Eta Telescopii

Eta Telescopii
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Telescopium
Right ascension 19h 22m 51.20608s[1]
Declination −54° 25′ 26.1456″[1]
Apparent magnitude (V) +5.05[2]
Characteristics
Spectral type A0 Vn[3] + M7V/M8V[4]
B−V color index +0.02[2]
Astrometry
Radial velocity (Rv)−5.6±2.8[5] km/s
Proper motion (μ) RA: 25.824±0.073[1] mas/yr
Dec.: −82.965±0.061[1] mas/yr
Parallax (π)20.6028 ± 0.0988 mas[1]
Distance158.3 ± 0.8 ly
(48.5 ± 0.2 pc)
Absolute magnitude (MV)+1.61[6]
Orbit[7]
PrimaryA
CompanionB
Period (P)~1,100 years
Semi-major axis (a)142+18
−11 AU
Eccentricity (e)0.5±0.1
Inclination (i)79°+5°
−6°°
Details
A
Mass2.09[8] M☉
Radius1.61[9] R☉
Luminosity24[10] L☉
Surface gravity (log g)4.60[11] cgs
Temperature11,941±406[11] K
Rotational velocity (v sin i)330[11] km/s
Age12[10] Myr
B
Mass35+7
−8[7] MJup
Radius2.28±0.03[7] RJup
Luminosity3.311+0.077
−0.075×10−3[7] L☉
Surface gravity (log g)4.3+0.1
−0.2[7] cgs
Temperature2830+20
−30[7] K
Age~1–~2[7] Myr
HD 181327
Mass1.39[12] M☉
Radius1.37[13][a] R☉
Surface gravity (log g)4.48[14] cgs
Temperature6,541[14] K
Metallicity [Fe/H]−0.14±0.08[14] dex
Rotational velocity (v sin i)21[14] km/s
Age14.3±3.1[15]–26[12] Myr
Other designations
η Tel, CPD−54° 9339, HD 181296, HIP 95261, HR 7329, SAO 246055[16]
Database references
SIMBADdata

Eta Telescopii (η Telescopii) is a white-hued star in the southern constellation of Telescopium. This is an A-type main sequence star with an apparent visual magnitude of +5.03. It is approximately 158 light years from Earth[1] and is a member of the Beta Pictoris Moving Group of stars that share a common motion through space.[10] It forms a wide binary system with the star HD 181327[17] and has a substellar companion orbiting around it, named Eta Telescopii B.[8]

  1. ^ a b c d e f Cite error: The named reference Gaia EDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference Wyatt2007 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Lowrance2000 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Youngblood2021 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c d e f g Cite error: The named reference chai was invoked but never defined (see the help page).
  8. ^ a b Nogueira, P. H.; Lazzoni, C.; Zurlo, A.; Bhowmik, T.; Donoso-Oliva, C.; Desidera, S.; Milli, J.; Pérez, S.; Delorme, P. (2024-05-07). "Astrometric and photometric characterization of η Tel B combining two decades of observations". Astronomy & Astrophysics. 687: A301. arXiv:2405.04723. doi:10.1051/0004-6361/202449222.
  9. ^ Cite error: The named reference Rhee2007 was invoked but never defined (see the help page).
  10. ^ a b c Cite error: The named reference smith2009 was invoked but never defined (see the help page).
  11. ^ a b c Cite error: The named reference David2015 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference nielsen was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference cruzalebes was invoked but never defined (see the help page).
  14. ^ a b c d Cite error: The named reference chavero was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference runaway was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  17. ^ Cite error: The named reference neuhauser2011 was invoked but never defined (see the help page).


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