TOI 1338

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TOI 1338
Position of TOI 1338 in Pictor
Observation data
Epoch J2000      Equinox J2000
Constellation Pictor
Right ascension  06h 08m 31.94s.[1]
Declination −59° 32′ 27.55″.[1]
Apparent magnitude (V) 11.975±0.025
Radial velocity (Rv)24.68±8.08[2] km/s
Proper motion (μ) RA: -12.258±0.037[2] mas/yr
Dec.: 34.405±0.041[2] mas/yr
Parallax (π)2.4774 ± 0.0196[2] mas
Distance1,320 ± 10 ly
(404 ± 3 pc)
TOI 1338 A
Mass1.20[3] M
TOI 1338 B
Mass0.3250[3] M
Other designations
TYC 8533-950-1, EBLM J0608-59, 2MASS J06083197-5932280, RAVE J060832.0-593228
Database references
Extrasolar Planets

TOI 1338 is a binary star system, discovered by TESS, and TESS's first binary system confirmed to contain a planet, called a circumbinary planet. The system is 1,300 light-years away in the constellation Pictor.[1][2] The two stars with masses of about 1.2 and 0.325 M revolve around each other every 14.6 days.[3]

Nomenclature and history[edit]

The acronym "TOI" refers to stars and exoplanets studied by TESS, and is short for: "Transiting Exoplanet Survey Satellite Object of Interest". The planet was found by a high school student, who joined the Goddard Space Flight Center as a summer intern. He looked through light curves that were flagged as eclipsing binaries by volunteers of the Planet Hunters citizen science project.[4]

Planetary system[edit]

The TOI 1338 planetary system[5]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b ≥ 6.9 M 94

The planet TOI 1338 b, announced 6 January 2020, was the first discovered circumbinary planet.

See Also[edit]


  1. ^ a b c "ExoFOP TIC 260128333". Retrieved 9 January 2020.
  2. ^ a b c d e Gaia Collaboration (1 August 2018). "Gaia Data Release 2 - Summary of the contents and survey properties". Astronomy & Astrophysics. 616: A1. doi:10.1051/0004-6361/201833051. ISSN 0004-6361.
  3. ^ a b c Martin, David V.; Triaud, Amaury H. M. J.; Udry, Stephane; Marmier, Maxime; Maxted, Pierre F. L.; Cameron, Andrew Collier; Hellier, Coel; Pepe, Francesco; Pollacco, Don; Segransan, Damien; West, Richard (April 2019). "The BEBOP radial-velocity survey for circumbinary planets I. Eight years of CORALIE observations of 47 single-line eclipsing binaries and abundance constraints on the masses of circumbinary planets". Astronomy & Astrophysics. 624: A68. doi:10.1051/0004-6361/201833669. ISSN 0004-6361.
  4. ^ "Discovery Alert! High School Student Finds a World With Two Suns". Exoplanet Exploration: Planets Beyond our Solar System. Retrieved 14 February 2020.
  5. ^ Reddy, Francis (6 January 2020). "TESS Discovers Its 1st Planet Orbiting 2 Stars". NASA.

External link[edit]