The star
The star
V1298 Tau
- Type
- K1
- Surface
- ≈ 4,970 K
- Size
- 1.32 × the Sun
- Mass
- 1.10 × the Sun
- Brightness
- 0.954 × the Sun
- Habitable zone
- 0.766–1.85 AU
The planets
V1298 Tau
V1298 Tau c
- Year
- 8.25 days
- Distance from star
- 0.0824 AU
- Mass
- 4.7 Earths
- Size
- 5.1 × Earth
- Temperature
- ≈ 953 K (+680 °C)
- Found
- 2019, transit (K2)
V1298 Tau
V1298 Tau d
- Year
- 12.40 days
- Distance from star
- 0.108 AU
- Mass
- 6 Earths
- Size
- 6.5 × Earth
- Temperature
- ≈ 831 K (+558 °C)
- Found
- 2019, transit (K2)
V1298 Tau
V1298 Tau b
- Year
- 24.14 days
- Distance from star
- 0.169 AU
- Mass
- 13 Earths
- Size
- 9.4 × Earth
- Temperature
- ≈ 666 K (+393 °C)
- Found
- 2019, transit (K2)
V1298 Tau
V1298 Tau e
- Year
- 48.68 days
- Distance from star
- 0.269 AU
- Mass
- 15 Earths
- Size
- 10 × Earth
- Temperature
- ≈ 527 K (+254 °C)
- Found
- 2019, transit (K2)
Masses found by the wobble method are minimums, because the orbit's tilt is unknown. Temperatures are equilibrium estimates for a bare planet, before any atmosphere.
How we know
The shadow
The planet passes in front of its star and dims it by a fraction of a percent, every orbit. The dip gives the planet's size and year.
Sources
- Planet and star parameters: NASA Exoplanet Archive, Planetary Systems Composite Parameters, retrieved 1 Nov 2026. This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with NASA under the Exoplanet Exploration Program.
- Position: HYG Database v4.1 (CC BY-SA 4.0).
- Habitable zone: a simple estimate from the star's brightness (√L × 0.95 to 1.67 AU), shown as a guide.