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	Menkar, a Cet, alf Cet, 92 Cet, HR 911, HD 18884, SAO 110920, BD +3 419, FK5: 107
other names	Mekab, Menkab, Monkar
constellation	Cetus

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

note (category: star names):

MENKAR; Mekab; Menkab; Monkar.

position, motion, parallax:

position (J2000)	RA: 3h 2min 16.8sec	DEC: +4° 5' 23''
position (B1900)	RA: 2h 57min 3sec	DEC: +3° 41' 51''
proper motion (J2000)	RA: -0.009 arcsec/a	DEC: -0.078 arcsec/a
radial velocity	-26 km/s note: variable radial velocity
trigonometric parallax	0.009 arcsec
galactic coordinates	longitude: 173.32°	latitude: -45.59°

magnitude

visual magnitude

2.53 (V on UBV Johnson system)

spectral / color information

spectral class	M1.5IIIa
B-V-magnitude	1.64
U-B-magnitude	1.94
R-I-magnitude
IR-note	object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

note (category: spectra):

Ultraviolet FeII emission.

variability information

variable star identification

Alp Cet

note (category: variability):

Lb? 2.45 - 2.54V. Spectrum var.

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

position, motion, parallax:

position (J2000)	RA: 3h 2min 16.773sec	DEC: +4° 5' 22.93''	±0.06 arcsec	source: 15
proper motion (J2000)	RA: -0.0006 arcsec/a	DEC: -0.078 arcsec/a		source: 25
radial velocity	-26 km/s			source: 25
trigonometric parallax	0.009 arcsec		±0.001 arcsec	source: 25
galactic coord. (B1950)	longitude: 173.32°	latitude: -45.59°

magnitude:

visual	2.4 (observed)	source: 31
photovisual	2.8	source: 2

spectral information:

spectral class	M0		source: 96
Morgan-Keenan	M1.5IIIa		source: 25
B-magnitude	4.17 ±0.05	B-V-magnitude	1.64
U-magnitude	6.11 ±0.05	U-B-magnitude	1.94

variability information:

source of data: 30

variability type	171
var. amplitude	0.09

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
31	CRM' (non-GCVS variable data)
Warren, W.H. Jr., Northern Hemisphere Catalog of Red Magnitudes, 1994
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 59min 39.744sec	DEC: +3° 53' 41.15''	±0.003 arcsec
position (J2000)	RA: 3h 2min 16.777sec	DEC: +4° 5' 22.93''
proper motion B1950 (FK4)	RA: -0.0008 arcsec/a	DEC: -0.074 arcsec/a	±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0006 arcsec/a	DEC: -0.078 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	2.8 (accuracy: 2 decimals)
source of visual magnitude data	Taken from the "Henry Draper Catalogue".

spectral information:

spectral class	M0
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	FK4, catalogue number: 107
Durchmusterung	BD+03 419
Boss General Catalogue	3643
Henry Draper Catalogue	18884

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

position:

position (equinox 1950.0)

RA: 2h 59min 39.7sec

DEC: +3° 53' 41''

variability informations:

variability type	LB:	pulsating variable star
magnitute at max. brightness	2.45
magnitute at min. brightness	2.54
photometric system	visual, photovisual or Johnson's V

spectral information

spectral class

M2III

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	21/9001
constellation	Cetus
notes on existence	The star is equivalent to '0219004 del'.

variability type description

variability type

description

LB

Slow irregular variables. The light variations of these stars show no evidence of periodicity, or any periodicity present is very poorly defined and appears only occasionally. Like for the type I, stars are often attributed to this type because of being insufficiently studied. Many type L variables are really semiregulars or belong to other types. LB Slow irregular variables of late spectral types (K, M, C, S); as a rule, they are giants (CO Cyg). This type is also ascribed, in the GCVS, to slow red irregular variables in the case of unknown spectral types and luminosities. LC Irregular variable supergiants of late spectral types having amplitudes of about 1 mag in V (TZ Cas).