SX Centauri
| catalogues and names |
| SKY2000 - Master Star Catalog |
| Smithsonian Astrophysical Observatory Star Catalog |
| Combined General Catalogue of Variable Stars (Vol. I-III) |
catalogues and names
| catalogues and names | SX Cen, HD 107439, SAO 223370, CP -48 4730 |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 12h 21min 12.591sec | DEC: -49° 12' 41.17'' | ±0.18 arcsec | source: 16 |
| position (2000.72) | RA: 12h 21min 15sec | DEC: -49° 12' 55'' | JD: 2451809.28 | |
| proper motion (J2000) | RA: -0.0013 arcsec/a | DEC: 0.002 arcsec/a | source: 16 | |
| galactic coord. (B1950) | longitude: 297.87° | latitude: 13.36° | ||
magnitude:
| visual | 9.7 (derived) | |
| photovisual | 9.7 | source: 16 |
spectral information:
| spectral class | F5 | source: 29 | |
| Morgan-Keenan | G3/5Vp | source: 10 | |
variability information:
| variability type | 132 |
| var. amplitude | 2.9 |
| var. period | 32.86 |
sources:
| 10 | Michigan Catalog of 2-Dimensional Spectral Types for the HD Stars, Volumes I-III |
| Houk, N., and A.P. Cowley, Michigan Catalogue of 2-Dimensional Spectral Types for the HD Stars, Vol. 1., (Zones -89 to -53 Degrees), Ann Arbor: The University of Michigan, 1975, and Houk, N., Michigan Catalogue of 2-Dimensional Spectral Types for the HD Stars, Vol. 2., (Zones -52 to -40 Degrees), Ann Arbor: The University of Michigan, 1978, and Houk, N., Michigan Catalogue of 2-Dimensional Spectral Types for the HD Stars, Vol. 3., (Zones -40 to -26 Degrees), Ann Arbor: The University of Michigan, 1982 | |
| 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 | |
| 29 | SAOJ2000 |
| SAO on FK5 at J2000, 1989 | |
| 30 | GCVS, 4th edition |
| Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88 | |
data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)
position and proper motion:
| position (B1950) | RA: 12h 18min 32.228sec | DEC: -48° 56' 1.93'' | ±0.064 arcsec |
| position (2000.72) | RA: 12h 21min 15sec | DEC: -49° 12' 55'' | JD: 2451809.28 |
| position (J2000) | RA: 12h 21min 12.563sec | DEC: -49° 12' 39.88'' | |
| proper motion B1950 (FK4) | RA: -0.002 arcsec/a | DEC: 0.012 arcsec/a | ±0.012 arcsec/a in RA ±0.012 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0.0019 arcsec/a | DEC: 0.015 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
spectral information:
| spectral class | F5 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
remarks for duplicity and variability
| Variable star in both magnitudes |
catalogues
| source catalogue | Cape Zone, catalogue number: 10288 |
| Durchmusterung | CP-48 4730 |
| Henry Draper Catalogue | 107439 |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 12h 18min 32.2sec | DEC: -48° 56' 2'' |
variability informations:
| variability type | RVB | pulsating variable star |
| magnitute at max. brightness | 9.6 | |
| magnitute at min. brightness | 12.5 | |
| photometric system | photographic magnitudes | |
| period [d] | 32.8642 |
spectral information
| spectral class | F5-G3/5Vp |
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 | 19/24 |
| constellation | Centaurus |
| notes on existence | The star is equivalent to '0190025 SY'. |
| There are notes in published catalog. | |
variability type description
| variability type | description |
| RVB | Variables of the RV Tauri type. These are radially pulsating supergiants having spectral types F-G at maximum light and K-M at minimum. The light curves are characterized by the presence of double waves with alternating primary and secondary minima that can vary in depth so that primary minima may become secondary and vice versa. The complete light amplitude may reach 3-4 mag in V. Periods between two adjacent primary minima (usually called formal periods) lie in the range 30-150 days (these are the periods appearing in the Catalogue). Two subtypes, RVA and RVB, are recognized: RVA RV Tauri variables that do not vary in mean magnitude (AC Her); RVB RV Tauri variables that periodically (with periods from 600 to 1500 days and amplitudes up to 2 mag in V) vary in mean magnitude (DF Cyg, RV Tau). |