Scheat


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 Scheat, b Peg, bet Peg, 53 Peg, HR 8775, HD 217906, SAO 90981, FK5: 870, WDS 23038+2805A
other names Sheat, Seat Alpheras, Menkib
constellation Pegasus

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

note (category: star names): SCHEAT; Sheat; Seat Alpheras; Menkib.

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

position, motion, parallax:

position (J2000) RA: 23h 3min 46,5sec DEC: +28 4' 58''
position (J1900) RA: 22h 58min 55,5sec DEC: +27 32' 25''
proper motion (J2000) RA: 0,189 arcsec/a DEC: 0,137 arcsec/a
radial velocity 9 km/s
note: variable radial velocity
trigonometric parallax 0,022 arcsec

magnitude

visual magnitude 2,42
(V on UBV Johnson system)

spectral / color information

spectral class M2.5II-III
B-V-magnitude 1,67
U-B-magnitude 1,96
R-I-magnitude 1,32
note (category: spectra): Ultraviolet FeII emission.

variability information

variable star identification Bet Peg
note (category: variability): Lb 2.31 - 2.74V.

double/multiple star system information

number of components of multiple star system 3
separation 253,1 arcsec
mag difference (of double or brightest multiple) 7
component ID AC

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

position, motion, parallax:

position (J2000) RA: 23h 3min 46,464sec DEC: +28 4' 58,1'' 0,06 arcsec source: 15
proper motion (J2000) RA: 0,0143 arcsec/a DEC: 0,137 arcsec/a source: 25
radial velocity 9 km/s source: 25
trigonometric parallax 0,022 0,002 arcsec source: 25
galactic coord. (B1950) longitude: 95,75 latitude: -29,05
GCI unit vector (J2000) X: 0,85585 Y: -0,214283 Z: 0,470747

magnitude:

visual 2,3 (observed) source: 31
photovisual 2,6 source: 2

spectral information:

spectral class M0 source: 96
Morgan-Keenan M2.5II-III source: 25
B-magnitude 4,09 0,05 B-V-magnitude 1,67
U-magnitude 6,05 0,05 U-B-magnitude 1,96

variability information:

source of data: 30
variability type 171
var. amplitude 0,43

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 108,6 arcsec
magnitude difference between brightest and second brightest component 9,4
position angle 211

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
30 GCVS, 4th edition
Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88
31 CRM' (non-GCVS variable data)
Warren, W.H. Jr., Northern Hemisphere Catalog of Red Magnitudes, 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 1min 20,77sec DEC: +27 48' 40,45'' 0,004 arcsec
position (J2000) RA: 23h 3min 46,46sec DEC: +28 4' 58,07''
proper motion J1950 (FK4) RA: 0,0142 arcsec/a DEC: 0,142 arcsec/a 0,001 arcsec/a in RA
0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0142 arcsec/a DEC: 0,137 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 2,6 (accuracy: 2 decimals)
source of visual magnitude data Arithmetic mean of maximum and minimum magnitudes of a variable star

spectral information:

spectral class M0
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

remarks for duplicity and variability

Variable star in visual magnitude in source catalog

catalogues

source catalogue FK4, catalogue number: 870
Durchmusterung BD+27 4480
Boss General Catalogue 32135
Henry Draper Catalogue 217906

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

position and proper motion:

position (J2000) RA: 23h 3,8min DEC: +28 5'
proper motion (J2000) RA: 0,189 arcsec/a DEC: 0,137 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 5 208 98,4'' 2,42 11,8 - HJ 1842
1924 211 108,6''
AC 1852 6 95 264,1'' 2,42 9,6 - HJ 1842
1924 98 253,1''

discoverer information:

discoverer code discoverer reference
HJ 1842 Herschel, J. -

notes:

note Beta Peg. A is an irregular variable, spectrum M2.5II-III. AB is optical.

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

position:

position (J1950) RA: 23h 1min 20,8sec DEC: +27 48' 40''

variability informations:

variability type LB pulsating variable star
magnitute at max. brightness 2,31
magnitute at min. brightness 2,74
photometric system visual, photovisual or Johnson's V

spectral information

spectral class M2.5II-IIIe

references

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

miscanellous

ID in the GCVS catalogue 62/9002
constellation Pegasus
notes on existence The star is equivalent to '0629003 gam'.
There are notes in published catalog.

variability type description

variability type description
LB Slow irregular variables. The light variations of these stars show no evidence of periodicity, or any periodicity present is very poorly defined and appears only occasionally. Like for the type I, stars are often attributed to this type because of being insufficiently studied.
Many type L variables are really semiregulars or belong to other types.

LB
Slow irregular variables of late spectral types (K, M, C, S); as a rule, they are giants (CO Cyg). This type is also ascribed, in the GCVS, to slow red irregular variables in the case of unknown spectral types and luminosities.

LC
Irregular variable supergiants of late spectral types having amplitudes of about 1 mag in V (TZ Cas).