Astronomy:HD 125595

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Short description: Star in the constellation Centaurus
HD 125595
Observation data
Equinox J2000.0]] (ICRS)
Constellation Centaurus
Right ascension  14h 21m 23.186s[1]
Declination −40° 23′ 38.22″[1]
Apparent magnitude (V) 9.03[2]
Characteristics
Evolutionary stage Main sequence
Spectral type K4V(k)[3]
Apparent magnitude (B) 10.137[2]
Apparent magnitude (J) 7.097±0.021[2]
Apparent magnitude (H) 6.608±0.026[2]
Apparent magnitude (K) 6.447±0.023[2]
B−V color index 1.107±0.006[2]
Astrometry
Radial velocity (Rv)+4.48±0.45[1] km/s
Proper motion (μ) RA: −561.636[1] mas/yr
Dec.: −68.516[1] mas/yr
Parallax (π)35.4337 ± 0.0762[1] mas
Distance92.0 ± 0.2 ly
(28.22 ± 0.06 pc)
Absolute magnitude (MV)6.80[2]
Details
Mass0.77[4] M
Radius0.73+0.02
−0.03
[1] R
Luminosity0.241[1] L
Surface gravity (log g)4.58[4] cgs
Temperature4,672[4] K
Metallicity [Fe/H]0.13[4] dex
Rotation37.2±2.0 d[5]
Rotational velocity (v sin i)1.50[6] km/s
Age8.17[4] Gyr
Other designations
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia
data

HD 125595 is a star with a close Neptunian[6] companion in the southern constellation of Centaurus. With an apparent visual magnitude of 9.03,[2] this star is too faint to be viewed with the naked eye. It is located at a distance of 92 light years from the Sun based on parallax measurements, and is drifting further away with a radial velocity of +4.5 km/s.[1] The star has a high proper motion, traversing the celestial sphere and an angular rate of 0.57 arcsecond yr−1.[7]

This is an ordinary K-type main-sequence star with a stellar classification of K4V(k),[3] which indicates it is a small star that is generating energy at its core through hydrogen fusion. It is about eight[4] billion years old and is spinning with a projected rotational velocity of 1.5 km/s,[6] giving it a 37 day rotation period.[5] The star shows a moderate level of chromospherically activity due to star spots or plagues.[6] It is smaller, cooler, dimmer, and less massive than the Sun, but shows a higher atmospheric metallicity.[4]

Planetary system

In 2018 an exoplanet companion was announced by the HARPS program, using the radial velocity method. It is a Neptune-mass object orbiting 0.081 astronomical unit|AU (12.1 Gm) from the host star with a period of 9.7 days.[6]

The HD 125595 planetary system[6]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b ≥ 0.042±0.004 MJ 0.0809±0.0014 9.6737±0.0039 0.0

See also

  • List of extrasolar planets

References

  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  2. 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode2012AstL...38..331A. 
  3. 3.0 3.1 Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (2006-07-01). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc-The Southern Sample". The Astronomical Journal 132 (1): 161–170. doi:10.1086/504637. ISSN 0004-6256. Bibcode2006AJ....132..161G. 
  4. 4.0 4.1 4.2 4.3 4.4 4.5 4.6 Luck, R. Earle (March 2018). "Abundances in the Local Region. III. Southern F, G, and K Dwarfs". The Astronomical Journal 155 (3): 31. doi:10.3847/1538-3881/aaa9b5. 111. Bibcode2018AJ....155..111L. 
  5. 5.0 5.1 Suárez Mascareño, A. et al. (September 2015). "Rotation periods of late-type dwarf stars from time series high-resolution spectroscopy of chromospheric indicators". Monthly Notices of the Royal Astronomical Society 452 (3): 2745–2756. doi:10.1093/mnras/stv1441. Bibcode2015MNRAS.452.2745S. 
  6. 6.0 6.1 6.2 6.3 6.4 6.5 Ségransan, D. et al. (2011). "The HARPS search for southern extra-solar planets. XXIX. Four new planets in orbit around the moderately active dwarfs HD 63765, HD 104067, HD 125595, and HIP 70849". Astronomy and Astrophysics 535: A54. doi:10.1051/0004-6361/200913580. Bibcode2011A&A...535A..54S. http://www.aanda.org/articles/aa/full_html/2011/11/aa13580-09/aa13580-09.html. 
  7. Bakos, Gáspár Á. et al. (July 2002). "Revised Coordinates and Proper Motions of the Stars in the Luyten Half-Second Catalog". The Astrophysical Journal Supplement Series 141 (1): 187–193. doi:10.1086/340115. Bibcode2002ApJS..141..187B. 

Coordinates: Sky map 14h 21m 23.1859s, −40° 23′ 38.211″