HD 191760

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HD 191760
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Telescopium
Right ascension 20h 13m 26.74628s [1]
Declination −46° 12′ 03.7089″ [1]
Apparent magnitude  (V)8.26 [2]
Characteristics
Evolutionary stage Subgiant [3]
Spectral type G3IV/V [3]
B−V color index 0.668±0.014 [2]
Variable type Constant [4]
Astrometry
Radial velocity (Rv)−30.06±0.20 [1]  km/s
Proper motion (μ)RA: −0.723  mas/yr [1]
Dec.: −62.019  mas/yr [1]
Parallax (π)11.2610 ± 0.1091  mas [1]
Distance 290 ± 3  ly
(88.8 ± 0.9  pc)
Absolute magnitude  (MV)3.71 [2]
Orbit [3]
Period (P)505.65±0.42  d
Semi-major axis (a)1.35  AU
Eccentricity (e)0.63±0.01
Inclination (i)158.96±5.99 [5] °
Periastron epoch (T)2454835.65±2.06
Argument of periastron (ω)
(secondary)		200.37±0.28°
Semi-amplitude (K1)
(primary)		1.04783±0.03871 km/s
Details [3]
Mass 1.28+0.02
−0.10  M☉
Radius 1.62±0.07  R☉
Luminosity 2.69±0.20  L☉
Surface gravity (log g)4.13+0.05
−0.04  cgs
Temperature 5,794±76  K
Metallicity [Fe/H]0.29±0.07  dex
Rotation 25.2 or 35.1 d
Rotational velocity (v sin i)2.33±0.05 km/s
Age 4.1+0.8
−2.8  Gyr
HD 191760 b
Mass 106.34±29.03 [5]   MJup
Other designations
CD−46°13445, HD  191760, HIP  99661, SAO  230105 [6]
Database references
SIMBAD data

HD 191760 is a star in the southern constellation of Telescopium. It has a yellow hue but is too dim to be visible to the naked eye with an apparent visual magnitude of 8.26. [2] The star is located at a distance of approximately 290  light-years from the Sun based on parallax, but is drifting closer with a radial velocity of −30 km/s. [1]

The stellar classification of G3IV/V is consistent with a star that is evolving onto the subgiant branch, having exhausted the supply of hydrogen at its core. It is roughly four billion years old with a modest projected rotational velocity of 2.3 km/s. The star is 28% more massive than the Sun and 62% as large. The metallicity, or abundance of heavier elements, is higher than in the Sun. The star is radiating 2.7 times the luminosity of the Sun from its photosphere at an effective temperature of 5,794 K. [3]

Companion

Using the ESO HARPS instrument, in 2009 HD 191760 was found to have a brown dwarf at least 38 times as massive as Jupiter orbiting at an average distance of 1.35  AU in a period of 506 days. This is an unusual distance from the star that has been termed the 'brown dwarf desert'. [3] The upper limit on the mass of this object is 28% of the mass of the Sun (0.28 M☉). [7]

In 2023, the true mass of this object was determined using Gaia astrometry. At about 106 times the mass of Jupiter, this is a low-mass star (presumably a red dwarf) and not a brown dwarf. [5]

Related Research Articles

HD 114729 is a Sun-like star with an orbiting exoplanet in the southern constellation of Centaurus. Based on parallax measurements, it is located at a distance of 124 light years from the Sun. It is near the lower limit of visibility to the naked eye, having an apparent visual magnitude of 6.68 The system is drifting further away with a heliocentric radial velocity of 26.3 km/s. The system has a relatively high proper motion, traversing the celestial sphere at an angular rate of 0.373″·yr−1.

HD 132406 is a star in the northern constellation of Boötes. With an apparent visual magnitude of 8.45, it is invisible to the naked eye. The distance to this star is 230 light-years based on parallax, but it is drifting closer with a radial velocity of −37.8 km/s. The star has an absolute magnitude of 4.30. It has one confirmed exoplanet companion.

HD 4113 is a dual star system in the southern constellation of Sculptor. It is too faint to be viewed with the naked eye, having an apparent visual magnitude of 7.88. The distance to this star, as estimated by parallax measurements, is 137 light years. It is receding away from the Sun with a radial velocity of +5 km/s.

HD 41004 is a visual binary star system in the southern constellation of Pictor. It is too faint to be visible to the naked eye, having a combined apparent visual magnitude of 8.65. The two components have a magnitude difference of 3.7, and share a common proper motion with an angular separation of 0.30″, as of 2018. The distance to this system is approximately 127 light-years based on parallax. It is drifting further away from the Sun with a radial velocity of +42.5 km/s, having come to within 44.5 ly some 831,000 years ago.

HD 190228 is a star with an orbiting substellar companion in the northern constellation of Vulpecula. Its apparent magnitude is 7.30 – too faint to be seen with the naked eye – and the absolute magnitude is 3.34. Based on parallax measurements, it is located at a distance of 205 light-years from the Sun. The system is drifting closer with a radial velocity of −50 km/s.

HD 213240 is a possible binary star system in the constellation Grus. It has an apparent visual magnitude of 6.81, which lies below the limit of visibility for normal human sight. The system is located at a distance of 133.5 light years from the Sun based on parallax. The primary has an absolute magnitude of 3.77.

<span class="mw-page-title-main">HD 13189</span> Orange-hued star in the constellation Taurus

HD 13189 is a star with an orbiting companion in the northern constellation of Triangulum constellation. With an apparent visual magnitude of +7.57, it is too faint to be visible to the normal human eye. The distance to this system is approximately 1,590 light years based on parallax measurements, and it is drifting further away with a radial velocity of 25.39 km/s. In 2005, a planetary companion or brown dwarf was announced in orbit around this star.

HD 162020 is a star in the southern constellation of Scorpius with a likely red dwarf companion. It has an apparent visual magnitude of 9.10, which is too faint to be visible to the naked eye. The distance to this system is 102 light-years based on stellar parallax. It is drifting closer to the Sun with a radial velocity of −27 km/s, and is predicted to come to within ~18 light-years in 1.1 million years.

HD 164427 is a star with a likely red dwarf companion in the southern constellation of Pavo. It has an apparent visual magnitude of 6.88, placing it just below the nominal limit for visibility with the typical naked eye. The annual parallax shift of 23.5 mas yields a distance estimate of 139 light-years. It is moving further from the Earth with a heliocentric radial velocity of +3.4 km/s.

HD 140913 is a Sun-like star located in the northern constellation of Corona Borealis. It is too faint to be visible to the naked eye with an apparent visual magnitude of 8.07. The star is located at a distance of 159 light-years from the Sun based on parallax. Prior to the discovery of a companion, this served as an IAU radial velocity standard, and it is receding from the Sun at a rate of +37 km/s. The space velocity components of this star are (U, V, W) = (-21.77, -14.42, 1.67).

HD 60532 is a star with two orbiting exoplanets in the southern constellation of Puppis. The designation HD 60532 takes its name from the Henry Draper Catalogue. The system is located at a distance of 85.5 light years from the Sun, and is drifting further away with a radial velocity of 61 km/s. At that distance, the star has an apparent visual magnitude of 4.45, which is bright enough to be faintly visible to the naked eye. The motion of this system through space brought it within 10.3 light-years of the Sun some 408,600 years ago.

BD−17 63 is a low-mass K-type main-sequence star in the southern constellation Cetus. It is a 10th magnitude star at a distance of 113 light-years from Earth. The star is rotating slowly with a negligible level of magnetic activity and an age of over 4 billion years.

HD 16760 is a binary star system approximately 227 light-years away in the constellation Perseus. The primary star HD 16760 is a G-type main sequence star similar to the Sun. The secondary, HIP 12635 is 1.521 magnitudes fainter and located at a separation of 14.6 arcseconds from the primary, corresponding to a physical separation of at least 660 AU. Announced in July 2009, HD 16760 has been confirmed to have a red dwarf orbiting it, formerly thought to be a brown dwarf or exoplanet.

HD 181720 is star with an orbiting substellar companion in the southern constellation of Sagittarius. It is located at a distance of 196 light years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −45.4 km/s. The star has an absolute magnitude of 4.10, but at that distance it has an apparent visual magnitude of 7.84, which is too faint to be seen with the naked eye. It shows a high proper motion, traversing the celestial sphere at an angular rate of 0.444 arcsec yr−1.

HD 104067 is a star with a planetary system in the southern constellation of Corvus. It has an apparent visual magnitude of 7.92 which is too faint to be visible with the naked eye. The distance to this star is 66.4 light-years based on parallax. It is drifting further away with a radial velocity of +15 km/s.

HIP 70849 is a star with two non-stellar companions in the southern constellation Lupus. It is a 10th magnitude star, making it too faint to be visible to the naked eye. The system is located at a distance of 78.7 light-years from the Sun based on parallax measurements.

HD 152079 is a star with an orbiting exoplanet in the southern constellation of Ara. It is located at a distance of 287 light years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −21 km/s. At that distance the star is much too faint to be visible with the naked eye, having an apparent visual magnitude of 9.18.

HD 175167 is a star with an exoplanet companion in the southern constellation of Pavo. It is too faint to be visible with the naked eye at an apparent visual magnitude of 8.01. The system is located at a distance of 232 light-years from the Sun based on parallax measurements, and it is drifting further away with a radial velocity of 5 km/s. It shows a high proper motion, traversing the celestial sphere at an angular rate of 0.190 arcsec yr−1.

HD 79498 is a double star in the northern constellation of Cancer. The primary component of this pair has an orbiting exoplanet companion. This star is too faint to be viewed with the naked eye, having an apparent visual magnitude of 8.05. The system is located at a distance of 159 light years based on parallax measurements, and is drifting further away with a heliocentric radial velocity of 20 km/s. It has a relatively high proper motion, traversing the celestial sphere at an angular rate of 0.2″·yr−1.

HD 156279 is a star with a pair of orbiting exoplanets located in the northern constellation of Draco. It has various alternate designations, including HIP 84171 and BD+63 1335. Parallax measurements yield a distance of 118 light years from the Sun, but it is drifting closer with a radial velocity of −20 km/s. Despite an absolute magnitude of 5.25, at that distance the star is too faint to be visible to the naked eye with an apparent visual magnitude of 8.17. It is presumed to be a single star, as in 2019 all imaging surveys have failed to find any stellar companions.

References

  1. 1 2 3 4 5 6 7 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. 1 2 3 4 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. 1 2 3 4 5 6 Jenkins, J. S.; et al. (September 2009). "First Results From the Calan–Hertfordshire Extrasolar Planet Search: Exoplanets and the Discovery of an Eccentric Brown Dwarf in the Desert". Monthly Notices of the Royal Astronomical Society. 398 (2): 911–17. arXiv: 0905.2985 . Bibcode:2009MNRAS.398..911J. doi: 10.1111/j.1365-2966.2009.15097.x . S2CID   1913088.
  4. ↑ Paunzen, E.; et al. (January 1995). "Detection of Variability in HD191850". Information Bulletin on Variable Stars. 4151: 1. Bibcode:1995IBVS.4151....1P.
  5. 1 2 3 Stevenson, Adam T.; Haswell, Carole A.; et al. (December 2023). "Combing the brown dwarf desert with Gaia DR3". Monthly Notices of the Royal Astronomical Society . 526 (4): 5155–5171. arXiv: 2310.02695 . Bibcode:2023MNRAS.526.5155S. doi: 10.1093/mnras/stad3041 .
  6. ↑ "HD 191760". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2020-12-12.
  7. ↑ Sahlmann, J.; et al. (January 2011). "Search for brown-dwarf companions of stars". Astronomy and Astrophysics. 525: 24. arXiv: 1009.5991 . Bibcode:2011A&A...525A..95S. doi:10.1051/0004-6361/201015427. S2CID   119276951. A95.
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