Alpha Monocerotis
Template:Location mark Location of α Monocerotis (circled) | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Monoceros |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 3.94[2] |
| Characteristics | |
| Evolutionary stage | red clump[3] |
| Spectral type | G9.5 III-IIIb Fe-0.5[4] |
| B−V Template:Engvar | 1.022[2] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[5] km/s |
| Proper motion (μ) | RA: −74.989 mas/yr[1] Dec.: −19.838 mas/yr[1] |
| Parallax (π) | 22.3839±0.1348 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc)[1] |
| Absolute magnitude (MV) | Script error: No such module "val".[6] |
| Details | |
| Mass | Script error: No such module "val".[5] Template:Solar mass |
| Radius | Script error: No such module "val".[7] Template:Solar radius |
| Luminosity | Script error: No such module "val".[7] Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val".[5] cgs |
| Temperature | Script error: No such module "val".[7] K |
| Metallicity [Fe/H] | Script error: No such module "val".[5] dex |
| Rotation | 326 days[8] |
| Rotational velocity (v sin i) | Script error: No such module "val".[5] km/s |
| Age | Script error: No such module "val".[5] Myr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[9] | |
| Database references | |
| SIMBAD | data |
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Alpha Monocerotis, Latinised from α Monocerotis, is the Bayer designation for the brightest star in the equatorial constellation of Monoceros. It can be viewed with the naked eye, having an apparent visual magnitude of 3.94.[2] Based upon an annual parallax shift of Script error: No such module "val". as seen from Earth,[1] it is located 146 light-years away from the Sun. The star is moving away from the Sun with a radial velocity of +11.7 km/s.[5]
The stellar classification of G9.5 III-IIIb Fe-0.5[4] indicates this is an evolved giant star of type G, which means the hydrogen has been depleted at its core and the outer envelope has expanded and cooled. The 'Fe−0.5' notation indicates the spectrum displays a slight underabundance of iron relative to other stars of this temperature. It is a red clump giant, which means it is generating energy through helium fusion at its core.[3] At the age of 890 million years, this yellow-hued star has an estimated 2.2 times the mass of the Sun[5] and 10 times the Sun's radius.[7] It is spinning sedately with a rotation period of about 326 days.[8]
References
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- ↑ a b c d e f Template:Cite Gaia DR3
- ↑ a b c Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ a b c d e f g h Script error: No such module "citation/CS1". Alpha Monocerotis' database entry at VizieR.
- ↑ Script error: No such module "citation/CS1".
- ↑ a b c d Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ Template:Cite simbad
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External links
- Script error: No such module "citation/CS1".