01h52m50.534s, −19° 30′ 25.107″| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cetus |
| Right ascension | 01h52m 50.534416s[1] |
| Declination | −19° 30′ 25.108238″[1] |
| Apparent magnitude (V) | 7.51[2] |
| Characteristics | |
| Spectral type | G0V[3] |
| B−V color index | 0.607±0.015[2] |
| Astrometry | |
| Radial velocity (Rv) | −7.53±0.13[1] km/s |
| Proper motion (μ) | RA: 22.039±0.022[1] mas/yr Dec.: −97.904±0.016[1] mas/yr |
| Parallax (π) | 19.5342 ± 0.0221 mas[1] |
| Distance | 167.0 ± 0.2 ly (51.19 ± 0.06 pc) |
| Absolute magnitude (MV) | 3.94[2] |
| Details[4] | |
| Mass | 1.12±0.02 M☉ |
| Radius | 1.06±0.01 R☉ |
| Luminosity | 1.17±0.01 L☉ |
| Surface gravity (log g) | 4.43±0.02 cgs |
| Temperature | 5,833±28 K |
| Metallicity [Fe/H] | 0.29±0.03[5] dex |
| Rotational velocity (v sin i) | 5.01[6] km/s |
| Age | 1.6±0.9 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HD 11506 is a star in the equatorial constellationofCetus. It has a yellow hue and can be viewed with a small telescope but is too faint to be visible to the naked eye, having an apparent visual magnitude of 7.51.[2] The distance to this object is 167 light years based on parallax, but it is drifting closer to the Sun with a radial velocity of −7.5 km/s.[1] It has an absolute magnitude of 3.94.[2]
This object is an ordinary G-type main-sequence star with a stellar classification of G0V,[3] which indicates it is generating energy via hydrogen fusion at its core. It is around 1.6[4] billion years old and is spinning with a projected rotational velocity of 5 km/s.[6] The star has 112% of the mass of the Sun and 106% of the Sun's radius. The spectrum shows a higher than solar abundance of elements other than hydrogen and helium – what astronomers term the metallicity.[5] The star is radiating 117% of the Sun's luminosity from its photosphere at an effective temperature of 5,833 K.[4]
The superjovian planet HD 11506 b was discovered orbiting the star by the N2K Consortium in 2007 using the doppler spectroscopy method.[3] In 2009, a second planet discovery was claimed based on Bayesian analysis of the original data.[8] However, in 2015 additional radial velocity measurements showed that the planetary parameters were significantly different than those determined by Bayesian analysis. An additional linear trend in the radial velocities indicates a stellar or planetary companion on a long term orbit.[5] In 2022, the presence of a third planet with an orbital period of 40 years was confirmed, and the mass and inclination of both planet b and the new planet d were measured via astrometry.[9]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| c | ≥0.408±0.057 MJ | 0.774±0.038 | 223.41±0.32 | 0.193±0.038 | — | — |
| b | 4.880+1.986 −0.333 MJ |
2.800+0.123 −0.136 |
1,613.7+4.3 −4.5 |
0.391±0.010 | 112.598+23.304 −52.700° |
— |
| d | 7.383+2.015 −1.085 MJ |
12.235+1.571 −1.762 |
14,723.6+2,801.3 −2,735.0 |
0.061+0.028 −0.022 |
82.004+25.098 −21.421° |
— |
