i1Librae

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 i1Lib, NSV 06981, 24 Lib, HR 5652, HD 134759, SAO 159090, FK5: 559, WDS 15122-1948A
constellation Libra

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


position, motion, parallax:

position (J2000) RA: 15h 12min 13,3sec DEC: -19° 47' 30''
position (J1900) RA: 15h 6min 31,1sec DEC: -19° 24' 48''
proper motion (J2000) RA: -0,036 arcsec/a DEC: -0,039 arcsec/a
radial velocity -12 km/s
note: spectroscopic binaries, double lined spectra
note: orbital data avaible
rotational velocity 54 km/s (uncertain) (variable)
trigonometric parallax 0,03 arcsec

magnitude

visual magnitude 4,54
(V on UBV Johnson system)

spectral / color information

spectral class A0pSi
B-V-magnitude -0,08
U-B-magnitude -0,35
R-I-magnitude -0,09
note (category: spectra): Also classified B8VpSi, B9IV-V; component B G5IV.

variability information

variable star identification 6981
note (category: variability): ADS 9532A, Alpha CV?, 4.53 - 4.56V. Spectrum variable.

double/multiple star system information

number of components of multiple star system 4
separation 0,1 arcsec
mag difference (of double or brightest multiple) 0,6
component ID AP
note (category: double and multiple data): AP 5.1 B9IV, 5.6 B9V, 23.42y, a = 0.116", combined light, colors. Mean mass 5 solar. BC, 10.5, 11.2v sep. 1.9". A physical pair in orbital motion about AP at 58"; possibly quintuple system.
note (category: spectroscopic binaries): ADS 9532A, 22.35y D, K 3.4k/s, V0 -14.2k/s, asini 358.

miscellaneous information

note (category: group membership): Member of Pleiades group.

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

position, motion, parallax:

position (J2000) RA: 15h 12min 13,289sec DEC: -19° 47' 30,26'' ±0,06 arcsec source: 15
proper motion (J2000) RA: -0,0025 arcsec/a DEC: -0,039 arcsec/a source: 25
radial velocity -12 km/s source: 25
trigonometric parallax 0,03 ±0,003 arcsec source: 25
galactic coord. (B1950) longitude: 342,69° latitude: 32°
GCI unit vector (J2000) X: -0,628929 Y: -0,699855 Z: -0,338602

magnitude:

visual 4,54 (observed) source: 25
photovisual 4,7 source: 2
photographic 4,7 source: 2

spectral information:

spectral class A0 source: 96
Morgan-Keenan A0pSi source: 25
B-magnitude 4,46 ±0,05 B-V-magnitude -0,08
U-magnitude 4,11 ±0,05 U-B-magnitude -0,35

variability information:

source of data: 28
variability type 160
var. amplitude 0,03

double/multiple star system information:

source of data: 19
magnitude difference between brightest and second brightest component 0,4

component magnitude spectral class catalogue(s)/name(s)
A 4,54 A0 i1Librae, 24 Lib, HR 5652, HD 134759, SAO 159090
B 9,68 G5

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
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: 15h 9min 21,946sec DEC: -19° 36' 13,7'' ±0,004 arcsec
position (J2000) RA: 15h 12min 13,284sec DEC: -19° 47' 30,28''
proper motion J1950 (FK4) RA: -0,0027 arcsec/a DEC: -0,043 arcsec/a ±0,001 arcsec/a in RA
±0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0026 arcsec/a DEC: -0,039 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 4,7 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class A0p
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue FK4, catalogue number: 559
Durchmusterung BD-19 4047
Boss General Catalogue 20433
Henry Draper Catalogue 134759

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

position and proper motion:

position (J2000) RA: 15h 12,2min DEC: -19° 48'
proper motion (J2000) RA: -0,036 arcsec/a DEC: -0,039 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
Aa 1940 40 ° '' 5,1 5,5 B9IV B 2351
Aa-B 1782 15 111° 57,8'' 4,53 9,82 - H 44
BC 1878 16 20° 1,9'' 10,4 10,9 G5IV BU 618
1966 15° -

discoverer information:

discoverer code discoverer reference
B 2351 Bos, W.H. van den -
H 44 Herschel, W. -
BU 618 Burnham, S.W. -

notes:

note Iota (1) Lib. P = 23.4yr., a = 0.12", motion retro- grade. There is evidence for a spectroscopic subsystem, and BC is physical, so the system is probably quin- tuple. Alternate spectrum of Aa: ApSi. Aa-B: H VI 44.

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

position:

position (J1900) RA: 15h 6,5min DEC: -19° 25'

magnitudes, spectral classes, orbital elements:

author: W.D. Heintz
date of observation: 1978
magnitude of component A: 5,1
magnitude of component B: 5,1
spectral class component B: A0p
spectral class component B: A0p
period [y]: 23,42
semi-major axis [arcsec]: 0,116
inclination [deg]: 162
node [deg]: 34,6 (ascending)
equinox of node: 2000
eccentricity: 0,3
time of periastron passage: 1972,93
dates of ephemeris: 1980-1998
grade: reliable
reference: Astron. Astrophys. Suppl. 47, 569; 1982.
notes Double-lined spectrum, frequently blended. The second spectrum may belong, not to the visual companion, but to a third star, since the RV variation - if real - is faster and larger than the visual orbit with its low inclination could cause. The pair BC = BU 618 (mag. 9.82, 1.9") is 58" from the bright pair and physical, so that the system is probably quintuple. 15108-0432 One component is probably variable; position angles have been reversed repeatedly.