Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Virgo |
Right ascension | 14h 12m 37.53311s [1] |
Declination | +04° 03′ 36.1166″ [1] |
Apparent magnitude (V) | 11.76 [2] |
Characteristics | |
Spectral type | K1V |
Astrometry | |
Radial velocity (Rv) | 14.10±0.39 [1] km/s |
Proper motion (μ) |
RA: 37.735
mas/
yr
[1] Dec.: -142.816 mas/ yr [1] |
Parallax (π) | 6.9985 ± 0.0204 mas [1] |
Distance | 466 ± 1
ly (142.9 ± 0.4 pc) |
Details [3] | |
Mass | 0.81 M☉ |
Radius | 0.78 R☉ |
Temperature | 5079±88 K |
Metallicity | -0.04±0.08 [4] |
Rotational velocity (v sin i) | 1.8 km/s |
Other designations | |
Database references | |
SIMBAD | data |
HAT-P-26 is a
K-type main-sequence star about 466
light-years (143
parsecs) away. A survey in 2015 did not find any stellar companions in orbit around it,
[5] although a red dwarf companion with a temperature 4000+100
−350
K is suspected on wide orbit.
[6]
The designation HAT-P-26 indicates that this was the 26th star found to have a planet by the HATNet Project.
In August 2022, this planetary system was included among 20 systems to be named by the third NameExoWorlds project. [7] The approved names, proposed by a team from Puerto Rico, were announced in June 2023. HAT-P-26 is named Guahayona and its planet is named Guataubá, after figures from Taíno mythology. [8]
In 2010 a
transiting hot Neptune like planet was detected.
[4] The transiting planet HAT-P-26b was detected by the
HATNet Project using telescopes located in Hawaii and Arizona. The planet is likely formed by pebble accretion mechanism.
[9]
The transmission spectrum of HAT-P-26b was taken in 2015, with the best fit favouring either a cloudless atmosphere or an atmosphere with a low-lying cloud deck.
[10] The atmospheric composition of the planet was measured in 2019, and a water vapor volume fraction of 1.5+2.1
−0.9% was detected. HAT-P-26 is carbon depleted, with a C/O ratio constrained to less than 0.33. Also, the planet's atmosphere contains light metal hydrides.
[11] The measured planetary temperature is equal to 563+58
−54
K.
In 2019, a transit timing variation analysis of HAT-P-26b indicated the possible presence of a second planet in the system on a wide, 1141-days orbit. [12]
In 2023, the atmosphere of the planet was confirmed to contain 12±2% steam at 590+20
−30
K.
[13]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b / Guataubá | >0.0585±0.00717 MJ | 0.0479±0.0006 | 4.234516±0.000015 | 0.124±0.060 | 88.6±0.9 ° | 0.5647±0.0517 RJ |
c (unconfirmed) | — | — | 1141 | — | — | — |
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Virgo |
Right ascension | 14h 12m 37.53311s [1] |
Declination | +04° 03′ 36.1166″ [1] |
Apparent magnitude (V) | 11.76 [2] |
Characteristics | |
Spectral type | K1V |
Astrometry | |
Radial velocity (Rv) | 14.10±0.39 [1] km/s |
Proper motion (μ) |
RA: 37.735
mas/
yr
[1] Dec.: -142.816 mas/ yr [1] |
Parallax (π) | 6.9985 ± 0.0204 mas [1] |
Distance | 466 ± 1
ly (142.9 ± 0.4 pc) |
Details [3] | |
Mass | 0.81 M☉ |
Radius | 0.78 R☉ |
Temperature | 5079±88 K |
Metallicity | -0.04±0.08 [4] |
Rotational velocity (v sin i) | 1.8 km/s |
Other designations | |
Database references | |
SIMBAD | data |
HAT-P-26 is a
K-type main-sequence star about 466
light-years (143
parsecs) away. A survey in 2015 did not find any stellar companions in orbit around it,
[5] although a red dwarf companion with a temperature 4000+100
−350
K is suspected on wide orbit.
[6]
The designation HAT-P-26 indicates that this was the 26th star found to have a planet by the HATNet Project.
In August 2022, this planetary system was included among 20 systems to be named by the third NameExoWorlds project. [7] The approved names, proposed by a team from Puerto Rico, were announced in June 2023. HAT-P-26 is named Guahayona and its planet is named Guataubá, after figures from Taíno mythology. [8]
In 2010 a
transiting hot Neptune like planet was detected.
[4] The transiting planet HAT-P-26b was detected by the
HATNet Project using telescopes located in Hawaii and Arizona. The planet is likely formed by pebble accretion mechanism.
[9]
The transmission spectrum of HAT-P-26b was taken in 2015, with the best fit favouring either a cloudless atmosphere or an atmosphere with a low-lying cloud deck.
[10] The atmospheric composition of the planet was measured in 2019, and a water vapor volume fraction of 1.5+2.1
−0.9% was detected. HAT-P-26 is carbon depleted, with a C/O ratio constrained to less than 0.33. Also, the planet's atmosphere contains light metal hydrides.
[11] The measured planetary temperature is equal to 563+58
−54
K.
In 2019, a transit timing variation analysis of HAT-P-26b indicated the possible presence of a second planet in the system on a wide, 1141-days orbit. [12]
In 2023, the atmosphere of the planet was confirmed to contain 12±2% steam at 590+20
−30
K.
[13]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b / Guataubá | >0.0585±0.00717 MJ | 0.0479±0.0006 | 4.234516±0.000015 | 0.124±0.060 | 88.6±0.9 ° | 0.5647±0.0517 RJ |
c (unconfirmed) | — | — | 1141 | — | — | — |