Markab

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. Combined General Catalogue of Variable Stars (suspected variables)

catalogues and names Markab, a Peg, NSV 14417, 54 Peg, HR 8781, HD 218045, SAO 108378, FK5: 871
other names Marchab
constellation Pegasus

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

note (category: star names): MARKAB; Marchab.

object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

position, motion, parallax:

position (J2000) RA: 23h 4min 45,7sec DEC: +15° 12' 19''
position (J1900) RA: 22h 59min 46,7sec DEC: +14° 40' 2''
proper motion (J2000) RA: 0,063 arcsec/a DEC: -0,042 arcsec/a
radial velocity -4 km/s
note: spectroscopic binaries
rotational velocity 148 km/s (uncertain) (variable)
trigonometric parallax 0,038 arcsec

magnitude

visual magnitude 2,49
(V on UBV Johnson system)

spectral / color information

spectral class B9V
B-V-magnitude -0,04
U-B-magnitude -0,05
R-I-magnitude -0,03

variability information

variable star identification 14417

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

position, motion, parallax:

position (J2000) RA: 23h 4min 45,658sec DEC: +15° 12' 18,9'' ±0,06 arcsec source: 15
proper motion (J2000) RA: 0,0044 arcsec/a DEC: -0,043 arcsec/a source: 25
radial velocity -4 km/s source: 25
trigonometric parallax 0,038 ±0,004 arcsec source: 25
galactic coord. (B1950) longitude: 88,29° latitude: -40,38°
GCI unit vector (J2000) X: 0,937098 Y: -0,230342 Z: 0,262278

magnitude:

visual 2,49 (observed) source: 25
photovisual 2,6 source: 2

spectral information:

spectral class A0 source: 96
Morgan-Keenan B9V source: 25
B-magnitude 2,45 ±0,05 B-V-magnitude -0,04
U-magnitude 2,4 ±0,05 U-B-magnitude -0,05

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
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: 23h 2min 16,061sec DEC: +14° 56' 9,11'' ±0,003 arcsec
position (J2000) RA: 23h 4min 45,656sec DEC: +15° 12' 18,89''
proper motion J1950 (FK4) RA: 0,0043 arcsec/a DEC: -0,038 arcsec/a ±0,001 arcsec/a in RA
±0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0043 arcsec/a DEC: -0,042 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 2,6 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class A0
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue FK4, catalogue number: 871
Durchmusterung BD+14 4926
Boss General Catalogue 32149
Henry Draper Catalogue 218045

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

position:

position (J1950) RA: 23h 2min 16,1sec DEC: +14° 56' 9''

variability informations:

magnitute at max. brightness 2,47
magnitute at min. brightness 2,52
photometric system visual, photovisual or Johnson's V

spectral information

spectral class B9

references

to a study 1570D (designation: ALPHA PEG)

miscanellous

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