HD 190984

Last updated
HD 190984
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Pavo
Right ascension 20h 11m 30.71538s [1]
Declination −64° 37′ 13.6853″ [1]
Apparent magnitude  (V)8.76 [2]
Characteristics
Spectral type F8 V [3]
U−B color index +0.02 [4]
B−V color index +0.54 [4]
Astrometry
Radial velocity (Rv)+20.48±0.14 [1]  km/s
Proper motion (μ)RA: +0.193  mas/yr [1]
Dec.: +45.355  mas/yr [1]
Parallax (π)6.7060 ± 0.0153  mas [1]
Distance 486 ± 1  ly
(149.1 ± 0.3  pc)
Absolute magnitude  (MV)+2.25 [5]
Details
Mass 1.15±0.01 [6]   M☉
Radius 2.31±0.09 [7]   R☉
Luminosity 5.88±1.01 [8]   L☉
Surface gravity (log g)3.78±0.03 [9]   cgs
Temperature 6,007±25 [9]   K
Metallicity −0.49±0.02 [9]
Rotational velocity (v sin i)5 [10]  km/s
Age 4.44±0.10 [6]   Gyr
Other designations
CD−64°1271, CPD−64°4030, HD  190984, HIP  99496, PPM  364454, 2MASS J20113069-6437136 [11]
Database references
SIMBAD data
Exoplanet Archive data

HD 190984, also known as HIP 99496, is a star located in the southern circumpolar constellation Pavo, the peacock. It has an apparent magnitude of 8.76, [2] making it readily visible in small telescopes, but not to the naked eye. Based on parallax measurements from the Gaia spacecraft, the object is estimated to be 486 light years away from the Solar System. [1] It appears to be receding with a heliocentric radial velocity of 20.3  km/s . [12]

Contents

Characteristics

This is an ordinary F-type main-sequence star with a stellar classification of F8 V, [3] generating energy via hydrogen fusion at its core. It has 115% the mass of the Sun [6] and an effective temperature of 6,007  K , [9] giving it a yellowish-white hue. However, HD 190984 has an enlarged radius of 2.31  R☉ [7] and is 1.76 magnitudes [5] brighter than the main sequence, indicating that it may instead be a subgiant evolving towards the red giant branch; [1] it radiates 5.88 times the luminosity of the Sun [8] from its photosphere. Unlike most planetary hosts, HD 190984 has an iron abundance only 32% that of the Sun's, making it metal poor. [9] At an age of 4.44 billion years, [6] it is spinning with a projected rotational velocity of 5  km/s . [10]

Planetary system

A 2010 HARPS survey detected a super Jupiter orbiting the star. It has one of the longest periods of any exoplanet known at the time, but the value is poorly constrained. [12] Further observations are required to properly constrain the orbit. In 2023, the inclination and true mass of HD 190984 b were determined via astrometry. [13]

The HD 190984 planetary system [13]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(years)		 Eccentricity Inclination Radius
b 3.58+1.2
−0.45  MJ 		8.8+2.5
−1.4		27.3+12.0
−6.1		0.745+0.054
−0.047		64+18
−23 or 116+23
−18 ° 		—

See also

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<span class="mw-page-title-main">HD 182893</span> Star in the constellation Telescopium

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<span class="mw-page-title-main">HD 189080</span> Star in the constellation of Telescopium

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<span class="mw-page-title-main">HD 179433</span> G-type giant; Corona Australis

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<span class="mw-page-title-main">HD 177565</span> Yellow dwarf w. a planet; Corona Australis

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<span class="mw-page-title-main">HD 201852</span> K-type giant star; Microscopium.

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References

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  13. 1 2 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.
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