TU Cassiopeiae
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 | TU Cas, HD 2207, SAO 21398, BD +50 72 |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
position (J2000) | RA: 0h 26min 19.427sec | DEC: +51° 16' 49.21'' | ±0.2 arcsec | source: 52 |
position (2000.72) | RA: 0h 26min 21sec | DEC: +51° 17' 3'' | JD: 2451806.31 | |
proper motion (J2000) | RA: -0.0004 arcsec/a | DEC: -0.006 arcsec/a | source: 52 | |
radial velocity | -22 km/s | source: 26 | ||
galactic coord. (B1950) | longitude: 118.94° | latitude: -11.4° |
magnitude:
visual | 6.9 (observed) | source: 31 |
photographic | 8.6 | source: 16 |
spectral information:
spectral class | F2 | source: 96 | |
Morgan-Keenan | F3II-F5II | source: 26 | |
B-magnitude | 7.53 ±0.012 | B-V-magnitude | 0.35 |
U-magnitude | 7.85 ±0.058 | U-B-magnitude | 0.32 |
variability information:
variability type | 114 |
var. amplitude | 1.3 |
var. period | 2.14 |
var. epoch | 2441705 22. January 1973, 12:00:00 UT |
next max light | 2451807.94 20. September 2000, 10:33:36 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 | |
26 | Bright Star Supplement |
Hoffleit, D. and Warren, W.H. Jr., A Supplement to the Bright Star Catalogue, 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 | |
52 | PPMN-HP subset |
PPMN Star Catalogue (Reference 16) High-Precision Subset (Code H) | |
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: 0h 23min 36.678sec | DEC: +51° 0' 13.47'' | ±0.014 arcsec |
position (2000.72) | RA: 0h 26min 22sec | DEC: +51° 17' 3'' | JD: 2451806.31 |
position (J2000) | RA: 0h 26min 19.438sec | DEC: +51° 16' 49.33'' | |
proper motion B1950 (FK4) | RA: -0.0005 arcsec/a | DEC: 0.001 arcsec/a | ±0.007 arcsec/a in RA ±0.007 arcsec/a in DEC |
proper motion J2000 (FK5) | RA: -0.0004 arcsec/a | DEC: -0.004 arcsec/a | |
source of proper motion data | Determined by source catalog |
magnitude:
visual | 8.3 (accuracy: 1 decimal) |
source of visual magnitude data | Taken from AGK1. |
spectral information:
spectral class | F2 |
source of spectral data | Taken from the HD with M stars reclassified by Miss Cannon. |
remarks for duplicity and variability
Variable star in photographic magnitude in source catalog |
catalogues
source catalogue | Yale Transactions 26 Part II, catalogue number: 172 |
Durchmusterung | BD+50 72 |
Henry Draper Catalogue | 2207 |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
position (equinox 1950.0) | RA: 0h 23min 36.7sec | DEC: +51° 0' 13'' |
variability informations:
variability type | CEP(B) | pulsating variable star |
magnitute at max. brightness | 6.88 | |
magnitute at min. brightness | 8.18 | |
photometric system | visual, photovisual or Johnson's V | |
epoch for maximum light [JD] | 2441704.839 22. January 1973, 08:08:10 UT |
|
period [d] | 2.139298 | |
next maximum light [JD] | 2451806.604156 19. September 2000, 02:29:59 UT |
|
rising time | 31 % of period |
spectral information
spectral class | F3II-F5II |
references
to a study | Vol. I GCVS (see Kholopov et al. 1985-1988) |
to a chart/photograph | no chart is avaible, but the star is contained in the 'Bonner Durchmusterung' |
miscanellous
ID in the GCVS catalogue | 18/28 |
constellation | Cassiopeia |
notes on existence | The star is equivalent to '0180029 TV'. |
There are notes in published catalog. |
variability type description
variability type | description |
CEP(B) | Cepheids. Radially pulsating, high luminosity (classes Ib-II) variables with periods in the range of 1-135 days and amplitudes from several hundredths to 2 mag in V (in the B band, the amplitudes are greater). Spectral type at maximum light is F; at minimum, the types are G-K. The longer the period of light variation,the later is the spectral type. The maximum of the surface-layer expansion velocity almost coinciding with maximum light. CEP(B) Cepheids (TU Cas, V 367 Sct) displaying the presence of two or more simultaneously operating pulsation modes (usually the fundamental tone with the period P0 and the first overtone P1). The periods P0 are in the range from 2 to 7 days, with the ratio P1/P0 approx. 0.71. |