HD 224018

HD 224018

Location of HD 224018 in the night sky. The star is marked within the red rectangle.
Observation data
Epoch J2016.0      Equinox ICRS
Constellation Aquarius
Right ascension 23h 54m 33.48s
Declination −04° 43′ 23.9″
Apparent magnitude (V) 9.715±0.005
Characteristics
Evolutionary stage main sequence
Spectral type G5 V
Astrometry
Radial velocity (Rv)−62.75±0.17 km/s
Proper motion (μ) RA: −112.585 mas/yr
Dec.: −8.324 mas/yr
Parallax (π)9.3912±0.0214 mas
Distance347.3 ± 0.8 ly
(106.5 ± 0.2 pc)
Details
Mass1.013+0.069
−0.061 M☉
Radius1.147±0.028 R☉
Luminosity1.33+0.04
−0.05 L☉
Surface gravity (log g)4.32+0.04
−0.05 cgs
Temperature5,784±60 K
Metallicity [Fe/H]0.05±0.05 dex
Rotational velocity (v sin i)2.1±0.5 km/s
Age7.0+3.4
−3.2 Gyr
Other designations
BD−05 6079, HD 224018, SAO 146968, K2-420, EPIC 246214735, TYC 5256-992-1, GSC 05256-00992, 2MASS J23543349-0443238
Database references
SIMBADdata
Exoplanet Archivedata

HD 224018 is a high-proper-motion G5 V type star. It has surface temperature of 5,784±60 K. HD 224018 has a yellow hue and is not visible to the naked eye with an apparent visual magnitude of 9.715±0.005. Based upon parallax measurements, it is located 347 light-years (106 parsecs) in distance from the Sun. The object is drifting towards the Sun with a radial velocity of −62.75±0.17 km/s.

Planetary system

In 2025, three exoplanets planets orbiting HD 224018 were discovered by both the radial velocity and transit methods. A fourth candidate planet is suspected.

The HD 224018 planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination
(°)		 Radius
b 0.013±0.003 MJ 0.0952±00.0020 10.6413±0.0028 0.060+0.070
−0.040		 — 0.0812+0.0571
−0.0509 RJ
c ≥0.0327+0.0041
−0.0035 MJ		 0.217±0.005 36.57669+0.00019
−0.00017		 0.02±0.02 — 0.216+0.006
−0.007 RJ
d 0.013+0.006
−0.005 MJ		 0.53+0.06
−0.02		 138.0731+27.6127
−0.0050		 0.04+0.05
−0.04		 — 0.21±0.01 RJ
e (unconfirmed) ≥151+13
−14 M🜨		 8.60+1.50
−1.60		 9129.0+2499.0
−2479.0		 0.60+0.07
−0.08		 — —

See also

References

  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
  2. 1 2 3 4 5 6 7 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 "HD 224018 | NASA Exoplanet Archive". exoplanetarchive.ipac.caltech.edu. Retrieved 2025-10-07.
  4. ↑ Doyle, Lauren; Armstrong, David J.; Bayliss, Daniel; Rodel, Toby; Kunovac, Vedad (2024). "The TESS-SPOC FFI target sample explored with Gaia". Monthly Notices of the Royal Astronomical Society. 529 (2): 1802. arXiv:2403.02407. Bibcode:2024MNRAS.529.1802D. doi:10.1093/mnras/stae616.
  5. ↑ Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5". Michigan Spectral Survey. 5. Bibcode:1999MSS...C05....0H.
  6. 1 2 Damasso, M.; Naponiello, L.; Anna John, A.; Egger, J. A.; Cretignier, M.; Mortier, A.; Bonomo, A. S.; Collier Cameron, A.; Dumusque, X.; Wilson, T.; Buchhave, L.; Nicholson, B.; Stalport, M.; Ghedina, A.; Latham, D. W.; Livingston, J.; Malavolta, L.; Sozzetti, A.; Jenkins, J. M.; Mantovan, G.; Martínez Fiorenzano, A. F.; Palethorpe, L.; Tronsgaard, R.; Udry, S.; Watson, C. A. (2025). "Discovery of a multi-planetary system orbiting the aged Sun-like star HD 224018". arXiv:2508.13684 [astro-ph.EP].
  7. ↑ "HD 224018". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2025-04-21.
  8. ↑ Cowing, Keith (2025-08-23). "Discovery Of A Multi-planetary System Orbiting The Aged Sun-like Star HD 224018". Astrobiology. Retrieved 2025-10-07.