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 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[1] |
| Right ascension | 23h 54m 33.48s[2] |
| Declination | −04° 43′ 23.9″[2] |
| Apparent magnitude (V) | 9.715±0.005[3] |
| Characteristics | |
| Evolutionary stage | main sequence[4] |
| Spectral type | G5 V[5] |
| Astrometry | |
| Radial velocity (Rv) | −62.75±0.17[2] km/s |
| Proper motion (μ) | RA: −112.585 mas/yr[2] Dec.: −8.324 mas/yr[2] |
| Parallax (π) | 9.3912±0.0214 mas[2] |
| Distance | 347.3 ± 0.8 ly (106.5 ± 0.2 pc) |
| Details[6] | |
| Mass | 1.013+0.069 −0.061 M☉ |
| Radius | 1.147±0.028 R☉ |
| Luminosity | 1.33+0.04 −0.05 L☉ |
| Surface gravity (log g) | 4.32+0.04 −0.05 cgs |
| Temperature | 5,784±60 K |
| Metallicity [Fe/H] | 0.05±0.05 dex |
| Rotational velocity (v sin i) | 2.1±0.5 km/s |
| Age | 7.0+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[7][3] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
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.[2]
Planetary system
[edit]In 2025, three exoplanets planets orbiting HD 224018 were discovered by both the radial velocity and transit methods. A fourth candidate planet is suspected.[8]
| 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
[edit]References
[edit]- ^ 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.
- ^ a b c d e f 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 "HD 224018 | NASA Exoplanet Archive". exoplanetarchive.ipac.caltech.edu. Retrieved 2025-10-07.
- ^ 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.
- ^ 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.
- ^ a b 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].
- ^ "HD 224018". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2025-04-21.
- ^ Cowing, Keith (2025-08-23). "Discovery Of A Multi-planetary System Orbiting The Aged Sun-like Star HD 224018". Astrobiology. Retrieved 2025-10-07.
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