g Herculis
| catalogues and names | g Her, gam Her, 20 Her, HR 6095, HD 147547, SAO 102107, FK5: 609, WDS 16219+1909A |
| constellation | Hercules |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 16h 21min 55,2sec | DEC: +19° 9' 11'' |
| position (J1900) | RA: 16h 17min 30,4sec | DEC: +19° 23' 16'' |
| proper motion (J2000) | RA: -0,047 arcsec/a | DEC: 0,043 arcsec/a |
| radial velocity | -35 km/s note: spectroscopic binaries |
|
| rotational velocity | 141 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,024 arcsec | |
magnitude
| visual magnitude | 3,75 (V on UBV Johnson system) |
spectral / color information
| spectral class | A9III |
| B-V-magnitude | 0,27 |
| U-B-magnitude | 0,18 |
| R-I-magnitude | 0,14 |
variability information
| variable star identification | 7667 |
double/multiple star system information
| number of components of multiple star system | 3 |
| separation | 41,6 arcsec |
| mag difference (of double or brightest multiple) | 6,4 |
| component ID | AB |
| note (category: double and multiple data): | ADS 10022B, 9.58v, optical. |
| note (category: spectroscopic binaries): | 11.9d. |
miscellaneous information
| note (category: group membership): | Hyades group. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 16h 21min 55,216sec | DEC: +19° 9' 11,2'' | ±0,06 arcsec | source: 15 |
| proper motion (J2000) | RA: -0,0033 arcsec/a | DEC: 0,043 arcsec/a | source: 25 | |
| radial velocity | -35 km/s | source: 25 | ||
| trigonometric parallax | 0,024 | ±0,002 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 35,26° | latitude: 41,3° | ||
| GCI unit vector (J2000) | X: -0,392037 | Y: -0,859454 | Z: 0,328094 | |
magnitude:
| visual | 3,75 (observed) | source: 25 |
| photovisual | 3,8 | source: 2 |
spectral information:
| spectral class | F0 | source: 96 | |
| Morgan-Keenan | A9III | source: 25 | |
| B-magnitude | 4,02 ±0,05 | B-V-magnitude | 0,27 |
| U-magnitude | 4,2 ±0,05 | U-B-magnitude | 0,18 |
double/multiple star system information:
| separation between brightest and second brightest component | 41,6 arcsec |
| magnitude difference between brightest and second brightest component | 5,83 |
| position angle | 233 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 3,75 | F0 | g Herculis, 20 Her, HR 6095, HD 147547, SAO 102107 |
| B | 9,59 | - |
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 | |
| 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 19min 42,737sec | DEC: +19° 16' 9,32'' | ±0,004 arcsec |
| position (J2000) | RA: 16h 21min 55,217sec | DEC: +19° 9' 11,33'' | |
| proper motion J1950 (FK4) | RA: -0,0033 arcsec/a | DEC: 0,042 arcsec/a | ±0,001 arcsec/a in RA ±0,001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0,0033 arcsec/a | DEC: 0,045 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 3,8 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
| spectral class | F0 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | FK4, catalogue number: 609 |
| Durchmusterung | BD+19 3086 |
| Boss General Catalogue | 22012 |
| Henry Draper Catalogue | 147547 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 16h 21,9min | DEC: +19° 9' |
| proper motion (J2000) | RA: -0,047 arcsec/a | DEC: 0,043 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 | 1821 | 29 | 244° | 38,3'' | 3,75 | 9,58 | A9III | SHJ 227 |
| 1938 | 233° | 41,6'' | ||||||
| BC | 1910 | 1 | 298° | 84,7'' | 9,8 | 12,2 | - | SHJ 227 |
discoverer information:
| discoverer code | discoverer | reference |
| SHJ 227 | South & Herschel | - |
notes:
| note | Gamma Her. A is a spectroscopic binary. B is BD+19@2085. Proper motion of B -035 -041. |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (J1950) | RA: 16h 19min 42,7sec | DEC: +19° 16' 9'' |
variability informations:
| variability type | SRD: | pulsating variable star |
| magnitute at max. brightness | 4,02 | |
| magnitute amplitude | 0,09 | |
| photometric system |
references
| to a study | G.A.Bakos, J.Tremko, Skalnate Pleso Contr 21, 7, 1991. |
| to a chart/photograph | no chart is avaible, but the star is contained in the 'Bonner Durchmusterung' |
miscanellous
| ID in the GCVS catalogue | 40/9003 |
| constellation | Hercules |
| notes on existence | The star is equivalent to '71247'. |
variability type description
| variability type | description |
| SRD | Semiregular variables, which are giants or supergiants of intermediate and late spectral types showing noticeable periodicity in their light changes, accompanied or sometimes interrupted by various irregularities. Periods lie in the range from 20 to >2000 days, while the shapes of the light curves are rather different and variable, and the amplitudes may be from several hundredths to several magnitudes (usually 1-2 mag in V). SRA Semiregular late-type (M, C, S or Me, Ce, Se) giants displaying persistent periodicity and usually small (<2.5 mag in V) light amplitudes (Z Aqr). Amplitudes and light-curve shapes generally vary and periods are in the range of 35-1200 days. Many of these stars differ from Miras only by showing smaller light amplitudes; SRB Semiregular late-type (M, C, S or Me, Ce, Se) giants with poorly defined periodicity (mean cycles in the range of 20 to 2300 days) or with alternating intervals of periodic and slow irregular changes, and even with light constancy intervals (RR CrB, AF Cyg). Every star of this type may usually be assigned a certain mean period (cycle), which is the value given in the Catalogue. In a number of cases, the simultaneous presence of two or more periods of light variation is observed; SRC Semiregular late-type (M, C, S or Me, Ce, Se) supergiants (Mu Cep) with amplitudes of about 1 mag and periods of light variation from 30 days to several thousand days; SRD Semiregular variable giants and supergiants of F, G, or K spectral types, sometimes with emission lines in their spectra. Amplitudes of light variation are in the range from 0.1 to 4 mag, and the range of periods is from 30 to 1100 days (SX Her, SV UMa). |