Star · K0 III/IV
HD 180902
HD 180902 is a giant star of spectral type K0 III/IV in the constellation Sagittarius, 342.8 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Other names | HIP 94951 |
|---|---|
| Constellation | Sagittarius |
| Distance | 342.8 light-years (105.1 pc) |
| Apparent magnitude | magnitude 7.78 |
| Absolute magnitude | magnitude 2.67 |
| Spectral type | K0 III/IV |
| Surface temperature | 4,960 K |
| Luminosity | 9.4 L☉ |
| Radius | 4.16 R☉ |
| Mass | 1.41 M☉ |
| Age | 2.8 billion years |
| Metallicity [Fe/H] | 0.04 |
| Right ascension (J2000) | 19h 19m 17.7s |
| Declination (J2000) | −23° 33′ 29″ |
| Space velocity (relative to the Sun) | 21.6 km/s |
In the sky
Too faint for the naked eye (magnitude 7.78); binoculars will find it. Visible from the whole Southern Hemisphere and north to latitude 66° N. South of latitude 66° S it never sets. It stands highest at midnight in July, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1683. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 6.1 million years.
The Sun seen from there
From a planet around HD 180902, the Sun would look like a star of magnitude 9.94, in the direction where our sky has the constellation Gemini. It would be invisible to the naked eye.
Planets
- HD 180902 b 511-day orbit · 13.5 R⊕
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.