Enif


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 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.

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

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:

source of data: 30
variability type 172
var. amplitude 2,8

double/multiple star system information:

source of data: 19
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).