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	i CMa, iot CMa, 20 CMa, HR 2596, HD 51309, SAO 152126, BD -16 1661, FK5: 2536
constellation	Canis Major

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

position, motion, parallax:

position (J2000)	RA: 6h 56min 8.2sec	DEC: -17° 3' 15''
position (2000.72)	RA: 6h 56min 10sec	DEC: -17° 3' 19''
position (B1900)	RA: 6h 51min 40.6sec	DEC: -16° 55' 28''
proper motion (J2000)	RA: -0.003 arcsec/a	DEC: 0.002 arcsec/a
radial velocity	41 km/s
rotational velocity	29 km/s (uncertain) (variable)
trigonometric parallax	0.005 arcsec
galactic coordinates	longitude: 228.7°	latitude: -6.68°

magnitude

visual magnitude

4.37 (V on UBV Johnson system)

spectral / color information

spectral class	B3II
B-V-magnitude	-0.07
U-B-magnitude	-0.7
R-I-magnitude

variability information

variable star identification

Iot CMa

note (category: variability):

Beta C 4.36 - 4.40v, 0.08:d.

miscellaneous information

note (category: group membership):

Sirius group? Member of the local association (Pleiades group); possible member Collinder 121 (#26).

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

position, motion, parallax:

position (J2000)	RA: 6h 56min 8.207sec	DEC: -17° 3' 15.6''	±0.19 arcsec	source: 16
position (2000.72)	RA: 6h 56min 10sec	DEC: -17° 3' 20''	JD: 2451809.23
proper motion (J2000)	RA: -0.0007 arcsec/a	DEC: -0.004 arcsec/a		source: 25
radial velocity	41 km/s			source: 25
trigonometric parallax	0.005 arcsec		-	source: 25
galactic coord. (B1950)	longitude: 228.71°	latitude: -6.68°

magnitude:

visual	4.37 (observed)	source: 25
photovisual	4.4	source: 2
photographic	4.3	source: 2

spectral information:

spectral class	B5		source: 96
Morgan-Keenan	B3II		source: 25
B-magnitude	4.3 ±0.05	B-V-magnitude	-0.07
U-magnitude	3.6 ±0.05	U-B-magnitude	-0.7

variability information:

source of data: 30

variability type	140
var. amplitude	0.04
var. period	0.08

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
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
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: 6h 53min 54.354sec	DEC: -16° 59' 16.84''	±0.013 arcsec
position (2000.72)	RA: 6h 56min 10sec	DEC: -17° 3' 19''	JD: 2451809.23
position (J2000)	RA: 6h 56min 8.214sec	DEC: -17° 3' 14.56''
proper motion B1950 (FK4)	RA: -0.0007 arcsec/a	DEC: 0.008 arcsec/a	±0.002 arcsec/a in RA ±0.002 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0003 arcsec/a	DEC: 0.011 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	4.4 (accuracy: 2 decimals)
source of visual magnitude data	Taken from Harvard or San Luis photometry.

spectral information:

spectral class	B5
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	GC, catalogue number: 9107
Durchmusterung	BD-16 1661
Boss General Catalogue	9107
Henry Draper Catalogue	51309

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

position:

position (equinox 1950.0)

RA: 6h 53min 54.4sec

DEC: -16° 59' 17''

variability informations:

variability type	BCEP	pulsating variable star
magnitute at max. brightness	4.36
magnitute at min. brightness	4.4
photometric system	visual, photovisual or Johnson's V
period [d]	0.08 (uncertain)

spectral information

spectral class

B3II-III

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	14/9009
constellation	Canis Major
notes on existence	The star is equivalent to '0149010 kap'.

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.