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TOI-1431 b, also known as MASCARA-5b, is an ultra-hot Jupiter exoplanet orbiting TOI-1431 in the constellation of Cepheus. It has an orbital period of 2.7 days. Its dayside temperature is 2,700 K (2,427 °C), making it hotter than 40% of stars in our galaxy. The nightside temperature is 2,600 K (2,300 °C).

References

1. "Exoplanet-catalog". Exoplanet Exploration: Planets Beyond our Solar System. Retrieved 2023-09-05.
2. "Scientists uncover a 'hellish' planet so hot it could vaporize most metals". CNET. April 27, 2021. Retrieved April 27, 2021.
3. "'Hellish' new planet discovered". University of Southern Queensland. April 27, 2021. Retrieved April 27, 2021.
4. Brett Christopher Addison; et al. (2021), "TOI-1431b/MASCARA-5b: An Ultra-hot Jupiter Orbiting One of the Hottest & Brightest Known Exoplanet Host Stars", Posters from the Tess Science Conference Ii (Tsc2: 64, arXiv:2104.12078, Bibcode:2021tsc2.confE..64A, doi:10.5281/zenodo.5126266, S2CID 240578462
5. Stangret, M.; et al. (2021), "The obliquity and atmosphere of the ultra-hot Jupiter TOI-1431b (MASCARA-5b): A misaligned orbit and no signs of atomic or molecular absorptions", Astronomy & Astrophysics, 654: A73, arXiv:2104.12414, Bibcode:2021A&A...654A..73S, doi:10.1051/0004-6361/202040100, S2CID 233393996

v t e Constellation of Cepheus
List of stars in Cepheus Cepheus in Chinese astronomy
Stars	Bayer α (Alderamin) β (Alfirk) γ (Errai) δ ε ζ η θ ι κ λ μ (Garnet Star) ν ξ (Kurhah) ο π ρ ρ Flamsteed 7 9 11 14 16 19 24 2 UMi Variable AR T V W RW VV VW WZ DH DO MY PV S SS ST U V354 V381 V419 HR 597 881 7955 8281 8442 8702 8748 8938 9038 HD 1 197911 204521 Other Gliese 809 WISE 0313+7807 WR 156 IRAS 23077+6707
Exoplanets γ Cephei Ab (Tadmor) TOI-1431 b
Star clusters	NGC 188 6939 7023 7129 7142 7160 7380 7419 7429 7510 Other Palomar 1
Nebulae	NGC NGC 40 NGC 7129 NGC 7139 NGC 7354 NGC 7538 NGC 7822 Other Seahorse Nebula Elephant's Trunk Nebula Ghost Nebula Gyulbudaghian's Nebula IC 1396 Iris Nebula L1157 S 155 SSTGFLS J222557+601148
Galaxies	NGC 2276 2300 6952 Other 3C 61.1 S5 0014+81 NVSS 2146+82 UGC 11861
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• Cepheus (constellation)
• Exoplanets discovered in 2021
• Transiting exoplanets
• Exoplanets discovered by TESS
• Exoplanets discovered by MASCARA
• Exoplanet stubs