YBP 1194 is a G-type main-sequence star, class G5V, in the open cluster Messier 67, about 2,890 light-years (890 parsecs) from the Sun in the constellation Cancer.[6][7] It is a solar twin, having the near exact same temperature and mass as the Sun.[8] YBP 1194 has a slightly higher metallicity than the Sun, and may be slightly younger at an age of 3.5-4.8 billion years.[3] In January 2014, this star was announced to have an exoplanet.[7][3]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 51m 00.80527s[1] |
| Declination | +11° 48′ 52.7956″[1] |
| Apparent magnitude (V) | 14.676[2] |
| Characteristics | |
| Spectral type | G5V[3] |
| B−V color index | 0.626[3] |
| Astrometry | |
| Radial velocity (Rv) | +36.5 ± 0.9[4] km/s |
| Proper motion (μ) | RA: -10.813 mas/yr[1] Dec.: -2.732 mas/yr[1] |
| Parallax (π) | 1.1297 ± 0.0242 mas[1] |
| Distance | 2,890 ± 60 ly (890 ± 20 pc) |
| Details[3] | |
| Mass | 1.01±0.02 M☉ |
| Radius | 0.99±0.02 R☉ |
| Surface gravity (log g) | 4.44±0.035 cgs |
| Temperature | 5780±27 K |
| Metallicity [Fe/H] | 0.023±0.015 dex |
| Age | 4.15±0.65[5] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This system is packed in a small cluster, Messier 67, with a radius of 10 light-years, with over 500 other stars.[9] For comparison, the Sun has 9 star systems within 10 light-years and 94 star systems within 20 light-years.[10]
Planetary system
editThe exoplanet YBP 1194 b was discovered in January 2014 by researchers at the European Southern Observatory (ESO) as one of three new planets discovered in the M67 cluster, showing that open star clusters are more likely to have planets in them than previously thought.[7][3] The exoplanet is about 100 times more massive than Earth, comparable in mass to Saturn. YBP 1194 b orbits its star with a 7-day period at a distance of 0.07 AU, closer than the planet Mercury is to the Sun. The combination of its large mass and close orbit makes this planet a hot Jupiter. The orbital eccentricity of YPB 1194 b is about 0.3, greater than Pluto's eccentricity of 0.25.[11]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥0.33±0.03 MJ | 0.0716 | 6.960±0.001 | 0.31±0.08 | — | — |
References
edit- ^ 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.
- ^ Krone-Martins, A.; Soubiran, C.; Ducourant, C.; Teixeira, R.; Le Campion, J. F. (2010). "Kinematic parameters and membership probabilities of open clusters in the Bordeaux PM2000 catalogue". Astronomy and Astrophysics. 516: A3. arXiv:1006.0096. Bibcode:2010A&A...516A...3K. doi:10.1051/0004-6361/200913881. S2CID 119252831.
- ^ a b c d e f Brucalassi, A.; Pasquini, L.; Saglia, R.; et al. (2014). "Three planetary companions around M 67 stars". Astronomy & Astrophysics. 561: L9. arXiv:1401.4905. Bibcode:2014A&A...561L...9B. doi:10.1051/0004-6361/201322584. S2CID 36895080.
- ^ Lee, Young Sun; Beers, Timothy C.; Sivarani, Thirupathi; Johnson, Jennifer A.; An, Deokkeun; Wilhelm, Ronald; Allende Prieto, Carlos; Koesterke, Lars; Fiorentin, Paola Re; Bailer-Jones, Coryn A. L.; Norris, John E.; Yanny, Brian; Rockosi, Constance; Newberg, Heidi J.; Cudworth, Kyle M.; Pan, Kaike (2008). "The Segue Stellar Parameter Pipeline. Ii. Validation with Galactic Globular and Open Clusters". The Astronomical Journal. 136 (5): 2050–2069. arXiv:0710.5778. Bibcode:2008AJ....136.2050L. doi:10.1088/0004-6256/136/5/2050. S2CID 119247147.
- ^ "Confirmed Exoplanet Overview". exoplanetarchive. Retrieved 4 March 2016.
- ^ a b "Cl* NGC 2682 YBP 1194". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 4 March 2014.
- ^ a b c David Dickinson (January 15, 2014). "New exoplanet discoveries in open star cluster". Postmedia News. Archived from the original on February 20, 2014. Retrieved March 4, 2014.
- ^ A. Önehag; A. Korn; B. Gustafsson; E. Stempels; D. A. VandenBerg (2011). "M67-1194, an unusually Sun-like solar twin in M67". Astronomy and Astrophysics. 528: A85. arXiv:1009.4579. Bibcode:2011A&A...528A..85O. doi:10.1051/0004-6361/201015138. S2CID 119116626.
- ^ M67 Cluster
- ^ Reylé, Céline; Jardine, Kevin; Fouqué, Pascal; Caballero, Jose A.; Smart, Richard L.; Sozzetti, Alessandro (30 April 2021). "The 10 parsec sample in the Gaia era". Astronomy & Astrophysics. 650: A201. arXiv:2104.14972. Bibcode:2021A&A...650A.201R. doi:10.1051/0004-6361/202140985. S2CID 233476431. Data available at https://gruze.org/10pc/
- ^ a b Brucalassi, A.; Koppenhoefer, J.; et al. (July 2017). "Search for giant planets in M 67. IV. Survey results". Astronomy & Astrophysics. 603: A85. arXiv:1703.04296. Bibcode:2017A&A...603A..85B. doi:10.1051/0004-6361/201527562.