Peacock

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 Peacock, a Pav, NSV 13060, HR 7790, HD 193924, SAO 246574, FK5: 764, WDS 20256-5644A
constellation Pavo

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

note (category: star names): Peacock.

position, motion, parallax:

position (J2000) RA: 20h 25min 38,9sec DEC: -56° 44' 6''
position (J1900) RA: 20h 17min 44,3sec DEC: -57° 3' 20''
proper motion (J2000) RA: 0,007 arcsec/a DEC: -0,089 arcsec/a
radial velocity 2 km/s
note: spectroscopic binaries
note: orbital data avaible
rotational velocity 39 km/s (uncertain) (variable)

magnitude

visual magnitude 1,94
(V on UBV Johnson system)

spectral / color information

spectral class B2IV
B-V-magnitude -0,2
U-B-magnitude -0,71
R-I-magnitude -0,16
note (category: spectra): Lyman alpha and Lyman beta observed from COPERNICUS.
note (category: colors): Color excess E(B-V) = +0.02.

variability information

variable star identification 13060

double/multiple star system information

number of components of multiple star system 3
separation 245,4 arcsec
mag difference (of double or brightest multiple) 7,1
component ID AB
note Worley (1978) update of the IDS
note (category: double and multiple data): BC, 9.2, 10.2v sep. 17.6".
note (category: spectroscopic binaries): B0.5, B2, 11.753d, K 7.2k/s, V0 +2.0k/s, asini 1.16.

miscellaneous information

note (category: group membership): Member of Pleiades group.
note (category: stellar radii or diameters): Diam. = 0.00077 - 0.00080".

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

position, motion, parallax:

position (J2000) RA: 20h 25min 38,852sec DEC: -56° 44' 6,38'' ±0,06 arcsec source: 15
proper motion (J2000) RA: 0,0008 arcsec/a DEC: -0,089 arcsec/a source: 25
radial velocity 2 km/s source: 25
galactic coord. (B1950) longitude: 340,91° latitude: -35,19°
GCI unit vector (J2000) X: 0,325588 Y: -0,441425 Z: -0,836144

magnitude:

visual 1,94 (observed) source: 25
photovisual 2,1 source: 2
photographic 2 source: 2

spectral information:

spectral class B3 source: 96
Morgan-Keenan B2IV source: 25
B-magnitude 1,74 ±0,05 B-V-magnitude -0,2
U-magnitude 1,03 ±0,05 U-B-magnitude -0,71

variability information:

source of data: 28
variability type 9
var. amplitude 0,03

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 245,4 arcsec
magnitude difference between brightest and second brightest component 7,3
position angle 84 °

component magnitude spectral class catalogue(s)/name(s)
A 1,94 B3 Peacock, a Pavonis, HR 7790, HD 193924, SAO 246574
B 9,2 -

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 (J1950) RA: 20h 21min 42,289sec DEC: -56° 53' 50,02'' ±0,008 arcsec
position (J2000) RA: 20h 25min 38,895sec DEC: -56° 44' 6,32''
proper motion J1950 (FK4) RA: 0,0019 arcsec/a DEC: -0,085 arcsec/a ±0,002 arcsec/a in RA
±0,002 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0014 arcsec/a DEC: -0,088 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 2,1 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class B3
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue FK4, catalogue number: 764
Durchmusterung CP-57 9674
Boss General Catalogue 28374
Henry Draper Catalogue 193924

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

position and proper motion:

position (J2000) RA: 20h 25,6min DEC: -56° 44'
proper motion (J2000) RA: 0,007 arcsec/a DEC: -0,089 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
AB 1879 1 84° 245,4'' 1,94 9,2 B2IV HJ 5193
AC 1879 1 80° 225,7'' 2 9 - HJ 5193
BC 1873 5 332° 17,6'' 9,2 10,5 - HJ 5193

discoverer information:

discoverer code discoverer reference
HJ 5193 Herschel, J. -

notes:

note Alpha Pav. A is a spectroscopic binary.

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

position:

position (J1950) RA: 20h 21min 42,3sec DEC: -56° 53' 50''

variability informations:

magnitute at max. brightness 1,93
magnitute at min. brightness 1,96
photometric system visual, photovisual or Johnson's V

spectral information

spectral class B3

references

to a study 0832D (designation: ALPHA PAV)

miscanellous

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