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]
Distance356.0 ± 0.6 ly
(109.2 ± 0.2 pc)
Details[3]
Mass1.15±0.04 M☉
Radius1.43±0.02 R☉
Surface gravity (log g)4.19±0.03 cgs
Temperature6,310±100 K
Metallicity [Fe/H]−0.16±0.05 dex
Rotation5.0±0.9 days
Rotational velocity (v sin i)8.38±0.50 km/s
Age3.97±0.75 Gyr
Other designations
BD+20 3347, HD 152843, SAO 84691, PPM 105343, TOI-2319, TIC 349488688, TYC 1529-224-1[4]
Database references
SIMBADdata

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]

The HD 152843 planetary system[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

  1. ↑ "Finding the constellation which contains given sky coordinates". djm.cc. 2 August 2008. Retrieved 2024-01-10.
  2. 1 2 3 4 5 6 7 8 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.
  3. 1 2 3 4 5 6 7 8 9 10 11 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.
  4. ↑ "HD 152843". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 1 November 2023.
  5. 1 2 3 4 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].
  6. ↑ "HD 152843 | NASA Exoplanet Archive". exoplanetarchive.ipac.caltech.edu. Retrieved 2023-10-22.
  7. ↑ "HD 152843 | NASA Exoplanet Archive". exoplanetarchive.ipac.caltech.edu. Retrieved 2023-10-22.
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