HD 181295
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| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Telescopium |
| Right ascension | 19h 22m 37.74947s[1] |
| Declination | −51° 13′ 52.6099″[1] |
| Apparent magnitude (V) | 6.42±0.01[2] |
| Characteristics | |
| Evolutionary stage | main sequence star[3] |
| Spectral type | F0 V[4] |
| B−V color index | 0.328±0.007[5] |
| Astrometry | |
| Radial velocity (Rv) | −35.7±0.5[6] km/s |
| Proper motion (μ) | RA: 73.087 mas/yr[1] Dec.: −8.778 mas/yr[1] |
| Parallax (π) | 12.9643±0.4818 mas[1] |
| Distance | 252 ± 9 ly (77 ± 3 pc) |
| Absolute magnitude (MV) | +2.14[5] |
| Details | |
| Mass | 1.74[7] M☉ |
| Radius | 2.35±0.15[8] R☉ |
| Luminosity | 13.3+0.9 −0.8[1] L☉ |
| Surface gravity (log g) | 3.84[9] cgs |
| Temperature | 6,850±69[8] K |
| Metallicity [Fe/H] | −0.27[10] dex |
| Rotation | 2.7 d[11] |
| Rotational velocity (v sin i) | 56.9±1.9[11] km/s |
| Age | 1.41[7] Gyr |
| Other designations | |
| 56 G. Telescopii[12], CD−51°12054, CPD−51°11215, GC 22691, HD 181295, HIP 95239, SAO 246053, TIC 424748146[13] | |
| Database references | |
| SIMBAD | data |
HD 181295 is a star located in the southern constellation Telescopium. It has an apparent magnitude of 6.42,[2] placing it near the limit of naked eye visibility, even under ideal conditions. The object is located relatively close at a distance of approximately 252 light-years based on Gaia DR3 parallax measurements,[1] and it is currently drifting closer with a heliocentric radial velocity of −35.7 km/s.[6] At its current distance, HD 181295's brightness is diminished by 0.22 magnitudes[14] due to interstellar extinction and it has an absolute magnitude +2.14.[5]
Proper motion variations from this star was first detected in a 2005 Hipparcos proper motion survey.[15] These variations indicated the presence of an unseen companion tugging on the star. As of the follow up survey published in 2006, it is considered a probable astrometric binary with a 97% chance.[16]
The visible component has a stellar classification of F0 V,[4] indicating that it is an ordinary F-type main-sequence star that is generating energy via hydrogen fusion at its core. It has 1.74 times the mass of the Sun[7] and 2.35 times the radius of the Sun.[8] It radiates 13.3 times the luminosity of the Sun[1] from its photosphere at an effective temperature of 6,850 K,[8] giving it the typical yellowish-white of a F-type star. At the age of 1.41 billion years,[7] HD 181295A is a rather evolved star for its class, having completed 77.3% of its main sequence lifetime.[3] The star has an iron abundance of [Fe/H] = −0.27[10] and it spins modestly with a projected rotational velocity of 56.9 km/s within 2.7 days.[11]
