Electra
| catalogues and names | Electra, NSV 15755, 17 Tau, HR 1142, HD 23302, SAO 76131, FK5: 136 |
| constellation | Taurus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
| note (category: star names): | Electra. |
position, motion, parallax:
| position (J2000) | RA: 3h 44min 52,5sec | DEC: +24° 6' 48'' |
| position (J1900) | RA: 3h 38min 56,1sec | DEC: +23° 47' 57'' |
| proper motion (J2000) | RA: 0,019 arcsec/a | DEC: -0,046 arcsec/a |
| radial velocity | 12 km/s note: spectroscopic binaries, single lined spectra note: orbital data avaible |
|
| rotational velocity | 215 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,02 arcsec | |
magnitude
| visual magnitude | 3,7 (V on UBV Johnson system) |
spectral / color information
| spectral class | B6III |
| B-V-magnitude | -0,11 |
| U-B-magnitude | -0,4 |
| R-I-magnitude | -0,1 |
double/multiple star system information
| separation | 0 arcsec |
| mag difference (of double or brightest multiple) | 2 |
| note | doublicity discoverd by occultation |
| note (category: double and multiple data): | Sep. 0.062". Occultation of 1972 Mar. 19 indicated mag. diff 3.4, sep. 0.010". |
| note (category: spectroscopic binaries): | 4.0, 6.0, sep. 0.002", 100.46d, K 26.0k/s, V0 -0.3k/s, asini 30.7. Unresolved by speckle interferometry. |
miscellaneous information
| note (category: group membership): | Pleiades cluster; Mel 22 #468; in reflection nebula; Pleiades nebula. Member assoc. Tau R1 at 110 pc. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 3h 44min 52,532sec | DEC: +24° 6' 48,01'' | ±0,06 arcsec | source: 15 |
| proper motion (J2000) | RA: 0,0014 arcsec/a | DEC: -0,046 arcsec/a | source: 25 | |
| radial velocity | 12 km/s | source: 25 | ||
| trigonometric parallax | 0,02 | ±0,002 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 166,19° | latitude: -23,85° | ||
| GCI unit vector (J2000) | X: 0,507503 | Y: 0,758639 | Z: 0,408543 | |
magnitude:
| visual | 3,7 (observed) | source: 25 |
| photovisual | 3,8 | source: 2 |
spectral information:
| spectral class | B5 | source: 96 | |
| Morgan-Keenan | B6III | source: 25 | |
| B-magnitude | 3,59 ±0,05 | B-V-magnitude | -0,11 |
| U-magnitude | 3,19 ±0,05 | U-B-magnitude | -0,4 |
double/multiple star system information:
| separation between brightest and second brightest component | 0 arcsec |
| magnitude difference between brightest and second brightest component | 2 |
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 | |
| 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 41min 54,055sec | DEC: +23° 57' 27,82'' | ±0,005 arcsec |
| position (J2000) | RA: 3h 44min 52,524sec | DEC: +24° 6' 48,15'' | |
| proper motion J1950 (FK4) | RA: 0,0014 arcsec/a | DEC: -0,042 arcsec/a | ±0,001 arcsec/a in RA ±0,001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,0013 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 | B5p |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | FK4, catalogue number: 136 |
| Durchmusterung | BD+23 507 |
| Boss General Catalogue | 4477 |
| Henry Draper Catalogue | 23302 |