d Persei
| catalogues and names | d Per, del Per, 39 Per, HR 1122, HD 22928, SAO 39053, FK5: 131, WDS 03429+4747 |
| constellation | Perseus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 3h 42min 55,5sec | DEC: +47° 47' 15'' |
| position (J1900) | RA: 3h 35min 48,1sec | DEC: +47° 28' 4'' |
| proper motion (J2000) | RA: 0,028 arcsec/a | DEC: -0,034 arcsec/a |
| radial velocity | 4 km/s note: spectroscopic binaries |
|
| rotational velocity | 259 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,016 arcsec | |
magnitude
| visual magnitude | 3,01 (V on UBV Johnson system) |
spectral / color information
| spectral class | B5IIIe |
| B-V-magnitude | -0,13 |
| U-B-magnitude | -0,51 |
| R-I-magnitude | -0,11 |
| note (category: spectra): | C1 neutral carbon continuum shows discontinuities in UV. Lyman alpha observed from COPERNICUS. |
| note (category: colors): | Color excess E(B-V) = +0.04. |
variability information
| variable star identification | Del Per |
| note (category: variability): | Alpha CV? 2.98 - 3.03V, about 1d. Strong variable emission at 1650A, CaII? |
double/multiple star system information
| separation | 99,1 arcsec |
| mag difference (of double or brightest multiple) | 7,3 |
| note | Worley (1978) update of the IDS |
miscellaneous information
| note (category: group membership): | Per OB3. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 3h 42min 55,497sec | DEC: +47° 47' 15,3'' | ±0,06 arcsec | source: 15 |
| proper motion (J2000) | RA: 0,0028 arcsec/a | DEC: -0,034 arcsec/a | source: 25 | |
| radial velocity | 4 km/s | source: 25 | ||
| trigonometric parallax | 0,016 | ±0,002 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 150,29° | latitude: -5,77° | ||
| GCI unit vector (J2000) | X: 0,37832 | Y: 0,555246 | Z: 0,740659 | |
magnitude:
| visual | 3,01 (observed) | source: 25 |
| photovisual | 3,1 | source: 2 |
spectral information:
| spectral class | B5 | source: 96 | |
| Morgan-Keenan | B5IIIe | source: 25 | |
| B-magnitude | 2,88 ±0,05 | B-V-magnitude | -0,13 |
| U-magnitude | 2,37 ±0,05 | U-B-magnitude | -0,51 |
variability information:
| variability type | 264 |
| var. amplitude | 0,05 |
double/multiple star system information:
| separation between brightest and second brightest component | 100 arcsec |
| magnitude difference between brightest and second brightest component | 7,4 |
| position angle | 313 ° |
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 | |
| 30 | GCVS, 4th edition |
| Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88 | |
| 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 39min 21,241sec | DEC: +47° 37' 46,34'' | ±0,004 arcsec |
| position (J2000) | RA: 3h 42min 55,49sec | DEC: +47° 47' 15,21'' | |
| proper motion J1950 (FK4) | RA: 0,0028 arcsec/a | DEC: -0,032 arcsec/a | ±0,001 arcsec/a in RA ±0,001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,0027 arcsec/a | DEC: -0,035 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 | B5 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | FK4, catalogue number: 131 |
| Durchmusterung | BD+47 876 |
| Boss General Catalogue | 4427 |
| Henry Draper Catalogue | 22928 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 3h 42,9min | DEC: +47° 47' |
| proper motion (J2000) | RA: 0,028 arcsec/a | DEC: -0,034 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 |
| - | 1879 | 3 | 313° | 97,4'' | 3,01 | 10,4 | B5III | BUP 46 |
| 1924 | - | 100'' |
discoverer information:
| discoverer code | discoverer | reference |
| BUP 46 | - | - |
notes:
| note | Delta Per. A possible variable of the Alpha CVn type. Proper motion of B -008 -005. |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (J1950) | RA: 3h 39min 21sec | DEC: +47° 37' 48'' | ± 1 sec / ± 0.1 arcmin |
variability informations:
| variability type | GCAS: | eruptive variable star |
| magnitute at max. brightness | 2,99 | |
| magnitute at min. brightness | 3,04 | |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | B5III |
references
| to a chart/photograph | no chart is avaible, but the star is contained in the 'Bonner Durchmusterung' |
miscanellous
| ID in the GCVS catalogue | 63/9004 |
| constellation | Perseus |
| notes on existence | The star is equivalent to '0639005 eps'. |
| There are notes in published catalog. | |
variability type description
| variability type | description |
| GCAS | Eruptive irregular variables of the Gamma Cas type. These are rapidly rotating B III-IVe stars with mass outflow from their equatorial zones. The formation of equatorial rings or disks is often accompanied by temporary fading. Light amplitudes may reach 1.5 mag in V. |