HD 38283

Bubup, or HD 38283, is a star in the southern circumpolar constellation Mensa. With an magnitude of 6.70, its invisible to the naked eye but can be seen with binoculars. Bubup is located relatively close at a distance of 124 light-years[1] but is recceding with a heliocentric radial velocity of 61.4 km/s.[1]

Bubup
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Mensa
Right ascension 05h 37m 02.0168s[1]
Declination −73° 41′ 57.645″[1]
Apparent magnitude (V) 6.70[2]
Characteristics
Spectral type F9.5 V[3]
B−V color index 0.540[4]
Astrometry
Radial velocity (Rv)61.4 ± 0.2[1] km/s
Proper motion (μ) RA: 138.785[1] mas/yr
Dec.: −108.526[1] mas/yr
Parallax (π)26.2443 ± 0.0250 mas[1]
Distance124.3 ± 0.1 ly
(38.10 ± 0.04 pc)
Absolute magnitude (MV)3.82[4]
Details[5]
Mass1.37 ± 0.07 M☉
Radius1.49 ± 0.0 R☉
Luminosity2.35[4] L☉
Surface gravity (log g)4.23 ± 0.02 cgs
Temperature5,981 ± 12 K
Metallicity [Fe/H]−0.18 dex
Rotational velocity (v sin i)3.8[6] km/s
Age7.43[6] Gyr
Other designations
CD−73°253, HIP 26380, SAO 256213, 2MASS J05370199-7341574[7]
Database references
SIMBADdata

Nomelaculture

The star was given the name "Bubup", the Boonwurrung word for "child", by the IAU, chosen by representatives of Australia for the 2019 NameExoWorlds contest.[8]

Properties

Bubup has a stellar classification of F9.5 V,[3] indicating that it is an ordinary late F-type main-sequence star just shy of being a G-type main-sequence star. At present it has 137% the mass of the Sun[5] and 149% the radius of the Sun.[5] It shines at about double the luminosity of the Sun from its photosphere at an effective temperature of 5981 K,[5] which gives it a yellow glow. Unlike most planetary hosts, Bubup is metal-deficient with an iron abundance 66% that of the Sun[5] and is older than the latter with an age of about 7 billion years.[6] Currently, it spins leisurely with a projected rotational velocity of about 4 km/s.[6]

A survey in 2015 has ruled out the existence of any stellar companions at projected distances above 11 AU.[9]

Planetary system

On April 11, 2011, a Saturnian planet, Yanyan (HD 38283 b), was discovered in an Earth-like 363-day orbit.[4] Yanyan itself turns out to be unable to host habitable exomoons, both because of its significant eccentricity (for the single eccentric planet solution), and because of the overluminosity of its host star compared to the Sun.[4]

The HD 38283 planetary system[10]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b ≥0.289±0.034 MJ 1.020±0.002 361.0±1.1 0.474±0.136 — —

See also

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
  3. Gray, R. O.; et al. (2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample". The Astronomical Journal. 132 (1): 161–170. arXiv:astro-ph/0603770. Bibcode:2006AJ....132..161G. doi:10.1086/504637. S2CID 119476992.
  4. Tinney, C. G.; et al. (April 2011). "The Anglo-Australian Planet Search. XXI. A Gas-giant Planet in a One Year Orbit and the Habitability of Gas-giant Satellites". The Astrophysical Journal. 732 (1). 31. Bibcode:2011ApJ...732...31T. doi:10.1088/0004-637x/732/1/31.
  5. Stassun, Keivan G.; Collins, Karen A.; Gaudi, B. Scott (2017). "Accurate Empirical Radii and Masses of Planets and Their Host Stars with Gaia Parallaxes". The Astronomical Journal. 153 (3): 136. arXiv:1609.04389. Bibcode:2017AJ....153..136S. doi:10.3847/1538-3881/aa5df3. S2CID 119219062.
  6. Delgado Mena, E.; et al. (April 2015). "Li abundances in F stars: planets, rotation, and Galactic evolution". Astronomy & Astrophysics. 576: 24. arXiv:1412.4618. Bibcode:2015A&A...576A..69D. doi:10.1051/0004-6361/201425433. S2CID 56051637. A69.
  7. "HD 38283". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-08-22.
  8. "Approved names (§ Australia)". Name Exo Worlds. IAU. Retrieved 19 December 2019.
  9. Mugrauer, M.; Ginski, C. (12 May 2015). "High-contrast imaging search for stellar and substellar companions of exoplanet host stars". Monthly Notices of the Royal Astronomical Society. 450 (3): 3127–3136. Bibcode:2015MNRAS.450.3127M. doi:10.1093/mnras/stv771.
  10. Wittenmyer, Robert A.; et al. (2020). "Cool Jupiters greatly outnumber their toasty siblings: occurrence rates from the Anglo-Australian Planet Search". Monthly Notices of the Royal Astronomical Society. 492 (1): 377–383. arXiv:1912.01821. Bibcode:2020MNRAS.492..377W. doi:10.1093/mnras/stz3436. S2CID 208617606.
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