catalogues and names

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

SKY2000 - Master Star Catalog

Smithsonian Astrophysical Observatory Star Catalog

The Washington Visual Double Star Catalog, 1996.0

catalogues and names

catalogues and names	n Gem, 18 Gem, HR 2343, HD 45542, SAO 78423, BD +20 1441, FK5: 1173, WDS 06290+2013Aa
constellation	Gemini

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

position, motion, parallax:

position (J2000)	RA: 6h 28min 57.8sec	DEC: +20° 12' 44''
position (B1900)	RA: 6h 23min 1.5sec	DEC: +20° 16' 32''
proper motion (J2000)	RA: -0.007 arcsec/a	DEC: -0.014 arcsec/a
radial velocity	39 km/s note: spectroscopic binaries
rotational velocity	219 km/s (uncertain) (variable)
trigonometric parallax	0.009 arcsec
galactic coordinates	longitude: 192.42°	latitude: 4.35°

magnitude

visual magnitude

4.15 (V on UBV Johnson system)

spectral / color information

spectral class	B6IIIe
B-V-magnitude	-0.13
U-B-magnitude	-0.48
R-I-magnitude

note (category: spectra):

Shell star.

double/multiple star system information

number of components of multiple star system	8
separation	0.2 arcsec
mag difference (of double or brightest multiple)	1.7
component ID	AA'

note (category: double and multiple data):

AA' probably combined light and color. This may be the SB pair, 4.3, 6.0v, sep. 0.2". B, 8.5V A1V at 113", vsini 141k/s, is binary with C, 8.9v, sep. 0.2". Component P, 15.1V at 24" optical. Other components faint at 54" to 92".

note (category: spectroscopic binaries):

ADS 5103A, 9.6y. Resolved by speckle interferometry 1983.93, sep. 0.07".

miscellaneous information

note (category: group membership):

Hyades group.

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

position, motion, parallax:

position (J2000)	RA: 6h 28min 57.781sec	DEC: +20° 12' 43.56''	±0.06 arcsec	source: 15
proper motion (J2000)	RA: -0.0005 arcsec/a	DEC: -0.014 arcsec/a		source: 25
radial velocity	39 km/s			source: 25
trigonometric parallax	0.009 arcsec		±0.001 arcsec	source: 25
galactic coord. (B1950)	longitude: 192.43°	latitude: 4.35°

magnitude:

visual	4.15 (observed)	source: 25
photovisual	4.1	source: 2

spectral information:

spectral class	B5		source: 96
Morgan-Keenan	B6IIIe		source: 25
B-magnitude	4.02 ±0.05	B-V-magnitude	-0.13
U-magnitude	3.54 ±0.05	U-B-magnitude	-0.48

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	112.5 arcsec
magnitude difference between brightest and second brightest component	3.85
position angle	329 °

component	magnitude	spectral class	catalogue(s)/name(s)
A	4.15	B5	n Geminorum, 18 Gem, HR 2343, HD 45542, SAO 78423
B	8	A0

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
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 25min 59.627sec	DEC: +20° 14' 44.06''	±0.004 arcsec
position (J2000)	RA: 6h 28min 57.784sec	DEC: +20° 12' 43.45''
proper motion B1950 (FK4)	RA: -0.0004 arcsec/a	DEC: -0.017 arcsec/a	±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0005 arcsec/a	DEC: -0.015 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 the "Henry Draper Catalogue".

spectral information:

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

catalogues

source catalogue	FK4, catalogue number: 1173
Durchmusterung	BD+20 1441
Boss General Catalogue	8394
Henry Draper Catalogue	45542

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

position and proper motion:

position (J2000)	RA: 6h 29min	DEC: +20° 13'
proper motion (J2000)	RA: -0.007 arcsec/a	DEC: -0.014 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
Aa	1920	8	121°	0.2''	4.1	-	B5	BTZ 1
	1991		310°	0.1''
Aa-BC	1876	7	329°	112.5''	4.15	8	B6IIIe	STT 77
Aa-P	1890	2	358°	22.6''	4.1	15.1	-	BU 1192
	1958		360°	23.7''
Aa-Q	1890	1	13°	53.9''	4.15	13.9	B6III	BU 1192
Aa-R	1890	2	255°	56.8''	4.15	12.6	B6III	BU 1192
	1924		254°	55.6''
Aa-S	1890	1	12°	92.1''	-	13	-	BU 1192
BC	1890	35	346°	0.2''	8.6	8.9	-	BU 1192
	1991		354°	0.1''

discoverer information:

discoverer code	discoverer	reference
BTZ 1	Bernewitz, E.	(Publ. Berlin Babelsberg Obs. 14, Pt.1; 1962.)
STT 77	Struve, O.	-
BU 1192	Burnham, S.W.	-

notes:

note	Nu Gem. BC: Round 1955 (Van Biesbroeck and Finsen) but uncertain whether measures pertain to BC or Aa. Aa: Probably a spectroscopic binary, now resolved. P = 11.7yr., a = 0.05", motion direct.