Astronomy:HD 130322

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Short description: Star in the constellation Virgo
HD 130322 / Mönch
Observation data
Equinox J2000.0]] (ICRS)
Constellation Virgo[1]
Right ascension  14h 47m 32.7262s[2]
Declination −00° 16′ 53.308″[2]
Apparent magnitude (V) 8.04[1]
Characteristics
Spectral type K0V[3]
B−V color index 0.781±0.002[1]
Astrometry
Radial velocity (Rv)−12.388±0.0005[4] km/s
Proper motion (μ) RA: −130.476(25)[2] mas/yr
Dec.: −140.246(25)[2] mas/yr
Parallax (π)31.3356 ± 0.0262[2] mas
Distance104.08 ± 0.09 ly
(31.91 ± 0.03 pc)
Absolute magnitude (MV)5.54[1]
Details[5]
Mass0.92±0.03 M☉
Radius0.85±0.04 R☉
Luminosity0.62[1] L☉
Surface gravity (log g)4.52±0.06 cgs
Temperature5,387±44 K
Metallicity [Fe/H]−0.02[6] dex
Rotation26.53±0.70 d
Rotational velocity (v sin i)0.5±0.5 km/s
Age6.1±2.9[7] Gyr
Other designations
BD+00 3243, HD 130322, HIP 72339, LTT 5873, NLTT 38386[8]
Database references
SIMBADThe star
planet b
Exoplanet Archivedata

HD 130322 is a star with a close orbiting exoplanet in the constellation of Virgo. The distance to this system is 104 light years, as determined using parallax measurements. It is drifting closer to the Sun with a radial velocity of −12.4 km/s.[4] With an apparent visual magnitude of 8.04,[1] it is too dim to be visible to the naked eye; requiring binoculars or a small telescope to view. Being almost exactly on the celestial equator the star is visible everywhere in the world except for the North Pole. The star shows a high proper motion, traversing the celestial sphere at an angular rate of 0.197 arcsec yr−1.[9]

The spectrum of this star presents as a K-type main-sequence star, an orange dwarf, with a stellar classification of K0V.[3] The star has 92% of the mass of the Sun and 85% of the Sun's radius. It is spinning with a rotation period of 26.5 days.[5] HD 130322 is radiating 62%[1] of the luminosity of the Sun from its photosphere at an effective temperature of 5,387 K.[5] It is estimated to be around six billion years old.[7]

The star HD 130322 is named Mönch and its companion is Eiger. The names were selected in the NameExoWorlds campaign by Switzerland , during the 100th anniversary of the IAU. Mönch and Eiger are prominent peaks of the Bernese Alps.[10][11]

Planetary system

In 2000, an extrasolar planet was discovered orbiting the star using Doppler spectroscopy. As the inclination of the orbital plane is unknown, only a lower bound on the mass can be estimated. Most likely this is a hot Jupiter as it is orbiting close to the host star and has at least the mass of Jupiter.[6]

The star rotates at an inclination of 76+14−42 degrees relative to Earth.[12] It has been assumed that the planet shares that inclination.[13] But several "hot Jupiters" are known to be oblique relative to the stellar axis.[14]

The HD 130322 planetary system[5][15]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b (Eiger) >1.089 ± 0.98 MJ 0.0910 ± 0.053 10.70871±0.00018 0.029±0.016 — —

See also

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
  2. ↑ 2.0 2.1 2.2 2.3 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.
  3. ↑ 3.0 3.1 Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars". Michigan Spectral Survey 5. Bibcode: 1999MSS...C05....0H. 
  4. ↑ 4.0 4.1 Soubiran, C. et al. (2018). "Gaia Data Release 2. The catalogue of radial velocity standard stars". Astronomy and Astrophysics 616: A7. doi:10.1051/0004-6361/201832795. Bibcode: 2018A&A...616A...7S. 
  5. ↑ 5.0 5.1 5.2 5.3 Hinkel, Natalie R. et al. (2015). "Refined Properties of the Hd 130322 Planetary System". The Astrophysical Journal 803 (1). doi:10.1088/0004-637X/803/1/8. Bibcode: 2015ApJ...803....8H. 
  6. ↑ 6.0 6.1 Udry, S. et al. (2000). "The CORALIE survey for southern extra-solar planets II. The short-period planetary companions to HD 75289 and HD 130322". Astronomy and Astrophysics 356 (2): 590–598. Bibcode: 2000A&A...356..590U. http://aa.springer.de/papers/0356002/2300590/small.htm. 
  7. ↑ 7.0 7.1 Bonfanti, A. et al. (2016). "Age consistency between exoplanet hosts and field stars". Astronomy & Astrophysics 585: 14. doi:10.1051/0004-6361/201527297. A5. Bibcode: 2016A&A...585A...5B. 
  8. ↑ "HD 130322". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+130322. 
  9. ↑ Luyten, W. J. (June 1995). "VizieR Online Data Catalog: NLTT Catalogue (Luyten, 1979)". VizieR Online Data Catalog. Bibcode: 1995yCat.1098....0L. 
  10. ↑ "Approved names" (in en). http://www.nameexoworlds.iau.org/final-results. 
  11. ↑ "International Astronomical Union | IAU". https://www.iau.org/news/pressreleases/detail/iau1912/. 
  12. ↑ Simpson, E. K. et al. (November 2010), "Rotation periods of exoplanet host stars", Monthly Notices of the Royal Astronomical Society 408 (3): 1666–1679, doi:10.1111/j.1365-2966.2010.17230.x, Bibcode: 2010MNRAS.408.1666S 
  13. ↑ "hd_130322_b". Extrasolar Planets Encyclopaedia. https://exoplanet.eu/catalog/hd_130322_b--21/. 
  14. ↑ Sanchis-Ojeda, Roberto et al. (2012). "Starspots and spin-orbit alignment for Kepler cool host stars". Astronomische Nachrichten 334 (1–2): 180–183. doi:10.1002/asna.201211765. Bibcode: 2013AN....334..180S. 
  15. ↑ Butler, R. P. et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal 646 (1): 505–522. doi:10.1086/504701. Bibcode: 2006ApJ...646..505B. 

Coordinates: Sky map 14h 47m 32.7269s, −00° 16′ 53.314″



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