k2Coronae Australis
| catalogues and names | k2CrA, HR 6953, HD 170867, SAO 210295, WDS 18334-3844 |
| constellation | Corona Australis |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 18h 33min 23,1sec | DEC: -38° 43' 34'' |
| position (J1900) | RA: 18h 26min 29,3sec | DEC: -38° 47' 53'' |
| proper motion (J2000) | RA: -0,003 arcsec/a | DEC: -0,03 arcsec/a |
| radial velocity | -20 km/s | |
magnitude
| visual magnitude | 5,65 (V on UBV Johnson system) |
spectral / color information
| spectral class | B9V |
| B-V-magnitude | -0,06 |
double/multiple star system information
| separation | 21,4 arcsec |
| mag difference (of double or brightest multiple) | 0,7 |
| note | Worley (1978) update of the IDS |
| note (category: double and multiple data): | CPM with HR 6952. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 18h 33min 23,076sec | DEC: -38° 43' 12,86'' | ±0,19 arcsec | source: 16 |
| proper motion (J2000) | RA: -0,0001 arcsec/a | DEC: -0,035 arcsec/a | source: 25 | |
| radial velocity | -16 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 356° | latitude: -13,33° | ||
| GCI unit vector (J2000) | X: 0,11325 | Y: -0,771946 | Z: -0,625518 | |
magnitude:
| visual | 6,32 (observed) | source: 25 |
| photovisual | 5,7 | source: 16 |
spectral information:
| spectral class | B9 | source: 96 | |
| Morgan-Keenan | A0III | source: 25 | |
| B-magnitude | 6,31 ±0,05 | B-V-magnitude | -0,01 |
double/multiple star system information:
| separation between brightest and second brightest component | 21,4 arcsec |
| magnitude difference between brightest and second brightest component | 0,7 |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 5,65 | B8 | k2Coronae Australis, HR 6953, HD 170867, SAO 210295 |
| B | 6,32 | B9 | k1Coronae Australis, HR 6952, HD 170868, SAO 210296 |
sources:
| 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 | |
| 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 (J1950) | RA: 18h 29min 56,221sec | DEC: -38° 45' 51,01'' | ±0,032 arcsec |
| position (J2000) | RA: 18h 33min 23,108sec | DEC: -38° 43' 34,45'' | |
| proper motion J1950 (FK4) | RA: -0,0003 arcsec/a | DEC: -0,029 arcsec/a | ±0,007 arcsec/a in RA ±0,006 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0,0003 arcsec/a | DEC: -0,03 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 | B8 |
| 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: 25314 |
| Durchmusterung | CD-3812896 |
| Boss General Catalogue | 25314 |
| Henry Draper Catalogue | 170867 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 18h 33,4min | DEC: -38° 44' |
| proper motion (J2000) | RA: 0,001 arcsec/a | DEC: -0,013 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 |
| - | 1836 | 18 | 359° | 21,4'' | 5,65 | 6,32 | B9V A0III | DUN 222 |
discoverer information:
| discoverer code | discoverer | reference |
| DUN 222 | Dunlop, J. | - |
notes:
| note | Kappa (2) Cra. B is CD-38@12896, Kappa (1) Cra. Proper motion of B +001 -024. |