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Revision as of 18:06, 6 January 2025 by 21.Andromedae (talk | contribs) (published a new article)(diff) ← Previous revision | Latest revision (diff) | Newer revision → (diff) F-type star in the constellation Hercules| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Hercules |
| Right ascension | 16 52 44.720267 |
| Declination | 16° 34′ 47.83998″ |
| Apparent magnitude (V) | 10.22±0.03 |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | F |
| Astrometry | |
| Radial velocity (Rv) | −22.28±1.23 km/s |
| Proper motion (μ) | RA: −8.314 mas/yr Dec.: −9.351 mas/yr |
| Parallax (π) | 3.7367 ± 0.0197 mas |
| Distance | 873 ± 5 ly (268 ± 1 pc) |
| Details | |
| Mass | 1.447+0.075 −0.078 M☉ |
| Radius | 1.698+0.062 −0.057 R☉ |
| Luminosity | 4.71+0.38 −0.27 L☉ |
| Surface gravity (log g) | 4.139+0.041 −0.046 cgs |
| Temperature | 6,530+160 −150 K |
| Metallicity | 0.068+0.070 −0.062 dex |
| Rotation | 1.08 days |
| Rotational velocity (v sin i) | 81.9±1.7 km/s |
| Age | 1.77+0.88 −0.68 Gyr |
| Other designations | |
| BD+16 3058, TIC 392476080, TYC 1521-208-1, GSC 01521-00208, 2MASS J16524472+1634478 | |
| Database references | |
| SIMBAD | data |
TOI-2109 is a 10.2 magnitude star in the Hercules constellation. It is located at 870 ly (268 pc) from Earth based on parallax measurements. This star host one confirmed exoplanet.
Characteristics
TOI-2109 is a F-type main-sequence star, a star moderately larger, hotter and more luminous than the Sun that is fusing atoms of hydrogen into helium at its core. It is 1.7 larger than the Sun, comparable to Sirius A, 1.4 times more massive and nearly five times brighter. The effective temperature of its surface lies at 6,530 K (6,260 °C; 11,290 °F), which is 10% hotter than the Sun, whose temperature measures 5,772 K (5,499 °C; 9,930 °F). Its age is uncertain, between one and 2.5 billion years. The rotation period of this star is about the same as Earth's orbital period, but only about 1/30 that of the Sun.
Planetary system
TOI-2109 hosts at least one exoplanet, which is named TOI-2109 b and was discovered in 2021 via the transit method.
TOI-2109 b is a hot Jupiter, with the shortest orbital period of its class. It completes an orbit every just 0.67 days (16 hours), being separated by only 0.01791 astronomical units (2,679,000 km) from its host. This is the shortest period among hot Jupiters, a class of which this planet make part. The extreme proximity also means TOI-2109 b is strongly irradiated: The dayside temperature measures 3,630 K (3,360 °C; 6,070 °F), while the nighside is around 1,000 degrees cooler, at less than 2,500 K (2,230 °C; 4,040 °F). Only 55 Cancri e and KELT-9b have hotter dayside temperatures. This planet is around 30% larger than Jupiter and five times more massive. Its orbit is well-aligned to the star's axis.
In 2024, low-amplitude transit-timing variations were detected using the CHEOPS space telescope, which could be atribuited to a yet unseen exoplanet. This yet unconfirmed planet should have an orbital period greater than 1.125 days and its characteristics remain unconstrained.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 5.02±0.75 MJ | 0.01791±0.00065 | 0.67247414(28) | 0 | 70.74±0.37° | 1.347±0.047 RJ |
| c (unconfirmed) | — | — | >1.13; 1.57, 2.67, 88 or 117 | — | — | — |
Notes
- Calculated using the p sin i of 1.05 days divided by the sine of the inclination, which is 67±6 degrees.
References
- "Find the constellation which contains given sky coordinates". djm.cc. Retrieved 2025-01-06.
- ^ Cite error: The named reference
GaiaEDR3was invoked but never defined (see the help page). - Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000-03-01). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27 – L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
- ^ Wong, Ian; Shporer, Avi; Zhou, George; Kitzmann, Daniel; Komacek, Thaddeus D.; Tan, Xianyu; Tronsgaard, René; Buchhave, Lars A.; Vissapragada, Shreyas; Greklek-McKeon, Michael; Rodriguez, Joseph E.; Ahlers, John P.; Quinn, Samuel N.; Furlan, Elise; Howell, Steve B. (2021-12-01). "TOI-2109: An Ultrahot Gas Giant on a 16 hr Orbit". The Astronomical Journal. 162: 256. Bibcode:2021AJ....162..256W. doi:10.3847/1538-3881/ac26bd. ISSN 0004-6256.
{{cite journal}}: CS1 maint: unflagged free DOI (link) - ^ 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.
- ^ Harre, J.-V.; Smith, A. M. S.; Barros, S. C. C.; Singh, V.; Korth, J.; Brandeker, A.; Cameron, A. Collier; Lendl, M.; Wilson, T. G. (2024-11-12). "A close outer companion to the ultra-hot Jupiter TOI-2109 b?". arXiv:411.07797.
{{cite arXiv}}: Check|arxiv=value (help)
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