AX Microscopii

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

position, motion, parallax:

position (J2000)	RA: 21h 17min 15.185sec	DEC: -38° 52' 3.06''	ą0.19 arcsec	source: 16
position (2000.73)	RA: 21h 17min 18sec	DEC: -38° 51' 53''	JD: 2451812.24
proper motion (J2000)	RA: -0.28 arcsec/a	DEC: -1.153 arcsec/a		source: 16
radial velocity	20 km/s			source: 26
trigonometric parallax	0.261 arcsec		ą0.026 arcsec	source: 26
galactic coord. (B1950)	longitude: 3.93°	latitude: -44.3°

magnitude:

visual	6.68 (observed)	source: 26
photovisual	6.7	source: 2

spectral information:

spectral class	M0		source: 96
Morgan-Keenan	M0Ve		source: 26
B-magnitude	8.09 ą0.2	B-V-magnitude	1.41
U-magnitude	9.3 ą0.2	U-B-magnitude	1.21

variability information:

source of data: 30

variability type	220
var. amplitude	0.1

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
26	Bright Star Supplement
Hoffleit, D. and Warren, W.H. Jr., A Supplement to the Bright Star Catalogue, 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: 21h 14min 19.947sec	DEC: -39° 3' 42.45''	ą0.065 arcsec
position (2000.73)	RA: 21h 17min 32sec	DEC: -38° 50' 55''	JD: 2451812.24
position (J2000)	RA: 21h 17min 15.232sec	DEC: -38° 52' 4.5''
proper motion B1950 (FK4)	RA: -0.2805 arcsec/a	DEC: -1.152 arcsec/a	ą0.011 arcsec/a in RA ą0.011 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.2793 arcsec/a	DEC: -1.166 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	6.6 (accuracy: 2 decimals)
source of visual magnitude data	Taken from Harvard or San Luis photometry.

spectral information:

spectral class	M0p
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	GC, catalogue number: 29761
Durchmusterung	CD-3914192
Boss General Catalogue	29761
Henry Draper Catalogue	202560

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

position:

position (equinox 1950.0)

RA: 21h 14min 19.9sec

DEC: -39° 3' 42''

variability informations:

variability type	UV	eruptive variable star
magnitute at max. brightness	9.21
magnitute at min. brightness	9.31
photometric system

spectral information

spectral class

M0Ve

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 'Cordoba Durchmusterung'

miscanellous

ID in the GCVS catalogue	54/77
constellation	Microscopium
notes on existence	The star is equivalent to '0540078 AY'.
There are notes in published catalog.

variability type description

variability type

description

Eruptive variables of the UV Ceti type, these are K Ve-M Ve stars sometimes displaying flare activity with amplitudes from several tenths of a magnitude up to 6 mag in V. The amplitude is considerably greater in the ultraviolet spectral region. Maximum light is attained in several seconds or dozens of seconds after the beginning of a flare; the star returns to its normal brightness in several minutes or dozens of minutes.