Alpha Unicorn (α Mon, α Monocerotis) is a star in the equatorial constellation of the Unicorn .
| Alpha Unicorn | |||
|---|---|---|---|
| Star | |||
 Location of α Mon in the constellation | |||
| Observational data ( Age J2000.0 ) | |||
| Right ascension | |||
| Declination | |||
| Distance | 144 St. years (44.2 pc ) | ||
| Visible magnitude ( V ) | 3.94 [1] | ||
| Constellation | Unicorn | ||
| Astrometry | |||
| Radial velocity ( R v ) | 11.66 ± 0.26 km / s | ||
| Own movement (μ) | RA: -74.61 ± 0.14 0 mas per year Dec: -19.59 ± 0.1 mas per year | ||
| Parallax (π) | 22.07 ± 0.18 mas | ||
| Absolute magnitude (V) | 0.71 ± 0.08 [2] | ||
| Specifications | |||
| Spectral class | G9III | ||
| Color Index ( B - V ) | 1.022 [1] | ||
| physical characteristics | |||
| Weight | 2.02 ± 0.29 [2] M ☉ | ||
| Radius | 10.1 ± 0.5 [2] R ☉ | ||
| Age | 1.18 ± 0.42 [2] years | ||
| Temperature | 4,879 [2] K | ||
| Metallicity | −0.01 [2] | ||
| Rotation | 1.9 [3] km / s (326 days [3] ) | ||
| |||
| Database Information | |||
| SIMBAD | data | ||
Alpha Unicorn is the brightest star in the constellation Unicorn and is at the end of its life cycle. Internal changes cause "bloating" of gas in the star.
The star belongs to the class of yellow giants and has a visible magnitude of 3.93 (visible to the naked eye). It is located 144 light years from Earth.
Notes
- ↑ 1 2 Hekker, S .; Reffert, S .; Quirrenbach, A. & Mitchell, DS (2006), " Precise radial velocities of giant stars. I. Stable stars ", Astronomy and Astrophysics T. 454 (3): 943–949 , DOI 10.1051 / 0004-6361: 20064946
- ↑ 1 2 3 4 5 6 da Silva, L .; Girardi, L .; Pasquini, L. & Setiawan, J. (2006), " Basic physical parameters of a selected sample of evolved stars ", Astronomy and Astrophysics T. 458 (2): 609–623 , DOI 10.1051 / 0004-6361: 20065105
- ↑ 1 2 Setiawan, J .; Pasquini, L .; da Silva, L. & Hatzes, AP (2004), " Precise radial velocity measurements of G and K giants. Multiple systems and variability trend along the Red Giant Branch ", Astronomy and Astrophysics T. 421: 241–254 , DOI 10.1051 / 0004-6361: 20041042-1