g Arae


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 Ara, HR 6462, HD 157246, SAO 244726, WDS 17254-5623A
constellation Ara

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


position, motion, parallax:

position (J2000) RA: 17h 25min 23,6sec DEC: -56 22' 39''
position (J1900) RA: 17h 16min 58,5sec DEC: -56 17' 0''
proper motion (J2000) RA: -0,002 arcsec/a DEC: -0,012 arcsec/a
radial velocity -3 km/s
note: variable radial velocity
rotational velocity 281 km/s (uncertain) (variable)

magnitude

visual magnitude 3,34
(V on UBV Johnson system)

spectral / color information

spectral class B1Ib
B-V-magnitude -0,13
U-B-magnitude -0,96
note (category: spectra): Unusually large line broadening for luminosity Ib. Also classified B1III.
note (category: colors): Color excess E(B-V) = +0.08.

double/multiple star system information

number of components of multiple star system 3
separation 17,9 arcsec
mag difference (of double or brightest multiple) 7
component ID AB
note Worley (1978) update of the IDS
note (category: double and multiple data): Component B, A7V; C is optical.

miscellaneous information

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

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

position, motion, parallax:

position (J2000) RA: 17h 25min 23,742sec DEC: -56 22' 39,89'' 0,19 arcsec source: 16
proper motion (J2000) RA: 0,0022 arcsec/a DEC: -0,016 arcsec/a source: 25
radial velocity -3 km/s source: 25
galactic coord. (B1950) longitude: 334,65 latitude: -11,48
GCI unit vector (J2000) X: -0,083288 Y: -0,547415 Z: -0,832706

magnitude:

visual 3,34 (observed) source: 25
photovisual 3,5 source: 2
photographic 3,3 source: 2

spectral information:

spectral class B1 source: 96
Morgan-Keenan B1Ib source: 25
B-magnitude 3,21 0,05 B-V-magnitude -0,13
U-magnitude 2,25 0,05 U-B-magnitude -0,96

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 17,9 arcsec
magnitude difference between brightest and second brightest component 6,89
position angle 328

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: 17h 21min 10,732sec DEC: -56 19' 58,85'' 0,022 arcsec
position (J2000) RA: 17h 25min 23,625sec DEC: -56 22' 39,41''
proper motion J1950 (FK4) RA: 0,0003 arcsec/a DEC: -0,011 arcsec/a 0,004 arcsec/a in RA
0,003 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0003 arcsec/a DEC: -0,012 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 3,5 (accuracy: 2 decimals)
source of visual magnitude data Taken from Harvard or San Luis photometry.

spectral information:

spectral class B1
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: 23517
Durchmusterung CP-56 8225
Boss General Catalogue 23517
Henry Draper Catalogue 157246

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

position and proper motion:

position (J2000) RA: 17h 25,4min DEC: -56 23'
proper motion (J2000) RA: -0,01 arcsec/a DEC: -0,025 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 1872 7 328 17,9'' 3,32 10,21 B1Ib HJ 4942
AC 1913 1 66 41,6'' 3,32 12,16 - HJ 4942

discoverer information:

discoverer code discoverer reference
HJ 4942 Herschel, J. -

notes:

note Gamma Ara.