TOI-4468

TOI-4468
Observation data
Epoch J2000.0      Equinox ICRS
Constellation Draco
Right ascension 17h 22m 18.02979s
Declination +72° 38′ 43.4211″
Apparent magnitude (V) 14.0
Characteristics
Evolutionary stage Main sequence
Spectral type K
Astrometry
Radial velocity (Rv)−19.14±2.43 km/s
Proper motion (μ) RA: −7.005 mas/yr
Dec.: −5.103 mas/yr
Parallax (π)2.6450±0.0134 mas
Distance1,233 ± 6 ly
(378 ± 2 pc)
Details
Mass0.805+0.042
−0.038 M☉
Radius0.771+0.020
−0.018 R☉
Luminosity0.381+0.036
−0.029 L☉
Surface gravity (log g)4.571+0.020
−0.022 cgs
Temperature5170+120
−110 K
Metallicity [Fe/H]−0.03±0.16 dex
Age7.4+3.9
−3.6 Gyr
Other designations
TOI-4468, TIC 441763252
Database references
SIMBADdata
Exoplanet Archivedata

TOI-4468 is a star. It is smaller than the Sun with about 80.5% the mass, and 77.1% the radius. It is located approximately 1233 light years from Earth. TOI-4468 is a single star in the constellation Draco. It is 7.4 billion years old, much older than the Sun's 4.5 billion years. TOI-4468's spectral type is unknown, although its lifespan is likely to be that of a K-type star because of its size and mass.

When TOI-4468 was observed in August 2026 no nearby stars were detected.

Planetary system

In August 2026, two planets were discovered in its orbit: TOI-4468 b, a hot Jupiter on a three-day orbit and a close outer companion, TOI-4468 c, with a seven-day orbit. They were both identified using radial velocity and transit methods. The researchers could not rule out the presence of closer planets closer, although any such planets would be smaller than Earth. The study also detected a 624-day signal, which could be caused by either an additional planet or a star.

The TOI-4468 planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination
(°)		 Radius
b 170.1+9.7
−8.8 M🜨		 0.03592+0.00060
−0.00057		 2.77085931(36) 0.030+0.026
−0.020		 89.35+0.44
−0.49		 11.29+0.31
−0.28 R🜨
c 11.1+4.0
−2.6 M🜨		 0.0667±0.0011 7.013900(20) 0.122+0.16
−0.083		 88.95+0.66
−0.50		 3.09+0.14
−0.12 R🜨
.03 (unconfirmed) ≥0.98 MJ 1.332+0.079
−0.061		 624+53
−38		 — — —

Notes

  1. ↑ This is a prediction based on mass-radius relationships; the planet's mass has not been measured.

References

  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
  2. 1 2 3 4 5 6 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. 1 2 3 4 5 6 Livesey, Joseph R.; Hord, Benjamin J.; et al. (August 2026). "Discovery and Characterization of the TOI-4468 Planetary System: A Transiting Hot Jupiter with a Lone Nearby Outer Companion". The Astronomical Journal. arXiv:2608.25208.
  4. ↑ Hord, Benjamin; Livesey, Joseph; Becker, Juliette (2024). "TOI-4468 and the Emerging Trends in Systems Hosting Hot Jupiters with Nearby Companion Planets". Bulletin of the Aas. 56 (4). doi:10.3847/25c2cfeb.e7ccaa3b.
  5. ↑ "TOI-4468". SIMBAD. Centre de données astronomiques de Strasbourg.