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

4th Catalog of Orbits of Visual Binaries

catalogues and names

catalogues and names	m Her, 86 Her, HR 6623, HD 161797, SAO 85397, BD +27 2888, FK5: 667, WDS 17465+2743A
constellation	Hercules

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

position, motion, parallax:

position (J2000)	RA: 17h 46min 27.5sec	DEC: +27° 43' 14''
position (B1900)	RA: 17h 42min 32.6sec	DEC: +27° 46' 45''
proper motion (J2000)	RA: -0.311 arcsec/a	DEC: -0.751 arcsec/a
radial velocity	-16 km/s note: variable radial velocity
rotational velocity	20 km/s (uncertain) (variable)
trigonometric parallax	0.108 arcsec
galactic coordinates	longitude: 52.45°	latitude: 25.63°

note (category: dynamical parallaxes):

0.132".

magnitude

visual magnitude

3.42 (V on UBV Johnson system)

spectral / color information

spectral class	G5IV
B-V-magnitude	0.75
U-B-magnitude	0.39
R-I-magnitude
IR-note	object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

double/multiple star system information

number of components of multiple star system	4
separation	33.8 arcsec
mag difference (of double or brightest multiple)	6.4
component ID	AxBC

note (category: double and multiple data):

BC 10.3 dM4, 10.8, 43.20y, a = 1.360". This close pair forms a wider physical binary with component A.

miscellaneous information

note (category: group membership):

Wolf 630 group.

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

position, motion, parallax:

position (J2000)	RA: 17h 46min 27.517sec	DEC: +27° 43' 14.35''	±0.06 arcsec	source: 15
proper motion (J2000)	RA: -0.0234 arcsec/a	DEC: -0.751 arcsec/a		source: 25
radial velocity	-16 km/s			source: 25
trigonometric parallax	0.108 arcsec		±0.011 arcsec	source: 25
galactic coord. (B1950)	longitude: 52.45°	latitude: 25.63°

magnitude:

visual	3.42 (observed)	source: 25
photovisual	3.5	source: 2

spectral information:

spectral class	G5		source: 96
Morgan-Keenan	G5IV		source: 25
B-magnitude	4.17 ±0.05	B-V-magnitude	0.75
U-magnitude	4.56 ±0.05	U-B-magnitude	0.39

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	33.8 arcsec
magnitude difference between brightest and second brightest component	6.36
position angle	247 °

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: 17h 44min 29.998sec	DEC: +27° 44' 55.4''	±0.003 arcsec
position (J2000)	RA: 17h 46min 27.574sec	DEC: +27° 43' 14.6''
proper motion B1950 (FK4)	RA: -0.0233 arcsec/a	DEC: -0.747 arcsec/a	±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0228 arcsec/a	DEC: -0.748 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	3.5 (accuracy: 2 decimals)
source of visual magnitude data	Taken from the "Henry Draper Catalogue".

spectral information:

spectral class	G5
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	FK4, catalogue number: 667
Durchmusterung	BD+27 2888
Boss General Catalogue	24138
Henry Draper Catalogue	161797

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

position and proper motion:

position (J2000)	RA: 17h 46.5min	DEC: +27° 43'
proper motion (J2000)	RA: -0.311 arcsec/a	DEC: -0.751 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
A-BC	1831	71	241°	29.9''	3.42	9.78	G5IV	STF2220
	1970		247°	33.8''
AD	1921	1	4°	256.1''	3.42	11.2	-	ABT 14
BC	1857	often	°	''	10.2	10.7	dM4	AC 7
BC-D	1921	1	7°	272.6''	-	11.5	-	ABT 14

discoverer information:

discoverer code	discoverer	reference
STF2220	Struve, F.G.W.	-
ABT 14	Abetti, G.	-
AC 7	-	-

notes:

note	AB: Mu Her. A is physical, and is a large-amplitude astrometric binary, P = 65yr. BC: P = 43.2yr., a = 1.36", motion direct.

data from 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)

position:

position (B1900)

RA: 17h 42.5min

DEC: +27° 47'

magnitudes, spectral classes, orbital elements:

author:	P. Couteau
date of observation:	1957
magnitude of component A:	10.3
magnitude of component B:	10.3
spectral class component B:	dM4
spectral class component B:	dM4
period [y]:	43.2
semi-major axis [arcsec]:	1.36
inclination [deg]:	66.2
node [deg]:	60.7
equinox of node:	1900
eccentricity:	0.178
time of periastron passage:	1965.4
dates of ephemeris:	1955-1974
grade:	definitive
reference:	Bull. Astron. Paris 23, 127; 1960.

notes

Star A = Mu Her (mag. 3.42, 36", G5IV)is physical; A-BC = STF 2220.

other name(s)

AC 7, Mu Her BC