T Crucis

data from SKY2000 - Master Star Catalog (Myers+ 1997)

position, motion, parallax:

position (J2000)	RA: 12h 21min 21.136sec	DEC: -62° 16' 53.4''	ą0.19 arcsec	source: 16
position (2000.72)	RA: 12h 21min 23sec	DEC: -62° 17' 7''	JD: 2451806.24
proper motion (J2000)	RA: -0.0015 arcsec/a	DEC: 0.011 arcsec/a		source: 16
radial velocity	-6 km/s			source: 26
galactic coord. (B1950)	longitude: 299.45°	latitude: 0.39°

magnitude:

visual	6.32 (observed)	source: 30
photovisual	6.8	source: 16

spectral information:

spectral class	G0		source: 96
Morgan-Keenan	G2Ib		source: 26
B-magnitude	7.14 ą0.2	B-V-magnitude	0.78
U-magnitude	7.61 ą0.02	U-B-magnitude	0.52

variability information:

source of data: 30

variability type	111
var. amplitude	0.51
var. period	6.73
var. epoch	2434541 12. June 1953, 12:00:00 UT
next max light	2451810.18 22. September 2000, 16:19:12 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
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: 12h 18min 36.501sec	DEC: -62° 0' 14.72''	ą0.053 arcsec
position (2000.72)	RA: 12h 21min 24sec	DEC: -62° 17' 8''	JD: 2451806.24
position (J2000)	RA: 12h 21min 21.182sec	DEC: -62° 16' 52.79''
proper motion B1950 (FK4)	RA: -0.0006 arcsec/a	DEC: 0.008 arcsec/a	ą0.012 arcsec/a in RA ą0.01 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0013 arcsec/a	DEC: 0.013 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	6.6 (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: 16848
Durchmusterung	CP-61 3100
Boss General Catalogue	16848
Henry Draper Catalogue	107447

data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)

position:

position (equinox 1950.0)

RA: 12h 18min 36.5sec

DEC: -62° 0' 15''

variability informations:

variability type	DCEP	pulsating variable star
magnitute at max. brightness	6.32
magnitute at min. brightness	6.83
photometric system	visual, photovisual or Johnson's V
epoch for maximum light [JD]	2434541.34 12. June 1953, 20:09:36 UT
period [d]	6.73331
next maximum light [JD]	2451812.28015 24. September 2000, 18:43:25 UT
rising time	34 % of period

spectral information

spectral class

F6-G2Ib

references

to a study	Vol. I GCVS (see Kholopov et al. 1985-1988)
to a chart/photograph	Vol. I GCVS (see Kholopov et al. 1985-1988)

miscanellous

ID in the GCVS catalogue	30/3
constellation	Crux
notes on existence	The star is equivalent to '0300004 U'.
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.