Scheat
| 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. |
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:
| variability type | 171 |
| var. amplitude | 0,43 |
double/multiple star system information:
| 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). |