catalogues and names

The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

SKY2000 - Master Star Catalog

Smithsonian Astrophysical Observatory Star Catalog

The Washington Visual Double Star Catalog, 1996.0

Combined General Catalogue of Variable Stars (Vol. I-III)

catalogues and names

catalogues and names	Enif, e Peg, eps Peg, 8 Peg, HR 8308, HD 206778, SAO 127029, BD +9 4891, 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 (B1900)	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
galactic coordinates	longitude: 65.57°	latitude: -31.46°

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

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 arcsec		±0.001 arcsec	source: 25
galactic coord. (B1950)	longitude: 65.58°	latitude: -31.46°

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 (B1950)	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 B1950 (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 (equinox 1950.0)

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).