catalogues and names

The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

SKY2000 - Master Star Catalog

Smithsonian Astrophysical Observatory Star Catalog

Combined General Catalogue of Variable Stars (Vol. I-III)

catalogues and names

catalogues and names	d Cet, del Cet, 82 Cet, HR 779, HD 16582, SAO 110665, BD +0 406, FK5: 91
constellation	Cetus

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)

position, motion, parallax:

position (J2000)	RA: 2h 39min 29sec	DEC: +0° 19' 43''
position (2000.72)	RA: 2h 39min 31sec	DEC: +0° 19' 54''
position (B1900)	RA: 2h 34min 21.3sec	DEC: -0° 6' 10''
proper motion (J2000)	RA: 0.014 arcsec/a	DEC: -0.004 arcsec/a
radial velocity	13 km/s note: spectroscopic binaries
rotational velocity	13 km/s (uncertain) (variable)
trigonometric parallax	0.001 arcsec
galactic coordinates	longitude: 170.76°	latitude: -52.21°

magnitude

visual magnitude

4.07 (V on UBV Johnson system)

spectral / color information

spectral class	B2IV
B-V-magnitude	-0.22
U-B-magnitude	-0.87
R-I-magnitude

variability information

variable star identification

Del Cet

note (category: variability):

Beta C 4.05 - 4.10V, 0.16113668d. Per. changed 1965, then increased about 0.7 sec./century.

double/multiple star system information

note (category: spectroscopic binaries):

0.15d, possibly two periods of oscillation.

miscellaneous information

note (category: group membership):

Cas-Tau OB1.

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

position, motion, parallax:

position (J2000)	RA: 2h 39min 28.953sec	DEC: +0° 19' 42.58''	±0.06 arcsec	source: 15
position (2000.72)	RA: 2h 39min 31sec	DEC: +0° 19' 54''	JD: 2451809.23
proper motion (J2000)	RA: 0.0009 arcsec/a	DEC: -0.004 arcsec/a		source: 25
radial velocity	13 km/s			source: 25
trigonometric parallax	0.001 arcsec		-	source: 25
galactic coord. (B1950)	longitude: 170.77°	latitude: -52.21°

magnitude:

visual	4.07 (observed)	source: 25
photovisual	4	source: 2

spectral information:

spectral class	B2		source: 96
Morgan-Keenan	B2IV		source: 25
B-magnitude	3.85 ±0.05	B-V-magnitude	-0.22
U-magnitude	2.98 ±0.05	U-B-magnitude	-0.87

variability information:

source of data: 30

variability type	140
var. amplitude	0.05
var. period	0.16
var. epoch	2438338 4. November 1963, 12:00:00 UT
next max light	2451809.36 21. September 2000, 20:38:24 UT

sources:

2	HD and HDE Catalogs
Cannon, A.J., and E.C. Pickering, Harvard Annals, Vols 91-99, 1918-24, Cambridge, Massachusetts: Harvard University; Cannon, A.J., Harvard Annals, Vol. 100, 1925-36, Cambridge, Massachusetts: Harvard University; and Cannon, A.J., and M. Walton Mayall, Harvard Annals, Vol. 112, 1949, Cambridge, Massachusetts: Harvard University
15	FK5, FK5 Extension and FK5 Supplement
Fricke, W., H. Schwan and T. Lederle, "Fifth Fundamental Catalogue (FK5), Part I. The Basic Fundamental Stars," Veroff. Astronomisches Recheninstitut, No. 32, Heidelberg, Germany, 1988, and Fricke, W., H. Schwan, and T.E. Corbin, "Fifth Fundamental Catalogue (FK5), Part II. The FK5 Extension," Veröff. Astronomisches Recheninstitut, No. 33, Heidelberg, Germany, 1991
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
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: 2h 36min 54.985sec	DEC: +0° 6' 50''	±0.004 arcsec
position (2000.72)	RA: 2h 39min 31sec	DEC: +0° 19' 54''	JD: 2451809.23
position (J2000)	RA: 2h 39min 28.945sec	DEC: +0° 19' 42.66''
proper motion B1950 (FK4)	RA: 0.0006 arcsec/a	DEC: 0.001 arcsec/a	±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0009 arcsec/a	DEC: -0.003 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	4 (accuracy: 2 decimals)
source of visual magnitude data	Taken from the "Henry Draper Catalogue".

spectral information:

spectral class	B2
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	FK4, catalogue number: 91
Durchmusterung	BD-00 406
Boss General Catalogue	3192
Henry Draper Catalogue	16582

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

position:

position (equinox 1950.0)

RA: 2h 36min 55sec

DEC: +0° 6' 50''

variability informations:

variability type	BCEP	pulsating variable star
magnitute at max. brightness	4.05
magnitute at min. brightness	4.1
photometric system	visual, photovisual or Johnson's V
epoch for maximum light [JD]	2438338.4763 4. November 1963, 23:25:52 UT
period [d]	0.16113668
next maximum light [JD]	2451809.34161132 21. September 2000, 20:11:55 UT

spectral information

spectral class

B2IV

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	21/9004
constellation	Cetus
notes on existence	The star is equivalent to '0219015 omi'.
There are notes in published catalog.

variability type description

variability type

description

BCEP

Variables of the Beta Cephei type (Beta Cep, Beta CMa), which are pulsating O8-B6 I-V stars with periods of light and radial-velocity variations in the range of 0.1 - 0.6 days and light amplitudes from 0.01 to 0.3 mag in V. The light curves are similar in shape to average radial-velocity curves but lag in phase by a quarter of the period, so that maximum brightness corresponds to maximum contraction, i.e., to minimum stellar radius. The majority of these stars probably show radial pulsations, but some (V649 Per) display nonradial pulsations; multiperiodicity is characteristic of many of these stars.