HD 137388

HD 137388, named Karaka[6], is a class K2IV (orange subgiant) star in the constellation Apus. Its apparent magnitude is 8.70 and it is approximately 132 light years away based on parallax.

HD 137388
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Apus
Right ascension  15h 35m 39.921s[1]
Declination −80° 12′ 16.54″[1]
Apparent magnitude (V) 8.70[2]
Characteristics
Evolutionary stage subgiant
Spectral type K2IV[3]
Astrometry
Radial velocity (Rv)26.01[1] km/s
Proper motion (μ) RA: -49.570[1] mas/yr
Dec.: 41.135[1] mas/yr
Parallax (π)24.6722 ± 0.0327[1] mas
Distance132.2 ± 0.2 ly
(40.53 ± 0.05 pc)
Absolute magnitude (MV)5.73
Details
Mass0.93[4] M☉
Radius0.860[4] R☉
Luminosity0.528[1] L☉
Surface gravity (log g)4.449[4] cgs
Temperature5,297[4] K
Metallicity [Fe/H]+0.29[4] dex
Rotational velocity (v sin i)2.207[4] km/s
Age2.991[4] Gyr
Other designations
Karaka, CPD−79° 844, HD 137388, HIP 76351[5]
Database references
SIMBADdata

It has a surface temperature of 5,297 K and is 58% as luminous and 93% as massive as the Sun, with 86% of its diameter, and is thought to be around 2.99 billion years old.

Name

HD 137388 was given the proper name Karaka by representatives of New Zealand in the IAU's NameExoWorlds contest, after the native New Zealand karaka tree.[6]

Planetary system

Radial velocity studies indicate that it has a planet, originally named HD 137388 b (mass 0.223 MJ, period 330d). It orbits at an average distance of 0.89 AU.[7][8] The planet was officially designated Kererū, the Māori name of the New Zealand pigeon, by the IAU in the same contest that named its parent star.[6]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27. Bibcode:2000A&A...355L..27H.
  3. Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc-The Southern Sample". The Astronomical Journal. 132 (1): 161–170. arXiv:astro-ph/0603770. Bibcode:2006AJ....132..161G. doi:10.1086/504637.
  4. Soto, M. G.; Jenkins, J. S. (2018). "Spectroscopic Parameters and atmosphEric ChemIstriEs of Stars (SPECIES). I. Code description and dwarf stars catalogue". Astronomy and Astrophysics. 615: A76. arXiv:1801.09698. Bibcode:2018A&A...615A..76S. doi:10.1051/0004-6361/201731533.
  5. SIMBAD, HD 137388 (accessed 20 September 2015)
  6. "Approved names (§ New Zealand)". Name Exo Worlds. IAU. Retrieved 19 December 2019.
  7. Dumusque, X.; Lovis, C.; Ségransan, D.; Mayor, M.; Udry, S.; Benz, W.; Bouchy, F.; Lo Curto, G.; Mordasini, C.; Pepe, F.; Queloz, D.; Santos, N. C.; Naef, D. (2011). "The HARPS Search for Southern Extra-solar Planets. XXX. Planetary Systems around Stars with Solar-like Magnetic Cycles and Short-term Activity Variation". Astronomy & Astrophysics. 535: A55–A66. arXiv:1107.1748. Bibcode:2011A&A...535A..55D. doi:10.1051/0004-6361/201117148. Archived from the original on 2015-05-29. Retrieved 2016-05-29.
  8. Extrasolar Planet Encyclopaedia, HD 137388B (accessed 20 September 2015)
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