g Persei
| catalogues and names | g Per, gam Per, 23 Per, HR 915, HD 18925, SAO 23789, FK5: 108, WDS 03048+5330A |
| constellation | Perseus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 3h 4min 47,8sec | DEC: +53° 30' 23'' |
| position (J1900) | RA: 2h 57min 32,9sec | DEC: +53° 6' 54'' |
| proper motion (J2000) | RA: 0 arcsec/a | DEC: -0,005 arcsec/a |
| radial velocity | 3 km/s note: spectroscopic binaries, double lined spectra note: orbital data avaible |
|
| rotational velocity | =<50 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,016 arcsec | |
magnitude
| visual magnitude | 2,93 (V on UBV Johnson system) |
spectral / color information
| spectral class | G8III+A2V |
| B-V-magnitude | 0,7 |
| U-B-magnitude | 0,45 |
| R-I-magnitude | 0,45 |
double/multiple star system information
| number of components of multiple star system | 3 |
| separation | 57 arcsec |
| mag difference (of double or brightest multiple) | 8,6 |
| component ID | AB |
| note (category: double and multiple data): | SKYLAB observations indicate cool star with hot companion. Components Aa, 14.65y, a = 0.159". Physical nature of B, 11m at 57", uncertain. |
| note (category: spectroscopic binaries): | 5350d, K 12.7 or 21.9k/s, V0 +2.5k/s, msin3i 4.87, asini 648. vsini of secondary 50k/s. Resolved by speckle interferometry 1981.67, sep. 0.284", 1983.93, sep. 0.27". |
miscellaneous information
| note (category: miscellaneous): | Close to error box of X-ray source 3U0305+53. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 3h 4min 47,791sec | DEC: +53° 30' 23,29'' | ±0,06 arcsec | source: 15 |
| proper motion (J2000) | RA: 0 arcsec/a | DEC: -0,005 arcsec/a | source: 25 | |
| radial velocity | 3 km/s | source: 25 | ||
| trigonometric parallax | 0,016 | ±0,002 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 142,07° | latitude: -4,34° | ||
| GCI unit vector (J2000) | X: 0,411646 | Y: 0,429248 | Z: 0,803924 | |
magnitude:
| visual | 2,93 (observed) | source: 25 |
| photovisual | 3,1 | source: 2 |
spectral information:
| spectral class | F5 | source: 96 | |
| Morgan-Keenan | G8III+A2V | source: 25 | |
| B-magnitude | 3,63 ±0,05 | B-V-magnitude | 0,7 |
| U-magnitude | 4,08 ±0,05 | U-B-magnitude | 0,45 |
double/multiple star system information:
| separation between brightest and second brightest component | 57 arcsec |
| magnitude difference between brightest and second brightest component | 7,7 |
| position angle | 326 ° |
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: 3h 1min 9,595sec | DEC: +53° 18' 44,29'' | ±0,004 arcsec |
| position (J2000) | RA: 3h 4min 47,788sec | DEC: +53° 30' 23,24'' | |
| proper motion J1950 (FK4) | RA: 0 arcsec/a | DEC: -0,002 arcsec/a | ±0,001 arcsec/a in RA ±0,001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0,0001 arcsec/a | DEC: -0,005 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 3,1 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
| spectral class | +++ |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | FK4, catalogue number: 108 |
| Durchmusterung | BD+52 654 |
| Boss General Catalogue | 3664 |
| Henry Draper Catalogue | 18925 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 3h 4,8min | DEC: +53° 30' |
| proper motion (J2000) | RA: 0 arcsec/a | DEC: -0,005 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 |
| Aa | 1939 | 21 | 49° | 0,1'' | 2,93 | - | G8III+A2V | WRH |
| 1993 | 69° | - | ||||||
| Aa-B | 1879 | 4 | 324° | 57,7'' | 3,1 | 10,8 | G8III+A2V | HJ 2170 |
| 1938 | 326° | 57'' |
discoverer information:
| discoverer code | discoverer | reference |
| WRH | Wilson, R.H. | |
| HJ 2170 | Herschel, J. | - |
notes:
| note | Gamma Per. Also a spectroscopic binary. Spectrum composite; G8III+A2V. Now resolved by speckle interferometry. B, at 57", is uncertainly physical. |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (J1950) | RA: 3h 1min 9,6sec | DEC: +53° 18' 44'' |
variability informations:
| variability type | EA/GS | close binary eclipsing system |
| magnitute at max. brightness | 3,63 | |
| magnitute amplitude | 0,55 | |
| photometric system |
references
| to a study | R.F.Griffin, S&T 81, No.6, 598, 1991. |
| to a chart/photograph | no chart is avaible, but the star is contained in the 'Bonner Durchmusterung' |
miscanellous
| ID in the GCVS catalogue | 63/9003 |
| constellation | Perseus |
| notes on existence | The star is equivalent to '71055'. |
variability type description
| variability type | description |
| EA | Eclipsing binary systems. These are binary systems with orbital planes so close to the observer's line of sight (the inclination i of the orbital plane to the plane orthogonal to the line of sight is close to 90 deg) that the components periodically eclipse each other. Consequently, the observer finds changes of the apparent combined brightness of the system with the period coincident with that of the components' orbital motion. EA Algol (Beta Persei)-type eclipsing systems. Binaries with spherical or slightly ellipsoidal components. It is possible to specify, for their light curves, the moments of the beginning and end of the eclipses. Between eclipses the light remains almost constant or varies insignificantly because of reflection effects, slight ellipsoidality of components, or physical variations. Secondary minima may be absent. An extremely wide range of periods is observed, from 0.2 to >= 10000 days. Light amplitudes are also quite different and may reach several magnitudes. EB Beta Lyrae-type eclipsing systems. These are eclipsing systems having ellipsoidal components and light curves for which it is impossible to specify the exact times of onset and end of eclipses because of a continuous change of a system's apparent combined brightness between eclipses; secondary minimum is observed in all cases, its depth usually being considerably smaller than that of the primary minimum; periods are mainly longer than 1 day. The components generally belong to early spectral types (B-A). Light amplitudes are usually <2 mag in V. EW W Ursae Majoris-type eclipsing variables. These are eclipsers with periods shorter than 1 days, consisting of ellipsoidal components almost in contact and having light curves for which it is impossible to specify the exact times of onset and end of eclipses. The depths of the primary and secondary minima are almost equal or differ insignificantly. Light amplitudes are usually <0.8 mag in V. The components generally belong to spectral types F-G and later. |
| GS | Systems with one or both giant and supergiant components; one of the components may be a main sequence star. |