n Centauri
catalogues and names
| catalogues and names | n Cen, nu Cen, HR 5190, HD 120307, SAO 224469, CD -41 8171 |
| constellation | Centaurus |
data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)
position, motion, parallax:
| position (J2000) | RA: 13h 49min 30.3sec | DEC: -41° 41' 16'' | ||
| position (B1900) | RA: 13h 43min 30.2sec | DEC: -41° 11' 22'' | ||
| proper motion (J2000) | RA: -0.022 arcsec/a | DEC: -0.021 arcsec/a | ||
| radial velocity | 9 km/s note: spectroscopic binaries, single lined spectra note: orbital data avaible |
|||
| rotational velocity | 91 km/s (uncertain) (variable) | |||
| galactic coordinates | longitude: 314.41° | latitude: 19.89° | ||
magnitude
| visual magnitude | 3.41 (V on UBV Johnson system) |
spectral / color information
| spectral class | B2IV |
| B-V-magnitude | -0.22 |
| U-B-magnitude | -0.84 |
| R-I-magnitude |
variability information
| variable star identification | Nu Cen |
| note (category: variability): | Beta C?, 3.40 - 3.43V, 3.48 - 3.52R, 0.175d. |
double/multiple star system information
| note (category: spectroscopic binaries): | 2.6252d, K 20.6k/s, V0 +9.1k/s, asini 0.744. |
miscellaneous information
| note (category: group membership): | Sco-Cen cluster; upper Cen group of Sco-Cen assoc.; member of Pleiades group. |
data from SKY2000 - Master Star Catalog (Myers+ 1997)
position, motion, parallax:
| position (J2000) | RA: 13h 49min 30.264sec | DEC: -41° 41' 16.55'' | ±0.19 arcsec | source: 16 |
| proper motion (J2000) | RA: -0.0022 arcsec/a | DEC: -0.044 arcsec/a | source: 25 | |
| radial velocity | 9 km/s | source: 25 | ||
| galactic coord. (B1950) | longitude: 314.42° | latitude: 19.89° | ||
magnitude:
| visual | 3.41 (observed) | source: 25 |
| photovisual | 3.5 | source: 2 |
| photographic | 3.3 | source: 2 |
spectral information:
| spectral class | B2 | source: 96 | |
| Morgan-Keenan | B2IV | source: 25 | |
| B-magnitude | 3.19 ±0.05 | B-V-magnitude | -0.22 |
| U-magnitude | 2.35 ±0.05 | U-B-magnitude | -0.84 |
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 | |
| 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: 13h 46min 29.738sec | DEC: -41° 26' 21.6'' | ±0.023 arcsec |
| position (J2000) | RA: 13h 49min 30.313sec | DEC: -41° 41' 15.82'' | |
| proper motion B1950 (FK4) | RA: -0.0021 arcsec/a | DEC: -0.025 arcsec/a | ±0.005 arcsec/a in RA ±0.004 arcsec/a in DEC |
| proper motion J2000 (FK5) | RA: -0.0019 arcsec/a | DEC: -0.021 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 | B2 |
| source of spectral data | Taken from the Henry Draper Catalogue or no spectrum in source catalog. |
catalogues
| source catalogue | GC, catalogue number: 18665 |
| Durchmusterung | CD-41 8171 |
| Boss General Catalogue | 18665 |
| Henry Draper Catalogue | 120307 |
data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)
position:
| position (equinox 1950.0) | RA: 13h 46min 29.7sec | DEC: -41° 26' 22'' |
variability informations:
| variability type | ELL:+BCEP | rotating variable star pulsating variable star |
| magnitute at max. brightness | 3.38 | |
| magnitute at min. brightness | 3.41 | |
| photometric system | visual, photovisual or Johnson's V |
references
| to a study | C.Waelkens, F.Rufener, AsAp 121,45,1983. |
| to a chart/photograph | no chart is avaible, but the star is contained in the 'Cordoba Durchmusterung' |
miscanellous
| ID in the GCVS catalogue | 19/9013 |
| constellation | Centaurus |
| notes on existence | The star is equivalent to '67317'. |
variability type description
| variability type | description |
| ELL | Rotating ellipsoidal variables (b Per, Alpha Vir). These are close binary systems with ellipsoidal components, which change combined brightnesses with periods equal to those of orbital motion because of changes in emitting areas toward an observer, but showing no eclipses. Light amplitudes do not exceed 0.1 mag in V. |
| 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. |