Star · K2III
HAT-P-40
HAT-P-40 is a giant star of spectral type K2III in the constellation Lacerta, 1,588 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Constellation | Lacerta |
|---|---|
| Distance | 1,588 light-years (487.0 pc) |
| Apparent magnitude | magnitude 11.44 |
| Absolute magnitude | magnitude 3.00 |
| Spectral type | K2III |
| Surface temperature | 6,080 K |
| Luminosity | 6 L☉ |
| Radius | 1.94 R☉ |
| Mass | 1.03 M☉ |
| Age | 2.7 billion years |
| Metallicity [Fe/H] | 0.22 |
| Right ascension (J2000) | 22h 22m 03.1s |
| Declination (J2000) | +45° 27′ 26″ |
| Space velocity (relative to the Sun) | 35.5 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 11.44. Visible from the whole Northern Hemisphere and south to latitude 45° S. North of latitude 45° N it never sets. It stands highest at midnight in August, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 438. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 28 million years.
The Sun seen from there
From a planet around HAT-P-40, the Sun would look like a star of magnitude 13.27, in the direction where our sky has the constellation Vela. It would be invisible to the naked eye.
Planets
- HAT-P-40 b 4.46-day orbit · 17 R⊕
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.