Astronomy:KELT-10

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Short description: Star in the constellation Telescopium

Coordinates: Sky map 18h 58m 11.6095s, −47° 00′ 11.6643″

KELT-10
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Telescopium
Right ascension  18h 58m 11.6095s[1]
Declination −47° 00′ 11.6643″[1]
Apparent magnitude (V) +10.62[2]
Characteristics
Spectral type G0 V[3]
B−V color index +0.72[2]
Variable type PT
Astrometry
Radial velocity (Rv)31.61±1.29[4] km/s
Proper motion (μ) RA: +1.464[1] mas/yr
Dec.: −15.600[1] mas/yr
Parallax (π)5.2834 ± 0.0174[1] mas
Distance617 ± 2 ly
(189.3 ± 0.6 pc)
Details[3]
Mass1.07+0.12
−0.15
[5] M
Radius1.21+0.05−0.03 R
Luminosity1.40±0.02[4] L
Surface gravity (log g)4.32+0.02
−0.03
 cgs
Temperature5,948±74 K
Metallicity [Fe/H]+0.1±0.1 dex
Age4.5±0.7 Gyr
Other designations
Database references
SIMBADdata

KELT-10, also known as CD−47°12635, is a sun-like star in the southern constellation Telescopium. It has an apparent magnitude of 10.62,[2] making it readily visible in telescopes, but not to the naked eye. Parallax measurements from the Gaia spacecraft place the star at a distance of 617 light years;[1] it is currently receding with a radial velocity of 31.6 km/s.[4]

KELT-10 has a stellar classification of G0 V,[3] indicating that it is a yellow dwarf like the Sun. However, the object is 7% more massive[5] and 21% larger.[3] It is also slightly hotter, with an effective temperature of 5,948 K[3] compared to the Sun's of 5,778 K. The star has a similar age, with an age of 4.5 billion years[3] and more luminous, having a luminosity 40% greater.[4] KELT-10's iron abundance is 123% that of the Sun,[3] consistent with a planetary host. However, this amount is poorly constrained.

Planetary System

In 2015, a "hot Jupiter" orbiting the star was discovered by the KELT-South telescope. KELT-10b orbits at a distance 10 time closer than Mercury orbits the Sun, and is bloated due to its orbit.

The KELT-10 planetary system[3]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b 0.68±0.04 MJ 0.052±0.001 4.1662739±0.0000063 0 (assumed) 88.61+0.86−0.74° 1.4±0.1 RJ

References

  1. Jump up to: 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode2021A&A...649A...1G.  Gaia EDR3 record for this source at VizieR.
  2. Jump up to: 2.0 2.1 2.2 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode2000A&A...355L..27H. 
  3. Jump up to: 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 Kuhn, Rudolf B. et al. (15 April 2016). "KELT-10b: the first transiting exoplanet from the KELT-South survey – a hot sub-Jupiter transiting aV= 10.7 early G-star". Monthly Notices of the Royal Astronomical Society 459 (4): 4281–4298. doi:10.1093/mnras/stw880. ISSN 0035-8711. Bibcode2016MNRAS.459.4281K. 
  4. Jump up to: 4.0 4.1 4.2 4.3 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  5. Jump up to: 5.0 5.1 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256. Bibcode2019AJ....158..138S.