Iota2 Muscae
B-type main sequence star in the constellation Musca
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ι2 Muscae, Latinised as Iota2 Muscae, is a blue-white-hued star in the southern constellation Musca, near the constellation's southern border with Chamaeleon. It has an apparent visual magnitude of 6.62,[2] which is just below the normal limit of stellar brightness visible to the naked eye. Based upon parallax measurements, it is located around 492 light-years (151 parsecs) from the Sun. It is a member of the Hyades Stream, but is not part of the Hyades or Praesepe open clusters.[9]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Musca |
| Right ascension | 13h 27m 18.49716s[1] |
| Declination | −74° 41′ 30.3203″[1] |
| Apparent magnitude (V) | 6.62[2] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | B9V[4] |
| B−V color index | −0.056±0.004[2] |
| Astrometry | |
| Radial velocity (Rv) | −3.0±7.4[5] km/s |
| Proper motion (μ) | RA: −35.337[1] mas/yr Dec.: −13.814[1] mas/yr |
| Parallax (π) | 6.6274±0.0366 mas[1] |
| Distance | 492 ± 3 ly (150.9 ± 0.8 pc) |
| Absolute magnitude (MV) | 0.61[2] |
| Details | |
| Mass | 2.8[6] M☉ |
| Radius | 2.5[6] R☉ |
| Luminosity | 71[6] L☉ |
| Surface gravity (log g) | 4.09[6] cgs |
| Temperature | 10,641[6] K |
| Metallicity [Fe/H] | −0.19[7] dex |
| Rotational velocity (v sin i) | 116[3] km/s |
| Other designations | |
| ι2 Mus, CD−74°793, HD 116579, HIP 65628, HR 5051, SAO 257047[8] | |
| Database references | |
| SIMBAD | data |
This is a B-type main-sequence star with a stellar classification of B9V. It has a high rate of spin, showing a projected rotational velocity of 116 km/s. The star has 2.8 times the mass of the Sun and is radiating 71 times the Sun's luminosity from its photosphere at an effective temperature of about 10,641 K.