Exoplanet · Neptune-like planet
KMT-2021-BLG-1689L b
KMT-2021-BLG-1689L b is a Neptune-like planet orbiting the star KMT-2021-BLG-1689L. It was discovered in 2022 by the Microlensing method.
| Host star | KMT-2021-BLG-1689L |
|---|---|
| Distance | 23,500 light-years (7,200 pc) |
| Orbital radius | 2.5 AU |
| Radius | 7.71 R⊕ · 0.688 R♃ |
| Mass | 46 M⊕ · 0.145 M♃ |
| Density | 0.552 g/cm³ |
| Surface gravity | 0.774 × Earth |
| Discovery method | Microlensing |
| Discovery year | 2022 |
| Discovered by | KMTNet |
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.
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.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.