s2Ursae Majoris
catalogues and names
| catalogues and names | s2UMa, 13 UMa, HR 3616, HD 78154, SAO 14788, BD +67 577, WDS 09104+6708A |
| constellation | Ursa Major |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 9h 10min 23.2sec | DEC: +67° 8' 5'' | ||
| position (B1900) | RA: 9h 1min 35.8sec | DEC: +67° 32' 26'' | ||
| proper motion (J2000) | RA: -0.02 arcsec/a | DEC: -0.074 arcsec/a | ||
| radial velocity | -2 km/s | |||
| rotational velocity | 0 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0.056 arcsec | |||
| galactic coordinates | longitude: 146.87° | latitude: 38.11° | ||
| note (category: dynamical parallaxes): | 0.044". |
magnitude
| visual magnitude | 4.8 (V on UBV Johnson system) |
spectral / color information
| spectral class | F6IV |
| B-V-magnitude | 0.49 |
| U-B-magnitude | 0.02 |
| R-I-magnitude |
variability information
| variable star identification | 4392 |
| note (category: variability): | ADS 7203B, 7.5 - 10.0v? |
double/multiple star system information
| number of components of multiple star system | 3 |
| separation | 2.8 arcsec |
| mag difference (of double or brightest multiple) | 3.5 |
| component ID | AB |
| note (category: double and multiple data): | AB 4.85 F7IV-V, 8.16 K2V, 1067.1y, a = 6.20". C, probably optical. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 9h 10min 23.408sec | DEC: +67° 8' 2.14'' | ±0.35 arcsec | source: 17 |
| proper motion (J2000) | RA: -0.0007 arcsec/a | DEC: -0.1 arcsec/a | source: 25 | |
| radial velocity | -2 km/s | source: 25 | ||
| trigonometric parallax | 0.056 arcsec | ±0.006 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 146.88° | latitude: 38.11° | ||
magnitude:
| visual | 4.8 (observed) | source: 25 |
| photovisual | 4.9 | source: 2 |
| photographic | 5.4 | source: 16 |
spectral information:
| spectral class | F8 | source: 96 | |
| Morgan-Keenan | F6IV | source: 25 | |
| B-magnitude | 5.29 ±0.05 | B-V-magnitude | 0.49 |
| U-magnitude | 5.31 ±0.05 | U-B-magnitude | 0.02 |
double/multiple star system information:
| separation between brightest and second brightest component | 3.5 arcsec |
| magnitude difference between brightest and second brightest component | 3 |
| position angle | 359 ° |
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 | |
| 16 | PPM North and PPM South Catalogs and PPM Supplement |
| Roser, S., and U. Bastian, "Catalogue of Positions and Proper Motions," A&AS, Vol. 74, p. 449, 1988, and Bastian, U., et al., "Catalogue of Positions and Proper Motions - South," 1993 | |
| 17 | ACRS |
| Corbin, T.E., and S.E. Urban, Astrographic Catalog Reference Stars, United States Naval Observatory, 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 1.131sec | DEC: +67° 20' 21.67'' | ±0.008 arcsec |
| position (J2000) | RA: 9h 10min 23.177sec | DEC: +67° 8' 4.52'' | |
| proper motion B1950 (FK4) | RA: -0.0034 arcsec/a | DEC: -0.077 arcsec/a | ±0.002 arcsec/a in RA ±0.002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0.0035 arcsec/a | DEC: -0.074 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4.9 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
| spectral class | F8 |
| source of spectral data | Taken from the HD with M stars reclassified by Miss Cannon. |
catalogues
| source catalogue | FK3, catalogue number: 344 |
| Durchmusterung | BD+67 577 |
| Boss General Catalogue | 12619 |
| Henry Draper Catalogue | 78154 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 9h 10.4min | DEC: +67° 8' |
| proper motion (J2000) | RA: -0.004 arcsec/a | DEC: -0.1 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 |
| AB | 1819 | often | 267° | 6.3'' | 4.9 | 7.9 | F7V | STF1306 |
| 1988 | 359° | 3.5'' | ||||||
| AC | 1879 | 3 | 148° | 206.3'' | 4.9 | 9.3 | - | STF1306 |
| 1919 | - | 204.6'' |
discoverer information:
| discoverer code | discoverer | reference |
| STF1306 | Struve, F.G.W. | - |
notes:
| note | Sigma (2) UMa. P = 1140yr., a = 6.39", motion retrograde. |
data from 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)
position:
| position (B1900) | RA: 9h 1.6min | DEC: +67° 32' |
magnitudes, spectral classes, orbital elements:
| author: | P. Baize |
| date of observation: | 1947 |
| magnitude of component A: | 4.85 |
| magnitude of component B: | 4.85 |
| spectral class component B: | F6IV |
| spectral class component B: | F6IV |
| period [y]: | 1067.1 |
| semi-major axis [arcsec]: | 6.2 |
| inclination [deg]: | 146.2 |
| node [deg]: | 99.7 |
| equinox of node: | 1900 |
| eccentricity: | 0.814 |
| time of periastron passage: | 1917.7 |
| dates of ephemeris: | 1945-1970 |
| grade: | preliminary |
| reference: | J. Observateurs 31, 35; 1948. |
| other name(s) | STF 1306, 13 UMa |