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Star in the constellation Monoceros From Wikipedia, the free encyclopedia
13 Monocerotis (13 Mon) is a class A0 Ib (white supergiant) star in the constellation Monoceros. Its apparent magnitude is 4.5 and it is approximately 780 parsecs (2,500 ly) away.
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Monoceros |
Right ascension | 06h 32m 54.22948s[1] |
Declination | 07° 19′ 58.6942″[1] |
Apparent magnitude (V) | 4.498[2] |
Characteristics | |
Spectral type | A0 Ib[2] |
U−B color index | −0.217[2] |
B−V color index | +0.007[2] |
Variable type | suspected[3] |
Astrometry | |
Radial velocity (Rv) | +11.80[4] km/s |
Proper motion (μ) | RA: -0.20[1] mas/yr Dec.: -3.48[1] mas/yr |
Parallax (π) | 0.83 ± 0.46 mas[1] |
Distance | 780[5] pc |
Absolute magnitude (MV) | −4.80[6] |
Details | |
Mass | 12.0[7] M☉ |
Radius | 34[6] R☉ |
Surface gravity (log g) | 2.15[2] cgs |
Temperature | 10,000[2] K |
Metallicity [Fe/H] | −0.18[8] dex |
Rotational velocity (v sin i) | 0[2] km/s |
Age | 16[7] Myr |
Other designations | |
Database references | |
SIMBAD | data |
13 Mon lies within the Monoceros OB1 stellar association,[6] halfway between the Rosette Nebula and NGC 2264, at a distance of about 780 parsecs.[5] It is surrounded by a small reflection nebula listed as Van den Bergh 81 (VdB 81).[9]
13 Monocerotis has been used as a standard star for the A0 Ib spectral class.[10]
Extended photometry of 13 Monocerotis from 1997 to 2000 shows irregular variation of up to 0.04 magnitudes and also a slight trend to become fainter over the period.[11] All the bright A0 - A5 supergiants analysed using Hipparcos satellite data were found to be variable, but 13 Mon was the least variable.[12]
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