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Gliese 754

Gliese 754
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Telescopium
Right ascension 19h 20m 47.98349s[1]
Declination −45° 33′ 29.6292″[1]
Apparent magnitude (V) 12.25[2]
Characteristics
Spectral type M4V[2]
Astrometry
Radial velocity (Rv)+6.8[3] km/s
Proper motion (μ) RA: +659.330[1] mas/yr
Dec.: −2,897.035[1] mas/yr
Parallax (π)169.2351 ± 0.0588 mas[4]
Distance19.272 ± 0.007 ly
(5.909 ± 0.002 pc)
Details[3]
Mass0.173 M☉
Radius0.205 R☉
Luminosity0.005[5] L☉
Temperature3,202±100[6] K
Metallicity [Fe/H]−0.169[6] dex
Rotation132.651 days
Other designations
GJ 754, L 347-14, LHS 60, LTT 7652, 2MASS J19204795-4533283[7]
Database references
SIMBADdata
Gliese 754 is located in the constellation Telescopium
Gliese 754 is located in the constellation Telescopium
Gliese 754
Location of Gliese 754 in the constellation Telescopium

Gliese 754 is a dim star in the southern constellation of Telescopium. It has an apparent visual magnitude of 12.25,[2] which requires a telescope to view. The star is located at a distance of 19.3 light-years from the Sun based on parallax,[1] and it is drifting further away with a radial velocity of +7 km/s.[3] It is one of the hundred closest stars to the Solar System. Calculations of its orbit around the Milky Way showed that it is eccentric, and indicate that it might be a thick disk object.[8]

The stellar classification of Gliese 754 is M4V,[2] indicating that this is a small red dwarf star on the core hydrogen fusing main sequence. It has 17% of the mass of the Sun and 21% of the Sun's radius.[3] The star is fully convective and is a source of X-ray emission.[9] It is rotating slowly with a period of about 133 days.[3] The metallicity is sub-solar,[6] indicating it has a lower abundance of heavy elements compared to the Sun. It is radiating just 0.5%[5] of the luminosity of the Sun from its photosphere at an effective temperature of around 3,202 K.[6]

  1. ^ a b c d e Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Henry_et_al_2018 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference Newton_et_al_2018 was invoked but never defined (see the help page).
  4. ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  5. ^ a b Cite error: The named reference Mayor_et_al_2009 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference Houdebine_et_al_2016 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Innanen_Flynn_2010 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Wright2018 was invoked but never defined (see the help page).

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