epsilon 1 Lyrae

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

note (category: star names):

With HR 7052-4 called the Double Double in Lyra.

position, motion, parallax:

position (J2000)	RA: 18h 44min 20.4sec	DEC: +39° 40' 12''
position (2000.72)	RA: 18h 44min 21sec	DEC: +39° 40' 15''
position (B1900)	RA: 18h 41min 1.5sec	DEC: +39° 33' 55''
proper motion (J2000)	RA: 0.017 arcsec/a	DEC: 0.059 arcsec/a
radial velocity	-31 km/s note: variable radial velocity
rotational velocity	200 km/s (uncertain) (variable)
trigonometric parallax	0.021 arcsec
galactic coordinates	longitude: 68.85°	latitude: 18.2°

note (category: dynamical parallaxes):

0.015".

magnitude

visual magnitude

5.06
(original HR magnitude)

spectral / color information

spectral class	A4V
B-V-magnitude	0.16
U-B-magnitude	0.06

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):

AB 5.00 A2n, 6.10 A4n, 1165.6y, a = 2.78". Binary with HR 7052 = B, and CPM with HR 7053-4 at 208". Combined mag. and colors for HR 7051-2 are 6.48V, +0.19(B-V), +0.04(U-B).

miscellaneous information

note (category: group membership):

Hyades group.

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

position, motion, parallax:

position (J2000)	RA: 18h 44min 20.319sec	DEC: +39° 40' 13.02''	ą0.2 arcsec	source: 52
position (2000.72)	RA: 18h 44min 21sec	DEC: +39° 40' 16''	JD: 2451809.27
proper motion (J2000)	RA: 0.0005 arcsec/a	DEC: 0.057 arcsec/a		source: 25
radial velocity	-31 km/s			source: 25
trigonometric parallax	0.021 arcsec		ą0.002 arcsec	source: 25
galactic coord. (B1950)	longitude: 68.85°	latitude: 18.2°

magnitude:

visual	5 (observed)	source: 25
photovisual	5.1	source: 2
photographic	5.1	source: 2

spectral information:

spectral class	A3		source: 29
Morgan-Keenan	A4V		source: 25
B-magnitude	5.16 ą0.05	B-V-magnitude	0.16
U-magnitude	5.22 ą0.05	U-B-magnitude	0.06

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	2.5 arcsec
magnitude difference between brightest and second brightest component	0.9
position angle	353 °

component	magnitude	spectral class	catalogue(s)/name(s)
A	5	A3	e¹Lyrae, 4 Lyr, HR 7051, HD 173582, SAO 67310
B	6.1	A3	e¹Lyrae, 4 Lyr, HR 7052, HD 173583, SAO 67309

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
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
29	SAOJ2000
SAO on FK5 at J2000, 1989
52	PPMN-HP subset
PPMN Star Catalogue (Reference 16) High-Precision Subset (Code H)

data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)

position and proper motion:

position (B1950)	RA: 18h 42min 40.873sec	DEC: +39° 37' 0.09''	ą0.012 arcsec
position (2000.72)	RA: 18h 44min 22sec	DEC: +39° 40' 12''	JD: 2451809.27
position (J2000)	RA: 18h 44min 20.372sec	DEC: +39° 40' 12.19''
proper motion B1950 (FK4)	RA: 0.0011 arcsec/a	DEC: 0.059 arcsec/a	ą0.002 arcsec/a in RA ą0.002 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0015 arcsec/a	DEC: 0.059 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	5.1 (accuracy: 2 decimals)
source of visual magnitude data	Taken from Harvard or San Luis photometry.

spectral information:

spectral class	A3
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: 25667
Durchmusterung	BD+39 3509A
Boss General Catalogue	25667
Henry Draper Catalogue	173582

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

catalogues and names	e¹Lyr, 4 Lyr, HR 7051, HD 173582, SAO 67310, BD +39 3509 A, WDS 18443+3940A
constellation	Lyra