gamma Monocerotis

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

note (category: star names):

Called Alpha Mon in BAC and many early catalogues. Now HR 2970 is called Alpha Mon.

position, motion, parallax:

position (J2000)	RA: 6h 14min 51.3sec	DEC: -6° 16' 29''
position (B1900)	RA: 6h 9min 58.6sec	DEC: -6° 14' 39''
proper motion (J2000)	RA: -0.008 arcsec/a	DEC: -0.019 arcsec/a
radial velocity	-5 km/s note: suspected variable radial velocity
trigonometric parallax	0.013 arcsec
galactic coordinates	longitude: 214.4°	latitude: -10.98°

magnitude

visual magnitude

3.98
(V on UBV Johnson system)

spectral / color information

spectral class	K1.5IIIBa0.3
B-V-magnitude	1.32
U-B-magnitude	1.41
R-I-magnitude
IR-note	object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

double/multiple star system information

separation	51.4 arcsec
mag difference (of double or brightest multiple)	9

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

position, motion, parallax:

magnitude:

spectral information:

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	51.4 arcsec
magnitude difference between brightest and second brightest component	9.1
position angle	27 °

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
19	WDS Catalog
Worley, C.E., and G.G. Douglass, Washington Catalog of Visual Double Stars 1996.0, United States Naval Observatory, 1996
25	Bright Star Catalogue, 5th edition
Hoffleit, D. and Warren, W.H. Jr., The Bright Star Catalogue, 5th Revised Edition, Version 2, 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: 6h 12min 24.938sec	DEC: -6° 15' 28.7''	ą0.012 arcsec
position (J2000)	RA: 6h 14min 51.346sec	DEC: -6° 16' 29.14''
proper motion B1950 (FK4)	RA: -0.0006 arcsec/a	DEC: -0.019 arcsec/a	ą0.002 arcsec/a in RA ą0.002 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0002 arcsec/a	DEC: -0.018 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	4.1 (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.

remarks for duplicity and variability

Double star in Aitken's Double Star Catalogue (Aitken 1932)

catalogues

data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)

position and proper motion:

position (J2000)	RA: 6h 14.9min	DEC: -6° 17'
proper motion (J2000)	RA: -0.008 arcsec/a	DEC: -0.019 arcsec/a

double/multiple star system information:

component	year	number of measures	position angle	angular separation	magnitude of 1st component	magnitude of 2nd component	spectral class(es)	discoverer code
-	1905	1	27°	51.4''	3.98	13.1	K2III	HJ 384

discoverer information:

discoverer code	discoverer	reference
HJ 384	Herschel, J.	-

notes:

note	Gamma Mon.

catalogues and names	g Mon, 5 Mon, HR 2227, HD 43232, SAO 133012, BD -6 1469, FK5: 2475, WDS 06149-0617
constellation	Monoceros