WASP-63

Star in the constellation Columba From Wikipedia, the free encyclopedia

WASP-63 or Kosjenka, also known as CD-38 2551, is a single star with an exoplanetary companion in the southern constellation of Columba. It is too faint to be visible with the naked eye, having an apparent visual magnitude of 11.1.[2] The distance to this system is approximately 942 light-years (289 parsecs) based on parallax measurements, but it is drifting closer with a radial velocity of −24 km/s.

Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
WASP-63
Observation data
Epoch J2000      Equinox J2000
Constellation Columba
Right ascension 06h 17m 20.7485s[1]
Declination −38° 19 23.754[1]
Apparent magnitude (V) 11.10±0.08[2]
Characteristics
Evolutionary stage subgiant[1][2]
Spectral type G8[3]
B−V color index 0.741±0.022[4]
J−K color index 0.425±0.032[4]
Astrometry
Radial velocity (Rv)−23.55±0.25[1] km/s
Proper motion (μ) RA: −17.469 mas/yr[1]
Dec.: −27.292 mas/yr[1]
Parallax (π)3.4609±0.0118 mas[1]
Distance942 ± 3 ly
(288.9 ± 1.0 pc)
Details
Mass1.10+0.06
0.04
[5] M
Radius1.76+0.11
0.08
[5] R
Luminosity2.76[1] L
Surface gravity (log g)4.01±0.03[6] cgs
Temperature5715±60[6] K
Metallicity [Fe/H]0.08±0.07 dex[5]
0.28±0.05[6] dex
Rotational velocity (v sin i)2.8±0.5[5] km/s
Age8.3+1.3
1.2
[5] Gyr
Other designations
Kosjenka, CD−38 2551, TOI-483, WASP-63, TYC 7612-556-1, GSC 07612-00556, 2MASS J06172074-3819237[7]
Database references
SIMBADdata
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Nomenclature

The designation WASP-63 indicates that this was the 63rd star found to have a planet by the Wide Angle Search for Planets.

In August 2022, this planetary system was included among 20 systems to be named by the third NameExoWorlds project.[8] The approved names, proposed by a team from Croatia, were announced in June 2023. WASP-63 is named Kosjenka and its planet is named Regoč, after characters from Croatian Tales of Long Ago by Ivana Brlić-Mažuranić.[9]

Stellar properties

This is a G-type star with a stellar classification of G8;[3] the luminosity class is currently unknown. The star is much older than the Sun at approximately 8.3+1.3
1.2
billion years. WASP-63 is slightly enriched in heavy elements, having 120% of the solar abundance of iron.[5] The stellar radius is enlarged for a G8 star,[3] and models suggest it has evolved into a subgiant star.[1] It has 1.1 times the mass of the Sun and is spinning with a projected rotational velocity of 3 km/s.[5]

Planetary system

In 2012 a transiting gas giant planet WASP-63b was detected on a tight, circular orbit.[3] Its equilibrium temperature is 1536±37 K, and measured dayside temperature is 1547±308 K.[10] The planet is similar to Saturn in mass but is highly inflated due to proximity to the parent star. The planetary atmosphere contains water and likely has a high cloud deck of indeterminate composition.[11]

More information Companion (in order from star), Mass ...
The WASP-63 planetary system[5]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b / Regoč 0.339±0.03 MJ 0.05417+0.00067
0.00089
4.3780900±0.000006 0.026+0.040
0.029
87.8±1.3° 1.33±0.24 RJ
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References

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