| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 08h25m 39.63201s[1] |
| Declination | −03° 54′ 23.1178″[1] |
| Apparent magnitude (V) | 3.90[2] |
| Characteristics | |
| Spectral type | A0 Va[3] |
| B−V color index | −0.012±0.003[4] |
| Astrometry | |
| Radial velocity (Rv) | +10.00±1.78[5] km/s |
| Proper motion (μ) | RA: −66.43[1] mas/yr Dec.: −23.41[1] mas/yr |
| Parallax (π) | 26.66 ± 0.19 mas[1] |
| Distance | 122.3 ± 0.9 ly (37.5 ± 0.3 pc) |
| Absolute magnitude (MV) | 1.04[4] |
| Details | |
| Mass | 2.36[6] M☉ |
| Radius | 2.7[7] R☉ |
| Luminosity | 40.05[4] L☉ |
| Surface gravity (log g) | 4.20[6] cgs |
| Temperature | 10,281±350[6] K |
| Rotational velocity (v sin i) | 129[6] km/s |
| Age | 162[6] Myr |
| Other designations | |
C Hya, 30 Mon, BD−03°2339, HD 71155, HIP 41307, HR 3314, SAO 135896[8] | |
| Database references | |
| SIMBAD | data |
30 Monocerotis is a single[9] star in the equatorial constellationofHydra,[8] located 122 light years away from the Sun.[1] It has the Bayer designation C Hydrae;[8] 30 Monocerotis is the Flamsteed designation and was assigned when it belonged to the constellation Monoceros. The object is visible to the naked eye as a white-hued star with an apparent visual magnitude of 3.90.[2] It is moving away from the Earth with a heliocentric radial velocity of +10 km/s.[5]
This is an A-type main-sequence star with a stellar classification of A0 Va.[3] It is around 162[6] million years old with a high rate of spin, showing a projected rotational velocity of 129 km/s.[6] The star has 2.36[6] times the mass of the Sun and about 2.7[7] times the Sun's radius. It is radiating 40[4] times the luminosity of the Sun from its photosphere at an effective temperature of 10,281 K.[6]
Astatistically significant infrared excess has been detected, indicating a debris disk is orbiting 2.0±0.1 AU from the host star with a blackbody temperatureof499±3 K. It is comparable in size to the asteroid belt.[10] An unexplained X-ray emission has also been detected coming from these coordinates – stars of this class are not normally expected to show X-ray emission, so it may be coming from a background source or an unseen companion.[11]
|
| |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| |||||||||||||||
| Stars |
| ||||||||||||||
| Star clusters |
| ||||||||||||||
| Nebulae |
| ||||||||||||||
| Galaxies |
| ||||||||||||||
| Galaxy clusters |
| ||||||||||||||
| Astronomical events |
| ||||||||||||||
