Location of HAT-P-36 (circled) within Canes Venatici | |
Observation data Epoch J2000.0 Equinox J2000.0 | |
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Constellation | Canes Venatici [1] |
Right ascension | 12h 33m 03.9061s [2] |
Declination | +44° 54′ 55.196″ [2] |
Apparent magnitude (V) | 12.26 |
Characteristics | |
Evolutionary stage | main sequence [3] |
Spectral type | G5V [4] |
Astrometry | |
Radial velocity (Rv) | −16.434 km/s |
Proper motion (μ) | RA: −11.622(8) mas/yr [2] Dec.: 8.138(10) mas/yr [2] |
Parallax (π) | 3.4055±0.0110 mas [2] |
Distance | 958 ± 3 ly (293.6 ± 0.9 pc) |
Details | |
Mass | 1.005±0.020 [5] M☉ |
Radius | 1.023±0.018 [5] R☉ |
Luminosity | 0.969+0.078 −0.073 [3] L☉ |
Surface gravity (log g) | 4.33±0.16 [6] cgs |
Temperature | 5,550±80 [6] K |
Metallicity [Fe/H] | 0.27±0.09 [6] dex |
Rotation | 15.30±0.50 d [7] |
Rotational velocity (v sin i) | 24.0±0.5 [8] km/s |
Age | 6.6+2.9 −1.8 [8] Gyr |
Other designations | |
Tuiren, Gaia DR3 1541532207133249920, TYC 3020-2221-1, 2MASS J12330390+4454552 [9] | |
Database references | |
SIMBAD | data |
HAT-P-36, also referred to as Tuiren [10] is a 12th magnitude G-type main-sequence star estimated to be approximately 958 light-years away from Earth [2] in the constellation Canes Venatici. HAT-P-36 is too faint to be seen with the naked eye, but it is possible to view it with binoculars or a small telescope. In 2012 a hot Jupiter-type exoplanet was discovered orbiting HAT-P-36 with an orbital period of about 1.3 Earth days. [11] In December 2019, HAT-P-36 was named Tuiren and its planetary companion, HAT-P-36b, was named Bran as a result of Ireland's contribution to the 2019 NameExoWorlds campaign. [12] Bran has a mass approximately 1.8 times that of Jupiter and a radius 1.2 times larger.
HAT-P-36 and its planet are named after characters from The Birth of Bran, a story in the book Irish Fairy Tales by James Stephens. The book is a re-telling of various stories from Irish folklore. Tuiren was the aunt of the mythical hero Fionn mac Cumhaill and was turned into a hound by the fairy Uchtdealbh after Tuiren married her husband. Bran and Sceólan were the two puppies mothered by Tuiren while she was a dog. They were cousins of Fionn mac Cumhaill. The names were proposed by John Murphy, a teacher at Regina Mundi College, Cork. [14]
HAT-P-36b (Bran) was discovered in 2012 by the HATNet Project using the transit method. [11] A search for transit timing variation did not result in detection of additional planets in the system as at 2021. [3] Surprisingly, a planetary orbital period increase by 0.014 seconds per year was detected by 2021. [15]
Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
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b (Bran) | 1.832 MJ | 0.02366±0.00016 | 1.327346977(49) | 0 | 86.76±0.076 ° | 1.233±0.025 RJ |
Jupiter | HAT-P-36b (Bran) |
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