HD 177365
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| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Telescopium |
| Right ascension | 19h 06m 54.81838s[1] |
| Declination | −50° 19′ 23.3136″[1] |
| Apparent magnitude (V) | 6.27±0.01[2] |
| Characteristics | |
| Spectral type | B9 V[3] |
| B−V color index | −0.10[4] |
| Astrometry | |
| Radial velocity (Rv) | 15.5±0.7[1] km/s |
| Proper motion (μ) | RA: −2.721 mas/yr[1] Dec.: −31.275 mas/yr[1] |
| Parallax (π) | 8.7497±0.1414 mas[1] |
| Distance | 373 ± 6 ly (114 ± 2 pc) |
| Absolute magnitude (MV) | +0.16[5] |
| Details | |
| Mass | 3.05+0.45 −0.33[6] M☉ |
| Radius | 3.33+0.12 −0.15[6] R☉ |
| Luminosity | 119[7] L☉ |
| Surface gravity (log g) | 3.88+0.09 −0.05[6] cgs |
| Temperature | 11,557+275 −352[6] K |
| Metallicity [Fe/H] | −0.11[8] dex |
| Age | 226[9] Myr |
| Other designations | |
| 46 G. Telescopii[10], CD−50°12326, CPD−50°10955, GC 26265, HD 177365, HIP 93860, SAO 245925, WDS 19070-5019[11] | |
| Database references | |
| SIMBAD | data |
HD 177365 is a visual binary[12] located in the southern constellation Telescopium. It has an apparent magnitude of 6.27,[2] placing it near the limit for naked eye visibility, even under ideal conditions. Gaia DR3 parallax measurements imply a distance of 373 light-years and it is currently receding with a heliocentric radial velocity of 15.5 km/s.[1] At its current distance, HD 177365's brightness is diminished by two-tenths of a magnitude due to interstellar extinction[13] and it has an absolute magnitude of +0.16.[5]
The binarity of the system was first noticed in a 1996 United States Naval Observatory survey.[14] A Hipparcos proper motion survey published in 2006 catalogued the primary as a probable astrometric binary with an 89.6% chance.[15] HD 177365 B, the companion, is a 16th magnitude star located 101.3" away along a position angle of 218° as of 2015.[14]
The visible component has a stellar classification of B9 V,[3] indicating that it is an ordinary B-type main-sequence star that is generating energy via hydrogen fusion. It has 3.05 times the mass of the Sun[6] and 3.33 times the radius of the Sun.[6] It radiates 119 times the luminosity of the Sun[7] from its photosphere at an effective temperature of 11,557 K.[6] HD 177365 A is slightly metal deficient with an iron abundance 78% that of the Sun's ([Fe/H] = −0.11)[8] and it is estimated to be 226 million years old.[9]
