |
| proper motion J1950 (FK4) | RA: -0,0369 arcsec/a | DEC: 0,394 arcsec/a | ±0,001 arcsec/a in RA ±0,001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0,0368 arcsec/a | DEC: 0,394 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 3 (accuracy: 2 decimals) |
| source of visual magnitude data | Combined magnitude of component stars. |
spectral information:
| spectral class | G0 |
| source of spectral data | Taken from the HD with M stars reclassified by Miss Cannon. |
remarks for duplicity and variability
| Double star - see source catalog for source |
catalogues
| source catalogue | FK3, catalogue number: 1634 |
| Durchmusterung | BD+31 2884 |
| Boss General Catalogue | 22464 |
| Henry Draper Catalogue | 150680 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 16h 41,3min | DEC: +31° 36' |
| proper motion (J2000) | RA: -0,468 arcsec/a | DEC: 0,388 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 |
| - | 1826 | often | ° | '' | 3 | 6,5 | G1IV | STF2084 |
discoverer information:
| discoverer code | discoverer | reference |
| STF2084 | Struve, F.G.W. | - |
notes:
| note | Zeta Her. P = 34.5yr., a = 1.36", motion retrograde. |
data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)
position:
| position (J1950) | RA: 16h 39min 24sec | DEC: +31° 41' 32'' |
variability informations:
| magnitute at max. brightness | 2,78 |
| magnitute at min. brightness | 2,85 |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | * |
references
| to a study | 182615D (designation: zeta HER) |
miscanellous
| There are notes in the published catalog (Kukarkin et al.(1982)). |