Star · G0 V
HD 209458
HD 209458 is a main-sequence star of spectral type G0 V in the constellation Pegasus, 157.0 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Other names | HIP 108859 |
|---|---|
| Constellation | Pegasus |
| Distance | 157.0 light-years (48.1 pc) |
| Apparent magnitude | magnitude 7.65 |
| Absolute magnitude | magnitude 4.24 |
| Spectral type | G0 V |
| Surface temperature | 6,090 K |
| Luminosity | 1.7 L☉ |
| Radius | 1.19 R☉ |
| Mass | 1.23 M☉ |
| Age | 3.1 billion years |
| Metallicity [Fe/H] | 0.01 |
| Right ascension (J2000) | 22h 03m 10.8s |
| Declination (J2000) | +18° 53′ 03″ |
| Space velocity (relative to the Sun) | 16.8 km/s |
In the sky
Too faint for the naked eye (magnitude 7.65); binoculars will find it. Visible from the whole Northern Hemisphere and south to latitude 71° S. North of latitude 71° 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 1869. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.8 million years.
The Sun seen from there
From a planet around HD 209458, the Sun would look like a star of magnitude 8.24, in the direction where our sky has the constellation Hydra. It would be invisible to the naked eye.
Planets
- HD 209458 b 3.52-day orbit · 15.6 R⊕
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 109450 10.3 light-years
- HIP 109490 10.5 light-years
- HIP 107558 13.3 light-years
- HIP 107175 13.9 light-years
- HIP 107494 16.6 light-years
- HIP 109842 16.6 light-years
- HIP 108822 18.8 light-years
- 2MASS J21555848+2345307 19.1 light-years
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.