Astronomy: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 |
| A | |
| Right ascension | 09h 50m 19.201s[1] |
| Declination | −66° 06′ 49.90″[1] |
| Apparent magnitude (V) | |
| B | |
| Right ascension | 09h 50m 18.697s[2] |
| Declination | −66° 06′ 53.00″[2] |
| Apparent magnitude (V) | |
| 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[1] mas |
| 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[2] mas |
| 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.
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]
| 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
- ↑ 1.0 1.1 1.2 1.3 1.4 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.
- ↑ 2.0 2.1 2.2 2.3 2.4 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.
- ↑ 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.
- ↑ 4.0 4.1 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.
- ↑ "The Extrasolar Planet Encyclopaedia — HD 85628 A b". Extrasolar Planets Encyclopaedia. https://exoplanet.eu/catalog/hd_85628_a_b--7080/. Retrieved 19 August 2023.
- ↑ "NASA Exoplanet Archive". https://exoplanetarchive.ipac.caltech.edu/cgi-bin/TblView/nph-tblView?app=ExoTbls&config=compositepars.
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