t Ursae Majoris
catalogues and names
| catalogues and names | t UMa, NSV 18142, 14 UMa, HR 3624, HD 78362, SAO 14796, BD +64 723, FK5: 2727, WDS 09109+6331A |
| constellation | Ursa Major |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 9h 10min 55.1sec | DEC: +63° 30' 49'' | ||
| position (B1900) | RA: 9h 2min 40.6sec | DEC: +63° 55' 14'' | ||
| proper motion (J2000) | RA: 0.098 arcsec/a | DEC: -0.056 arcsec/a | ||
| radial velocity | -9 km/s note: spectroscopic binaries note: orbital data avaible |
|||
| rotational velocity | 18 km/s (uncertain) (variable) | |||
| galactic coordinates | longitude: 151.21° | latitude: 39.42° | ||
magnitude
| visual magnitude | 4.67 (V on UBV Johnson system) |
spectral / color information
| spectral class | F3-4IIIm vs |
| B-V-magnitude | 0.35 |
| U-B-magnitude | 0.15 |
| R-I-magnitude |
| note (category: spectra): | Violet part of spectrum indicates luminosity III; G-band region, IV-V. |
double/multiple star system information
| number of components of multiple star system | 3 |
| separation | 57.2 arcsec |
| mag difference (of double or brightest multiple) | 6.2 |
| component ID | AB |
| note (category: double and multiple data): | B, optical. |
| note (category: spectroscopic binaries): | ADS 7211A, 1062.4d, K 3.9k/s, V0 -8.7k/s, asini 50.0. Unresolved by speckle interferometry. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 9h 10min 55.057sec | DEC: +63° 30' 49.34'' | ±0.22 arcsec | source: 15 |
| proper motion (J2000) | RA: 0.0146 arcsec/a | DEC: -0.056 arcsec/a | source: 25 | |
| radial velocity | -9 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 151.21° | latitude: 39.42° | ||
magnitude:
| visual | 4.67 (observed) | source: 25 |
| photovisual | 4.7 | source: 2 |
spectral information:
| spectral class | F5 | source: 96 | |
| Morgan-Keenan | F3-4IIImvs | source: 25 | |
| B-magnitude | 5.02 ±0.05 | B-V-magnitude | 0.35 |
| U-magnitude | 5.17 ±0.05 | U-B-magnitude | 0.15 |
double/multiple star system information:
| separation between brightest and second brightest component | 57.2 arcsec |
| magnitude difference between brightest and second brightest component | 5.6 |
| position angle | 49 ° |
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 (B1950) | RA: 9h 6min 49.121sec | DEC: +63° 43' 7.21'' | ±0.014 arcsec |
| position (J2000) | RA: 9h 10min 55.077sec | DEC: +63° 30' 48.67'' | |
| proper motion B1950 (FK4) | RA: 0.0149 arcsec/a | DEC: -0.065 arcsec/a | ±0.003 arcsec/a in RA ±0.002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0.0148 arcsec/a | DEC: -0.063 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4.7 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | +++ |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
remarks for duplicity and variability
| Double star in Aitken's Double Star Catalogue (Aitken 1932) |
catalogues
| source catalogue | GC, catalogue number: 12646 |
| Durchmusterung | BD+64 723 |
| Boss General Catalogue | 12646 |
| Henry Draper Catalogue | 78362 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 9h 10.9min | DEC: +63° 31' |
| proper motion (J2000) | RA: 0.098 arcsec/a | DEC: -0.056 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 |
| - | 1899 | 3 | 49° | 57.2'' | 4.67 | 10.3 | Am | H 73 |
discoverer information:
| discoverer code | discoverer | reference |
| H 73 | Herschel, W. | - |
notes:
| note | H V 73. Tau UMa. A is a metallic-line star and long- period spectroscopic binary. |