HD 152843 (also designated as TOI-2319) is a single star with a pair of close-orbiting exoplanets,[4] located in the northern constellation of Hercules. It is positioned at a distance of 356 light years from the Sun based on parallax measurements,[2] and at that range is too faint to be viewed with the naked eye, having an apparent visual magnitude of 8.85.[4] The system is receding further away with a radial velocity of 10 km/s.[2]
This is a G-type main-sequence star with a stellar classification of G0.[4] It has 1.15 times the mass and 1.43 times the girth of the Sun. Around four billion years of age,[4] HD 152843 is a quiet star, showing very little magnetic activity in its chromosphere.[7] The abundance of iron, a measure of the star's metallicity, is somewhat lower than in the Sun. It is spinning with a projected rotational velocity of 8.4 km/s.[4]
Planetary system
This star has two confirmed exoplanets orbiting it, being designated HD 152843 b and HD 152843 c. Both were discovered using NASA’s Transiting Exoplanet Survey Satellite (TESS) when they were observed transiting their host star.[4]
HD 152843 b is the closest planet to HD 152843, orbiting its host star in just 11.62 days. The planet has 9.8 Earth masses and 3.1 Earth radii. The planet orbits the star at a distance of 0.105 astronomical units (au), has an orbital eccentricity of 0.05, and has an orbital inclination of 89.3°.[8][7]
HD 152843 c is the second planet in the star system and farthest planet from its star. It has 9.7 Earth masses and 5.9 Earth radii. It orbits its host star at a speed of 7.1 kilometers a second, with its orbital eccentricity being 0.07 and an orbital inclination of 89.2°.[8] Its low density of 0.253+0.059
−0.057 g⋅cm−3 makes it a super-puff planet.[7]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 9.82+1.71 −1.61 M🜨 |
0.1049+0.0029 −0.003 |
11.62071+0.000096 −0.000106 |
0.046+0.058 −0.033 |
89.26+0.51 −0.58° |
3.05±0.11 R🜨 |
| c | 9.67+1.97 −1.92 M🜨 |
0.1482+0.0041 −0.0042 |
19.502104+0.000074 −0.000085 |
0.074+0.072 −0.05 |
89.21+0.53 −0.4° |
5.94+0.18 −0.16 R🜨 |
References
- ^ "Finding the constellation which contains given sky coordinates". djm.cc. 2 August 2008. Retrieved 2024-01-10.
- ^ a b c d e f g 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.
- ^ a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "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.
- ^ a b c d e f g h i Eisner, N. L.; et al. (August 2021). "Planet Hunters TESS III: two transiting planets around the bright G dwarf HD 152843". Monthly Notices of the Royal Astronomical Society. 505 (2): 1827–1840. arXiv:2106.04603. Bibcode:2021MNRAS.505.1827E. doi:10.1093/mnras/stab1253. S2CID 235377108.
- ^ a b c Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues. 2246: II/246. Bibcode:2003yCat.2246....0C.
- ^ "HD 152843". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 1 November 2023.
- ^ a b c d Nicholson, B. A.; et al. (August 2024). "HD152843 b & c: the masses and orbital periods of a sub-Neptune and a superpuff Neptune". Monthly Notices of the Royal Astronomical Society. 532 (4): 4632–4644. arXiv:2310.15068. Bibcode:2024MNRAS.532.4632N. doi:10.1093/mnras/stae1821. S2CID 264436430.
- ^ a b "HD 152843 | NASA Exoplanet Archive". exoplanetarchive.ipac.caltech.edu. Retrieved 2023-10-22.
