AT2021ueyLb
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 Photometric data and fitted light curve of the event AT2021uey | |
| Discovery | |
|---|---|
| Discovered by | Makiko Ban et al. |
| Discovery date | March 28, 2025 |
| Microlensing | |
| Orbital characteristics | |
| 4.01+1.68 −1.34 AU | |
| 4170+2910 −1710 d | |
| Star | AT2021ueyL |
| Physical characteristics | |
| 1.22 RJ (estimate)[1] | |
| Mass | 1.34+0.45 −0.50 MJ |
AT2021ueyLb is an exoplanet orbiting the star AT2021ueyL, located 3392 light-years away from Earth in the constellation Pegasus.[2] The planet was discovered in 2021 using the gravitational microlensing method.[2]
The microlensing event was initially detected by the Gaia space telescope as part of its transient monitoring program. The initial event was given the internal designation Gaia21dnc. Subsequently, ground-based observatories, including the Molėtai Astronomical Observatory in Lithuania and the KMTNet telescope network, joined the observations. Analysis of anomalies in the light curve confirmed the presence of a planetary companion to the lensing star.[2] After thorough verification and data analysis, scientists were finally able to determine that it is a gas giant located at a distance of 3392 light-years, with a mass 1.34 times that of Jupiter.[2] The NASA Exoplanet Archive estimates the planet's radius at 1.22 Rj.[1] It orbits a low-mass M1V type red dwarf star, with a mass of 0.49 Solar masses and an effective temperature of 3680 K.[2] The planet completes one orbit around its star in 4170 days, with a projected distance to the star of 4.01 astronomical units.[2]
It is one of the few planets found by Gaia using microlensing in the galactic halo, rather than its central bulge.[2]
