The HD 40307 System
HD 40307 is a planetary system in the constellation Pictor hosting 5 confirmed exoplanets, about 42 light-years from Earth. One of its planets orbits within the habitable zone, where liquid water could exist on a planetary surface.
HD 40307: Star and Habitable Zone
HD 40307
- Spectral type
- K2.5 V
- Surface temperature
- 4,956 K (Sun: 5,772 K)
- Mass
- 0.77 M☉
- Luminosity
- 0.2296 L☉
- Age
- 4.5 billion years (Sun: 4.6)
Habitable zone of HD 40307: 0.376–0.911 AU (conservative: 0.476–0.864 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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All 5 Planets in the HD 40307 System
| Planet | Type | Orbit | Radius | ESI | Discovered |
|---|---|---|---|---|---|
| HD 40307 b | Super Earth | 4.3 d | — | 0.28 | 2009 |
| HD 40307 c | Super Earth | 9.6 d | — | 0.27 | 2009 |
| HD 40307 d | Super Earth | 20 d | — | 0.30 | 2009 |
| HD 40307 f | Super Earth | 52 d | — | 0.52 | 2013 |
| HD 40307 g HZ | Super Earth | 198 d | — | 0.66 | 2013 |
Discovery History
The first planet found here, HD 40307 b, was discovered in 2009 using the radial velocity method. The most recent addition, HD 40307 g, followed in 2013.
- 2009 — HD 40307 b (Radial Velocity)
- 2009 — HD 40307 c (Radial Velocity)
- 2009 — HD 40307 d (Radial Velocity)
- 2013 — HD 40307 f (Radial Velocity)
- 2013 — HD 40307 g (Radial Velocity)
Frequently Asked Questions About HD 40307
How many planets does HD 40307 have?
HD 40307 has 5 confirmed exoplanets. More may await discovery.
Are any planets in the HD 40307 system habitable?
One planet in the system orbits within the habitable zone, where liquid water could exist. Actual habitability depends on atmospheres and composition, which are not yet known.
How far away is HD 40307?
HD 40307 is about 42 light-years from Earth in the constellation Pictor.
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