g Coronae Australis
| catalogues and names | g CrA, HR 7226, HD 177474, SAO 210928, WDS 19064-3704A |
| constellation | Corona Australis |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 19h 6min 25,1sec | DEC: -37° 3' 48'' |
| position (J1900) | RA: 18h 59min 39,5sec | DEC: -37° 12' 25'' |
| proper motion (J2000) | RA: 0,096 arcsec/a | DEC: -0,274 arcsec/a |
| radial velocity | -52 km/s note: spectroscopic binaries |
|
| rotational velocity | 0 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,054 arcsec | |
| note (category: dynamical parallaxes): | 0.062". |
magnitude
| visual magnitude | 4,93 (V on UBV Johnson system) |
spectral / color information
| spectral class | F8V |
| B-V-magnitude | 0,52 |
| U-B-magnitude | 0 |
double/multiple star system information
| separation | 1,6 arcsec |
| mag difference (of double or brightest multiple) | 0,1 |
| note | Worley (1978) update of the IDS |
| note (category: double and multiple data): | AB 4.84 F8V, 5.08 F8V, 120.42y, a = 1.907". B is HR 7227. Combined mag. and colors, 4.205V, +0.52(B-V), +0.00(U-B). vsini for blend 0k/s. |
miscellaneous information
| note (category: group membership): | Hyades group. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 19h 6min 25,168sec | DEC: -37° 3' 48,36'' | ±0,19 arcsec | source: 33 |
| proper motion (J2000) | RA: 0,008 arcsec/a | DEC: -0,273 arcsec/a | source: 25 | |
| radial velocity | -52 km/s | source: 25 | ||
| trigonometric parallax | 0,054 | ±0,005 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 0,17° | latitude: -18,73° | ||
| GCI unit vector (J2000) | X: 0,228035 | Y: -0,764692 | Z: -0,602699 | |
magnitude:
| visual | 4,93 (observed) | source: 25 |
| photovisual | 3,7 | source: 16 |
| photographic | 5,5 | source: 2 |
spectral information:
| spectral class | F8 | source: 96 | |
| Morgan-Keenan | F8V | source: 25 | |
| B-magnitude | 5,45 ±0,05 | B-V-magnitude | 0,52 |
| U-magnitude | 5,45 ±0,05 | U-B-magnitude | 0 |
double/multiple star system information:
| separation between brightest and second brightest component | 1,2 arcsec |
| magnitude difference between brightest and second brightest component | 0,1 |
| position angle | 136 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 4,93 | F8 | g Coronae Australis, HR 7226, HD 177474, SAO 210928 |
| B | 4,99 | F8 | g Coronae Australis, HR 7227, HD 177475, SAO 210928 |
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 | |
| 33 | Hipparcos Main Input Catalogue Version 2 |
| Turon, C., et al., The Hipparcos Input Catalogue, Version 2, CDS Bull. No. 43, p.5, 1993 | |
| 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 (J1950) | RA: 19h 3min 2,4sec | DEC: -37° 8' 13,47'' | ±0,039 arcsec |
| position (J2000) | RA: 19h 6min 25,123sec | DEC: -37° 3' 47,78'' | |
| proper motion J1950 (FK4) | RA: 0,0079 arcsec/a | DEC: -0,273 arcsec/a | ±0,007 arcsec/a in RA ±0,005 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,008 arcsec/a | DEC: -0,274 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 4,3 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from Harvard or San Luis photometry. |
spectral information:
| spectral class | F8 |
| 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: 26263 |
| Durchmusterung | CD-3713048 |
| Boss General Catalogue | 26263 |
| Henry Draper Catalogue | 177474 The "SAO Catalog" entry refers to two consecutive HD numbers, the lower of which is given. |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 19h 6,4min | DEC: -37° 4' |
| proper motion (J2000) | RA: 0,093 arcsec/a | DEC: -0,284 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 |
| - | 1834 | often | ° | '' | 4,9 | 5 | F8V F8V | HJ 5084 |
discoverer information:
| discoverer code | discoverer | reference |
| HJ 5084 | Herschel, J. | - |
notes:
| note | Gamma Cra. P = 122yr., a = 1.90", motion retrograde. |