S Muscae
catalogues and names
| catalogues and names | S Mus, HR 4645, HD 106111, SAO 251791, CP -69 1646 |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 12h 12min 46.8sec | DEC: -70° 9' 7'' | ||
| position (2000.72) | RA: 12h 12min 49sec | DEC: -70° 9' 21'' | ||
| position (B1900) | RA: 12h 7min 23.8sec | DEC: -69° 35' 43'' | ||
| proper motion (J2000) | RA: -0.022 arcsec/a | DEC: -0.009 arcsec/a | ||
| radial velocity | 11 km/s note: spectroscopic binaries |
|||
| galactic coordinates | longitude: 299.64° | latitude: -7.53° | ||
magnitude
| visual magnitude | 6.17 (V on UBV Johnson system) |
spectral / color information
| spectral class | F6Ib |
| B-V-magnitude | 0.84 |
| U-B-magnitude | 0.57 |
| note (category: spectra): | Also classified F6Ib-G0. |
variability information
| variable star identification | S Mus |
| note (category: variability): | CDelta 5.89 - 6.49V. Period changes 9.66011 to 9.66007d. |
double/multiple star system information
| note (category: spectroscopic binaries): | Shortest known orbital per., 506d, for SB with Cepheid primary. Blue companion. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 12h 12min 47.028sec | DEC: -70° 9' 6.27'' | ±0.19 arcsec | source: 16 |
| position (2000.72) | RA: 12h 12min 49sec | DEC: -70° 9' 20'' | JD: 2451806.24 | |
| proper motion (J2000) | RA: -0.0014 arcsec/a | DEC: 0.002 arcsec/a | source: 25 | |
| radial velocity | 11 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 299.64° | latitude: -7.53° | ||
magnitude:
| visual | 5.89 (observed) | source: 30 |
| photovisual | 6.4 | source: 16 |
spectral information:
| spectral class | F8 | source: 96 | |
| Morgan-Keenan | F6Ib | source: 25 | |
| B-magnitude | 7.01 ±0.05 | B-V-magnitude | 0.84 |
| U-magnitude | 7.58 ±0.05 | U-B-magnitude | 0.57 |
variability information:
| variability type | 111 |
| var. amplitude | 0.6 |
| var. period | 9.66 |
| var. epoch | 2440299 18. March 1969, 12:00:00 UT |
| next max light | 2451813.72 26. September 2000, 05:16:48 UT |
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 | |
| 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 (B1950) | RA: 12h 10min 4.183sec | DEC: -69° 52' 25.51'' | ±0.061 arcsec |
| position (2000.72) | RA: 12h 12min 49sec | DEC: -70° 9' 21'' | JD: 2451806.24 |
| position (J2000) | RA: 12h 12min 46.834sec | DEC: -70° 9' 7.22'' | |
| proper motion B1950 (FK4) | RA: -0.0028 arcsec/a | DEC: -0.016 arcsec/a | ±0.011 arcsec/a in RA ±0.011 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0.0043 arcsec/a | DEC: -0.009 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 6.2 (accuracy: 1 decimal) |
| source of visual magnitude data | Source cited in source catalog introduction. |
spectral information:
| spectral class | F8p |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
remarks for duplicity and variability
| Variable star in visual magnitude in source catalog |
catalogues
| source catalogue | GC, catalogue number: 16679 |
| Durchmusterung | CP-69 1646 |
| Boss General Catalogue | 16679 |
| Henry Draper Catalogue | 106111 |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 12h 10min 4.2sec | DEC: -69° 52' 26'' |
variability informations:
| variability type | DCEP | pulsating variable star |
| magnitute at max. brightness | 5.89 | |
| magnitute at min. brightness | 6.49 | |
| photometric system | visual, photovisual or Johnson's V | |
| epoch for maximum light [JD] | 2440299.42 18. March 1969, 22:04:48 UT |
|
| period [d] | 9.66007 | |
| next maximum light [JD] | 2451814.22344 26. September 2000, 17:21:45 UT |
|
| rising time | 49 % of period |
spectral information
| spectral class | F6Ib-G0 |
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 | 56/2 |
| constellation | Musca |
| notes on existence | The star is equivalent to '0560003 T'. |
| There are notes in published catalog. | |
variability type description
| variability type | description |
| DCEP | These are the classical cepheids, or Delta Cep-type variables. Comparatively young objects that have left the main sequence and evolved into the instability strip of the Hertzsprung-Russell (H-R) diagram, they obey the well-known Cepheid period-luminosity relation and belong to the young disk population. DCEP stars are present in open clusters. They display a certain relation between the shapes of their light curves and their periods. |