b Gruis
| catalogues and names | b Gru, bet Gru, HR 8636, HD 214952, SAO 231258, FK5: 856 |
| constellation | Grus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 22h 42min 40,1sec | DEC: -46° 53' 5'' |
| position (J1900) | RA: 22h 36min 41,8sec | DEC: -47° 24' 27'' |
| proper motion (J2000) | RA: 0,137 arcsec/a | DEC: -0,008 arcsec/a |
| radial velocity | 2 km/s | |
| trigonometric parallax | 0,008 arcsec | |
magnitude
| visual magnitude | 2,1 (V on UBV Johnson system) |
spectral / color information
| spectral class | M5III |
| B-V-magnitude | 1,6 |
| U-B-magnitude | 1,67 |
| R-I-magnitude | 1,65 |
| note (category: spectra): | Also classified M3II. |
variability information
| variable star identification | Bet Gru |
| note (category: variability): | Lc? 2.0 - 2.3V. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 22h 42min 40,063sec | DEC: -46° 53' 4,69'' | ±0,19 arcsec | source: 16 |
| proper motion (J2000) | RA: 0,0133 arcsec/a | DEC: -0,008 arcsec/a | source: 25 | |
| radial velocity | 2 km/s | source: 25 | ||
| trigonometric parallax | 0,008 | ±0,001 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 346,27° | latitude: -57,95° | ||
| GCI unit vector (J2000) | X: 0,644929 | Y: -0,226269 | Z: -0,729979 | |
magnitude:
| visual | 2,1 (observed) | source: 25 |
| photovisual | 2,2 | source: 2 |
| photographic | 3,6 | source: 2 |
spectral information:
| spectral class | M0 | source: 96 | |
| Morgan-Keenan | M4.5III | source: 25 | |
| B-magnitude | 3,7 ±0,05 | B-V-magnitude | 1,6 |
| U-magnitude | 5,37 ±0,05 | U-B-magnitude | 1,67 |
variability information:
| variability type | 172 |
| var. amplitude | 0,3 |
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 | |
| 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 | |
| 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: 22h 39min 41,443sec | DEC: -47° 8' 48,2'' | ±0,01 arcsec |
| position (J2000) | RA: 22h 42min 40,067sec | DEC: -46° 53' 4,92'' | |
| proper motion J1950 (FK4) | RA: 0,0135 arcsec/a | DEC: -0,006 arcsec/a | ±0,002 arcsec/a in RA ±0,002 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,0135 arcsec/a | DEC: -0,011 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 2,2 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
| spectral class | M3 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | FK4, catalogue number: 856 |
| Durchmusterung | CD-4714308 |
| Boss General Catalogue | 31685 |
| Henry Draper Catalogue | 214952 |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (J1950) | RA: 22h 39min 41,4sec | DEC: -47° 8' 48'' |
variability informations:
| variability type | LC: | pulsating variable star |
| magnitute at max. brightness | 2 | |
| magnitute at min. brightness | 2,3 | |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | M3-5II-III |
references
| to a study | Vol. I GCVS (see Kholopov et al. 1985-1988) |
| to a chart/photograph | Vol. I GCVS (see Kholopov et al. 1985-1988) |
miscanellous
| ID in the GCVS catalogue | 39/9002 |
| constellation | Grus |
| notes on existence | The star is equivalent to '03990042del 2'. |
variability type description
| variability type | description |
| LC | Slow irregular variables. The light variations of these stars show no evidence of periodicity, or any periodicity present is very poorly defined and appears only occasionally. Like for the type I, stars are often attributed to this type because of being insufficiently studied. Many type L variables are really semiregulars or belong to other types. LB Slow irregular variables of late spectral types (K, M, C, S); as a rule, they are giants (CO Cyg). This type is also ascribed, in the GCVS, to slow red irregular variables in the case of unknown spectral types and luminosities. LC Irregular variable supergiants of late spectral types having amplitudes of about 1 mag in V (TZ Cas). |