External links
- "Notes for star HD 63454". Extrasolar Planets Encyclopaedia . Archived from the original on 6 November 2007. Retrieved 22 August 2008.
| 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) | +33.61±0.15 [1] 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 [5] |
| Details | |
| Mass | 0.79 [6] M☉ |
| Radius | 0.80±0.04 [7] R☉ |
| Luminosity | 0.287±0.005 [1] L☉ |
| Surface gravity (log g) | 4.52±0.16 [8] cgs |
| Temperature | 4,840±66 [8] K |
| Metallicity [Fe/H] | 0.00±0.06 [9] dex |
| Rotational velocity (v sin i) | 2.6 [10] km/s |
| Age | 1.52 [6] Gyr |
| Other designations | |
| Ceibo, CD−77°298, CPD−77°324, HD 63454, HIP 37284, TYC 9385-1045-1 [11] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | 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 . [12] 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. [5]
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 [6] and 80% the Sun's radius. [7] It radiates 28.7% the luminosity of the Sun [1] from its photosphere at an effective temperature of 4,840 K , [8] giving it an orange hue. HD 63454 has a solar metallicity [9] and is estimated to 1.52 billion years old, [6] a third the age of the Sun. It spins modestly with a projected rotational velocity of 2.6 km/s . [10]
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. [12]
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 [12] | 2.818049±0.000071 [19] | 0.0 [12] | — | ~1.10 [19] RJ |
