Astronomy:HD 196050

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Short description: Triple star system in the constellation Pavo
HD 196050
Observation data
Equinox J2000.0]] (ICRS)
Constellation Pavo
Right ascension  20h 37m 51.70984s[1]
Declination −60° 38′ 04.1460″[1]
Apparent magnitude (V) 7.50[2] + 10.62[3] + 15.6[3]
Characteristics
Spectral type G3V[4] + M1.5-M4.5 + M2.5-M5.5[3]
B−V color index 0.667±0.010[2]
Astrometry
Radial velocity (Rv)+61.37±0.12[1] km/s
Proper motion (μ) RA: −191.118(14)[1] mas/yr
Dec.: −65.020(15)[1] mas/yr
Parallax (π)19.7872 ± 0.0205[1] mas
Distance164.8 ± 0.2 ly
(50.54 ± 0.05 pc)
Absolute magnitude (MV)4.01[2]
Details[5]
A
Mass1.18±0.02[6] M☉
Radius1.46+0.02
−0.03 R☉
Luminosity2.213+0.007
−0.006[6] L☉
Surface gravity (log g)4.32 cgs
Temperature5,834+55
−52[6] K
Metallicity [Fe/H]0.34±0.06 dex
Rotation16.0 d[7]
Rotational velocity (v sin i)3.0 km/s
Age2.5±1.3 Gyr
Other designations
CPD−61° 6497, HD 196050, HIP 101806, SAO 254837, PPM 364690, WDS J20379-6038AB[8]
Database references
SIMBADdata
Extrasolar Planets
Encyclopaedia		data

HD 196050 is a triple star[9][3] system located in the southern constellation of Pavo. This system has an apparent magnitude of 7.50[2] and the absolute magnitude is 4.01.[2] It is located at a distance of 165 light-years (51 parsecs) from the Sun based on parallax, and is drifting further away with a radial velocity of +61 km/s.[1] It is also called by the Hipparcos designation HIP 101806.

Characteristics

The primary component is a G-type main-sequence star with a stellar classification of G3V.[4] It has a quiescent chromosphere and does not appear to be variable.[9] The star has 18%[6] more mass than the Sun and a 46% greater size. It is around 2.5 billion years old with a higher than solar metallicity, and is spinning with a projected rotational velocity of 3 km/s.[5] The star is radiating 2.21[6] times the luminosity of the Sun from its photosphere at an effective temperature of 5,834 K.[6]

A faint co-moving companion star, designated component B, was detected based on observations during 2003–2004,[9] located 10.80″[3] to the south of the primary component. This corresponds to a projected separation of 7,511±22 astronomical unit|AU.[9] The star is magnitude 10.62[3] A third companion, component C, was discovered in 2007, located about 0.4″ from component B.[10] It has a visual magnitude of 15.6.[3]

Planetary system

In 2002, the Anglo-Australian Planet Search team announced the discovery of an extrasolar planet orbiting the star.[11] The discovery was independently confirmed by the Geneva Extrasolar Planet Search team.[7] In 2023, the inclination and true mass of HD 196050 b were determined via astrometry.[12]

The HD 196050 planetary system[12]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(years) 		Eccentricity Inclination Radius
b 4.55+0.69
−0.72 MJ 		2.585+0.032
−0.035 		3.813+0.026
−0.024 		0.178±0.011 41.0+10.0
−6.3 or 139.0+6.3
−10.0° 		—

See also

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 Mason, B. D. et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal 122 (6): 3466, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M, http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=B/wds, retrieved 2015-07-22 
  4. ↑ 4.0 4.1 Houk, Nancy (1979). Michigan catalogue of two-dimensional spectral types for the HD stars. 1. Ann Arbor, Michigan: Department of Astronomy, University of Michigan. Bibcode: 1978mcts.book.....H. 
  5. ↑ 5.0 5.1 Chavero, C. et al. (August 2019). "Emerging trends in metallicity and lithium properties of debris disc stars". Monthly Notices of the Royal Astronomical Society 487 (3, p.3162-3177): 3162–3177. doi:10.1093/mnras/stz1496. Bibcode: 2019MNRAS.487.3162C. 
  6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 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. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  7. ↑ 7.0 7.1 Mayor, M. et al. (2004). "The CORALIE survey for southern extra-solar planets XII. Orbital solutions for 16 extra-solar planets discovered with CORALIE". Astronomy and Astrophysics 415 (1): 391–402. doi:10.1051/0004-6361:20034250. Bibcode: 2004A&A...415..391M. 
  8. ↑ "HD 196050". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+196050. 
  9. ↑ 9.0 9.1 9.2 9.3 Mugrauer, M. et al. (2005). "Four new wide binaries among exoplanet host stars". Astronomy and Astrophysics 440 (3): 1051–1060. doi:10.1051/0004-6361:20042297. Bibcode: 2005A&A...440.1051M. 
  10. ↑ Roell, T. et al. (June 2012). "Extrasolar planets in stellar multiple systems". Astronomy & Astrophysics 542: 10. doi:10.1051/0004-6361/201118051. A92. Bibcode: 2012A&A...542A..92R. 
  11. ↑ Jones, Hugh R. A. et al. (December 2002). "Extrasolar planets around HD 196050, HD 216437 and HD 160691". Monthly Notices of the Royal Astronomical Society 337 (4): 1170–1178. doi:10.1046/j.1365-8711.2002.05787.x. Bibcode: 2002MNRAS.337.1170J. 
  12. ↑ 12.0 12.1 Xiao, Guang-Yao et al. (May 2023). "The Masses of a Sample of Radial-Velocity Exoplanets with Astrometric Measurements". Research in Astronomy and Astrophysics 23 (5): 055022. doi:10.1088/1674-4527/accb7e. Bibcode: 2023RAA....23e5022X. 

Further reading

  • Greenhill, L. et al. (2002). "epsilon Eridani, upsilon Andromedae, 51 Pegasi, HD 209458, HD 196050". IAU Circular 7985: 1. Bibcode: 2002IAUC.7985....1G. 

Coordinates: Sky map 20h 37m 51.7098s, −60° 38′ 04.147″



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