HD 196050
Triple star system in the constellation Pavo
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HD 196050 is a triple star[10][4] system located in the southern constellation of Pavo. This system has an apparent magnitude of 7.50[3] and the absolute magnitude is 4.01.[3] 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.[2] It is also called by the Hipparcos designation HIP 101806.
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Pavo[1] |
| Right ascension | 20h 37m 51.70984s[2] |
| Declination | −60° 38′ 04.1460″[2] |
| Apparent magnitude (V) | 7.50[3] + 10.62[4] + 15.6[4] |
| Characteristics | |
| Spectral type | G3V[5] + M1.5-M4.5 + M2.5-M5.5[4] |
| B−V color index | 0.667±0.010[3] |
| Astrometry | |
| Radial velocity (Rv) | +61.37±0.12[2] km/s |
| Proper motion (μ) | RA: −191.118(14) mas/yr[2] Dec.: −65.020(15) mas/yr[2] |
| Parallax (π) | 19.7872±0.0205 mas[2] |
| Distance | 164.8 ± 0.2 ly (50.54 ± 0.05 pc) |
| Absolute magnitude (MV) | 4.01[3] |
| Details[6] | |
| A | |
| Mass | 1.18±0.02[7] M☉ |
| Radius | 1.46+0.02 −0.03 R☉ |
| Luminosity | 2.213+0.007 −0.006[7] L☉ |
| Surface gravity (log g) | 4.32 cgs |
| Temperature | 5,834+55 −52[7] K |
| Metallicity [Fe/H] | 0.34±0.06 dex |
| Rotation | 16.0 d[8] |
| 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[9] | |
| Database references | |
| SIMBAD | data |
Characteristics
The primary component is a G-type main-sequence star with a stellar classification of G3V.[5] It has a quiescent chromosphere and does not appear to be variable.[10] The star has 18%[7] 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.[6] The star is radiating 2.21[7] times the luminosity of the Sun from its photosphere at an effective temperature of 5,834 K.[7]
A faint co-moving companion star, designated component B, was detected based on observations during 2003–2004,[10] located 10.80″[4] to the south of the primary component. This corresponds to a projected separation of 7,511±22 AU.[10] The star is magnitude 10.62[4] A third companion, component C, was discovered in 2007, located about 0.4″ from component B.[11] It has a visual magnitude of 15.6.[4]
Planetary system
In 2002, the Anglo-Australian Planet Search team announced the discovery of an extrasolar planet orbiting the star.[12] The discovery was independently confirmed by the Geneva Extrasolar Planet Search team.[8] In 2023, the inclination and true mass of HD 196050 b were determined via astrometry.[13]
| 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 |
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