y Velorum
catalogues and names
| catalogues and names | y Vel, HR 3786, HD 82434, SAO 221234, CD -39 5580, WDS 09307-4028 |
| constellation | Vela |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 9h 30min 42sec | DEC: -40° 28' 0'' | ||
| position (B1900) | RA: 9h 26min 45.6sec | DEC: -40° 1' 44'' | ||
| proper motion (J2000) | RA: -0.182 arcsec/a | DEC: 0.073 arcsec/a | ||
| radial velocity | 9 km/s note: variable radial velocity |
|||
| rotational velocity | 201 km/s | |||
| trigonometric parallax | 0.065 arcsec | |||
| galactic coordinates | longitude: 266.78° | latitude: 7.91° | ||
| note (category: dynamical parallaxes): | 0.061". |
magnitude
| visual magnitude | 3.6 (V on UBV Johnson system) |
spectral / color information
| spectral class | F3IV+F0IV |
| B-V-magnitude | 0.36 |
| U-B-magnitude | -0.03 |
| R-I-magnitude |
variability information
| variable star identification | 4513 |
| note (category: variability): | Comp. B, 4.5 - 5.1v. |
double/multiple star system information
| separation | 0.7 arcsec |
| mag difference (of double or brightest multiple) | 0.5 |
| note | Worley (1978) update of the IDS |
| note (category: double and multiple data): | 4.1 F2IV, 4.6 F0V, 33.99y, a = 0.795". Combined mag., colors. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 9h 30min 41.944sec | DEC: -40° 28' 0.41'' | ±0.19 arcsec | source: 16 |
| proper motion (J2000) | RA: -0.0169 arcsec/a | DEC: 0.064 arcsec/a | source: 25 | |
| radial velocity | 9 km/s | source: 25 | ||
| trigonometric parallax | 0.065 arcsec | ±0.006 arcsec | source: 25 | |
| galactic coord. (B1950) | longitude: 266.78° | latitude: 7.91° | ||
magnitude:
| visual | 3.6 (observed) | source: 25 |
| photovisual | 3.6 | source: 2 |
| photographic | 4.1 | source: 2 |
spectral information:
| spectral class | F5 | source: 96 | |
| Morgan-Keenan | F3IV+F0IV | source: 25 | |
| B-magnitude | 3.96 ±0.05 | B-V-magnitude | 0.36 |
| U-magnitude | 3.93 ±0.05 | U-B-magnitude | -0.03 |
variability information:
| variability type | 9 |
| var. amplitude | 0.6 |
double/multiple star system information:
| magnitude difference between brightest and second brightest component | 0.8 |
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 (B1950) | RA: 9h 28min 43.692sec | DEC: -40° 14' 49.29'' | ±0.024 arcsec |
| position (J2000) | RA: 9h 30min 42.014sec | DEC: -40° 28' 0.16'' | |
| proper motion B1950 (FK4) | RA: -0.0165 arcsec/a | DEC: 0.069 arcsec/a | ±0.004 arcsec/a in RA ±0.004 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0.016 arcsec/a | DEC: 0.073 arcsec/a | |
| source of proper motion data | Determined by source catalog | ||
magnitude:
| visual | 3.6 (accuracy: 2 decimals) |
| source of visual magnitude data | Combined magnitude of component stars. |
spectral information:
| spectral class | F5 |
| 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 |
catalogues
| source catalogue | FK3, catalogue number: 359 |
| Durchmusterung | CD-39 5580 |
| Boss General Catalogue | 13140 |
| Henry Draper Catalogue | 82434 |
data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)
position and proper motion:
| position (J2000) | RA: 9h 30.7min | DEC: -40° 28' |
| proper motion (J2000) | RA: -0.193 arcsec/a | DEC: 0.064 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 |
| - | 1897 | often | ° | '' | 4 | 4.8 | F0IV+F3IV | COP 1 |
discoverer information:
| discoverer code | discoverer | reference |
| COP 1 | - | - |
notes:
| note | Psi Velorum. P = 34yr., a = 0.80", motion direct. |
data from 4th Catalog of Orbits of Visual Binaries (Worley+, 1983)
position:
| position (B1900) | RA: 9h 26.8min | DEC: -40° 2' |
magnitudes, spectral classes, orbital elements:
| author: | O.J. Eggen |
| date of observation: | 1960 |
| magnitude of component A: | 4.1 |
| magnitude of component B: | 4.1 |
| spectral class component B: | F3IV |
| spectral class component B: | F3IV |
| period [y]: | 33.99 |
| semi-major axis [arcsec]: | 0.795 |
| inclination [deg]: | 58.5 |
| node [deg]: | 287.2 (ascending) |
| eccentricity: | 0.44 |
| time of periastron passage: | 1935.75 |
| grade: | good |
| reference: | Ann. Rev. Astron. Astrophys. 5, 109; 1967. |
| notes | Identification of ascending node not quite certain. |
| other name(s) | COP, Psi Vel |