The Kepler-1921 System
Kepler-1921 is a planetary system in the constellation Cygnus hosting 2 confirmed exoplanets, about 3,030 light-years from Earth.
Size Comparison: The Planets of Kepler-1921
Kepler-1921: Star and Habitable Zone
Kepler-1921
- Surface temperature
- 6,120 K (Sun: 5,772 K)
- Mass
- 1.25 M☉
- Radius
- 2.00 R☉
Habitable zone of Kepler-1921: 1.649–3.854 AU (conservative: 2.089–3.654 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
See the full interactive habitable-zone view in the Exoplanet Explorer app ›
All 2 Planets in the Kepler-1921 System
| Planet | Type | Orbit | Radius | ESI | Discovered |
|---|---|---|---|---|---|
| Kepler-1921 b | Mini Neptune | 20 d | 2.89 R⊕ | 0.22 | 2021 |
| Kepler-1921 c | Lava World | 3.2 d | 1.41 R⊕ | 0.28 | 2023 |
Discovery History
The first planet found here, Kepler-1921 b, was discovered in 2021 using the transit method. The most recent addition, Kepler-1921 c, followed in 2023.
- 2021 — Kepler-1921 b (Transit)
- 2023 — Kepler-1921 c (Transit)
Frequently Asked Questions About Kepler-1921
How many planets does Kepler-1921 have?
Kepler-1921 has 2 confirmed exoplanets. More may await discovery.
Are any planets in the Kepler-1921 system habitable?
None of the known planets in Kepler-1921 orbit within the star's habitable zone.
How far away is Kepler-1921?
Kepler-1921 is about 3,030 light-years from Earth in the constellation Cygnus.
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