Star · K3 V
NGTS-21
NGTS-21 is a main-sequence star of spectral type K3 V in the constellation Microscopium, 1,934 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Constellation | Microscopium |
|---|---|
| Distance | 1,934 light-years (592.9 pc) |
| Apparent magnitude | magnitude 15.51 |
| Absolute magnitude | magnitude 6.65 |
| Spectral type | K3 V |
| Surface temperature | 4,660 K |
| Luminosity | 0.289 L☉ |
| Radius | 0.86 R☉ |
| Mass | 0.72 M☉ |
| Age | 10.0 billion years |
| Metallicity [Fe/H] | -0.26 |
| Right ascension (J2000) | 20h 45m 02.0s |
| Declination (J2000) | −35° 25′ 40″ |
| Space velocity (relative to the Sun) | 43.5 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 15.51. Visible from the whole Southern Hemisphere and north to latitude 55° N. South of latitude 55° 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 92. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 34 million years.
The Sun seen from there
From a planet around NGTS-21, the Sun would look like a star of magnitude 13.69, in the direction where our sky has the constellation Lynx. It would be invisible to the naked eye.
Planets
- NGTS-21 b 1.54-day orbit · 14.9 R⊕
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.