Star · A8 V
HAT-P-57
HAT-P-57 is a main-sequence star of spectral type A8 V in the constellation Ophiuchus, 950.2 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Constellation | Ophiuchus |
|---|---|
| Distance | 950.2 light-years (291.3 pc) |
| Apparent magnitude | magnitude 10.68 |
| Absolute magnitude | magnitude 3.36 |
| Spectral type | A8 V |
| Surface temperature | 6,330 K |
| Luminosity | 6.4 L☉ |
| Radius | 1.85 R☉ |
| Mass | 2.77 M☉ |
| Age | 1.0 billion years |
| Metallicity [Fe/H] | -0.25 |
| Right ascension (J2000) | 18h 18m 58.4s |
| Declination (J2000) | +10° 35′ 50″ |
| Space velocity (relative to the Sun) | 22.1 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 10.68. Visible from the whole Northern Hemisphere and south to latitude 79° S. North of latitude 79° N it never sets. It stands highest at midnight in June, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1076. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 17 million years.
The Sun seen from there
From a planet around HAT-P-57, the Sun would look like a star of magnitude 12.15, in the direction where our sky has the constellation Monoceros. It would be invisible to the naked eye.
Planets
- HAT-P-57 b 2.47-day orbit · 19.5 R⊕
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.