Star · F7V
HAT-P-39
HAT-P-39 is a main-sequence star of spectral type F7V in the constellation Gemini, 2,273 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Constellation | Gemini |
|---|---|
| Distance | 2,273 light-years (697.0 pc) |
| Apparent magnitude | magnitude 12.28 |
| Absolute magnitude | magnitude 3.06 |
| Spectral type | F7V |
| Surface temperature | 6,430 K |
| Luminosity | 4.05 L☉ |
| Radius | 1.63 R☉ |
| Mass | 1.4 M☉ |
| Age | 2.0 billion years |
| Metallicity [Fe/H] | 0.19 |
| Right ascension (J2000) | 7h 35m 02.0s |
| Declination (J2000) | +17° 49′ 48″ |
| Space velocity (relative to the Sun) | 28.7 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 12.28. Visible from the whole Northern Hemisphere and south to latitude 72° S. North of latitude 72° N it never sets. It stands highest at midnight in January, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around 248 BC. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 40 million years.
The Sun seen from there
From a planet around HAT-P-39, the Sun would look like a star of magnitude 14.05, in the direction where our sky has the constellation Sagittarius. It would be invisible to the naked eye.
Planets
- HAT-P-39 b 3.54-day orbit · 17.6 R⊕
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.