WASP-63
Star in the constellation Columba
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WASP-63, also named Kosjenka, 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.[3] 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.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Columba[1] |
| Right ascension | 06h 17m 20.7485s[2] |
| Declination | −38° 19′ 23.754″[2] |
| Apparent magnitude (V) | 11.10±0.08[3] |
| Characteristics | |
| Evolutionary stage | subgiant[2][3] |
| Spectral type | G8[4] |
| B−V color index | 0.741±0.022[5] |
| J−K color index | 0.425±0.032[5] |
| Astrometry | |
| Radial velocity (Rv) | −23.55±0.25[2] km/s |
| Proper motion (μ) | RA: −17.469 mas/yr[2] Dec.: −27.292 mas/yr[2] |
| Parallax (π) | 3.4609±0.0118 mas[2] |
| Distance | 942 ± 3 ly (288.9 ± 1.0 pc) |
| Details | |
| Mass | 1.10+0.06 −0.04[6] M☉ |
| Radius | 1.76+0.11 −0.08[6] R☉ |
| Luminosity | 2.76[2] L☉ |
| Surface gravity (log g) | 4.01±0.03[7] cgs |
| Temperature | 5715±60[7] K |
| Metallicity [Fe/H] | 0.08±0.07 dex[6] 0.28±0.05[7] dex |
| Rotational velocity (v sin i) | 2.8±0.5[6] km/s |
| Age | 8.3+1.3 −1.2[6] Gyr |
| Other designations | |
| Kosjenka, CD−38 2551, TOI-483, WASP-63, TYC 7612-556-1, GSC 07612-00556, 2MASS J06172074-3819237[8] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
Nomenclature
The designation WASP-63 indicates that this was the 63rd star found to have a planet by the Wide Angle Search for Planets. It is also known as CD-38 2551 from the Durchmusterung catalog.[8]
In the 2019 NameExoWorlds campaign, this system was assigned to Malawi[9][10] but did not get named at that time. It was then included among 20 systems to be named by the following NameExoWorlds campaign in August 2022.[11] 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.[12]
Stellar properties
This is a G-type star with a stellar classification of G8;[4] 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.[6] The stellar radius is enlarged for a G8 star,[4] and models suggest it has evolved into a subgiant star.[2] It has 1.1 times the mass of the Sun and is spinning with a projected rotational velocity of 3 km/s.[6]
Planetary system
In 2012 a transiting gas giant planet WASP-63b was detected on a tight, circular orbit.[4] Its equilibrium temperature is 1536±37 K, and measured dayside temperature is 1547±308 K.[13] 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.[14]
| 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 |