g Lupi


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


catalogues and names g Lup, gam Lup, HR 5776, HD 138690, SAO 225938, WDS 15351-4110
constellation Lupus

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


position, motion, parallax:

position (J2000) RA: 15h 35min 8,5sec DEC: -41 10' 1''
position (J1900) RA: 15h 28min 28,5sec DEC: -40 49' 50''
proper motion (J2000) RA: -0,015 arcsec/a DEC: -0,028 arcsec/a
radial velocity 2 km/s
note: variable radial velocity
rotational velocity 266 km/s (uncertain) (variable)
dynamical parallax 0,008 arcsec
note (category: radial and/or rotational velocities): Expanding circumstellar shell.

magnitude

visual magnitude 2,78
(V on UBV Johnson system)

spectral / color information

spectral class B2IV
B-V-magnitude -0,2
U-B-magnitude -0,82
R-I-magnitude -0,24
note (category: spectra): Spectra obtained in March 1987 at Vainu Bappu Obs. showed H alpha profiles with emission peaks. The star may be in transition from B to Be type.

double/multiple star system information

separation 0,6 arcsec
mag difference (of double or brightest multiple) 0,1
note Worley (1978) update of the IDS
note (category: double and multiple data): 3.5 B2IV-V, 3.6 B2IV-V, 147y, a = 0.59". Combined mag., colors.

miscellaneous information

note (category: group membership): Probable member of Sco-Cen cluster; upper Cen group of Sco-Cen assoc.

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

position, motion, parallax:

position (J2000) RA: 15h 35min 8,371sec DEC: -41 10' 0,97'' 0,19 arcsec source: 16
proper motion (J2000) RA: -0,0031 arcsec/a DEC: -0,045 arcsec/a source: 25
radial velocity 2 km/s source: 25
galactic coord. (B1950) longitude: 333,2 latitude: 11,89
GCI unit vector (J2000) X: -0,444765 Y: -0,607358 Z: -0,658255

magnitude:

visual 2,78 (observed) source: 25
photovisual 3 source: 2
photographic 2,8 source: 2

spectral information:

spectral class B3 source: 96
Morgan-Keenan B2IV source: 25
B-magnitude 2,58 0,05 B-V-magnitude -0,2
U-magnitude 1,76 0,05 U-B-magnitude -0,82

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 0,7 arcsec
magnitude difference between brightest and second brightest component 0,1
position angle 278

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
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 31min 47,99sec DEC: -41 0' 0,97'' 0,014 arcsec
position (J2000) RA: 15h 35min 8,456sec DEC: -41 10' 0,53''
proper motion J1950 (FK4) RA: -0,0014 arcsec/a DEC: -0,031 arcsec/a 0,003 arcsec/a in RA
0,003 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0013 arcsec/a DEC: -0,028 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 3 (accuracy: 2 decimals)
source of visual magnitude data Taken from Harvard or San Luis photometry.

spectral information:

spectral class B3
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: 20926
Durchmusterung CD-40 9760
Boss General Catalogue 20926
Henry Draper Catalogue 138690

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

position and proper motion:

position (J2000) RA: 15h 35,1min DEC: -41 10'
proper motion (J2000) RA: -0,017 arcsec/a DEC: -0,027 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
- 1835 64 274 0,8'' 3,5 3,6 B2IV HJ 4786
1991 278 0,7''

discoverer information:

discoverer code discoverer reference
HJ 4786 Herschel, J. -

notes:

note Gamma Lup. P = 190yr., a = 0.66", motion retrograde in a highly-inclined orbit.