HD 181295

HD 181295
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]
Distance252 ± 9 ly
(77 ± 3 pc)
Absolute magnitude (MV)+2.14[5]
Details
Mass1.74[7] M☉
Radius2.35±0.15[8] R☉
Luminosity13.3+0.9
−0.8[1] L☉
Surface gravity (log g)3.84[9] cgs
Temperature6,850±69[8] K
Metallicity [Fe/H]−0.27[10] dex
Rotation2.7 d[11]
Rotational velocity (v sin i)56.9±1.9[11] km/s
Age1.41[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
SIMBADdata

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]

  1. ^ a b c d e f g Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Houk1975 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference David2015 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference Masana2006 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Casagrande2011 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Netopil2017 was invoked but never defined (see the help page).
  11. ^ a b c Cite error: The named reference Reiners2004 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Gontcharov2017 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Makarov2005 was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference Frankowski2006 was invoked but never defined (see the help page).