AT 2021uey
| Observation data Epoch J2000.0 Equinox ICRS | |
|---|---|
| Constellation | Pegasus[1] |
| Right ascension | 21h 38m 10.83s[2] |
| Declination | +26° 27′ 59.78″[2] |
| Characteristics | |
| Evolutionary stage | Main sequence[3] |
| Spectral type | M1V[3] |
| Astrometry | |
| Distance | 3,392 ly (1,040[4] pc) |
| Details | |
| Mass | 0.49+0.16 −0.18 M☉ |
| Temperature | 3680+307 −204 K |
| Other designations | |
| Gaia21dnc, ZTF18abktckv, ASASSN-21mc, UCAC4 583-124062, 2MASS J21381082+2627598, Gaia DR3 1800388069295514496[2] | |
| Database references | |
| SIMBAD | data |
AT 2021uey (originally Gaia 21dnc) is a star located in the galactic disk at a distance of 3392 light-years, or approximately 1040 parsecs, from the Sun, in the zodiacal constellation of Pegasus.[4][5]
It is a red dwarf with a mass of 0.49 solar masses and a temperature of 3680 Kelvin.[4][3] One exoplanet orbits around it, which was detected in 2021 using the gravitational microlensing method and subsequently discovered in 2025.[4]
Planetary system
[edit]
The Gaia space telescope detected a microlensing event as part of its transient search program, assigning it the internal designation Gaia21dnc.[4] Subsequently, ground-based facilities, specifically the Molėtai Astronomical Observatory in Lithuania and the KMTNet telescope network, joined the observations. Analysis of anomalies in the light curve indicated the presence of a planetary companion to the lensing star.[4] Based on thorough data processing, it was determined that this object is a gas giant with a mass of 1.34 Jupiter masses, and its projected distance from the parent star is estimated at 4.01 astronomical units.[4] According to the NASA Exoplanet Archive, the planet's radius is 1.22 Jupiter radius.[6] The planet completes one orbit around its star in 4170 Earth days.[4]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination (°) |
Radius |
|---|---|---|---|---|---|---|
| b | 1.34+0.45 −0.50 MJ |
4.01+1.68 −1.34 |
4170+2910 −1710 |
— | — | — |
See also
[edit]References
[edit]- ↑ "ASASSN-21mc". International Variable Star Index. AAVSO. Retrieved 2021-07-08.
- 1 2 3 "SIMBAD query result: AT2021uey". Centre de Données astronomiques de Strasbourg. Retrieved 2009-04-30.
- 1 2 3 Martin, Pierre-Yves (2025). "Planet AT2021uey b". exoplanet.eu. Retrieved 2025-03-31.
- 1 2 3 4 5 6 7 8 Ban, M.; et al. (45) (31 March 2025). "AT2021uey: A planetary microlensing event outside the Galactic bulge". Astronomy & Astrophysics. 697: A57. arXiv:2503.22331. Bibcode:2025A&A...697A..57B. doi:10.1051/0004-6361/202554236.
- ↑ Volnova, Alina; Aleo, Patrick D.; Gangler, Emmanuel; Ishida, Emille E. O.; Kornilov, Matwey; Korolev, Vladimir; Krushinsky, Vadim; Lavrukhina, Anastasia; Malanchev, Konstantin; Pruzhinskaya, Maria; Russeil, Etienne; Semenikhin, Timofey; Sreejith, Sreevarsha; The SNAD Team (2023-07-26). "The Most Interesting Anomalies Discovered in ZTF DR17 from the SNAD-VI Workshop". Research Notes of the AAS. 7 (7): 155. Bibcode:2023RNAAS...7..155V. doi:10.3847/2515-5172/ace9dd. ISSN 2515-5172.
- ↑ "AT2021ueyL b - NASA Science". science.nasa.gov. 28 March 2025. Retrieved 2025-06-25.
