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WASP-45

WASP-45
Observation data
Epoch J2000      Equinox J2000
Constellation Sculptor[1]
Right ascension 00h 20m 56.99413s[2]
Declination −35° 59′ 53.7466″[2]
Apparent magnitude (V) 11.8[3]
Characteristics
Evolutionary stage main sequence[2]
Spectral type K2V[4]
Astrometry
Radial velocity (Rv)4.71±0.33[2] km/s
Proper motion (μ) RA: 52.831 mas/yr[2]
Dec.: −46.940 mas/yr[2]
Parallax (π)4.6520±0.0226 mas[2]
Distance701 ± 3 ly
(215 ± 1 pc)
Details[5]
Mass0.932+0.045
−0.046 M☉
Radius0.891±0.013 R☉
Luminosity0.510±0.013 L☉
Surface gravity (log g)4.508+0.023
−0.025 cgs
Temperature5167±29 K
Metallicity [Fe/H]0.388+0.090
−0.10 dex
Rotational velocity (v sin i)2.3±0.7 km/s
Age5.4+4.7
−3.5 Gyr
Other designations
TOI-229, TIC 120610833, WASP-45, TYC 6996-583-1, GSC 06996-00583, 2MASS J00205699-3559537[6]
Database references
SIMBADdata
Exoplanet Archivedata

WASP-45 is a K-type main-sequence star about 701 light-years (215 parsecs) away. The star's age cannot be well constrained, but it is probably older than the Sun. Yet WASP-45 is enriched in heavy elements compared to the Sun, having 240% of the solar abundance.[5] WASP-45 has low ultraviolet emission, therefore it is suspected to have a low starspot activity,[7] although chromospheric activity was reported elsewhere.[4]

There is a companion star at a separation of 4.4 arcseconds, corresponding to 929 AU. The companion is estimated to have a mass of 0.157 M☉ and a temperature of 3,154 K. Although it shares a similar distance and common proper motion with the primary star, its relative space velocity appears to be high enough that the pair are not gravitationally bound.[8]

  1. ^ Cite error: The named reference Roman1987 was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference tycho2 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Anderson2011 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Addison2019 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference simbad was invoked but never defined (see the help page).
  7. ^ Shkolnik, Evgenya L. (2013), "An Ultraviolet Investigation of Activity on Exoplanet Host Stars", The Astrophysical Journal, 766 (1): 9, arXiv:1301.6192, Bibcode:2013ApJ...766....9S, doi:10.1088/0004-637X/766/1/9, S2CID 118415788
  8. ^ Cite error: The named reference Mugrauer2019 was invoked but never defined (see the help page).

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