t Persei
catalogues and names
| catalogues and names | t Per, tau Per, 18 Per, HR 854, HD 17878, SAO 23685, BD +52 641, FK5: 103, WDS 02543+5246A |
| constellation | Perseus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 2h 54min 15.5sec | DEC: +52° 45' 45'' | ||
| position (2000.73) | RA: 2h 54min 19sec | DEC: +52° 45' 56'' | ||
| position (B1900) | RA: 2h 47min 9.8sec | DEC: +52° 21' 12'' | ||
| proper motion (J2000) | RA: 0 arcsec/a | DEC: -0.005 arcsec/a | ||
| radial velocity | 2 km/s note: spectroscopic binaries, single lined spectra note: orbital data avaible |
|||
| rotational velocity | <25 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0.019 arcsec | |||
| galactic coordinates | longitude: 141.02° | latitude: -5.74° | ||
magnitude
| visual magnitude | 3.95 (V on UBV Johnson system) |
spectral / color information
| spectral class | G4III+A4V |
| B-V-magnitude | 0.74 |
| U-B-magnitude | 0.46 |
| R-I-magnitude | |
| IR-note | object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978) |
variability information
| variable star identification | Tau Per |
| note (category: variability): | EA, 3.94 - 4.07V. |
double/multiple star system information
| number of components of multiple star system | 4 |
| separation | 51.7 arcsec |
| mag difference (of double or brightest multiple) | 8.6 |
| component ID | AxBC |
| note (category: double and multiple data): | A* 4.06 G4III+A4V, 4.150y, a = 0.050". Speckle interferometric sep. 0.080" 1981.67. Circumstellar material surrounding the pair? Visual companions 10.7v at 51" possibly physical; 11.8v at 4" possibly optical. |
| note (category: spectroscopic binaries): | ADS 2202A, 1515.6d, K 19.0k/s, V0 +2.2k/s, asini 271. vsini of secondary 50k/s. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 2h 54min 15.457sec | DEC: +52° 45' 44.95'' | ±0.06 arcsec | source: 15 |
| position (2000.73) | RA: 2h 54min 18sec | DEC: +52° 45' 56'' | JD: 2451810.11 | |
| proper motion (J2000) | RA: 0 arcsec/a | DEC: -0.005 arcsec/a | source: 25 | |
| radial velocity | 2 km/s | source: 25 | ||
| trigonometric parallax | 0.019 arcsec | ±0.002 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 141.03° | latitude: -5.74° | ||
magnitude:
| visual | 3.95 (observed) | source: 25 |
| photovisual | 4.1 | source: 2 |
spectral information:
| spectral class | G0 | source: 96 | |
| Morgan-Keenan | G4III+A4V | source: 25 | |
| B-magnitude | 4.69 ±0.05 | B-V-magnitude | 0.74 |
| U-magnitude | 5.15 ±0.05 | U-B-magnitude | 0.46 |
variability information:
| variability type | 310 |
| var. amplitude | 0.2 |
double/multiple star system information:
| separation between brightest and second brightest component | 51.7 arcsec |
| magnitude difference between brightest and second brightest component | 6.7 |
| position angle | 106 ° |
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 | |
| 27 | Catalog of Red Magnitudes (CRM) |
| Warren, W.H. Jr., Northern Hemisphere Catalog of Red Magnitudes, 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 (B1950) | RA: 2h 50min 41.856sec | DEC: +52° 33' 33.9'' | ±0.004 arcsec |
| position (2000.73) | RA: 2h 54min 19sec | DEC: +52° 45' 56'' | JD: 2451810.11 |
| position (J2000) | RA: 2h 54min 15.457sec | DEC: +52° 45' 45.03'' | |
| proper motion B1950 (FK4) | RA: 0 arcsec/a | DEC: -0.001 arcsec/a | ±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0 arcsec/a | DEC: -0.004 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4.1 (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: 103 |
| Durchmusterung | BD+52 641 |
| Boss General Catalogue | 3462 |
| Henry Draper Catalogue | 17878 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 2h 54.3min | DEC: +52° 46' |
| 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 | 1976 | 10 | 282° | 0'' | 3.95 | - | G4III+A4V | LAB |
| 1990 | 277° | 0.1'' | ||||||
| Aa-B | 1878 | 6 | 106° | 50.7'' | 4 | 10.7 | G4III+A4V | EDG 1 |
| 1925 | - | 51.7'' | ||||||
| Aa-C | 1878 | 1 | 75° | 4'' | - | - | - | BU 1376 |
| BC | 1900 | 2 | 82° | 4.6'' | 10.7 | 11.8 | - | BU 1376 |
| 1925 | 87° | 3.5'' |
discoverer information:
| discoverer code | discoverer | reference |
| LAB | Labeyrie et al | |
| EDG 1 | - | - |
| BU 1376 | Burnham, S.W. | - |
notes:
| note | Tau Per. Spectrum composite; G4III+A4V. A is a long- period spectroscopic binary, resolved by speckle interferometry. The 52" distant double companion may be physical. |
data from 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)
position:
| position (B1900) | RA: 2h 47.2min | DEC: +52° 21' |
magnitudes, spectral classes, orbital elements:
| author: | H.A. McAlister |
| magnitude of component A: | 3.9 |
| magnitude of component B: | 3.9 |
| spectral class component B: | G4III |
| spectral class component B: | G4III |
| period [y]: | 4.15 |
| semi-major axis [arcsec]: | 0.05 |
| inclination [deg]: | 95 |
| node [deg]: | 101 |
| eccentricity: | 0.73 |
| time of periastron passage: | 1976.535 |
| grade: | good |
| reference: | Astron. J. 86, 1397; 1981. |
| notes | Single-lined spectroscopic binary; the elements P, T, e, and the longitude of periastron are from the orbit by Colacevich (1941). Speckle observations have resolved the pair and invalidate an astrometric solution (van de Kamp, Astron. J. 74, 235; 1969). The 52" distant, visual double companion (mags. 11 and 12, 3.5") may be physical. |