HD 120987
HD 120987 (y Centauri or y Cen) is a star system located in the constellation Centaurus. HD 120987 is a quintuple star system located 50 pc (163 light years) from the Sun. The system has an apparent magnitude of 5.565. Based on the system's parallax, it is located some 172 light-years (52 parsecs) away.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Centaurus |
| Right ascension | 13h 53m 32.76039s |
| Declination | −35° 39′ 51.3200″ |
| Apparent magnitude (V) | 5.565 (6.27 / 6.38) |
| Characteristics | |
| Spectral type | F4V (F0V + F1V) |
| U−B color index | -0.03 |
| B−V color index | +0.44 |
| Astrometry | |
| Radial velocity (Rv) | -8.00 ± 7.40 km/s |
| Proper motion (μ) | RA: -83.39 mas/yr Dec.: -25.36 mas/yr |
| Parallax (π) | 19.13 ± 0.93 mas |
| Distance | 170 ± 8 ly (52 ± 3 pc) |
| Orbit | |
| Period (P) | 373.0 yr |
| Semi-major axis (a) | 1.519″ |
| Eccentricity (e) | 0.775 |
| Inclination (i) | 74.2° |
| Longitude of the node (Ω) | 112.3° |
| Periastron epoch (T) | B 1958.57 |
| Argument of periastron (ω) (secondary) | 90.7° |
| Details | |
| HD 120987 A | |
| Mass | 1.56 M☉ |
| HD 120987 B | |
| Mass | 1.53 M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 120987 appears to be a single F-type star with the spectral classification F4V, but closer inspection reveals it to be two similar F-type main-sequence stars with spectral classifications of F0V and F1V, respectively. The two orbit each other every 373 years, and are separated by 1.519 arcseconds while taking a very eccentric orbit.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.