d Velorum

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

catalogues and names d Vel, HR 3485, HD 74956, SAO 236232, WDS 08447-5442A
constellation Vela

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

position, motion, parallax:

position (J2000) RA: 8h 44min 42,2sec DEC: -54 42' 30''
position (J1900) RA: 8h 41min 56,5sec DEC: -54 20' 31''
proper motion (J2000) RA: 0,023 arcsec/a DEC: -0,078 arcsec/a
radial velocity 2 km/s
note: suspected variable radial velocity
rotational velocity 40 km/s (uncertain) (variable)
trigonometric parallax 0,051 arcsec
note (category: radial and/or rotational velocities): Two determinations of vsini, 0 and 80k/s.
note (category: dynamical parallaxes): 0.034".


visual magnitude 1,96
(V on UBV Johnson system)

spectral / color information

spectral class A1V
B-V-magnitude 0,04
U-B-magnitude 0,07
R-I-magnitude 0,02

double/multiple star system information

number of components of multiple star system 4
separation 2,2 arcsec
mag difference (of double or brightest multiple) 3
component ID AB
note Worley (1978) update of the IDS
note (category: double and multiple data): AB binary with CPM double companion CD at 69". CD 11.0, 13.5v sep. 6".

miscellaneous information

note (category: group membership): In Ursa cluster? Sirius group?

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

position, motion, parallax:

position (J2000) RA: 8h 44min 42,163sec DEC: -54 42' 30,44'' 0,19 arcsec source: 16
proper motion (J2000) RA: 0,0022 arcsec/a DEC: -0,073 arcsec/a source: 25
radial velocity 2 km/s source: 25
trigonometric parallax 0,051 0,005 arcsec source: 25
galactic coord. (B1950) longitude: 272,08 latitude: -7,37
GCI unit vector (J2000) X: -0,380365 Y: 0,43486 Z: -0,816223


visual 1,96 (observed) source: 25
photovisual 2 source: 2
photographic 2 source: 2

spectral information:

spectral class A0 source: 96
Morgan-Keenan A1V source: 25
B-magnitude 2 0,05 B-V-magnitude 0,04
U-magnitude 2,07 0,05 U-B-magnitude 0,07

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 0,6 arcsec
position angle 64


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: 8h 43min 19,382sec DEC: -54 31' 28,26'' 0,016 arcsec
position (J2000) RA: 8h 44min 42,239sec DEC: -54 42' 29,86''
proper motion J1950 (FK4) RA: 0,0025 arcsec/a DEC: -0,079 arcsec/a 0,003 arcsec/a in RA
0,003 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0027 arcsec/a DEC: -0,078 arcsec/a
source of proper motion data Determined by source catalog


visual 2 (accuracy: 2 decimals)
source of visual magnitude data Combined magnitude of component stars.

spectral information:

spectral class A0
source of spectral data Taken from the HD with M stars reclassified by Miss Cannon.

remarks for duplicity and variability

Double star - see source catalog for source


source catalogue FK3, catalogue number: 330
Durchmusterung CP-54 1788
Boss General Catalogue 12069
Henry Draper Catalogue 74956