CK Orionis

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

position, motion, parallax:

position (J2000)	RA: 5h 30min 19.8sec	DEC: +4° 12' 15''
position (B1900)	RA: 5h 25min 2.8sec	DEC: +4° 7' 38''
proper motion (J2000)	RA: 0.002 arcsec/a	DEC: -0.048 arcsec/a
radial velocity	15 km/s
galactic coordinates	longitude: 199.53°	latitude: -15.91°

magnitude

visual magnitude

6.21
(V on UBV Johnson system)

spectral / color information

spectral class	K2IIIe
B-V-magnitude	1.27
U-B-magnitude	1.38
R-I-magnitude

variability information

variable star identification

CK Ori

note (category: variability):

SR? 5.9 - 7.1v, 120?d.

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

position, motion, parallax:

position (J2000)	RA: 5h 30min 19.954sec	DEC: +4° 12' 17.35''	ą0.35 arcsec	source: 34
proper motion (J2000)	RA: 0.0018 arcsec/a	DEC: -0.022 arcsec/a		source: 25
radial velocity	15 km/s			source: 25
galactic coord. (B1950)	longitude: 199.54°	latitude: -15.91°

magnitude:

visual	6.21 (observed)	source: 25
photovisual	6.4	source: 2
photographic	7.4	source: 16

spectral information:

spectral class	K0		source: 96
Morgan-Keenan	K2IIIe		source: 25
B-magnitude	7.48 ą0.05	B-V-magnitude	1.27
U-magnitude	8.86 ą0.05	U-B-magnitude	1.38

variability information:

source of data: 30

variability type	190
var. amplitude	1.2
var. period	120

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
34	IRS Catalog
Corbin, T.E., 1991, U.S. Naval Observatory, International Reference Stars Catalog
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: 5h 27min 41.223sec	DEC: +4° 10' 2.12''	ą0.059 arcsec
position (J2000)	RA: 5h 30min 19.815sec	DEC: +4° 12' 14.85''
proper motion B1950 (FK4)	RA: -0.0001 arcsec/a	DEC: -0.047 arcsec/a	ą0.012 arcsec/a in RA ą0.011 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0001 arcsec/a	DEC: -0.048 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	6.4 (accuracy: 2 decimals)
source of visual magnitude data	Taken from Harvard or San Luis photometry.

spectral information:

spectral class	K0
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	GC, catalogue number: 6806
Durchmusterung	BD+04 949
Boss General Catalogue	6806
Henry Draper Catalogue	36217

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

position:

position (equinox 1950.0)

RA: 5h 27min 41.2sec

DEC: +4° 10' 2''

variability informations:

variability type	SR:	pulsating variable star
magnitute at max. brightness	5.9
magnitute at min. brightness	7.1
photometric system	visual, photovisual or Johnson's V
period [d]	120 (uncertain)

spectral information

spectral class

K2IIIe:

references

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

miscanellous

ID in the GCVS catalogue	60/111
constellation	Orion
notes on existence	The star is equivalent to '0600112 CL'.

variability type description

variability type

description

Semiregular variables, which are giants or supergiants of intermediate and late spectral types showing noticeable periodicity in their light changes, accompanied or sometimes interrupted by various irregularities. Periods lie in the range from 20 to >2000 days, while the shapes of the light curves are rather different and variable, and the amplitudes may be from several hundredths to several magnitudes (usually 1-2 mag in V).

SRA
Semiregular late-type (M, C, S or Me, Ce, Se) giants displaying persistent periodicity and usually small (<2.5 mag in V) light amplitudes (Z Aqr). Amplitudes and light-curve shapes generally vary and periods are in the range of 35-1200 days. Many of these stars differ from Miras only by showing smaller light amplitudes;

SRB
Semiregular late-type (M, C, S or Me, Ce, Se) giants with poorly defined periodicity (mean cycles in the range of 20 to 2300 days) or with alternating intervals of periodic and slow irregular changes, and even with light constancy intervals (RR CrB, AF Cyg). Every star of this type may usually be assigned a certain mean period (cycle), which is the value given in the Catalogue. In a number of cases, the simultaneous presence of two or more periods of light variation is observed;

SRC
Semiregular late-type (M, C, S or Me, Ce, Se) supergiants (Mu Cep) with amplitudes of about 1 mag and periods of light variation from 30 days to several thousand days;

SRD
Semiregular variable giants and supergiants of F, G, or K spectral types, sometimes with emission lines in their spectra. Amplitudes of light variation are in the range from 0.1 to 4 mag, and the range of periods is from 30 to 1100 days (SX Her, SV UMa).