HD 133131

HD 133131 is a binary star in the constellation of Libra. It is roughly 153 light-years (47 parsecs) away from the Sun.[2] It consists of two G-type main-sequence stars;[2] neither are bright enough to be seen with the naked eye.

HD 133131
Observation data
Epoch J2000      Equinox J2000
Constellation Libra
Right ascension  15h 03m 35.80651s[1]
Declination −27° 50′ 27.5520″[1]
Apparent magnitude (V) 8.40 + 8.42[2]
Characteristics
Spectral type G2 + G2[2]
Astrometry
Distance153 ly
(47[2] pc)
Orbit[2]
Period (P)∼4240 yr
Details[2]
HD 133131 A
Mass0.95 M☉
Surface gravity (log g)4.39 ± 0.050 cgs
Temperature5799 ± 19 K
Metallicity [Fe/H]−0.306 ± 0.016 dex
Age9.7 Gyr
HD 133131 B
Mass0.93 M☉
Surface gravity (log g)4.41 ± 0.045 cgs
Temperature5805 ± 15 K
Age9.7 Gyr
Other designations
CPD−27° 5116, HD 133131, HIP 73674[3]
HD 133131 A: SAO 183128[4]
HD 133131 B: SAO 183129[5]
Database references
SIMBADHD 133131
HD 133131 A
HD 133131 B

Both components, HD 133131 A and B, are very similar to the Sun but are far older, 9.7 billion years old. They also have very low metallicities. It therefore came as a surprise that HD 133131 A is orbited by two gas giants, and HD 133131 B by another.[2]

The HD 133131 A planetary system[2]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b ≥1.43 MJ 1.44 649 0.32 — —
c ≥0.63 MJ 4.79 3925 0.20 — —
The HD 133131 B planetary system[2]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b ≥2.50 MJ 6.40 6119 0.62 — —

References
  1. van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  2. Teske, Johanna K; Shectman, Stephen A; Vogt, Steve S; Díaz, Matías; Butler, R. Paul; Crane, Jeffrey D; Thompson, Ian B; Arriagada, Pamela (2016). "The Magellan PFS Planet Search Program: Radial Velocity and Stellar Abundance Analyses of the 360 AU, Metal-Poor Binary "Twins" HD 133131A & B". The Astronomical Journal. 152 (6): 167. arXiv:1608.06216. Bibcode:2016AJ....152..167T. doi:10.3847/0004-6256/152/6/167.
  3. "HD 133131". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 23 August 2018.
  4. "HD 133131A". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 23 August 2018.
  5. "HD 133131B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 23 August 2018.


This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.