YSES 2
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Musca |
| Right ascension | 11h 27m 55.35s |
| Declination | −66° 26′ 04.5″ |
| Apparent magnitude (V) | 10.88±0.07 |
| Characteristics | |
| Evolutionary stage | pre-main sequence |
| Spectral type | K1Ve |
| Astrometry | |
| Proper motion (μ) | RA: −34.025 mas/yr Dec.: +2.319 mas/yr |
| Parallax (π) | 9.1537±0.0118 mas |
| Distance | 356.3 ± 0.5 ly (109.2 ± 0.1 pc) |
| Details | |
| Mass | 1.10±0.03 M☉ |
| Radius | 1.193±0.022 R☉ |
| Luminosity | 0.65 L☉ |
| Surface gravity (log g) | 3.9 cgs |
| Temperature | 4,749±40 K |
| Rotation | 2.7325 days |
| Rotational velocity (v sin i) | 19.3±0.5 km/s |
| Age | 13.9±2.3 Myr |
| Other designations | |
| TIC 295777692, TYC 8984-2245-1 | |
| Database references | |
| SIMBAD | data |
YSES 2 is a young, Sun-like (K-type) star in the constellation of Musca. It is approximately 360 ly from Earth in the Scorpius-Centaurus Association. Its age is 14 million years.
The star was believed to be orbited by the exoplanet YSES 2b, a supposed super-jovian gas giant with 6.3+1.6
−0.9 times the mass of Jupiter that had an estimated separation of 114 AU. It was discovered through direct imaging by Bohn et al. in 2021, but in 2025 was determined to be a background red dwarf star and not a planet.
References
- ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
- 1 2 3 4 5 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ↑ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355. Bibcode:2000A&A...355L..27H.
- 1 2 3 Bohn, Alexander J.; Ginski, Christian; Kenworthy, Matthew A.; Mamajek, Eric E.; Pecaut, Mark J.; Mugrauer, Markus; Vogt, Nikolaus; Adam, Christian; Meshkat, Tiffany; Reggiani, Maddalena; Snik, Frans (2021-04-01). "Discovery of a directly imaged planet to the young solar analog YSES 2". Astronomy & Astrophysics. 648: A73. arXiv:2104.08285. Bibcode:2021A&A...648A..73B. doi:10.1051/0004-6361/202140508. ISSN 0004-6361.
- ↑ Torres, C. A. O.; Quast, G. R.; Da Silva, L.; de la Reza, R.; Melo, C. H. F.; Sterzik, M. (2006). "Search for associations containing young stars (SACY). I. Sample and searching method". Astronomy and Astrophysics. 460 (3): 695. arXiv:astro-ph/0609258. Bibcode:2006A&A...460..695T. doi:10.1051/0004-6361:20065602.
- 1 2 "Astronomers photograph giant exoplanet in unusual large orbit". earthsky.org. 2021-05-11. Retrieved 2021-06-22.
- ↑ "Giant planet at large distance from sun-like star puzzles astronomers - Astronomie.nl". www.astronomie.nl (in Dutch). Retrieved 2021-07-17.
- ↑ "Exoplanet-catalog". Exoplanet Exploration: Planets Beyond our Solar System. 3 June 2021. Retrieved 2021-06-22.
- ↑ Kenworthy, Matthew; Stolker, Tomas; Kammerer, Jens; Balmer, William; Vigan, Arthur; Lacour, Sylvestre; Otten, Gilles; Mamajek, Eric; Ginski, Christian; Nowak, Mathias; Martos, Steven; Wang, Jason; Rickman, Emily; Janson, Markus; Bohn, Alexander (2025-08-14). "YSES 2b is a background star. Differential astrometric M-dwarf measurements in time". Astronomy & Astrophysics. 701. arXiv:2509.09504. Bibcode:2025A&A...701A.104K. doi:10.1051/0004-6361/202556170. ISSN 0004-6361.
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