KELT-24

KELT-24

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Ursa Major
Right ascension	10^h 47^m 38.35063^s[1]
Declination	+71° 39′ 21.1525″[1]
Characteristics
Evolutionary stage	main sequence star
Spectral type	F7V
Variable type	planetary transit
Astrometry
Radial velocity (Rv)	−5.54±0.24[1] km/s
Proper motion (μ)	RA: −56.061(17) mas/yr[1] Dec.: −34.526(21) mas/yr[1]
Parallax (π)	10.3218 ± 0.0180 mas[1]
Distance	316.0 ± 0.6 ly (96.9 ± 0.2 pc)
Details
Mass	1.30 M☉
Radius	1.52 R☉
Luminosity	0.565 L☉
Temperature	6415 K
Metallicity [Fe/H]	-0.090 Fe dex
Age	2.8 Gyr
Other designations
MASCARA-3, KELT-24, HD 93148, HIP 52796
Database references
SIMBAD	data

KELT-24 (HD 93148, MASCARA-3) is a single star in the constellation Ursa Major at a distance of approximately 316 light-years (about 96.8 parsecs) from Sun. The apparent magnitude of the star is +8.33^m. The star's age is estimated to be about 1.6 billion years.[2][3][4] As an F-type main-sequence star, it is similar to the Sun, but slightly hotter and more luminous.

Nomenclature

This star was first catalogued in the Henry Draper Catalogue as HD 93148. The Henry Draper Catalogue gave stars visible to the naked eye in suitable conditions a designation, indicating that this star can be seen with the naked eye. But in 2019, the Multi-site All-Sky Camera and the Kilodegree Extremely Little Telescope announced the discovery of the exoplanet KELT-24b/MASCARA-3b around this star. Thus, it is most commonly known as KELT-24, although the star is sometimes catalogued as MASCARA-3.

Characteristics

KELT-24 is a yellow-white star with a spectral class of F5 or F7. Its mass is about 1.4 M_☉, its radius is about 1.555 R_☉, and its luminosity is about 3.466 L_☉. Its effective temperature is about 6437 K.

Planetary system

In 2019, the discovery of the Hot Jupiter type planet KELT-24b/MASCARA-3b was announced by the Multi-site All-Sky CAmeRA and the Kilodegree Extremely Little Telescope. TESS data confirmed that no additional companions are orbiting this star.[5][6] Since this discovery, the system is now called KELT-24 or MASCARA-3.

The KELT-24 planetary system

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	5.18 MJ	0.06969	5.6	0.08	83.11°	1.272 RJ

References

1. 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.
2. "KELT-24 | NASA Exoplanet Archive". exoplanetarchive.ipac.caltech.edu. Retrieved 10 September 2023.
3. Rodriguez, Joseph E.; Eastman, Jason D.; Zhou, George; Quinn, Samuel N.; Beatty, Thomas G.; Penev, Kaloyan; Johnson, Marshall C.; Cargile, Phillip A.; Latham, David W.; Bieryla, Allyson; Collins, Karen A.; Dressing, Courtney D.; Ciardi, David R.; Relles, Howard M.; Murawski, Gabriel; Nishiumi, Taku; Yonehara, Atsunori; Ishimaru, Ryo; Yoshida, Fumi; Gregorio, Joao; Lund, Michael B.; Stevens, Daniel J.; Stassun, Keivan G.; Gaudi, B. Scott; Colón, Knicole D.; Pepper, Joshua; Narita, Norio; Awiphan, Supachai; Chuanraksasat, Pongpichit; Benni, Paul; Zambelli, Roberto; Garrison, Lehman H.; Wilson, Maurice L.; Cornachione, Matthew A.; Wang, Sharon X.; Labadie-Bartz, Jonathan; Rodríguez, Romy; Siverd, Robert J.; Yao, Xinyu; Bayliss, Daniel; Berlind, Perry; Calkins, Michael L.; Christiansen, Jessie L.; Cohen, David H.; Conti, Dennis M.; Curtis, Ivan A.; Depoy, D. L.; Esquerdo, Gilbert A.; Evans, Phil; Feliz, Dax; Fulton, Benjamin J.; Holoien, Thomas W.-S.; James, David J.; Jayasinghe, Tharindu; Jang-Condell, Hannah; Jensen, Eric L. N.; Johnson, John A.; Joner, Michael D.; Khakpash, Somayeh; Kielkopf, John F.; Kuhn, Rudolf B.; Manner, Mark; Marshall, Jennifer L.; McLeod, Kim K.; McCrady, Nate; Oberst, Thomas E.; Oelkers, Ryan J.; Penny, Matthew T.; Reed, Phillip A.; Sliski, David H.; Shappee, B. J.; Stephens, Denise C.; Stockdale, Chris; Tan, Thiam-Guan; Trueblood, Mark; Trueblood, Pat; Villanueva, Steven; Wittenmyer, Robert A.; Wright, Jason T. (23 October 2019). "KELT-24b: A 5M _J Planet on a 5.6 day Well-aligned Orbit around the Young V = 8.3 F-star HD 93148". The Astronomical Journal. 158 (5): 197. arXiv:1906.03276. Bibcode:2019AJ....158..197R. doi:10.3847/1538-3881/ab4136. ISSN 1538-3881.
4. Pillitteri, I.; Colombo, S.; Micela, G.; Wolk, S. J. (1 May 2023). "The X-ray activity of F stars with hot Jupiters: KELT-24 versus WASP-18". Astronomy & Astrophysics. 673: A61. arXiv:2304.00854. Bibcode:2023A&A...673A..61P. doi:10.1051/0004-6361/202245467. ISSN 0004-6361. S2CID 257913773. Retrieved 10 September 2023.
5. Maciejewski, G. (2020), "Search for Planets in Hot Jupiter Systems with Multi-Sector TESS Photometry. I. No Companions in Planetary Systems KELT-18, KELT-23, KELT-24, Qatar-8, WASP-62, WASP-100, WASP-119, and WASP-126", Acta Astronomica, 70 (3): 181, arXiv:2010.11977, Bibcode:2020AcA....70..181M, doi:10.32023/0001-5237/70.3.2, S2CID 225061977
6. "Exoplanet-catalog". Exoplanet Exploration: Planets Beyond our Solar System. Retrieved 10 September 2023.