Astronomy:YSES 2
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Short description: Star in the constellation Musca
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Musca[1] |
| Right ascension | Template:Ra[2] |
| Declination | −66° 26′ 04.5″[2] |
| Apparent magnitude (V) | 10.88±0.07[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | K1Ve[4] |
| Astrometry | |
| Proper motion (μ) | RA: −34.025[2] mas/yr Dec.: +2.319[2] mas/yr |
| Parallax (π) | 9.1537 ± 0.0118[2] mas |
| Distance | 356.3 ± 0.5 ly (109.2 ± 0.1 pc) |
| Details[5] | |
| 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 | |
TYC 8984-2245-1 | |
| Database references | |
| SIMBAD | data |
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][5] 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
- ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R Constellation record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 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. et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355. Bibcode: 2000A&A...355L..27H.
- ↑ 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. doi:10.1051/0004-6361:20065602. Bibcode: 2006A&A...460..695T.
- ↑ 5.0 5.1 Bohn, Alexander J.; Ginski, Christian; Kenworthy, Matthew A.; Mamajek, Eric E.; Pecaut, Mark J.; Mugrauer, Markus; Vogt, Nikolaus; Adam, Christian et al. (2021-04-01). "Discovery of a directly imaged planet to the young solar analog YSES 2" (in en). Astronomy & Astrophysics 648: A73. doi:10.1051/0004-6361/202140508. ISSN 0004-6361. Bibcode: 2021A&A...648A..73B.
- ↑ 6.0 6.1 "Astronomers photograph giant exoplanet in unusual large orbit" (in en-US). 2021-05-11. https://earthsky.org/space/giant-exoplanet-yses-2b-imaged-huge-orbit-sunlike-star/.
- ↑ "Giant planet at large distance from sun-like star puzzles astronomers - Astronomie.nl" (in nl). https://www.astronomie.nl/nieuws/en/giant-planet-at-large-distance-from-sun-like-star-puzzles-astronomers-2763.
- ↑ "Exoplanet-catalog". 3 June 2021. https://exoplanets.nasa.gov/exoplanet-catalog/7867/yses-2-b/.
- ↑ Kenworthy, Matthew; Stolker, Tomas; Kammerer, Jens; Balmer, William; Vigan, Arthur; Lacour, Sylvestre; Otten, Gilles; Mamajek, Eric et al. (2025-08-14). "YSES 2b is a background star. Differential astrometric M-dwarf measurements in time" (in en). Astronomy & Astrophysics 701. doi:10.1051/0004-6361/202556170. ISSN 0004-6361. Bibcode: 2025A&A...701A.104K.
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