HD 30669
Star with an exoplanet in the constellation Caelum
From Wikipedia, the free encyclopedia
HD 30669 is a yellowish-orange hued star located in the southern constellation Caelum, the chisel. It has an apparent magnitude of 9.11,[3] making it readily visible in small telescopes but not to the naked eye. The object is relatively close at a distance of 189 light-years, based on parallax measurements from Gaia DR3.[2] Its distance from the Solar System is rapidly increasing, having a heliocentric radial velocity of 66 km/s.[5]
| Observation data Epoch J2000.0 Equinox ICRS | |
|---|---|
| Constellation | Caelum[1] |
| Right ascension | 04h 48m 28.48538s[2] |
| Declination | −28° 25′ 09.4617″[2] |
| Apparent magnitude (V) | 9.11±0.01[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | G8/K0 V[4] |
| B−V color index | +0.82[3] |
| Astrometry | |
| Radial velocity (Rv) | 65.7±0.4[5] km/s |
| Proper motion (μ) | RA: +237.591 mas/yr[2] Dec.: +50.927 mas/yr[2] |
| Parallax (π) | 17.2896±0.0127 mas[2] |
| Distance | 188.6 ± 0.1 ly (57.84 ± 0.04 pc) |
| Absolute magnitude (MV) | +5.35[1] |
| Details | |
| Mass | 0.92±0.03[6] M☉ |
| Radius | 0.91±0.04[7] R☉ |
| Luminosity | 0.71[8] L☉ |
| Surface gravity (log g) | 4.43±0.06[9] cgs |
| Temperature | 5,353±100[9] K |
| Metallicity [Fe/H] | +0.13[10] dex |
| Rotational velocity (v sin i) | <1.7[7] km/s |
| Age | 7.25±4.64[11] Gyr |
| Other designations | |
| CD−28°1759, CPD−28°661, HD 30669, HIP 22320, SAO 169782, LTT 2095[12] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
Characteristics
HD 30669 has a stellar classification of G8/K0 V[4] — a main sequence star with the characteristics of a star with a class of G8 or K0. It has alternatively been given a class of G9 V. It has 92% the mass of the Sun[6] and 91% its radius.[7] The object radiates 71% the luminosity of the Sun[8] from its photosphere at an effective temperature of 5,353 K[9] from its photosphere. Like most planetary hosts, HD 30669 is metal enriched, having a metallicity 35% above solar levels.[10] The star is extremely chromopsherically inactive and is estimated to be 7+1⁄4 billion years old.[11]
Planetary system
In 2015, C. Motou and colleagues discovered a long period exoplanet orbiting the star during a HARPS survey. It has nearly half the mass of Jupiter and it takes over 4+1⁄2 years to revolve HD 30669 in a slightly eccentric orbit.[7]
A candidate second planet was identified in a 2026 study using HARPS-N. This would be a super-Neptune on an eccentric orbit closer to the star, with a period of 150 days. Despite the eccentric orbits of both planets, dynamical simulations show that the two-planet system is stable.[13]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination (°) |
Radius |
|---|---|---|---|---|---|---|
| .01[13] (unconfirmed) | ≥28.7±3.5 M🜨 | 0.5 | 149.9±0.2 | 0.496+0.088 −0.097 |
— | — |
| b[7] | ≥0.47±0.06 MJ | 2.69±0.08 | 1684±61 | 0.33±0.06[13] | — | — |