HD 85628

Last updated
HD 85628
Observation data
Epoch J2000.0        Equinox J2000.0
Constellation Carina
A
Right ascension 09h 50m 19.201s [1]
Declination −66° 06′ 49.90″ [1]
B
Right ascension 09h 50m 18.697s [2]
Declination −66° 06′ 53.00″ [2]
Characteristics
A
Evolutionary stage main sequence
Spectral type A3V [3]
Variable type planetary transit
B
Evolutionary stage main sequence
Spectral type K8V [4]
Astrometry
A
Proper motion (μ)RA: 5.910±0.019 [1]   mas/yr
Dec.: −15.044±0.019 [1]   mas/yr
Parallax (π)5.9437 ± 0.0170  mas [1]
Distance 549 ± 2  ly
(168.2 ± 0.5  pc)
B
Proper motion (μ)RA: 5.702±0.032 [2]   mas/yr
Dec.: −13.161±0.029 [2]   mas/yr
Parallax (π)5.9266 ± 0.0253  mas [2]
Distance 550 ± 2  ly
(168.7 ± 0.7  pc)
Details [4]
A
Mass 1.75  M☉
Radius 1.92  R☉
Luminosity 12.2  L☉
Surface gravity (log g)4.1  cgs
Temperature 7,800  K
Metallicity [Fe/H]~0  dex
Age 0.8  Gyr
B
Mass 0.6  M☉
Other designations
bRing-1, HD 85628, MASCARA-4
Database references
SIMBAD data

HD 85628 (MASCARA-4) is a binary star system in the constellation of Carina. [5] The host star, HD 85628 A, is an A-type main-sequence star, the primary star of the system, with a hot Jupiter in orbit around it. The secondary star is HD 85628 B, a K-type main-sequence star. Little is known about it.

Contents

Nomenclature

This star system was first catalogued in the Henry Draper Catalog as HD 85628, its most common name. The Henry Draper Catalogue gave stars visible to the naked eye in suitable conditions a designation, indicating that this star can be seen with the naked eye. But in 2019, the Multi-site All-Sky Camera announced the discovery of the exoplanet HD 85628 Ab/MASCARA-4b around HD 85628 A. Thus, the primary star is sometimes catalogued as MASCARA-4.

Planetary system

In 2019, a hot Jupiter exoplanet was discovered by MASCARA using the transit method around HD 85628 A. [6]

The HD 85628 A planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 3.1  MJ 0.0472.80——

Related Research Articles

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HD 121504 is a star with an orbiting exoplanet in the southern constellation of Centaurus. It is located at a distance of 136 light years from the Sun based on parallax measurements, and is drifting further away with a radial velocity of 19.6 km/s. With an apparent visual magnitude of 7.54, this star is too faint to be visible to the naked eye. It shows a high proper motion, traversing the celestial sphere at an angular rate of 0.270 arcsec yr−1.

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HD 99109 is an orange-hued star with an exoplanetary companion in the constellation of Leo. It has an absolute visual magnitude of +9.10, which is too faint to be visible to the naked eye. The distance to this system is 179 light-years based on parallax, and it is drifting further away with a radial velocity of +33 km/s. The star is one and half degrees away from the celestial equator to the south.

<span class="mw-page-title-main">IC 2391</span> Open star cluster in the constellation Vela

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HAT-P-4 is a wide binary star consisting of a pair of G-type main-sequence stars in the constellation of Boötes. It is also designated BD+36°2593.

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HD 171238 is a star with an orbiting exoplanet in the southern constellation of Sagittarius. It is located at a distance of 145 light years from the Sun based on parallax measurements, and is drifting further away with a radial velocity of 21 km/s. The star has an absolute magnitude of 5.15, but at the distance of this system it is too faint to be viewed with the naked eye, having an apparent visual magnitude of 8.61.

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 148156 is a star with an orbiting exoplanet in the southern constellation of Norma. It is located at a distance of 186 light years away from the Sun, but is drifting closer with a radial velocity of –1.8 km/s. The star has an apparent visual magnitude of 7.69, which is too dim to be visible to the naked eye. A survey in 2015 ruled out the existence of any stellar companions at projected distances from 49 to 345 astronomical units.

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 166724 is a star in the southern constellation of Corona Australis. It is invisible to the naked eye with an apparent visual magnitude of +9.33. The star is located at a distance of 148 light-years from the Sun based on parallax, but is drifting closer with a radial velocity of −18 km/s. It is predicted to come as close as 97.0 light-years in around 1.2 million years from now. The star has an absolute magnitude of 6.20.

HD 106515 is a binary star in the constellation of Virgo.

References

  1. 1 2 3 4 5 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 5 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.
  3. ↑ Houk, Nancy (1975). "Michigan catalogue of two-dimensional spectral types for the HD stars". University of Michigan Catalogue of Two-Dimensional Spectral Types for the Hd Stars. Volume I. Declinations -90_ to -53_Ƒ0. 1. Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan. Bibcode:1975mcts.book.....H.
  4. 1 2 Dorval, P.; Talens, G. J. J.; Otten, G. P. P. L.; Brahm, R.; Jordán, A.; Torres, P.; Vanzi, L.; Zapata, A.; Henry, T.; Paredes, L.; Jao, W. C.; James, H.; Hinojosa, R.; Bakos, G. A.; Csubry, Z.; Bhatti, W.; Suc, V.; Osip, D.; Mamajek, E. E.; Mellon, S. N.; Wyttenbach, A.; Stuik, R.; Kenworthy, M.; Bailey, J.; Ireland, M.; Crawford, S.; Lomberg, B.; Kuhn, R.; Snellen, I. (2020). "MASCARA-4 b/BRing-1 b: A retrograde hot Jupiter around a bright A-type star". Astronomy and Astrophysics. 635: A60. arXiv: 1904.02733 . Bibcode:2020A&A...635A..60D. doi:10.1051/0004-6361/201935611. S2CID   102351446.
  5. ↑ "The Extrasolar Planet Encyclopaedia — HD 85628 A b". Extrasolar Planets Encyclopaedia . Retrieved 19 August 2023.
  6. ↑ "NASA Exoplanet Archive". Archived from the original on 2021-04-22. Retrieved 13 June 2021.


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