HD 40307
HD 40307 is an orange (K-type) main-sequence star located approximately 42 light-years away in the constellation of Pictor (the Easel), taking its primary name from its Henry Draper Catalogue designation. It is calculated to be slightly less massive than the Sun. The star has six known planets, three discovered in 2008 and three more in 2012. One of them, HD 40307 g, is a potential super-Earth in the habitable zone, with an orbital period of about 200 days. This object might be capable of supporting liquid water on its surface, although much more information must be acquired before its habitability can be assessed.
Location of HD 40307 in the night sky. The star is marked within the red diamond below the word "Pictor". | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Pictor |
| Right ascension | 05h 54m 04.24050s |
| Declination | −60° 01′ 24.4930″ |
| Apparent magnitude (V) | 7.17 |
| Characteristics | |
| Spectral type | K2.5V |
| B−V color index | 0.93 |
| Astrometry | |
| Radial velocity (Rv) | 31.08±0.12 km/s |
| Proper motion (μ) | RA: −52.174±0.023 mas/yr Dec.: −60.059±0.025 mas/yr |
| Parallax (π) | 77.3261 ± 0.0170 mas |
| Distance | 42.179 ± 0.009 ly (12.932 ± 0.003 pc) |
| Absolute magnitude (MV) | 6.57±0.01 |
| Details | |
| Mass | 0.75+0.03 −0.04 M☉ |
| Radius | 0.716 ± 0.010 R☉ |
| Luminosity (bolometric) | 0.23 L☉ |
| Luminosity (visual, LV) | 0.20 L☉ |
| Surface gravity (log g) | 4.47 ± 0.16 cgs |
| Temperature | 4977 ± 59 K |
| Metallicity [Fe/H] | −0.31 ± 0.03 dex |
| Rotation | 31.8±6.7 d |
| Rotational velocity (v sin i) | 3 km/s |
| Age | 1.2 (≥ 0.2) Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| ARICNS | data |
No stellar companions to HD 40307 were detected as in 2018.
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