08h37m16.4839s, −41° 19′ 08.767″| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Vela |
| Right ascension | 08h37m 16.48335s[1] |
| Declination | −41° 19′ 08.7904″[1] |
| Apparent magnitude (V) | +8.99[2] |
| Characteristics | |
| Evolutionary stage | Main sequence[3] |
| Spectral type | G6 V[3] |
| B−V color index | 0.737±0.005[2] |
| Variable type | Constant[3] |
| Astrometry | |
| Radial velocity (Rv) | +26.31±0.10[4] km/s |
| Proper motion (μ) | RA: −60.993 mas/yr[1] Dec.: 159.192 mas/yr[1] |
| Parallax (π) | 10.3311 ± 0.0144 mas[1] |
| Distance | 315.7 ± 0.4 ly (96.8 ± 0.1 pc) |
| Absolute magnitude (MV) | +4.1±0.2[5] |
| Absolute bolometric magnitude (Mbol) | +3.7±0.2[5] |
| Details[4] | |
| Mass | 1.01±0.04 1.14±0.15[6] M☉ |
| Radius | 1.53±0.03[6] R☉ |
| Luminosity | 2.14+0.68 −0.52 L☉ |
| Surface gravity (log g) | 4.13±0.06 cgs |
| Temperature | 5,564±16 K |
| Metallicity [Fe/H] | +0.23±0.02 dex |
| Rotational velocity (v sin i) | 1.69±0.26 km/s |
| Age | 9.59±1.00 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 73526 is a star in the southern constellationofVela. With an apparent visual magnitude of +8.99,[2] it is much too faint to be viewed with the naked eye. The star is located at a distance of approximately 316 light-years (97parsecs) from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +26 km/s.[4] It is a member of the thin disk population.[4]
The stellar classification of HD 73526 is G6 V,[3] indicating this is a G-type main-sequence star that, like the Sun, is generating energy through core hydrogen fusion. Based on its properties, it may be starting to evolve off the main sequence.[3] This star has slightly more mass than the Sun and a 53% greater radius. The abundance of iron in its atmosphere suggests the star's metallicity – what astronomers term the abundance of elements with higher atomic number than helium – is 70% greater than in the Sun. It is a much older star with an estimated age of nearly ten billion years, and is spinning slowly with a projected rotational velocity of 1.7 km/s. The star is radiating more than double the luminosity of the Sun from its photosphere at an effective temperature of 5,564 K.[4]
On June 13 2002,[8] a 2.1 MJ planet HD 73526 b was announced orbiting HD 73526 in an orbit just a little smaller than that of Venus' orbit around the Sun.[5] This planet receives an insolation 3.65 times that of Earth or 1.89 times that of Venus. This was a single planet system until 2006 when a 2.3 MJ second planet HD 73526 c was discovered. These planets forms a 2:1 orbital resonance with planet b.[3] In fact, they seem to be in a very deep resonance with very long timescale stability due to an ACR (Apsidal Corotation Resonance) the planets seem to satisfy.[9] Although these are minimum masses as the inclinations of these planets are unknown, orbital stability analysis indicates that the orbital inclinations of both planets are likely to be near 90°, making the minimum masses very close to the true masses of the planets.[10]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥2.25±0.12 MJ | 0.65±0.01 | 188.9±0.1 | 0.29±0.03 | — | — |
| c | ≥2.25±0.13 MJ | 1.03±0.02 | 379.1±0.5 | 0.28±0.05 | — | — |
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