YBP 1194
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cancer
Right ascension 08h 51m 00.807s[1]
Declination +11° 48′ 52.76″[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: -7.3[2] mas/yr
Dec.: -4.3[2] mas/yr
Parallax (π)1.1164 ± 0.0369 mas[5]
Distance2,920 ± 100 ly
(900 ± 30 pc)
Details
Mass1.01 ± 0.02[3] M☉
Radius0.99 ± 0.02[3] R☉
Surface gravity (log g)4.44 ± 0.035[3] cgs
Temperature5780 ± 27[3] K
Metallicity0.023 ± 0.015[3]
Age4.2 ± 1.6[6] Gyr
Other designations
NGC 2682 YBP 1194, ES 4063, ES IV-63, FBC 2867, MMJ 5357, SAND 770, 2MASS J08510080+1148527, Gaia DR2 604914949295282816
Database references
SIMBADdata

YBP 1194 is a G-type main-sequence star, class G5V, in the open cluster M67 in the constellation Cancer.[7][8] It is the best solar twin found to date, having the near exact temperature and mass as the Sun. YBP 1194 has a higher metallicity than the Sun and is 0.5 billion years younger at an age of 4.2 billion years old, but due to the distance, the error bar is high at ±1.6 billion years. On December 19, 2013, it was announced to have an extrasolar planet with a period of 6.9 days and a high eccentricity of 0.24 with a mass of 0.34 MJ.[8] It is about 2,772 light-years (850 parsecs) from the Sun.[3][9] It is packed in a small cluster, Messier 67, with a radius of 10 ly, with over 500 other stars.[10] For comparison, the Sun has 17 stars at a distance of 10 ly and about 134 stars at a distance of 20 ly.[11][12]

Planetary system

Exoplanet YBP 1194 b was discovered in January 2014 by researchers at the European Southern Observatory (ESO) when three new planets were discovered in the M67 cluster, one of them orbiting YPB 1194, showing that open star clusters are more likely to have planets orbiting them than originally thought. The exoplanet is prominently about 100 times more massive than Earth. Exoplanet YBP 1194 b when compared to the Sun-Earth system, orbits the star at about 87 million miles, closer than the planet Mercury. The orbital eccentricity of YPB 1194 b is 0.24, close to Pluto's eccentricity of 0.24905.[8][13] The composition of these planets is currently unknown.[8][14]

The YBP 1194 planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 0.34 MJ 0.0716 6.9 0.24 — —

References

  1. 1 2 Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues. 2246: II/246. Bibcode:2003yCat.2246....0C.
  2. 1 2 3 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.
  3. 1 2 3 4 5 6 7 8 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.
  4. ↑ 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.
  5. ↑ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  6. ↑ "Confirmed Exoplanet Overview". exoplanetarchive. Retrieved 4 March 2016.
  7. ↑ "Cl* NGC 2682 YBP 1194". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 4 March 2014.
  8. 1 2 3 4 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.
  9. ↑ Department of Physics and Astronomy, Division of AstronomyUppsala University, M67-1194, an unusually Sun-like solar twin in M67, by A. Önehag1, A. Korn1, B. Gustafsson1, E. Stempels1 and D. A. VandenBerg2, April 2011
  10. ↑ M67 Cluster
  11. ↑ Sol Station Company, Stars Stars within 10 light-years
  12. ↑ Sol Station Company, Stars Stars within 20 light-years
  13. ↑ "Rare Planet Discovered Orbiting Twin of Earth's Sun in Star Cluster". January 15, 2014. Retrieved March 4, 2014.
  14. ↑ exoplanets.org, M 67 YBP 1194 b
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