catalogues and names

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

SKY2000 - Master Star Catalog

Smithsonian Astrophysical Observatory Star Catalog

Combined General Catalogue of Variable Stars (Vol. I-III)

catalogues and names

catalogues and names	q1Mic, tet 1 Mic, HR 8151, HD 203006, SAO 230644, CD -41 14475, FK5: 802
constellation	Microscopium

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

position, motion, parallax:

position (J2000)	RA: 21h 20min 45.6sec	DEC: -40° 48' 35''
position (2000.72)	RA: 21h 20min 49sec	DEC: -40° 48' 24''
position (B1900)	RA: 21h 14min 21.9sec	DEC: -41° 13' 56''
proper motion (J2000)	RA: 0.069 arcsec/a	DEC: -0.005 arcsec/a
radial velocity	2 km/s note: suspected variable radial velocity
rotational velocity	48 km/s (uncertain) (variable)
trigonometric parallax	0.012 arcsec
galactic coordinates	longitude: 1.19°	latitude: -44.95°

magnitude

visual magnitude

4.82 (V on UBV Johnson system)

spectral / color information

spectral class	ApCrEuSr
B-V-magnitude	0.02
U-B-magnitude	-0.07
R-I-magnitude

variability information

variable star identification

The1 Mic

note (category: variability):

Alpha CV 4.77 - 4.87V, 2.1215d.

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

position, motion, parallax:

position (J2000)	RA: 21h 20min 45.636sec	DEC: -40° 48' 34.53''	±0.06 arcsec	source: 15
position (2000.72)	RA: 21h 20min 49sec	DEC: -40° 48' 24''	JD: 2451809.25
proper motion (J2000)	RA: 0.0061 arcsec/a	DEC: -0.005 arcsec/a		source: 25
radial velocity	2 km/s			source: 25
trigonometric parallax	0.012 arcsec		±0.001 arcsec	source: 25
galactic coord. (B1950)	longitude: 1.19°	latitude: -44.95°

magnitude:

visual	4.77 (observed)	source: 30
photovisual	4.9	source: 2
photographic	5	source: 2

spectral information:

spectral class	A2		source: 96
Morgan-Keenan	ApCrEuSr		source: 25
B-magnitude	4.84 ±0.05	B-V-magnitude	0.02
U-magnitude	4.77 ±0.05	U-B-magnitude	-0.07

variability information:

source of data: 30

variability type	160
var. amplitude	0.1
var. period	2.12
var. epoch	2440345 3. May 1969, 12:00:00 UT
next max light	2451809.96 22. September 2000, 11:02:24 UT

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
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: 21h 17min 34.153sec	DEC: -41° 1' 19.95''	±0.012 arcsec
position (2000.72)	RA: 21h 20min 48sec	DEC: -40° 48' 24''	JD: 2451809.25
position (J2000)	RA: 21h 20min 45.632sec	DEC: -40° 48' 34.65''
proper motion B1950 (FK4)	RA: 0.006 arcsec/a	DEC: -0.003 arcsec/a	±0.003 arcsec/a in RA ±0.003 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0061 arcsec/a	DEC: -0.006 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	4.9 (accuracy: 2 decimals)
source of visual magnitude data	Taken from the "Henry Draper Catalogue".

spectral information:

spectral class	A2p
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	FK4, catalogue number: 802
Durchmusterung	CD-4114475
Boss General Catalogue	29854
Henry Draper Catalogue	203006

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

position:

position (equinox 1950.0)

RA: 21h 17min 34.2sec

DEC: -41° 1' 20''

variability informations:

variability type	ACV	rotating variable star
magnitute at max. brightness	4.77
magnitute at min. brightness	4.87
photometric system	visual, photovisual or Johnson's V
epoch for maximum light [JD]	2440345.32 3. May 1969, 19:40:48 UT
period [d]	2.1215
next maximum light [JD]	2451809.906 22. September 2000, 09:44:38 UT

spectral information

spectral class

A2p(Cr-Eu-Sr-Mg)

references

to a study	Vol. II GCVS
to a chart/photograph	no chart is avaible, but the star is contained in the 'Cordoba Durchmusterung'

miscanellous

ID in the GCVS catalogue	54/90081
constellation	Microscopium
notes on existence	The star is equivalent to '0550001 R'.

variability type description

variability type

description

ACV

Alpha2 Canum Venaticorum variables. These are main-sequence stars with spectral types B8p-A7p and displaying strong magnetic fields. Spectra show abnormally strong lines of Si, Sr, Cr, and rare earths whose intensities vary with rotation. They exhibit magnetic field and brightness changes (periods of 0.5-160 days or more). The amplitudes of the brightness changes are usually withine 0.01-0.1 mag in V. ACVO Rapidly oscillating Alpha2 CVn variables. These are nonradially pulsating, rotating magnetic variables of Ap spectral type (DO Eri). Pulsation periods are in the range of 6-12 mmag (0.004-0.01 days), while amplitudes of light variation caused by the pulsation are about 0.01 mag in V. The pulsational variations are superposed on those caused by rotation.