HD 196050

HD 196050

Observation data Epoch J2000      Equinox J2000
Constellation	Pavo
Right ascension	20^h 37^m 51.70984^s[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) mas/yr[1] Dec.: −65.020(15) mas/yr[1]
Parallax (π)	19.7872 ± 0.0205 mas[1]
Distance	164.8 ± 0.2 ly (50.54 ± 0.05 pc)
Absolute magnitude (MV)	4.01[2]
Details[5]
A
Mass	1.18±0.02[6] M☉
Radius	1.46+0.02 −0.03 R☉
Luminosity	2.213+0.007 −0.006[6] L☉
Surface gravity (log g)	4.32 cgs
Temperature	5,834+55 −52[6] K
Metallicity [Fe/H]	0.34±0.06 dex
Rotation	16.0 d[7]
Rotational velocity (v sin i)	3.0 km/s
Age	2.5±1.3 Gyr
Other designations
CPD−61° 6497, HD 196050, HIP 101806, SAO 254837, PPM 364690, WDS J20379-6038AB[8]
Database references
SIMBAD	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 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

• HD 190228
• HD 195019
• List of extrasolar planets

References

1. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
2. Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
3. Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920, retrieved 2015-07-22
4. Houk, Nancy (1979). Michigan catalogue of two-dimensional spectral types for the HD stars. Vol. 1. Ann Arbor, Michigan: Department of Astronomy, University of Michigan. Bibcode:1978mcts.book.....H.
5. 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. arXiv:1905.12066. Bibcode:2019MNRAS.487.3162C. doi:10.1093/mnras/stz1496. S2CID 168169634.
6. 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.
7. 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. arXiv:astro-ph/0310316. Bibcode:2004A&A...415..391M. doi:10.1051/0004-6361:20034250. S2CID 5233877.
8. "HD 196050". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-25.
9. Mugrauer, M.; et al. (2005). "Four new wide binaries among exoplanet host stars". Astronomy and Astrophysics. 440 (3): 1051–1060. arXiv:astro-ph/0507101. Bibcode:2005A&A...440.1051M. doi:10.1051/0004-6361:20042297. S2CID 14065040.
10. Roell, T.; et al. (June 2012). "Extrasolar planets in stellar multiple systems". Astronomy & Astrophysics. 542: 10. arXiv:1204.4833. Bibcode:2012A&A...542A..92R. doi:10.1051/0004-6361/201118051. S2CID 55755453. A92.
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. arXiv:astro-ph/0206216. Bibcode:2002MNRAS.337.1170J. doi:10.1046/j.1365-8711.2002.05787.x. S2CID 119520409.
12. Xiao, Guang-Yao; Liu, Yu-Juan; et al. (May 2023). "The Masses of a Sample of Radial-Velocity Exoplanets with Astrometric Measurements". Research in Astronomy and Astrophysics. 23 (5): 055022. arXiv:2303.12409. Bibcode:2023RAA....23e5022X. doi:10.1088/1674-4527/accb7e.

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.