EN 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 | EN TrA, HD 131356, SAO 252962, CP -68 2226 |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
position (J2000) | RA: 14h 57min 0.658sec | DEC: -68° 50' 22.87'' | ±0.18 arcsec | source: 16 |
position (2000.72) | RA: 14h 57min 5sec | DEC: -68° 50' 33'' | JD: 2451806.31 | |
proper motion (J2000) | RA: -0.0012 arcsec/a | DEC: -0.001 arcsec/a | source: 16 | |
galactic coord. (B1950) | longitude: 313.9° | latitude: -8.68° |
magnitude:
visual | 8.74 (derived) | |
photovisual | 8.7 | source: 16 |
spectral information:
spectral class | G5 | source: 96 | |
Morgan-Keenan | F2Ib | source: 10 |
variability information:
variability type | 113 |
var. amplitude | 0.4 |
var. period | 36.54 |
var. epoch | 2441785 12. April 1973, 12:00:00 UT |
next max light | 2451833.5 15. October 2000, 00:00:00 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: 14h 52min 28.13sec | DEC: -68° 38' 17.44'' | ±0.178 arcsec |
position (2000.72) | RA: 14h 57min 4sec | DEC: -68° 50' 32'' | JD: 2451806.31 |
position (J2000) | RA: 14h 57min 0.259sec | DEC: -68° 50' 21.57'' | |
proper motion B1950 (FK4) | RA: -0.0028 arcsec/a | DEC: 0.011 arcsec/a | ±0.025 arcsec/a in RA ±0.036 arcsec/a in DEC |
proper motion J2000 (FK5) | RA: -0.0046 arcsec/a | DEC: 0.017 arcsec/a | |
source of proper motion data | Determined by source catalog |
magnitude:
visual | 8.7 (accuracy: 1 decimal) |
source of visual magnitude data | Determined by source catalog. |
spectral information:
spectral class | B9 |
source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
source catalogue | Melbourne 4, catalogue number: 3274 |
Durchmusterung | CP-68 2226 |
Henry Draper Catalogue | 131356 |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
position (equinox 1950.0) | RA: 14h 52min 28.1sec | DEC: -68° 38' 17'' |
variability informations:
variability type | CEP: | pulsating variable star |
magnitute at max. brightness | 8.7 | |
magnitute at min. brightness | 9.1 | |
photometric system | photographic magnitudes | |
epoch for maximum light [JD] | 2441785 12. April 1973, 12:00:00 UT |
|
period [d] | 36.54 | |
next maximum light [JD] | 2451833.5 15. October 2000, 00:00:00 UT |
|
rising time | 32 % of period |
spectral information
spectral class | F2Ib |
references
to a study | Vol. I GCVS (see Kholopov et al. 1985-1988) |
to a chart/photograph | Vol. II GCVS |
miscanellous
ID in the GCVS catalogue | 81/157 |
constellation | Triangulum Australe |
notes on existence | The star is equivalent to '0810158 EO'. |
There are notes in published catalog. |
variability type description
variability type | description |
CEP | 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. |