e1Lyrae


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. 4th Catalog of Orbits of Visual Binaries


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

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 (J1900) 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
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'' 0,2 arcsec source: 52
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 0,002 arcsec source: 25
galactic coord. (B1950) longitude: 68,85 latitude: 18,2
GCI unit vector (J2000) X: 0,147988 Y: -0,755371 Z: 0,638369

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 0,05 B-V-magnitude 0,16
U-magnitude 5,22 0,05 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 (J1950) RA: 18h 42min 40,873sec DEC: +39 37' 0,09'' 0,012 arcsec
position (J2000) RA: 18h 44min 20,372sec DEC: +39 40' 12,19''
proper motion J1950 (FK4) RA: 0,0011 arcsec/a DEC: 0,059 arcsec/a 0,002 arcsec/a in RA
0,002 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 (J1900) 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.