HAT-P-36
Star in constellation Canes Venatici
From Wikipedia, the free encyclopedia
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.
 | |
| Observation data Epoch J2000.0 Equinox ICRS | |
|---|---|
| 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, TYC 3020-2221-1, 2MASS J12330390+4454552, Gaia DR3 1541532207133249920[9] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
Etymology
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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]
Planetary system
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 |
|---|---|---|---|---|---|---|
| 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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