g Coronae Borealis
catalogues and names
| catalogues and names | g CrB, gam CrB, 8 CrB, HR 5849, HD 140436, SAO 83958, BD +26 2722, WDS 15427+2618 |
| constellation | Corona Borealis |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 15h 42min 44.6sec | DEC: +26° 17' 44'' | ||
| position (2000.73) | RA: 15h 42min 47sec | DEC: +26° 17' 36'' | ||
| position (B1900) | RA: 15h 38min 32.5sec | DEC: +26° 36' 45'' | ||
| proper motion (J2000) | RA: -0.105 arcsec/a | DEC: 0.045 arcsec/a | ||
| radial velocity | -11 km/s | |||
| rotational velocity | 112 km/s (uncertain) (variable) | |||
| trigonometric parallax | 0.033 arcsec | |||
| galactic coordinates | longitude: 41.74° | latitude: 51.92° | ||
| note (category: dynamical parallaxes): | 0.018". |
magnitude
| visual magnitude | 3.84 (V on UBV Johnson system) |
spectral / color information
| spectral class | B9IV+A3V |
| B-V-magnitude | 0 |
| U-B-magnitude | -0.04 |
| R-I-magnitude |
variability information
| variable star identification | Gam CrB |
| note (category: variability): | Delta Sct 3.80-3.86V, 0.030d. Mass 1.9 solar. Possibly beat period? |
double/multiple star system information
| separation | 0.2 arcsec |
| mag difference (of double or brightest multiple) | 1.5 |
| note (category: double and multiple data): | 4.08 A0IV, 5.51 A3V, 91.0y, a = 0.74". Combined mag., color. |
| note (category: spectroscopic binaries): | ADS 9757A. |
miscellaneous information
| note (category: group membership): | Hyades group. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 15h 42min 44.61sec | DEC: +26° 17' 43.93'' | ±0.35 arcsec | source: 17 |
| position (2000.73) | RA: 15h 42min 47sec | DEC: +26° 17' 36'' | JD: 2451810.88 | |
| proper motion (J2000) | RA: -0.0074 arcsec/a | DEC: 0.044 arcsec/a | source: 25 | |
| radial velocity | -11 km/s | source: 25 | ||
| trigonometric parallax | 0.033 arcsec | ±0.003 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 41.74° | latitude: 51.92° | ||
magnitude:
| visual | 3.8 (observed) | source: 31 |
| photovisual | 3.9 | source: 2 |
| photographic | 3.9 | source: 16 |
spectral information:
| spectral class | A0 | source: 96 | |
| Morgan-Keenan | B9IV+A3V | source: 25 | |
| B-magnitude | 3.84 ±0.05 | B-V-magnitude | 0 |
| U-magnitude | 3.8 ±0.05 | U-B-magnitude | -0.04 |
variability information:
| variability type | 10 |
| var. amplitude | 0.06 |
| var. period | 0.03 |
double/multiple star system information:
| 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 | |
| 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 | |
| 30 | GCVS, 4th edition |
| Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88 | |
| 31 | CRM' (non-GCVS variable data) |
| 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: 15h 40min 38.464sec | DEC: +26° 27' 10.37'' | ±0.01 arcsec |
| position (2000.73) | RA: 15h 42min 46sec | DEC: +26° 17' 33'' | JD: 2451810.88 |
| position (J2000) | RA: 15h 42min 44.574sec | DEC: +26° 17' 43.93'' | |
| proper motion B1950 (FK4) | RA: -0.0079 arcsec/a | DEC: 0.043 arcsec/a | ±0.002 arcsec/a in RA ±0.002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0.0078 arcsec/a | DEC: 0.045 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 3.9 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
| spectral class | A0 |
| source of spectral data | Taken from the HD with M stars reclassified by Miss Cannon. |
catalogues
| source catalogue | FK3, catalogue number: 581 |
| Durchmusterung | BD+26 2722 |
| Boss General Catalogue | 21130 |
| Henry Draper Catalogue | 140436 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 15h 42.7min | DEC: +26° 18' |
| proper motion (J2000) | RA: -0.1 arcsec/a | DEC: 0.044 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 |
| - | 1826 | often | ° | '' | 4 | 6 | B9IV+A3V | STF1967 |
discoverer information:
| discoverer code | discoverer | reference |
| STF1967 | Struve, F.G.W. | - |
notes:
| note | Gamma CrB. P = 93yr., a = 0.73", motion retrograde, highly-inclined orbit. A is a Delta Scuti-type variable. |
data from 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)
position:
| position (B1900) | RA: 15h 38.6min | DEC: +26° 37' |
magnitudes, spectral classes, orbital elements:
| author: | P. Baize |
| date of observation: | 1952 |
| magnitude of component A: | 4.08 |
| magnitude of component B: | 4.08 |
| spectral class component B: | A0V |
| spectral class component B: | A0V |
| period [y]: | 91 |
| semi-major axis [arcsec]: | 0.74 |
| inclination [deg]: | 96 |
| node [deg]: | 111 |
| equinox of node: | 1900 |
| eccentricity: | 0.42 |
| time of periastron passage: | 1840.5 |
| dates of ephemeris: | 1952-1980 |
| grade: | good |
| reference: | J. Observateurs 36, 6; 1953. |
| notes | The primary is listed as a Delta Scuti type variable. The RV does not show a variation. A few discordant measurements seem to have been caused by scatter from the poor lines, and the double lines reported from three old Yerkes plates were also found probably spurious on remeasurement. |