HD 152843
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hercules[1] |
| Right ascension | 16h 55m 08.35611s[2] |
| Declination | +20° 29′ 28.7945″[2] |
| Apparent magnitude (V) | 8.85[3] |
| Characteristics | |
| Evolutionary stage | Main sequence[3] |
| Spectral type | G0[3] |
| B−V color index | 0.53[3] |
| Astrometry | |
| Radial velocity (Rv) | 10.06±0.15[2] km/s |
| Proper motion (μ) | RA: 14.838 mas/yr[2] Dec.: 44.635 mas/yr[2] |
| Parallax (π) | 9.1607 ± 0.0152 mas[2] |
| Distance | 356.0 ± 0.6 ly (109.2 ± 0.2 pc) |
| Details[3] | |
| Mass | 1.15±0.04 M☉ |
| Radius | 1.43±0.02 R☉ |
| Surface gravity (log g) | 4.19±0.03 cgs |
| Temperature | 6,310±100 K |
| Metallicity [Fe/H] | −0.16±0.05 dex |
| Rotation | 5.0±0.9 days |
| Rotational velocity (v sin i) | 8.38±0.50 km/s |
| Age | 3.97±0.75 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 152843 (also designated as TOI-2319) is a single star with a pair of close-orbiting exoplanets,[3] 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.[3] 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.[3] It has 1.15 times the mass and 1.43 times the girth of the Sun. Around four billion years of age,[3] HD 152843 is a quiet star, showing very little magnetic activity in its chromosphere.[5] 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.[3]
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.[3]
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°.[6][5]
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°.[7] Its low density makes it a super-puff planet.[5]
| 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 c d e f g h i j k Eisner, N. L.; Nicholson, B. A.; 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.
- ^ "HD 152843". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 1 November 2023.
- ^ a b c d Nicholson, B. A.; Aigrain, S.; et al. (October 2023). "HD152843 b & c: the masses and orbital periods of a sub-Neptune and a super-puff Neptune". arXiv:2310.15068 [astro-ph.EP].
- ^ "HD 152843 | NASA Exoplanet Archive". exoplanetarchive.ipac.caltech.edu. Retrieved 2023-10-22.
- ^ "HD 152843 | NASA Exoplanet Archive". exoplanetarchive.ipac.caltech.edu. Retrieved 2023-10-22.
