HD 200779

Last updated
HD 200779
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Equuleus
Right ascension 21h 05m 19.74605s [1]
Declination +07° 04′ 09.4729″ [1]
Apparent magnitude  (V)8.27 [2]
Characteristics
Spectral type K6 V [3]
U−B color index +1.12 [4]
B−V color index +1.21 [4]
R−I color index +0.61 [2]
Astrometry
Radial velocity (Rv)−66.94±0.18 [5]  km/s
Proper motion (μ)RA: +78.562  mas/yr [1]
Dec.: −563.909  mas/yr [1]
Parallax (π)66.4626 ± 0.0225  mas [1]
Distance 49.07 ± 0.02  ly
(15.046 ± 0.005  pc)
Absolute magnitude  (MV)+7.38 [6]
Details
Mass 0.68±0.01 [7]   M☉
Radius 0.689+0.077
−0.050 [8]   R☉
Luminosity 0.18 [9]   L☉
Surface gravity (log g)4.67±0.02 [7]   cgs
Temperature 4,406±73 [10]   K
Metallicity [Fe/H]+0.05±0.06 [7]   dex
Rotational velocity (v sin i)5.1±1.2 [5]  km/s
Age 6.33 [11]   Gyr
Other designations
AG+06°2882, BD+06°4741, GC  29447, GJ  818, HD  200779, HIP  104092, SAO  126533, CCDM J21054+0704A, WDS J21053+0704A, LFT  160, LHS  3624, LTT  16169 [12]
Database references
SIMBAD data
ARICNS data

HD 200779 (HIP 104092; Gliese 818; LHS 3624) is a solitary star located in the equatorial constellation Equuleus, the foal. It has an apparent magnitude of 8.27, [2] making it readily visible in binoculars but not to the naked eye. The object is located relatively close at a distance of 49 light years based on Gaia DR3 parallax measurements, [1] and it is approaching rapidly with a heliocentric radial velocity of −67  km/s . [5] It is classified as a high proper motion star, [12] with a total proper motion of 569  mas /yr. [1]

At its current distance, HD 200779's brightness is diminished by only six hundredths of a magnitude due to interstellar dust [13] and it has an absolute magnitude of +7.38. [6] HD 200779 is expected to come within 7.76 parsecs (25.3 ly) of the Solar System in roughly 160,000 years. [14]

HD 200779 is an ordinary K-type main-sequence star with a stellar classification of K6 V. [3] It has 68% the mass of the Sun [7] and 69% of its radius. [8] However, it only radiates 18% the luminosity of the Sun [9] from its photosphere at an effective temperature of 4,406  K , [10] giving it an orange hue. It has an iron abundance slightly above solar level at [Fe/H] = +0.05 [7] and it is estimated to be 6.33 billion years old. [11] HD 200779 spins modestly with a projected rotational velocity of 5.1  km/s . [5] The star is generally considered to be chromospherically active. [3]

HD 200779 has two optical companions: a distant 11th magnitude star located 64.6" away and a 9th magnitude star located 169.4" away. [15]

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<span class="mw-page-title-main">HD 193307</span> High proper motion star; Telescopium

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<span class="mw-page-title-main">HD 98617</span> Double star in the constellation Chamaeleon

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<span class="mw-page-title-main">HD 201772</span> Star in the constellation Microscopium

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<span class="mw-page-title-main">HD 198716</span> Star in the constellation of Microscopium

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<span class="mw-page-title-main">HD 22764</span> Double star; Camelopardalis

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<span class="mw-page-title-main">HD 204018</span> Visual binary in Microscopium

HD 204018, also designated as HR 8202, is a visual binary located in the southern constellation Microscopium. The primary has an apparent magnitude of 5.58, making it faintly visible to the naked eye under ideal conditions. The companion has an apparent magnitude of 8.09. The system is located relatively close at a distance of 176 light years based on Gaia DR3 parallax measurements but is receding with a heliocentric radial velocity of 18.3 km/s. At its current distance, HD 204018's combined brightness is diminished by 0.13 magnitudes due to interstellar dust.

<span class="mw-page-title-main">HD 24141</span> Am star?; Camelopardalis

HD 24141, also known as HR 1192, is a star located in the northern constellation Camelopardalis, the giraffe. It is faintly visible to the naked eye as a white-hued point of light with an apparent magnitude of 5.79. The object is located relatively close at a distance of 176 light-years based on Gaia DR3 parallax measurements and it is slowly drifting closer with a heliocentric radial velocity of −0.2 km/s. At its current distance, HD 24141's brightness is diminished by 0.17 magnitudes due to interstellar extinction and it has an absolute magnitude of +2.28.

References

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