e2Lyrae

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

  6. Combined General Catalogue of Variable Stars (suspected variables)

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

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 (J1900) 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
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'' ±0,35 arcsec source: 17
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 ±0,002 arcsec source: 25
galactic coord. (B1950) longitude: 68,8° latitude: 18,17°
GCI unit vector (J2000) X: 0,148247 Y: -0,755972 Z: 0,637596

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 ±0,05 B-V-magnitude 0,19
U-magnitude 5,5 ±0,05 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 (J1950) RA: 18h 42min 43,325sec DEC: +39° 33' 33,99'' ±0,013 arcsec
position (J2000) RA: 18h 44min 22,896sec DEC: +39° 36' 46,52''
proper motion J1950 (FK4) RA: 0,0003 arcsec/a DEC: 0,064 arcsec/a ±0,002 arcsec/a in RA
±0,002 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 (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.