Enif
| catalogues and names | Enif, e Peg, eps Peg, 8 Peg, HR 8308, HD 206778, SAO 127029, FK5: 815, WDS 21442+0953A |
| other names | Enf, Enir, Al Anf, Os Pegasi, Fom |
| constellation | Pegasus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
| note (category: star names): | ENIF; Enf; Enir; Al Anf; Os Pegasi; Fom. |
position, motion, parallax:
| position (J2000) | RA: 21h 44min 11,2sec | DEC: +9° 52' 30'' |
| position (J1900) | RA: 21h 39min 16,4sec | DEC: +9° 24' 59'' |
| proper motion (J2000) | RA: 0,031 arcsec/a | DEC: -0,001 arcsec/a |
| radial velocity | 5 km/s note: variable radial velocity |
|
| rotational velocity | <17 km/s (uncertain) (variable) | |
| trigonometric parallax | 0,006 arcsec | |
magnitude
| visual magnitude | 2,39 (V on UBV Johnson system) |
spectral / color information
| spectral class | K2Ib |
| B-V-magnitude | 1,53 |
| U-B-magnitude | 1,7 |
| R-I-magnitude | 0,76 |
| note (category: spectra): | Ultraviolet FeII emission. MgII emissions indicate a cooler shell surrounding the supergiant. Barium marginally overabundant. |
| note (category: colors): | Large infrared excess. |
variability information
| variable star identification | Eps Peg |
| note (category: variability): | 0.7 - 3.5V. 1.7m flare 1972 Sept. 26-7; fainter than normal following night. |
double/multiple star system information
| number of components of multiple star system | 3 |
| separation | 142,5 arcsec |
| mag difference (of double or brightest multiple) | 6,1 |
| component ID | AC |
| note (category: double and multiple data): | ADS 15268AB optical. |
miscellaneous information
| note (category: group membership): | See HR 8232. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 21h 44min 11,164sec | DEC: +9° 52' 29,92'' | ±0,06 arcsec | source: 15 |
| proper motion (J2000) | RA: 0,0021 arcsec/a | DEC: -0,001 arcsec/a | source: 25 | |
| radial velocity | 5 km/s | source: 25 | ||
| trigonometric parallax | 0,006 | ±0,001 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 65,58° | latitude: -31,46° | ||
| GCI unit vector (J2000) | X: 0,817202 | Y: -0,550245 | Z: 0,171499 | |
magnitude:
| visual | 2,39 (observed) | source: 25 |
| photovisual | 2,5 | source: 2 |
spectral information:
| spectral class | K0 | source: 96 | |
| Morgan-Keenan | K2Ib-II | source: 25 | |
| B-magnitude | 3,92 ±0,05 | B-V-magnitude | 1,53 |
| U-magnitude | 5,62 ±0,05 | U-B-magnitude | 1,7 |
variability information:
| variability type | 172 |
| var. amplitude | 2,8 |
double/multiple star system information:
| separation between brightest and second brightest component | 83,1 arcsec |
| magnitude difference between brightest and second brightest component | 10,26 |
| position angle | 324 ° |
| component | magnitude | spectral class | catalogue(s)/name(s) |
| A | 2,39 | K0 | Enif, e Pegasi, 8 Peg, HR 8308, HD 206778, SAO 127029 |
| B | 8,1 | F8 |
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 | |
| 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: 21h 41min 43,756sec | DEC: +9° 38' 41,69'' | ±0,003 arcsec |
| position (J2000) | RA: 21h 44min 11,166sec | DEC: +9° 52' 30'' | |
| proper motion J1950 (FK4) | RA: 0,002 arcsec/a | DEC: 0,005 arcsec/a | ±0,001 arcsec/a in RA ±0,001 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: 0,0021 arcsec/a | DEC: 0 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 2,5 (accuracy: 2 decimals) |
| source of visual magnitude data | Taken from the "Henry Draper Catalogue". |
spectral information:
| spectral class | K0 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | FK4, catalogue number: 815 |
| Durchmusterung | BD+09 4891 |
| Boss General Catalogue | 30431 |
| Henry Draper Catalogue | 206778 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 21h 44,2min | DEC: +9° 53' |
| proper motion (J2000) | RA: 0,031 arcsec/a | DEC: -0,001 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 | 325° | 81,8'' | 2,4 | 12,66 | K2II | S 798 |
| 1960 | 324° | 83,1'' | ||||||
| AC | 1874 | 8 | 322° | 140,4'' | 2,4 | 8,85 | - | S 798 |
| 1913 | 320° | 142,5'' |
discoverer information:
| discoverer code | discoverer | reference |
| S 798 | South, J. | - |
notes:
| note | Epsilon Peg. The primary of this optical pair is variable. |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (J1950) | RA: 21h 41min 43,8sec | DEC: +9° 38' 42'' |
variability informations:
| variability type | LC | pulsating variable star |
| magnitute at max. brightness | 0,7 | |
| magnitute at min. brightness | 3,5 | |
| photometric system | visual, photovisual or Johnson's V |
spectral information
| spectral class | K2Ib |
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 | 62/9005 |
| constellation | Pegasus |
| notes on existence | The star is equivalent to '0629019 tau'. |
| There are notes in published catalog. | |
variability type description
| variability type | description |
| LC | 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). |