eta Muscae

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

position, motion, parallax:

position (J2000)	RA: 13h 15min 14.9sec	DEC: -67° 53' 40''
position (B1900)	RA: 13h 8min 28sec	DEC: -67° 21' 52''
proper motion (J2000)	RA: -0.041 arcsec/a	DEC: -0.008 arcsec/a
radial velocity	-8 km/s note: spectroscopic binaries note: orbital data avaible
rotational velocity	268 km/s (uncertain) (variable)
galactic coordinates	longitude: 305.18°	latitude: -5.13°

magnitude

visual magnitude

4.8
(V on UBV Johnson system)

spectral / color information

spectral class	B8V
B-V-magnitude	-0.08
U-B-magnitude	-0.35
R-I-magnitude

variability information

variable star identification

*h Mus

note (category: variability):

E? 4.76 - 4.81V.

double/multiple star system information

separation	60 arcsec
mag difference (of double or brightest multiple)	3.2
note	Worley (1978) update of the IDS

note (category: double and multiple data):

Component B, 8.2 A0p, Am?, CPM.

note (category: spectroscopic binaries):

Primary of visual double, 20.0052d, K 56.5k/s, V0 -8.1k/s, asini 15.4.

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

position, motion, parallax:

position (J2000)	RA: 13h 15min 14.89sec	DEC: -67° 53' 40.47''	±0.06 arcsec	source: 15
proper motion (J2000)	RA: -0.0073 arcsec/a	DEC: -0.008 arcsec/a		source: 25
radial velocity	-8 km/s			source: 25
galactic coord. (B1950)	longitude: 305.18°	latitude: -5.13°

magnitude:

visual	4.8 (observed)	source: 25
photovisual	5	source: 2
photographic	4.9	source: 2

spectral information:

spectral class	B8		source: 96
Morgan-Keenan	B8V		source: 25
B-magnitude	4.72 ±0.05	B-V-magnitude	-0.08
U-magnitude	4.37 ±0.05	U-B-magnitude	-0.35

variability information:

source of data: 30

variability type	300
var. amplitude	0.05

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	60 arcsec
magnitude difference between brightest and second brightest component	2.52
position angle	332 °

component	magnitude	spectral class	catalogue(s)/name(s)
A	4.8	B8	h Muscae, HR 4993, HD 114911, SAO 252224
B	7.87	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
30	GCVS, 4th edition
Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88
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: 13h 11min 49.986sec	DEC: -67° 37' 48.79''	±0.013 arcsec
position (J2000)	RA: 13h 15min 14.897sec	DEC: -67° 53' 40.62''
proper motion B1950 (FK4)	RA: -0.0058 arcsec/a	DEC: -0.017 arcsec/a	±0.003 arcsec/a in RA ±0.003 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0073 arcsec/a	DEC: -0.01 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	5 (accuracy: 2 decimals)
source of visual magnitude data	Taken from the "Henry Draper Catalogue".

spectral information:

spectral class	B8
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	FK4, catalogue number: 493
Durchmusterung	CP-67 2224
Boss General Catalogue	17927
Henry Draper Catalogue	114911

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

position and proper motion:

position (J2000)	RA: 13h 15.2min	DEC: -67° 54'
proper motion (J2000)	RA: -0.041 arcsec/a	DEC: -0.009 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
-	1826	2	332°	60''	4.78	7.3	B8V	DUN 131

discoverer information:

discoverer code	discoverer	reference
DUN 131	Dunlop, J.	-

notes:

note	Eta Mus. The primary is a spectroscopic binary and a possible eclipsing system.

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

position:

position (equinox 1950.0)

RA: 13h 11min 50sec

DEC: -67° 37' 49''

variability informations:

variability type	E	close binary eclipsing system
magnitute at max. brightness	4.76
magnitute at min. brightness	4.81
photometric system	visual, photovisual or Johnson's V

spectral information

spectral class

B8V

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 'Cape Photographic Durchmusterung'

miscanellous

ID in the GCVS catalogue	56/9007
constellation	Musca
notes on existence	The star is equivalent to '0569008 tet'.
There are notes in published catalog.

variability type description

variability type

description

Eclipsing binary systems. These are binary systems with orbital planes so close to the observer's line of sight (the inclination i of the orbital plane to the plane orthogonal to the line of sight is close to 90 deg) that the components periodically eclipse each other.
Consequently, the observer finds changes of the apparent combined brightness of the system with the period coincident with that of the components' orbital motion.

EA
Algol (Beta Persei)-type eclipsing systems. Binaries with spherical or slightly ellipsoidal components. It is possible to specify, for their light curves, the moments of the beginning and end of the eclipses. Between eclipses the light remains almost constant or varies insignificantly because of reflection effects, slight ellipsoidality of components, or physical variations. Secondary minima may be absent. An extremely wide range of periods is observed, from 0.2 to >= 10000 days. Light amplitudes are also quite different and may reach several magnitudes.

EB
Beta Lyrae-type eclipsing systems. These are eclipsing systems having ellipsoidal components and light curves for which it is impossible to specify the exact times of onset and end of eclipses because of a continuous change of a system's apparent combined brightness between eclipses; secondary minimum is observed in all cases, its depth usually being considerably smaller than that of the primary minimum; periods are mainly longer than 1 day. The components
generally belong to early spectral types (B-A). Light amplitudes are usually <2 mag in V.

EW
W Ursae Majoris-type eclipsing variables. These are eclipsers with periods shorter than 1 days, consisting of ellipsoidal components almost in contact and having light curves for which it is impossible to specify the exact times of onset and end of eclipses. The depths of the primary and secondary minima are almost equal or differ insignificantly. Light amplitudes are usually <0.8 mag in V. The components generally belong to spectral types F-G and later.

catalogues and names	h Mus, eta Mus, HR 4993, HD 114911, SAO 252224, CP -67 2224, FK5: 493, WDS 13152-6754A
constellation	Musca