Star · K4V
KMT-2021-BLG-1689L
KMT-2021-BLG-1689L is a main-sequence star of spectral type K4V in the constellation Sagittarius, 23,500 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Constellation | Sagittarius |
|---|---|
| Distance | 23,500 light-years (7,200 pc) |
| Apparent magnitude | magnitude 21.94 |
| Absolute magnitude | magnitude 7.65 |
| Spectral type | K4V |
| Surface temperature | 4,570 K |
| Luminosity | 0.129 L☉ |
| Radius | 0.574 R☉ |
| Mass | 0.58 M☉ |
| Right ascension (J2000) | 17h 58m 19.0s |
| Declination (J2000) | −30° 08′ 43″ |
In the sky
A telescope is needed to see it: its apparent magnitude is 21.94. Visible from the whole Southern Hemisphere and north to latitude 60° N. South of latitude 60° S 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 23 thousand years ago. At that time Homo sapiens was spreading out of Africa; there was no farming yet. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 417 million years.
The Sun seen from there
From a planet around KMT-2021-BLG-1689L, the Sun would look like a star of magnitude 19.12, in the direction where our sky has the constellation Auriga. It would be invisible to the naked eye.
Planets
- KMT-2021-BLG-1689L b 7.71 R⊕
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.