TOI-4468
| Observation data Epoch J2000.0 Equinox ICRS | |
|---|---|
| Constellation | Draco[1] |
| Right ascension | 17h 22m 18.0s[1] |
| Declination | +72.64536°°[2] |
| Apparent magnitude (V) | 14.0[3] |
| Characteristics | |
| Evolutionary stage | Main sequence[3] |
| Spectral type | K[4] |
| Astrometry | |
| Parallax (π) | 2.645±0.013 mas |
| Distance | 1,233 ± 6 ly (378 ± 2 pc) |
| Details | |
| Mass | 0.805+0.042 −0038 M☉ |
| Radius | 0.771+0.02 −0.018 R☉ |
| Surface gravity (log g) | 4.571+0.02 −0.022 cgs |
| Metallicity [Fe/H] | -0.03±0.16 dex |
| Age | 7.4+3.9 −3.6[3] Gyr |
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.[3] 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
[edit]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.[3]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination (°) |
Radius |
|---|---|---|---|---|---|---|
| b | 0.5352+0.0305 −0.0277 |
0.03592+0.0006 −0.00057 |
2.77085931±0.00000036 | 0.030+0.026 −0.020 |
89.35+0.44 −0.49 |
1.0072+0.0277 −0.025[4] |
| c | 0.035±0.013 | 0.0667±0.0011 | 7.013900±0.00002 | 0.122+0.16 −0.083 |
88.95+0.66 −0.5 |
0.2757+0.0125 −0.0107[4] |
| d (unconfirmed) | 0.979+0.154 −0.16 MJ |
1.332+0.079 −0.061 |
624±53 | — | — | — |
References
[edit]- 1 2 "Planet TOI-4468 C". 2026.
- ↑ "Planet TOI-4468.03". 2026.
- 1 2 3 4 5 6 Livesey, Joseph R.; et al. (2026). "Discovery and Characterization of the TOI-4468 Planetary System: A Transiting Hot Jupiter with a Lone Nearby Outer Companion". arXiv:2608.25208 [astro-ph.EP].
- 1 2 3 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.