HD 104555
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| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Octans |
| Right ascension | 12h 02m 20.23931s[1] |
| Declination | −85° 37′ 54.3264″[1] |
| Apparent magnitude (V) | 6.02±0.01[2] |
| Characteristics | |
| Evolutionary stage | horizontal branch[3] |
| Spectral type | K3 III[4] |
| U−B color index | +1.54[5] |
| B−V color index | +1.29[5] |
| Astrometry | |
| Radial velocity (Rv) | 17.1±0.4[6] km/s |
| Proper motion (μ) | RA: −57.259 mas/yr[1] Dec.: +1.452 mas/yr[1] |
| Parallax (π) | 9.7144±0.0241 mas[1] |
| Distance | 335.7 ± 0.8 ly (102.9 ± 0.3 pc) |
| Absolute magnitude (MV) | +0.78[7] |
| Details | |
| Mass | 2.18+0.02 −0.01[8] M☉ |
| Radius | 9.82+1.95 −0.92[8] R☉ |
| Luminosity | 59.8[9] L☉ |
| Temperature | 4,497±122[10] K |
| Metallicity [Fe/H] | −0.06+0.11 −0.08[8] dex |
| Rotational velocity (v sin i) | <1[11] km/s |
| Age | 955+68 −42[8] Myr |
| Other designations | |
| 12 G. Octantis[12], CPD−84°371, FK5 3983, GC 16449, HD 104555, HIP 58697, HR 4595, SAO 258632, WDS J12023-8538A[13] | |
| Database references | |
| SIMBAD | data |
HD 104555, also known as HR 4595, is a star located in the southern circumpolar constellation Octans. It has an apparent magnitude of 6.02,[2] allowing it to be faintly visible to the naked eye. Based on parallax measurements from Gaia Data Release 3, it is estimated to be 336 light years distant.[1] It appears to be receding from the Solar System, having a heliocentric radial velocity of 17.1 km/s.[6]
This is an evolved, orange hued giant star with a stellar classification of K3 III.[4] It is currently on the horizontal branch,[3] generating energy via helium fusion at its core. It has twice the mass of the Sun but at 955 million years old, it has expanded to 9.82 times its girth.[8] It radiates 60 times the luminosity of the Sun[9] from its photosphere at an effective temperature of 4,497 K.[10] HD 10455 has an iron abundance 12% below solar levels, making it slightly metal deficient.[8] Like most giants, it spins slowly, having a projected rotational velocity lower than 1 km/s.[11]
HIP 58713 is an 8th magnitude co-moving star located 24.8″ away along a position angle of 146°.[14] It is a main sequence star with a spectral class of F8, and is estimated to be around the same distance as HD 104555.[15]
