The HD 154857 System
HD 154857 is a planetary system in the constellation Ara hosting 2 confirmed exoplanets, about 207 light-years from Earth. One of its planets orbits within the habitable zone, where liquid water could exist on a planetary surface.
HD 154857: Star and Habitable Zone
HD 154857
- Spectral type
- G5 V
- Surface temperature
- 5,605 K (Sun: 5,772 K)
- Mass
- 1.72 M☉
- Radius
- 1.76 R☉
Habitable zone of HD 154857: 1.256–2.973 AU (conservative: 1.591–2.819 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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All 2 Planets in the HD 154857 System
| Planet | Type | Orbit | Radius | ESI | Discovered |
|---|---|---|---|---|---|
| HD 154857 b HZ | Cold Gas Giant | 409 d | — | 0.29 | 2004 |
| HD 154857 c | Cold Gas Giant | 3,452 d | — | 0.21 | 2014 |
Discovery History
The first planet found here, HD 154857 b, was discovered in 2004 using the radial velocity method. The most recent addition, HD 154857 c, followed in 2014.
- 2004 — HD 154857 b (Radial Velocity)
- 2014 — HD 154857 c (Radial Velocity)
Frequently Asked Questions About HD 154857
How many planets does HD 154857 have?
HD 154857 has 2 confirmed exoplanets. More may await discovery.
Are any planets in the HD 154857 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 154857?
HD 154857 is about 207 light-years from Earth in the constellation Ara.
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