epsilon 2 Lyrae

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

note (category: star names):

See HR 7051.

position, motion, parallax:

position (J2000)	RA: 18h 44min 22.9sec	DEC: +39° 36' 47''
position (2000.72)	RA: 18h 44min 24sec	DEC: +39° 36' 50''
position (B1900)	RA: 18h 41min 3.9sec	DEC: +39° 30' 29''
proper motion (J2000)	RA: 0.008 arcsec/a	DEC: 0.064 arcsec/a
radial velocity	-24 km/s note: suspected variable radial velocity
rotational velocity	177 km/s (uncertain) (variable)
trigonometric parallax	0.021 arcsec
galactic coordinates	longitude: 68.79°	latitude: 18.17°

note (category: dynamical parallaxes):

0.025".

magnitude

visual magnitude

5.14
(original HR magnitude)

spectral / color information

spectral class	A8Vn
B-V-magnitude	0.19
U-B-magnitude	0.08

variability information

variable star identification

11301

note (category: variability):

Uncertain whether 7053 or 7054 is variable suspect NSV 11301.

double/multiple star system information

number of components of multiple star system	10
separation	209.3 arcsec
mag difference (of double or brightest multiple)	0
component ID	AC

note (category: double and multiple data):

CD 5.23 A3n, 5.47 A5, 585y, a = 2.95". Component C is speckle binary, sep. 0.184".

miscellaneous information

note (category: group membership):

Hyades group.

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

position, motion, parallax:

position (J2000)	RA: 18h 44min 22.793sec	DEC: +39° 36' 46.02''	ą0.35 arcsec	source: 17
position (2000.72)	RA: 18h 44min 24sec	DEC: +39° 36' 49''	JD: 2451809.27
proper motion (J2000)	RA: 0 arcsec/a	DEC: 0.056 arcsec/a		source: 25
radial velocity	-24 km/s			source: 25
trigonometric parallax	0.021 arcsec		ą0.002 arcsec	source: 25
galactic coord. (B1950)	longitude: 68.8°	latitude: 18.17°

magnitude:

visual	5.23 (observed)	source: 25
photovisual	5.1	source: 2
photographic	4.6	source: 16

spectral information:

spectral class	A5		source: 96
Morgan-Keenan	A8Vn		source: 25
B-magnitude	5.42 ą0.05	B-V-magnitude	0.19
U-magnitude	5.5 ą0.05	U-B-magnitude	0.08

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	2.3 arcsec
magnitude difference between brightest and second brightest component	0.3
position angle	86 °

component	magnitude	spectral class	catalogue(s)/name(s)
A	5.23	A5	e²Lyrae, 5 Lyr, HR 7053, HD 173607, SAO 67315
B	5.47	A5	e²Lyrae, 5 Lyr, HR 7054, HD 173608,

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
16	PPM North and PPM South Catalogs and PPM Supplement
Roser, S., and U. Bastian, "Catalogue of Positions and Proper Motions," A&AS, Vol. 74, p. 449, 1988, and Bastian, U., et al., "Catalogue of Positions and Proper Motions - South," 1993
17	ACRS
Corbin, T.E., and S.E. Urban, Astrographic Catalog Reference Stars, United States Naval Observatory, 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
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: 18h 42min 43.325sec	DEC: +39° 33' 33.99''	ą0.013 arcsec
position (2000.72)	RA: 18h 44min 24sec	DEC: +39° 36' 46''	JD: 2451809.27
position (J2000)	RA: 18h 44min 22.896sec	DEC: +39° 36' 46.52''
proper motion B1950 (FK4)	RA: 0.0003 arcsec/a	DEC: 0.064 arcsec/a	ą0.002 arcsec/a in RA ą0.002 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0006 arcsec/a	DEC: 0.064 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	4.5 (accuracy: 2 decimals)
source of visual magnitude data	Taken from Harvard or San Luis photometry.

spectral information:

spectral class	A5
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

remarks for duplicity and variability

Double star in Aitken's Double Star Catalogue (Aitken 1932)

catalogues

source catalogue	GC, catalogue number: 25668
Durchmusterung	BD+39 3510
Boss General Catalogue	25668
Henry Draper Catalogue	173607 The "SAO Catalog" entry refers to two consecutive HD numbers, the lower of which is given.

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

position and proper motion:

position (J2000)	RA: 18h 44.3min	DEC: +39° 40'
proper motion (J2000)	RA: 0.014 arcsec/a	DEC: 0.061 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	1821	often	27°	3.4''	5.1	6	A3III F1V	STF2382
	1992		353°	2.5''
AB-CD	1835	44	173°	207.1''	4.66	4.59	-	STF 37
	1984		172°	208.5''
AD	1903	3	173°	210''	5.1	5.4	-	STF 37
AI	1863	7	135°	145.4''	5.1	-	-	STF 37
	1956		137°	147.1''
BC	1910	1	172°	208.9''	6.1	5.1	-	STF 37
BD	1903	2	172°	212.4''	6.1	5.4	-	STF 37
BI	1910	2	137°	147.6''	6.1	-	-	STF 37
Cc	1985	3	66°	0.2''	5.1	-	A6IV	CHR 77
	1992		344°	0.1''
Cc-D	1821	often	159°	2.6''	5.1	5.4	F0Vn	STF2383
	1992		86°	2.3''
Cc-I	1863	-	37°	129.1''	5.1	-	-	STF 37
	1956		36°	123.1''
DI	1910	1	36°	126.5''	5.4	-	-	STF 37
EF	1878	2	38°	46.7''	10.1	-	-	SHJ 277
	1904		-	46''
EG	1878	2	247°	42.6''	10.1	-	-	SHJ 277
	1904		245°	43.6''
GH	1878	2	356°	25''	-	-	-	SHJ 277
	1904		353°	26.4''

discoverer information:

discoverer code	discoverer	reference
STF2382	Struve, F.G.W.	-
STF 37	Struve, F.G.W.	-
CHR 77	-	-
STF2383	Struve, F.G.W.	-
SHJ 277	South & Herschel	-

notes:

note	Epsilon (1) Lyr. 4 Lyr. AB: A premature orbit has been computed. AB-CD: STF 37. See ADS for notes of components. Cc-D: Epsilon (2) Lyr. 5 Lyr. P = 724yr., a = 2.92", motion retrograde. C is an Alpha CVn-type variable, and has a companion, c.

data from 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)

position:

position (B1900)

RA: 18h 41min

DEC: +39° 34'

magnitudes, spectral classes, orbital elements:

author:	U. Guntzel-Lingner	U. Guntzel-Lingner
date of observation:	1955	1955
magnitude of component A:	5	5.23
magnitude of component B:	5	5.23
spectral class component B:	A4V	A8Vn
spectral class component B:	A4V	A8Vn
period [y]:	1165.6	585
semi-major axis [arcsec]:	2.78	2.95
inclination [deg]:	138	120.5
node [deg]:	29	17.4
equinox of node:	1950	1950
eccentricity:	0.19	0.49
time of periastron passage:	1152.4	1644.5
dates of ephemeris:	1957-1981	1957-1981
grade:	indeterminate	preliminary
reference:	Astron. Nachr. 283, 78; 1956.	Ibid.

notes

AB and CD form the physical quadruple Epsilon Lyrae, separation 208". The position of CD is 18411+3930. The observed small RV variations in each pair are probably merely scatter due to the very poor lines. Star C is an Alpha CVn type variable. The longitude of periastron in the orbit of CD has been corrected.

other name(s)

STF 2383 CD, 5 Lyr

data from Combined General Catalogue of Variable Stars (suspected variables) (Kholopov+ 1998)

position:

position (equinox 1950.0)

RA: 18h 42min 43.3sec

DEC: +39° 33' 34''

variability informations:

magnitute at max. brightness	4.6
magnitute amplitude	0.02
photometric system	visual, photovisual or Johnson's V

spectral information

spectral class

references

to a study

0132D (designation: 2383)

miscanellous

There are notes in the published catalog (Kukarkin et al.(1982)).

catalogues and names	e²Lyr, NSV 11301, 5 Lyr, HR 7053, HD 173607, SAO 67315, BD +39 3510, WDS 18443+3940C
constellation	Lyra