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]
Distance549 ± 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]
Distance550 ± 2 ly
(168.7 ± 0.7 pc)
Details[4]
A
Mass1.75 M☉
Radius1.92 R☉
Luminosity12.2 L☉
Surface gravity (log g)4.1 cgs
Temperature7,800 K
Metallicity [Fe/H]~0 dex
Age0.8 Gyr
B
Mass0.6 M☉
Other designations
bRing-1, HD 85628, MASCARA-4
Database references
SIMBADdata

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.

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, an 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 0.047 2.8 0 — —

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. Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan. 1. 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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