Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Monoceros |
Right ascension | 07h 10m 13.68177s [1] |
Declination | −04° 14′ 13.5829″ [1] |
Apparent magnitude (V) | 4.92 [2] |
Characteristics | |
Evolutionary stage | horizontal branch [3] |
Spectral type | K0III [4] |
U−B color index | +0.78 [2] |
B−V color index | +1.03 [2] |
Astrometry | |
Radial velocity (Rv) | +77.74 [5] km/s |
Proper motion (μ) |
RA: −0.714
[1]
mas/
yr Dec.: +217.298 [1] mas/ yr |
Parallax (π) | 16.8419 ± 0.1692 mas [1] |
Distance | 194 ± 2
ly (59.4 ± 0.6 pc) |
Absolute magnitude (MV) | 0.94 [6] |
Details [7] | |
Mass | 1.07±0.20 M☉ |
Radius | 10.25±0.11 [1] R☉ |
Luminosity | 46.36±0.56 [1] L☉ |
Surface gravity (log g) | 2.53±0.10 cgs |
Temperature | 4,714±46 K |
Metallicity [Fe/H] | −0.25±0.03 dex |
Rotational velocity (v sin i) | 2.33±0.50 km/s |
Age | 5.75±2.85 Gyr |
Other designations | |
Database references | |
SIMBAD | data |
20 Monocerotis is a single [9] star located about 194 [1] light years away from the Sun in the equatorial constellation of Monoceros. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.92. [2] The star is receding from the Earth with a heliocentric radial velocity of +78 km/s. [5]
This object is an aging giant star with a stellar classification of K0 III. [4] It is a red clump giant, [3] which indicates it is on the horizontal branch and is generating energy through helium fusion at its core. The star is around six [7] billion years old with 1.1 times the mass of the Sun. After exhausting the supply of hydrogen at its core, it has expanded to 10.3 [1] times the Sun's radius. It is radiating 46 [1] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,714 K. [7]
In addition to the primary, three visual companions have been reported: component B, with magnitude 12.93 and separation 67.8", C, with magnitude 10.16 and separation 167.9", and D, with magnitude 12.46 and separation 102.3". [10]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Monoceros |
Right ascension | 07h 10m 13.68177s [1] |
Declination | −04° 14′ 13.5829″ [1] |
Apparent magnitude (V) | 4.92 [2] |
Characteristics | |
Evolutionary stage | horizontal branch [3] |
Spectral type | K0III [4] |
U−B color index | +0.78 [2] |
B−V color index | +1.03 [2] |
Astrometry | |
Radial velocity (Rv) | +77.74 [5] km/s |
Proper motion (μ) |
RA: −0.714
[1]
mas/
yr Dec.: +217.298 [1] mas/ yr |
Parallax (π) | 16.8419 ± 0.1692 mas [1] |
Distance | 194 ± 2
ly (59.4 ± 0.6 pc) |
Absolute magnitude (MV) | 0.94 [6] |
Details [7] | |
Mass | 1.07±0.20 M☉ |
Radius | 10.25±0.11 [1] R☉ |
Luminosity | 46.36±0.56 [1] L☉ |
Surface gravity (log g) | 2.53±0.10 cgs |
Temperature | 4,714±46 K |
Metallicity [Fe/H] | −0.25±0.03 dex |
Rotational velocity (v sin i) | 2.33±0.50 km/s |
Age | 5.75±2.85 Gyr |
Other designations | |
Database references | |
SIMBAD | data |
20 Monocerotis is a single [9] star located about 194 [1] light years away from the Sun in the equatorial constellation of Monoceros. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.92. [2] The star is receding from the Earth with a heliocentric radial velocity of +78 km/s. [5]
This object is an aging giant star with a stellar classification of K0 III. [4] It is a red clump giant, [3] which indicates it is on the horizontal branch and is generating energy through helium fusion at its core. The star is around six [7] billion years old with 1.1 times the mass of the Sun. After exhausting the supply of hydrogen at its core, it has expanded to 10.3 [1] times the Sun's radius. It is radiating 46 [1] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,714 K. [7]
In addition to the primary, three visual companions have been reported: component B, with magnitude 12.93 and separation 67.8", C, with magnitude 10.16 and separation 167.9", and D, with magnitude 12.46 and separation 102.3". [10]