a Microscopii


The object was found in the following catalogues:
  1. The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

  2. SKY2000 - Master Star Catalog

  3. Smithsonian Astrophysical Observatory Star Catalog

  4. The Washington Visual Double Star Catalog, 1996.0

  5. Combined General Catalogue of Variable Stars (suspected variables)


catalogues and names a Mic, NSV 13329, HR 7965, HD 198232, SAO 212472, WDS 20500-3347
constellation Microscopium

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


position, motion, parallax:

position (J2000) RA: 20h 49min 58,1sec DEC: -33 46' 47''
position (J1900) RA: 20h 43min 43,4sec DEC: -34 8' 59''
proper motion (J2000) RA: 0,01 arcsec/a DEC: -0,025 arcsec/a
radial velocity -15 km/s
trigonometric parallax 0,012 arcsec

magnitude

visual magnitude 4,9
(V on UBV Johnson system)

spectral / color information

spectral class G7III
B-V-magnitude 1
U-B-magnitude 0,73

variability information

variable star identification 13329

double/multiple star system information

separation 20,5 arcsec
mag difference (of double or brightest multiple) 5
note Worley (1978) update of the IDS

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

position, motion, parallax:

position (J2000) RA: 20h 49min 58,091sec DEC: -33 46' 46,99'' 0,19 arcsec source: 16
proper motion (J2000) RA: 0,0007 arcsec/a DEC: -0,021 arcsec/a source: 25
radial velocity -15 km/s source: 25
trigonometric parallax 0,012 0,001 arcsec source: 25
galactic coord. (B1950) longitude: 9,89 latitude: -38,26
GCI unit vector (J2000) X: 0,561453 Y: -0,612889 Z: -0,556001

magnitude:

visual 4,9 (observed) source: 25
photovisual 4,6 source: 16

spectral information:

spectral class K0 source: 96
Morgan-Keenan G7III source: 25
B-magnitude 5,9 0,05 B-V-magnitude 1
U-magnitude 6,63 0,05 U-B-magnitude 0,73

variability information:

source of data: 28
variability type 9
var. amplitude 0,06

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 20,5 arcsec
magnitude difference between brightest and second brightest component 5,1
position angle 166

sources:

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
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 (J1950) RA: 20h 46min 50,972sec DEC: -33 57' 58,21'' 0,022 arcsec
position (J2000) RA: 20h 49min 58,074sec DEC: -33 46' 47,34''
proper motion J1950 (FK4) RA: 0,0008 arcsec/a DEC: -0,022 arcsec/a 0,004 arcsec/a in RA
0,004 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0008 arcsec/a DEC: -0,025 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 5 (accuracy: 2 decimals)
source of visual magnitude data Taken from Harvard or San Luis photometry.

spectral information:

spectral class K0
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

remarks for duplicity and variability

Double star in Aitken's Double Star Catalogue (Aitken 1932)

catalogues

source catalogue GC, catalogue number: 29026
Durchmusterung CD-3414660
Boss General Catalogue 29026
Henry Draper Catalogue 198232

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

position and proper motion:

position (J2000) RA: 20h 50min DEC: -33 47'
proper motion (J2000) RA: 0,013 arcsec/a DEC: -0,022 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
- 1835 11 166 20,5'' 4,9 10 G7III HJ 5224

discoverer information:

discoverer code discoverer reference
HJ 5224 Herschel, J. -

notes:

note Alpha Mic.

data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)

position:

position (J1950) RA: 20h 46min 51sec DEC: -33 57' 58''

variability informations:

magnitute at max. brightness 4,88
magnitute at min. brightness 4,94
photometric system visual, photovisual or Johnson's V

spectral information

spectral class G7

references

to a study 660820D (designation: BS 7965)

miscanellous

There are notes in the published catalog (Kukarkin et al.(1982)).