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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.
| 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] |
| Distance | 942 ± 3 ly (288.9 ± 1.0 pc) |
| Details | |
| Mass | 1.10+0.06 −0.04[5] M☉ |
| Radius | 1.76+0.11 −0.08[5] R☉ |
| Luminosity | 2.76[1] L☉ |
| Surface gravity (log g) | 4.01±0.03[6] cgs |
| Temperature | 5715±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 |
| Age | 8.3+1.3 −1.2[5] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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]
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]
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]
| 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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