d Crucis

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. Combined General Catalogue of Variable Stars (Vol. I-III)

catalogues and names d Cru, del Cru, HR 4656, HD 106490, SAO 239791, FK5: 455
constellation Crux

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

position, motion, parallax:

position (J2000) RA: 12h 15min 8,7sec DEC: -58 44' 56''
position (J1900) RA: 12h 9min 49,9sec DEC: -58 11' 33''
proper motion (J2000) RA: -0,041 arcsec/a DEC: -0,009 arcsec/a
radial velocity 22 km/s
note: suspected variable radial velocity
rotational velocity 194 km/s (uncertain) (variable)
trigonometric parallax 0,003 arcsec


visual magnitude 2,8
(V on UBV Johnson system)

spectral / color information

spectral class B2IV
B-V-magnitude -0,23
U-B-magnitude -0,91
R-I-magnitude -0,24

variability information

variable star identification Del Cru
note (category: variability): Beta C 2.78 - 2.84V, 2.25 - 2.31p, 0.151038d. Expanding circumstellar shell.

miscellaneous information

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

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

position, motion, parallax:

position (J2000) RA: 12h 15min 8,683sec DEC: -58 44' 56,08'' 0,06 arcsec source: 15
proper motion (J2000) RA: -0,0053 arcsec/a DEC: -0,009 arcsec/a source: 25
radial velocity 22 km/s source: 25
trigonometric parallax 0,003 - source: 25
galactic coord. (B1950) longitude: 298,23 latitude: 3,79
GCI unit vector (J2000) X: -0,517657 Y: -0,034257 Z: -0,854902


visual 2,78 (observed) source: 30
photovisual 3,1 source: 2
photographic 2,9 source: 2

spectral information:

spectral class B3 source: 96
Morgan-Keenan B2IV source: 25
B-magnitude 2,57 0,05 B-V-magnitude -0,23
U-magnitude 1,66 0,05 U-B-magnitude -0,91

variability information:

source of data: 30
variability type 140
var. amplitude 0,06
var. period 0,15


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
25 Bright Star Catalogue, 5th edition
Hoffleit, D. and Warren, W.H. Jr., The Bright Star Catalogue, 5th Revised Edition, Version 2, 1994
30 GCVS, 4th edition
Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88
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: 12h 12min 28,6sec DEC: -58 28' 14,8'' 0,009 arcsec
position (J2000) RA: 12h 15min 8,675sec DEC: -58 44' 55,81''
proper motion J1950 (FK4) RA: -0,0049 arcsec/a DEC: -0,01 arcsec/a 0,002 arcsec/a in RA
0,002 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0053 arcsec/a DEC: -0,006 arcsec/a
source of proper motion data Determined by source catalog


visual 3,1 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class B3
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.


source catalogue FK4, catalogue number: 455
Durchmusterung CP-58 4189
Boss General Catalogue 16724
Henry Draper Catalogue 106490

data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)


position (J1950) RA: 12h 12min 28,6sec DEC: -58 28' 15''

variability informations:

variability type BCEP pulsating variable star
magnitute at max. brightness 2,78
magnitute at min. brightness 2,84
photometric system visual, photovisual or Johnson's V
period [d] 0,151038
rising time 40 % of period

spectral information

spectral class B2IV


to a study Vol. I GCVS (see Kholopov et al. 1985-1988)
to a chart/photograph no chart is avaible, but the star is contained in the 'Cape Photographic Durchmusterung'


ID in the GCVS catalogue 30/9004
constellation Crux
notes on existence The star is equivalent to '03090082tet 2'.

variability type description

variability type description
BCEP Variables of the Beta Cephei type (Beta Cep, Beta CMa), which are pulsating O8-B6 I-V stars with periods of light and radial-velocity variations in the range of 0.1 - 0.6 days and light amplitudes from 0.01 to 0.3 mag in V. The light curves are similar in shape to average radial-velocity curves but lag in phase by a quarter of the period, so that maximum brightness corresponds to
maximum contraction, i.e., to minimum stellar radius. The majority of these stars probably show radial pulsations, but some (V649 Per) display nonradial pulsations; multiperiodicity is characteristic of many of these stars.