Astronomy:HD 85628

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Short description: Binary star in Carina


HD 85628
Observation data
{{#ifeq:J2000.0|J2000.0 (ICRS)|Epoch J2000.0      Equinox J2000.0 (ICRS)| [[History:Epoch|Epoch J2000.0]]      [[Astronomy:Equinox (celestial coordinates)|Equinox J2000.0}}
Constellation Carina[1]
A
Right ascension  09h 50m 19.201s[2]
Declination −66° 06′ 49.90″[2]
Apparent magnitude (V) 8.19[3]
B
Right ascension  09h 50m 18.697s[4]
Declination −66° 06′ 53.00″[4]
Apparent magnitude (V)
Characteristics
A
Evolutionary stage main sequence[2]
Spectral type A3V[5]
Variable type planetary transit[6]
B
Evolutionary stage main sequence[6]
Spectral type K8V[6]
Astrometry
A
Proper motion (μ) RA: 5.910±0.019[2] mas/yr
Dec.: −15.044±0.019[2] mas/yr
Parallax (π)5.9437 ± 0.0170[2] mas
Distance549 ± 2 ly
(168.2 ± 0.5 pc)
B
Proper motion (μ) RA: 5.702±0.032[4] mas/yr
Dec.: −13.161±0.029[4] mas/yr
Parallax (π)5.9266 ± 0.0253[4] mas
Distance550 ± 2 ly
(168.7 ± 0.7 pc)
Details[6]
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☉
Temperature4,088[7] K
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.[8] 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, a hot Jupiter exoplanet was discovered by MASCARA using the transit method around HD 85628 A.[9]

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. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R  Constellation record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355. Bibcode: 2000A&A...355L..27H. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  5. ↑ 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 (Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan) 1. Bibcode: 1975mcts.book.....H. 
  6. ↑ 6.0 6.1 6.2 6.3 Dorval, P.; Talens, G. J. J.; Otten, G. P. P. L.; Brahm, R.; Jordán, A.; Torres, P.; Vanzi, L.; Zapata, A. et al. (2020). "MASCARA-4 b/BRing-1 b: A retrograde hot Jupiter around a bright A-type star". Astronomy and Astrophysics 635: A60. doi:10.1051/0004-6361/201935611. Bibcode: 2020A&A...635A..60D. 
  7. ↑ Michel, Kai-Uwe; Mugrauer, Markus (2024). "Gaia search for (Sub)stellar companions of exoplanet hosts". Monthly Notices of the Royal Astronomical Society 527 (2): 3183. doi:10.1093/mnras/stad3196. Bibcode: 2024MNRAS.527.3183M. 
  8. ↑ "The Extrasolar Planet Encyclopaedia — HD 85628 A b". Extrasolar Planets Encyclopaedia. https://exoplanet.eu/catalog/hd_85628_a_b--7080/. Retrieved 19 August 2023. 
  9. ↑ "NASA Exoplanet Archive". https://exoplanetarchive.ipac.caltech.edu/cgi-bin/TblView/nph-tblView?app=ExoTbls&config=compositepars. 



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