HD 170642

Last updated
HD 170642
Corona Australis constellation map.svg
Red circle.svg
Location of HD 170642 (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Corona Australis
Right ascension 18h 32m 21.33140s [1]
Declination −39° 42 14.4023 [1]
Apparent magnitude  (V)5.16±0.01 [2]
Characteristics
Spectral type A3 V [3] or A3 Van [4]
B−V color index +0.08 [5]
Astrometry
Radial velocity (Rv)−6±4.2 [6]  km/s
Proper motion (μ)RA: +32.47  mas/yr [1]
Dec.: −37.47  mas/yr [1]
Parallax (π)14.23 ± 0.23  mas [1]
Distance 229 ± 4  ly
(70 ± 1  pc)
Absolute magnitude  (MV)+0.93 [7]
Details
Mass 2.25 [8]   M
Radius 2.59±0.13 [9]   R
Luminosity 32.6 [10]   L
Surface gravity (log g)3.96 [11]   cgs
Temperature 8,938±161 [12]   K
Metallicity [Fe/H]+0.24 [11]   dex
Rotational velocity (v sin i)177±1 [13]  km/s
Age 480 [8]   Myr
Other designations
13 G. Coronae Australis [14] , CD−39°12696, CPD−39°8114, GC  25285, HD  170642, HIP  90887, HR  6942, SAO  210277 [15]
Database references
SIMBAD data

HD 170642, also designated as HR 6942 or rarely 13 G. Coronae Australis, is a single star [16] located in the southern constellation Corona Australis. It is faintly visible to the naked eye as a white hued star with an apparent magnitude of 5.16. [2] The object is located relatively close at a distance of 229 light years based on Hipparcos parallax measurements, [1] but it is approaching the Solar System with a somewhat constrained heliocentric radial velocity of −6  km/s . [6] At its current distance, HD 170642's brightness is diminished by 0.28 magnitudes due to interstellar dust. [17] It has an absolute magnitude of +0.93. [7]

This is an ordinary A-type main-sequence star with a stellar classification of A3 V. [3] Other sources include broad/nebulous absorption lines due to rapid rotation. [18] [4] It has 2.25 times the mass of the Sun and is estimated to be 480 million years old. [8] HD 170642 has a radius of 2.59  R. [9] When combined with an effective temperature of 8,938  K , [12] it radiates 32.6 times the luminosity of the Sun [10] from its photosphere. The star is metal enriched, having an iron abundance 74% greater than the Sun's. [11] Like many hot stars HD 170642 spins rapidly, having a projected rotational velocity of 177  km/s . [13]

Related Research Articles

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<span class="mw-page-title-main">HD 24479</span> Star in the constellation Camelopardalis

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<span class="mw-page-title-main">N Scorpii</span> Star in the constellation of Scorpius

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<span class="mw-page-title-main">HD 26764</span> Star in the constellation Camelopardalis

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<span class="mw-page-title-main">14 Trianguli</span> Star in the constellation Triangulum

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<span class="mw-page-title-main">WZ Columbae</span> Star in the constellation of Columba

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HD 34255, also known HR 1720, is a star located in the northern circumpolar constellation Camelopardalis, the giraffe. It has an apparent magnitude of 5.60, allowing it to be faintly visible to the naked eye. The object is located relatively far at a distance of about 1.65 kly but is approaching the Solar System with a heliocentric radial velocity of −7.7 km/s.

HD 50885, also known as HR 2581, is a star located in the northern circumpolar constellation Camelopardalis, the giraffe. It has an apparent magnitude of 5.69, making it faintly visible to the naked eye if viewed under ideal conditions. Based on parallax measurements from Gaia DR3, the object is estimated to be 513 light years distant. It appears to be approaching the Solar System with a heliocentric radial velocity of −17.8 km/s.

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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 197630</span> Star in the constellation of Microscopium

HD 197630, also known as HR 7933 or rarely 23 G. Microscopii, is a probable astrometric binary located in the southern constellation Microscopium. The visible component is a bluish-white hued star that is faintly visible to the naked eye with an apparent magnitude of 5.47. Based on parallax measurements from the Gaia satellite, the system is estimated to be 328 light years away. However, it is drifting closer with a heliocentric radial velocity of −30 km/s. At its current distance, HD 197630's brightness is diminished by 0.11 magnitudes due to interstellar dust. A 2012 multiplicity survey failed to confirm the velocity variations.

<span class="mw-page-title-main">HD 168592</span> Star in the constellation of Corona Australis

HD 168592, also designated as HR 6862 or rarely 7 G. Coronae Australis, is a solitary star located in the southern constellation Corona Australis. It is faintly visible to the naked eye as an orange-hued star with an apparent magnitude of 5.07. Gaia DR3 parallax measurements place it at a distance of 490 light years and is currently receding with a heliocentric radial velocity of 18 km/s. At its current distance, HD 168592's brightness is diminished by 0.38 magnitudes due to interstellar dust. It has an absolute magnitude of −0.76.

<span class="mw-page-title-main">HD 31134</span> Star in the constellation of Camelopardalis

HD 31134, also designated as HR 1561, is a solitary star located in the northern circumpolar constellation Camelopardalis, the giraffe. It is faintly visible to the naked eye as a white-hued star with an apparent magnitude of 5.74. Gaia DR3 parallax measurements place it 473 light years away. It appears to be approaching the Solar System with a heliocentric radial velocity of −15.1 km/s. At its current distance, HD 31134's brightness is diminished by 0.35 magnitudes due to interstellar dust. It has an absolute magnitude of +0.19.

<span class="mw-page-title-main">HD 23005</span> Star in Camelopardlis

HD 23005, also known as HR 1124, is a soltiary, yellowish-white hued star located in the northern circumpolar constellation Camelopardalis, the giraffe. It has an apparent magnitude of 5.78, making it faintly visible to the naked eye. The object is located relatively close at a distance of 173 light years based on Gaia DR3 parallax measurements but is receding with a heliocentric radial velocity of 4.9 km/s. At its current distance, HD 23005's brightness is diminished by 0.15 magnitudes due to extinction from interstellar dust. It has an absolute magnitude of +2.07.

<span class="mw-page-title-main">HD 174474</span> High proper motion star; Telescopium

HD 174474, also designated as HR 7095 or rarely 35 G. Telescopii, is a solitary white-hued star located in the southern constellation Telescopium. It has an apparent magnitude of 6.17, placing it near the limit for naked eye visibility. The object is located relatively close at a distance of 244 light years based on Gaia DR3 parallax measurements but is drifting closer with a heliocentric radial velocity of −44 km/s. At its current distance, HD 174474's brightness is diminished by 0.26 magnitudes due to interstellar dust. It has an absolute magnitude of +1.61.

<span class="mw-page-title-main">HD 170521</span> Distant K-type giant; Corona Australis

HD 170521, also known as HR 6937 or rarely 12 G. Coronae Australis, is a solitary star located in the southern constellation Corona Australis. It is faintly visible to the naked eye as an orange-hued point of light with an apparent magnitude of 5.69. The object is located relatively far at a distance of approximately 1,500 light years based on Gaia DR3 parallax measurements, and it is receding with a heliocentric radial velocity of 7.2 km/s. At its current distance, HD 170521's brightness is heavily diminished by 0.46 magnitudes due to extinction from interstellar dust and it has an absolute magnitude of −1.90.

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