RT Aurigae
catalogues and names
catalogues and names | RT Aur, 48 Aur, HR 2332, HD 45412, SAO 59128, BD +30 1238 |
constellation | Auriga |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
position (J2000) | RA: 6h 28min 34.1sec | DEC: +30° 29' 35'' | ||
position (2000.72) | RA: 6h 28min 37sec | DEC: +30° 29' 33'' | ||
position (B1900) | RA: 6h 22min 8.4sec | DEC: +30° 33' 18'' | ||
proper motion (J2000) | RA: 0.002 arcsec/a | DEC: -0.013 arcsec/a | ||
radial velocity | 22 km/s note: variable radial velocity |
|||
rotational velocity | 0 km/s (uncertain) (variable) | |||
trigonometric parallax | 0.005 arcsec | |||
galactic coordinates | longitude: 183.15° | latitude: 8.92° |
magnitude
visual magnitude | 5.55 (V on UBV Johnson system) |
spectral / color information
spectral class | F8Ib |
B-V-magnitude | 0.68 |
U-B-magnitude | 0.5 |
note (category: spectra): | Also classified F4Ib-G1Ib. |
variability information
variable star identification | RT Aur |
note (category: variability): | CDelta 5.02 - 5.82V. Per. changing, 3.728365 before 1950, 3.728115 since. CaII emission on rising branch of light curve. Blue companion suspected. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
position (J2000) | RA: 6h 28min 34.082sec | DEC: +30° 29' 35.28'' | ±0.43 arcsec | source: 16 |
position (2000.72) | RA: 6h 28min 37sec | DEC: +30° 29' 33'' | JD: 2451806.24 | |
proper motion (J2000) | RA: -0.0003 arcsec/a | DEC: -0.006 arcsec/a | source: 25 | |
radial velocity | 22 km/s | source: 25 | ||
trigonometric parallax | 0.005 arcsec | - | source: 25 | |
galactic coord. (B1950) | longitude: 183.15° | latitude: 8.92° |
magnitude:
visual | 5 (observed) | source: 31 |
photographic | 6.4 | source: 16 |
spectral information:
spectral class | G0 | source: 96 | |
Morgan-Keenan | F8Ib | source: 25 | |
B-magnitude | 6.23 ±0.05 | B-V-magnitude | 0.68 |
U-magnitude | 6.73 ±0.05 | U-B-magnitude | 0.5 |
variability information:
variability type | 111 |
var. amplitude | 0.82 |
var. period | 3.73 |
var. epoch | 2442361 9. November 1974, 12:00:00 UT |
next max light | 2451809.09 21. September 2000, 14:09:36 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 | |
31 | CRM' (non-GCVS variable data) |
Warren, W.H. Jr., Northern Hemisphere Catalog of Red Magnitudes, 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 (B1950) | RA: 6h 25min 21.251sec | DEC: +30° 31' 33.15'' | ±0.019 arcsec |
position (2000.72) | RA: 6h 28min 37sec | DEC: +30° 29' 34'' | JD: 2451806.24 |
position (J2000) | RA: 6h 28min 34.094sec | DEC: +30° 29' 34.89'' | |
proper motion B1950 (FK4) | RA: 0.0002 arcsec/a | DEC: -0.014 arcsec/a | ±0.004 arcsec/a in RA ±0.003 arcsec/a in DEC |
proper motion J2000 (FK5) | RA: 0.0001 arcsec/a | DEC: -0.013 arcsec/a | |
source of proper motion data | Determined by source catalog |
magnitude:
visual | 5 (accuracy: 1 decimal) |
source of visual magnitude data | Source cited in source catalog introduction. |
spectral information:
spectral class | G0 |
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: 8371 |
Durchmusterung | BD+30 1238 |
Boss General Catalogue | 8371 |
Henry Draper Catalogue | 45412 |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
position (equinox 1950.0) | RA: 6h 25min 21.3sec | DEC: +30° 31' 33'' |
variability informations:
variability type | DCEP | pulsating variable star |
magnitute at max. brightness | 5 | |
magnitute at min. brightness | 5.82 | |
photometric system | visual, photovisual or Johnson's V | |
epoch for maximum light [JD] | 2442361.155 9. November 1974, 15:43:12 UT |
|
period [d] | 3.728115 | |
next maximum light [JD] | 2451808.19841 20. September 2000, 16:45:43 UT |
|
rising time | 25 % of period |
spectral information
spectral class | F4Ib-G1Ib |
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 | 8/12 |
constellation | Auriga |
notes on existence | The star is equivalent to '0080013 RU'. |
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. |