YSES 2

For other uses, see YSES.
YSES 2
Observation data
Epoch J2000      Equinox ICRS
Constellation Musca[1]
Right ascension 11h 27m 55.35s[2]
Declination −66° 26′ 04.5″[2]
Apparent magnitude (V) 10.88±0.07[3]
Characteristics
Evolutionary stage pre-main sequence[4]
Spectral type K1Ve[5]
Astrometry
Proper motion (μ) RA: −34.025 mas/yr[2]
Dec.: +2.319 mas/yr[2]
Parallax (π)9.1537±0.0118 mas[2]
Distance356.3 ± 0.5 ly
(109.2 ± 0.1 pc)
Details[4]
Mass1.10±0.03 M☉
Radius1.193±0.022 R☉
Luminosity0.65 L☉
Surface gravity (log g)3.9 cgs
Temperature4,749±40 K
Rotation2.7325 days
Rotational velocity (v sin i)19.3±0.5 km/s
Age13.9±2.3 Myr
Other designations
TIC 295777692, TYC 8984-2245-1
Database references
SIMBADdata

YSES 2 is a young, Sun-like (K-type) star in the constellation of Musca.[6] It is approximately 360 ly from Earth in the Scorpius-Centaurus Association. Its age is 14 million years.[7]

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.[8][4] It was discovered through direct imaging by Bohn et al. in 2021,[6] but in 2025 was determined to be a background red dwarf star and not a planet.[9]

References

  1. ^ 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.
  2. ^ a b c d 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.
  3. ^ 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.
  4. ^ a b c 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.
  5. ^ 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.
  6. ^ a b "Astronomers photograph giant exoplanet in unusual large orbit". earthsky.org. 2021-05-11. Retrieved 2021-06-22.
  7. ^ "Giant planet at large distance from sun-like star puzzles astronomers - Astronomie.nl". www.astronomie.nl (in Dutch). Retrieved 2021-07-17.
  8. ^ "Exoplanet-catalog". Exoplanet Exploration: Planets Beyond our Solar System. 3 June 2021. Retrieved 2021-06-22.
  9. ^ 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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