TYC 8998-760-1

TYC 8998-760-1 is a young star, about 17 Ma old, located 310 light years away in the constellation of Musca, with a mass 1.00±0.02 times the Sun.

TYC 8998-760-1

TYC 8998-760-1, accompanied by two giant exoplanets, TYC 8998-760-1b and TYC 8998-760-1c[1]
Observation data
Epoch J2000[2]      Equinox J2000[2]
Constellation Musca
Right ascension  13h 25m 12.1261s[2]
Declination −64° 56′ 20.6882″[2]
Apparent magnitude (V) 11.19[3]
Characteristics
Evolutionary stage subgiant
Spectral type K3IV[2]
Astrometry
Radial velocity (Rv)12.84[4] km/s
Proper motion (μ) RA: -40.898[4] mas/yr
Dec.: -17.788[4] mas/yr
Parallax (π)10.5400 ± 0.0314[4] mas
Distance309.4 ± 0.9 ly
(94.9 ± 0.3 pc)
Details
Mass1.00[5] M☉
Radius0.95[4] R☉
Luminosity0.429[4] L☉
Temperature4,783[4] K
Age17[5] Myr
Database references
SIMBADdata

Estimated to be around 17 million years old, it is at the lower age limit of the G2V spectral type stars, and also the nearest Sun-analog example to the Solar System. The Sun is 4,500 Ma, 250 times older. All G2V stars have an estimated lifetime of ~10,000 Ma.

Planetary system

There are two giant exoplanets orbiting the star. The ESO Very Large Telescope photographed the two planets using its SPHERE instrument, producing the first direct image of multiple planets orbiting a Sun-like star.[1][6]

TYC 8998-760-1 b has a mass 14 times that of Jupiter, and a radius of 3 RJ. It orbits at a distance of 162 AU (2.42×1010 km; 1.51×1010 mi), or slightly more than 5 times the Neptune-Sun distance.[5][7]

TYC 8998-760-1 c has a mass of 6 MJ, and orbits at 320 AU (4.8×1010 km; 3.0×1010 mi), or slightly more than 11 times the Neptune-Sun distance.[5]

The TYC 8998-760-1 planetary system[5][8]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 14±3 MJ 162 — — — 3.0+0.2
−0.7 RJ
c 6±1 MJ 320 — — — 1.1+0.6
−0.3 RJ
gollark: It is not. *Anything* can be nil.
gollark: Also, it has nil. I mean, seriously.
gollark: The poor type system and general "make it mostly work" attitude leads to some amount of unsoundness in APIs.
gollark: Go is not focused on not messing up. They tend to mess up in exciting and bizarre ways.
gollark: yes.

References
  1. ESO/Bohn (22 July 2020). "First ever image of a multi-planet system around a Sun-like star (uncropped, with annotations)". ESO. European Space Agency. Archived from the original on 24 July 2020. Retrieved 24 July 2020.
  2. "TYC 8998-760-1". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 22 July 2020.
  3. Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
  4. 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.
  5. Bohn, Alexander (22 July 2020). "Two Directly Imaged, Wide-orbit Giant Planets around the Young, Solar Analog TYC 8998-760-1". The Astrophysical Journal Letters. 898 (1): L16. arXiv:2007.10991. Bibcode:2020ApJ...898L..16B. doi:10.3847/2041-8213/aba27e. S2CID 220686536.
  6. Wall, Mike (22 July 2020). "Multiplanet system around sunlike star photographed for 1st time ever - The two newly imaged planets are huge — 14 and 6 times more massive than Jupiter". Space.com. Retrieved 22 July 2020.
  7. "Astronomers Directly Image Two Giant Exoplanets around Young Sun-Like Star | Astronomy | Sci-News.com". Breaking Science News | Sci-News.com. Retrieved 2020-07-25.
  8. Planet TYC 8998-760-1 b at exoplanets.eu
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