Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Chamaeleon |
Right ascension | 07h 39m 21.85290s[1] |
Declination | −78° 16′ 44.3078″[1] |
Apparent magnitude (V) | 9.36±0.02[2] |
Characteristics | |
Spectral type | K3 V(k)[3] |
U−B color index | +0.98[4] |
B−V color index | +1.06[2] |
Astrometry | |
Radial velocity (Rv) | +33.8[5] km/s |
Proper motion (μ) | RA: −19.556 mas/yr[1] Dec.: −39.926 mas/yr[1] |
Parallax (π) | 26.5541 ± 0.0114 mas[1] |
Distance | 122.83 ± 0.05 ly (37.66 ± 0.02 pc) |
Absolute magnitude (MV) | +6.68[6] |
Details | |
Mass | 0.79[7] M☉ |
Radius | 0.80±0.04[8] R☉ |
Luminosity | 0.287±0.005[1] L☉ |
Surface gravity (log g) | 4.52±0.16[9] cgs |
Temperature | 4,840±66[9] K |
Metallicity [Fe/H] | 0.00±0.06[10] dex |
Rotational velocity (v sin i) | 2.6[11] km/s |
Age | 1.52[7] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
HD 63454, formally named Ceibo, is a star located in the southern circumpolar constellation Chamaeleon near the border with Mensa. To see the star, one needs a small telescope because it has an apparent magnitude of 9.36,[2] which is below the limit for naked eye visibility. The object is located relatively close at a distance of 123 light years based on Gaia DR3 parallax measurements[1] but is receding with a heliocentric radial velocity of 33.8 km/s.[5] At its current distance, HD 63454's brightness is diminished by two tenths of a magnitude due to interstellar dust.[13] It has an absolute magnitude of +6.68.[6]
HD 63454 has a stellar classification of K3 V(k),[3] indicating that it is a K-type main-sequence star with some infilling of the calcium K and H lines.[14] It has 79% the mass of the Sun[7] and 80% the Sun's radius.[8] It radiates 28.7% the luminosity of the Sun[1] from its photosphere at an effective temperature of 4,840 K,[9] giving it an orange hue. HD 63454 has a solar metallicity[10] and is estimated to 1.52 billion years old,[7] a third the age of the Sun. It spins modestly with a projected rotational velocity of 2.6 km/s.[11]
On Valentine’s Day 2005, a hot Jupiter HD 63454 b was found by Claire Moutou, Michel Mayor, and François Bouchy using the radial velocity method.[5]
After the 2019 IAU100 NameExoWorlds campaign, the International Astronomical Union, approved the names proposed from Uruguay: Ceibo for the star and Ibirapitá for the planet, respectively after the native Uruguayan tree species Erythrina crista-galli and Peltophorum dubium.[15]
These names were announced on 17 December 2019, at a press conference of the IAU in Paris, together with other 111 sets of exoplanets and host stars.[16] Ceibo and Ibirapitá were proposed by Adrián Basedas, from the Astronomical Observatory of Liceo Nº9, Montevideo, Uruguay, who won the national contest "Nombra Tu Exoplaneta",[17] organized in Uruguay, to name HD 63454 and HD 63454 b.
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
Ibirapitá | ≥0.25±0.01[18] MJ | 0.036[5] | 2.818049±0.000071[19] | 0.0[5] | — | ~1.10[19] RJ |