Algenib


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 (Vol. I-III)


catalogues and names Algenib, g Peg, gam Peg, 88 Peg, HR 39, HD 886, SAO 91781, FK5: 7, WDS 00132+1511A
constellation Pegasus

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

note (category: star names): ALGENIB.

object is infrared source (Engels et al., 1982)

position, motion, parallax:

position (J2000) RA: 0h 13min 14,2sec DEC: +15 11' 1''
position (J1900) RA: 0h 8min 5,1sec DEC: +14 37' 40''
proper motion (J2000) RA: 0,003 arcsec/a DEC: -0,012 arcsec/a
radial velocity 4 km/s
note: spectroscopic binaries
note: orbital data avaible
rotational velocity 3 km/s (uncertain) (variable)
trigonometric parallax -0,002 arcsec
note (category: radial and/or rotational velocities): RV also varies with period 0.151750125d.

magnitude

visual magnitude 2,83
(V on UBV Johnson system)

spectral / color information

spectral class B2IV
B-V-magnitude -0,23
U-B-magnitude -0,87
R-I-magnitude -0,19
note (category: spectra): Lyman beta observed from COPERNICUS. Chlorine in spectrum.
note (category: colors): Color excess E(B-V) = +0.01.

variability information

variable star identification Gam Peg
note (category: variability): Beta C 2.80 - 2.87V, 0.1517495d.

double/multiple star system information

number of components of multiple star system 3
separation 163,4 arcsec
mag difference (of double or brightest multiple) 8,9
component ID AB
note Worley (1978) update of the IDS
note (category: spectroscopic binaries): 6.830713d, K 1.34k/s, V0 2.5k/s, asini 0.181Solar R.

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

position, motion, parallax:

position (J2000) RA: 0h 13min 14,154sec DEC: +15 11' 0,8'' 0,06 arcsec source: 15
proper motion (J2000) RA: 0,0002 arcsec/a DEC: -0,012 arcsec/a source: 25
radial velocity 4 km/s source: 25
galactic coord. (B1950) longitude: 109,45 latitude: -46,68
GCI unit vector (J2000) X: 0,963483 Y: 0,055705 Z: 0,261912

magnitude:

visual 2,83 (observed) source: 20
photovisual 2,9 source: 2

spectral information:

spectral class B2 source: 96
Morgan-Keenan B2IV source: 25
B-magnitude 2,6 0,011 B-V-magnitude -0,23
U-magnitude 1,73 0,013 U-B-magnitude -0,86

variability information:

source of data: 30
variability type 140
var. amplitude 0,11
var. period 0,15
var. epoch 2441225
30. September 1971, 12:00:00 UT
next max light 2451621,35
17. March 2000, 20:24:00 UT

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 163,4 arcsec
magnitude difference between brightest and second brightest component 9
position angle 286

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
20 Catalogue of Homogeneous Means in the UBV System
Mermilliod, J.C., Catalogue of Homogeneous Means in the UBV System, Institut d'Astronomie, Universite de Lausanne, 1994
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 (J1950) RA: 0h 10min 39,447sec DEC: +14 54' 20,57'' 0,003 arcsec
position (J2000) RA: 0h 13min 14,156sec DEC: +15 11' 0,8''
proper motion J1950 (FK4) RA: 0,0002 arcsec/a DEC: -0,007 arcsec/a 0,001 arcsec/a in RA
0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0002 arcsec/a DEC: -0,012 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 2,9 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class B2
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue FK4, catalogue number: 7
Durchmusterung BD+14 14
Boss General Catalogue 238
Henry Draper Catalogue 886

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

position and proper motion:

position (J2000) RA: 0h 13,2min DEC: +15 11'
proper motion (J2000) RA: 0,003 arcsec/a DEC: -0,012 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 2 286 161,8'' 2,83 11,8 B2IV BUP 3
1907 - 163,4''
BC 1879 2 199 21'' 11,8 12,4 - BUP 3
1907 196 20,4''

discoverer information:

discoverer code discoverer reference
BUP 3 - -

notes:

note Gamma Peg. Beta CMa variable and spectroscopic binary.

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

position:

position (J1950) RA: 0h 10min 39,4sec DEC: +14 54' 21''

variability informations:

variability type BCEP pulsating variable star
magnitute at max. brightness 2,78
magnitute at min. brightness 2,89
photometric system visual, photovisual or Johnson's V
epoch for maximum light [JD] 2441224,64
30. September 1971, 03:21:36 UT
period [d] 0,151750125
next maximum light [JD] 2451621,344564
17. March 2000, 20:16:10 UT
rising time 50 % of period

spectral information

spectral class B2IV

references

to a study Vol. III GCVS
to a chart/photograph Vol. I GCVS (see Kholopov et al. 1985-1988)

miscanellous

ID in the GCVS catalogue 62/9003
constellation Pegasus
notes on existence The star is equivalent to '0629005 eps'.

variability type description

variability type description
BCEP Variables of the Beta Cephei type (Beta Cep, Beta CMa), which are pulsating O8-B6 I-V stars with periods of light and radial-velocity variations in the range of 0.1 - 0.6 days and light amplitudes from 0.01 to 0.3 mag in V. The light curves are similar in shape to average radial-velocity curves but lag in phase by a quarter of the period, so that maximum brightness corresponds to
maximum contraction, i.e., to minimum stellar radius. The majority of these stars probably show radial pulsations, but some (V649 Per) display nonradial pulsations; multiperiodicity is characteristic of many of these stars.