U Trianguli Australis
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 | U TrA, HD 143999, SAO 253430, CP -62 5187 |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
position (J2000) | RA: 16h 7min 19.052sec | DEC: -62° 54' 37.58'' | ±0.18 arcsec | source: 16 |
position (2000.72) | RA: 16h 7min 23sec | DEC: -62° 54' 45'' | JD: 2451806.31 | |
proper motion (J2000) | RA: 0.0007 arcsec/a | DEC: 0.008 arcsec/a | source: 16 | |
galactic coord. (B1950) | longitude: 323.24° | latitude: -8.04° |
magnitude:
visual | 7.3 (observed) | source: 30 |
photovisual | 8 | source: 16 |
spectral information:
spectral class | F5 | source: 96 | |
Morgan-Keenan | F8Ib/II | source: 10 | |
B-magnitude | 8.13 ±0.02 | B-V-magnitude | 0.49 |
variability information:
variability type | 114 |
var. amplitude | 0.99 |
var. period | 2.57 |
var. epoch | 2443267 3. May 1977, 12:00:00 UT |
next max light | 2451807.11 19. September 2000, 14:38:24 UT |
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 | |
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: 16h 2min 51.183sec | DEC: -62° 46' 36.64'' | ±0.09 arcsec |
position (2000.72) | RA: 16h 7min 23sec | DEC: -62° 54' 45'' | JD: 2451806.31 |
position (J2000) | RA: 16h 7min 19.355sec | DEC: -62° 54' 39.38'' | |
proper motion B1950 (FK4) | RA: 0.0045 arcsec/a | DEC: -0.019 arcsec/a | ±0.022 arcsec/a in RA ±0.02 arcsec/a in DEC |
proper motion J2000 (FK5) | RA: 0.0034 arcsec/a | DEC: -0.016 arcsec/a | |
source of proper motion data | Determined by source catalog |
magnitude:
photographic | 8 (accuracy: 1 decimal) |
source of photographic magnitude data | Source cited in source catalog introduction. |
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 photographic magnitude in source catalog |
catalogues
source catalogue | GC, catalogue number: 21614 |
Durchmusterung | CP-62 5187 |
Boss General Catalogue | 21614 |
Henry Draper Catalogue | 143999 |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
position (equinox 1950.0) | RA: 16h 2min 51.2sec | DEC: -62° 46' 37'' |
variability informations:
variability type | CEP(B) | pulsating variable star |
magnitute at max. brightness | 7.3 | |
magnitute at min. brightness | 8.29 | |
photometric system | visual, photovisual or Johnson's V | |
epoch for maximum light [JD] | 2443267.14 3. May 1977, 15:21:36 UT |
|
period [d] | 2.568423 | |
next maximum light [JD] | 2451807.146475 19. September 2000, 15:30:55 UT |
|
rising time | 34 % of period |
spectral information
spectral class | F5-F8Ib/II |
references
to a study | Vol. III GCVS |
to a chart/photograph | Vol. I GCVS (see Kholopov et al. 1985-1988) |
miscanellous
ID in the GCVS catalogue | 81/4 |
constellation | Triangulum Australe |
notes on existence | The star is equivalent to '0810005 V'. |
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. |