Mu1 Octantis
Star in the constellation of Octans
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Mu1 Octantis, Latinized from μ1 Octantis, is a solitary star in the southern circumpolar constellation Octans. It has an apparent magnitude of 5.98,[2] allowing it to be faintly visible to the naked eye under ideal conditions. Located 335 light years away,[1] it is approaching the Sun with a heliocentric radial velocity of −36 km/s.[5]
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Octans |
| Right ascension | 20h 42m 02.9873s[1] |
| Declination | −76° 10′ 50.131″[1] |
| Apparent magnitude (V) | 5.98 ± 0.01[2] |
| Characteristics | |
| Spectral type | F6 II/III[3] |
| U−B color index | +0.11[4] |
| B−V color index | +0.44[4] |
| Astrometry | |
| Radial velocity (Rv) | −36 ± 4[5] km/s |
| Proper motion (μ) | RA: +190.891[1] mas/yr Dec.: −9.479[1] mas/yr |
| Parallax (π) | 9.7399±0.0241 mas[1] |
| Distance | 334.9 ± 0.8 ly (102.7 ± 0.3 pc) |
| Absolute magnitude (MV) | +0.97[6] |
| Details | |
| Mass | 1.36+0.26 −0.19[7] M☉ |
| Radius | 4.68+0.15 −0.32[7] R☉ |
| Luminosity | 34.3[8] L☉ |
| Surface gravity (log g) | 3.23+0.11 −0.07[7] cgs |
| Temperature | 6,521[8] K |
| Metallicity [Fe/H] | +0.19[9] dex |
| Age | 900[9] Myr |
| Other designations | |
| μ1 Oct, 50 G. Octantis, CD−76°1054, CPD−76°1434, GC 28731, HD 196051, HIP 102162, HR 7863, SAO 257838, LTT 8161 | |
| Database references | |
| SIMBAD | data |
This object is an F-type star with the blended luminosity class of a giant star and a bright giant.[3] At present it has 1.36 times the mass of the Sun[7] but has expanded to 4.68 times its girth.[7] It radiates at 34.3 L☉ from its enlarged photosphere at an effective temperature of 6,521 K,[8] giving it a yellow white glow. Mu1 Octantis is metal enriched and has an age of 900 million years.[9]