HR 647
catalogues and names
| catalogues and names | HR 647, HD 13594, SAO 37878, BD +46 536, WDS 02140+4729 |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 2h 14min 2.6sec | DEC: +47° 29' 3'' | ||
| position (B1900) | RA: 2h 7min 37.7sec | DEC: +47° 1' 2'' | ||
| proper motion (J2000) | RA: -0.063 arcsec/a | DEC: -0.059 arcsec/a | ||
| radial velocity | -8 km/s note: variable radial velocity |
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| rotational velocity | <26 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0.036 arcsec | |||
| galactic coordinates | longitude: 137.1° | latitude: -13.1° | ||
| note (category: dynamical parallaxes): | 0.025". |
magnitude
| visual magnitude | 6.06 (V on UBV Johnson system) |
spectral / color information
| spectral class | F4V |
| B-V-magnitude | 0.4 |
| U-B-magnitude | -0.07 |
| R-I-magnitude |
double/multiple star system information
| separation | 1 arcsec |
| mag difference (of double or brightest multiple) | 0.6 |
| note (category: double and multiple data): | 6.6 F3V, 7.08 F6V, 144.7y, a = 0.908". Combined mag., colors. |
miscellaneous information
| note (category: group membership): | Sirius group; UMa stream. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 2h 14min 2.381sec | DEC: +47° 29' 3.04'' | ±0.43 arcsec | source: 16 |
| proper motion (J2000) | RA: -0.0079 arcsec/a | DEC: -0.057 arcsec/a | source: 25 | |
| radial velocity | -8 km/s | source: 25 | ||
| trigonometric parallax | 0.036 arcsec | ±0.004 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 137.1° | latitude: -13.1° | ||
magnitude:
| visual | 6.06 (observed) | source: 25 |
| photovisual | 6 | source: 2 |
| photographic | 6.3 | source: 16 |
spectral information:
| spectral class | F0 | source: 96 | |
| Morgan-Keenan | F4V | source: 25 | |
| B-magnitude | 6.46 ±0.05 | B-V-magnitude | 0.4 |
| U-magnitude | 6.39 ±0.05 | U-B-magnitude | -0.07 |
double/multiple star system information:
| magnitude difference between brightest and second brightest component | 0.9 |
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 | |
| 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: 2h 10min 49.476sec | DEC: +47° 15' 6.54'' | ±0.031 arcsec |
| position (J2000) | RA: 2h 14min 2.557sec | DEC: +47° 29' 2.88'' | |
| proper motion B1950 (FK4) | RA: -0.0062 arcsec/a | DEC: -0.055 arcsec/a | ±0.006 arcsec/a in RA ±0.004 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0.0062 arcsec/a | DEC: -0.059 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 6 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | F0 |
| 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: 2668 |
| Durchmusterung | BD+46 536 |
| Boss General Catalogue | 2668 |
| Henry Draper Catalogue | 13594 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 2h 14min | DEC: +47° 29' |
| proper motion (J2000) | RA: -0.074 arcsec/a | DEC: -0.061 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 |
| - | 1831 | often | ° | '' | 6.4 | 7.3 | F4V | STF 228 |
discoverer information:
| discoverer code | discoverer | reference |
| STF 228 | Struve, F.G.W. | - |
notes:
| note | P = 144yr., a = 0.91", motion direct. |
data from 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)
position:
| position (B1900) | RA: 2h 7.6min | DEC: +47° 1' |
magnitudes, spectral classes, orbital elements:
| author: | W.D. Heintz |
| date of observation: | 1952 |
| magnitude of component A: | 6.6 |
| magnitude of component B: | 6.6 |
| spectral class component B: | F4V |
| spectral class component B: | F4V |
| period [y]: | 144.7 |
| semi-major axis [arcsec]: | 0.908 |
| inclination [deg]: | 63.4 |
| node [deg]: | 97.6 |
| equinox of node: | 1900 |
| eccentricity: | 0.26 |
| time of periastron passage: | 1898.2 |
| dates of ephemeris: | 1954-1980 |
| grade: | good |
| reference: | Mon. Not. R. Astron. Soc. 114, 604; 1954. |
| other name(s) | STF 228 |