S Car
| catalogues and names | S Car, HR 3999, HD 88366, SAO 250840 |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 10h 9min 21,9sec | DEC: -61° 32' 57'' |
| position (J1900) | RA: 10h 6min 10,6sec | DEC: -61° 3' 35'' |
| proper motion (J2000) | RA: -0,094 arcsec/a | DEC: 0,073 arcsec/a |
| radial velocity | 289 km/s note: suspected variable radial velocity |
|
magnitude
| visual magnitude | 5,6 (V on UBV Johnson system) |
spectral / color information
| spectral class | M2-3IIIe |
| B-V-magnitude | 1,6 |
| U-B-magnitude | 1,75 |
| R-I-magnitude | 1,54 |
| note (category: spectra): | Also classified K5e-M6e. |
variability information
| variable star identification | S Car |
| note (category: variability): | M 4.5 - 9.9v, 149.49d. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 10h 9min 21,879sec | DEC: -61° 32' 56,69'' | ±0,19 arcsec | source: 16 |
| proper motion (J2000) | RA: -0,0128 arcsec/a | DEC: 0,071 arcsec/a | source: 25 | |
| radial velocity | 289 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 284,85° | latitude: -4,51° | ||
| GCI unit vector (J2000) | X: -0,421966 | Y: 0,22115 | Z: -0,879226 | |
magnitude:
| visual | 5,6 (observed) | source: 25 |
| photovisual | 7,2 | source: 16 |
spectral information:
| spectral class | M0 | source: 96 | |
| Morgan-Keenan | M2-3IIIe | source: 25 | |
| B-magnitude | 7,2 ±0,05 | B-V-magnitude | 1,6 |
| U-magnitude | 8,95 ±0,05 | U-B-magnitude | 1,75 |
variability information:
| variability type | 180 |
| var. amplitude | 5,4 |
| var. period | 149,49 |
| var. epoch | 2442112 5. March 1974, 12:00:00 UT |
| next max light | 2451679,36 14. May 2000, 20:38:24 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 (J1950) | RA: 10h 7min 46,152sec | DEC: -61° 18' 14,15'' | ±0,034 arcsec |
| position (J2000) | RA: 10h 9min 21,874sec | DEC: -61° 32' 56,82'' | |
| proper motion J1950 (FK4) | RA: -0,0129 arcsec/a | DEC: 0,07 arcsec/a | ±0,008 arcsec/a in RA ±0,007 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0,0132 arcsec/a | DEC: 0,073 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 5,4 (accuracy: 1 decimal) |
| source of visual magnitude data | Source cited in source catalog introduction. |
spectral information:
| spectral class | M2e |
| 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: 13971 |
| Durchmusterung | CP-60 1701 |
| Boss General Catalogue | 13971 |
| Henry Draper Catalogue | 88366 |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (J1950) | RA: 10h 7min 46,2sec | DEC: -61° 18' 14'' |
variability informations:
| variability type | M | pulsating variable star |
| magnitute at max. brightness | 4,5 | |
| magnitute at min. brightness | 9,9 | |
| photometric system | visual, photovisual or Johnson's V | |
| epoch for maximum light [JD] | 2442112 5. March 1974, 12:00:00 UT |
|
| period [d] | 149,49 | |
| next maximum light [JD] | 2451679,36 14. May 2000, 20:38:24 UT |
|
| rising time | 51 % of period |
spectral information
| spectral class | K5e-M6e |
references
| to a study | the main characteristics of the star was determined by the authors themselves |
| to a chart/photograph | Vol. I GCVS (see Kholopov et al. 1985-1988) |
miscanellous
| ID in the GCVS catalogue | 17/2 |
| constellation | Carina |
| notes on existence | The star is equivalent to '0170003 T'. |
variability type description
| variability type | description |
| M | Mira (Omicron) Ceti-type variables. These are long-period variable giants with characteristic late-type emission spectra (Me, Ce, Se) and light amplitudes from 2.5 to 11 mag in V. Their periodicity is well pronounced, and the periods lie in the range between 80 and 1000 days. Infrared amplitudes are usually less than in the visible and may be <2.5 mag. For example, in the K band they usually do not exceed 0.9 mag. If the amplitudes exceed 1 - 1.5 mag , but it is not certain that the true light amplitude exceeds 2.5 mag, the symbol "M" is followed by a colon, or the star is attributed to the semiregular class with a colon following the symbol for that type (SR). |