  | |
| Observation data Epoch J2000.0[1] Equinox J2000.0[1] | |
|---|---|
| Constellation | Leo |
| Right ascension | 11h 04m 44.45485s[1] |
| Declination | −02° 30′ 47.5901″[1] |
| Apparent magnitude (V) | 8.254[1] |
| Characteristics | |
| Evolutionary stage | red giant branch[2] |
| Spectral type | K0[citation needed] |
| B−Vcolor index | 0.836[1] |
| Astrometry | |
| Radial velocity (Rv) | −1.18[1] km/s |
| Proper motion (μ) | RA: 27.824[1]mas/yr Dec.: −17.902[1]mas/yr |
| Parallax (π) | 7.1787±0.028 mas[1] |
| Distance | 454 ± 2 ly (139.3 ± 0.5 pc) |
| Absolute magnitude (MV) | +2.26[3] |
| Details | |
| Mass | 1.37[4] M☉ |
| Radius | 4.75,[4]3.33±0.45[5] R☉ |
| Luminosity | 8.91+3.97 −2.75[5] L☉ |
| Surface gravity (log g) | 3.33[4] cgs |
| Temperature | 5,020[4] K |
| Metallicity [Fe/H] | −0.10±0.14[6] dex |
| Rotational velocity (v sin i) | 1.71±0.26,[5]0.870±0.500[7] km/s |
| Age | 2.92±0.81[5] Gyr |
| Other designations | |
| AG−02°638,BD−01°2476,Gaia DR2 3791263156547622784,GC 15229,HD 96063,HIP 54158,SAO 137979,PPM 178377,TYC 4924-460-1,GSC 04924-00460,2MASS J11044445-0230475[1] | |
| Database references | |
| SIMBAD | data |
HD 96063 (proper nameDingolay) is a 8th-magnitudered-giant branch star located about 454 light-years (139 pc) away in the constellation ofLeo. It is orbited by one confirmedexoplanet, HD 96063 b (proper nameRamajay), agas giant slightly larger and more massive thanJupiter.[7]
In 2019, theRepublic of Trinidad and Tobago was assigned to giving the HD 96063 system a proper name as part of theIAU100 NameExoWorlds Project, planned to celebrate the hundredth anniversary of theInternational Astronomical Union (IAU), which grants the right to name an exoplanetary system to every state and territory in the world.[8] Names were submitted and selected within Trinidad and Tobago, which were then presented to the IAU to be officially recognized.[9] On 17 December 2019, the IAU announced that HD 96063 and its planet, b, were named Dingolay and Ramajay, respectively.[10]
The two names are both derived from terms related to theTrinidad and Tobago Carnival. Dingolay is a dance form that represents the culture and language of Trinidad and Tobago's ancestors via intricate movements. Ramajay is asteelpan style of singing and music that celebrates Trinidad and Tobago's forefathers' culture and language.[10]
HD 96063 is an evolved yellow/orange star with aneffective temperature of about5,000 K,[4] typical of stars entering thered-giant branch. Its precise nature, however, has been controversial. Once classified as a G6-typemain-sequence star,[11] the star is more recently thought to be a K-type "yellow giant,"[12][13] somewhere between three and five times as large as the Sun.[5][4] When the planet HD 96063 b was discovered, the star was assumed to be9.0±3.0 billion years old with asun-like mass (1.020±0.072M☉),[7] but subsequent studies consider it to be more massive at about 1.4M☉, and thus younger (2.92±0.81 Gyr).[5] With aluminosity roughly ten times that of the Sun and a distance of 454 light-years, the star has anapparent magnitude of 8.254, too faint to be seen from Earth by the naked eye.[6][1]
In 2011,radial-velocity observations made at theW. M. Keck Observatory revealed the existence of an exoplanet around HD 96063.[7] The planet, HD 96063 b, is thought to be agas giant at least 1.265 times the mass ofJupiter, which orbits its host star at a distance of 1.11AU with anEarth-like period of 362 days. Its orbit is moderately eccentric, with an eccentricity comparable to that of planetMercury (0.2056).[4][14]
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b (Ramajay) | ≥ 1.265 MJ | 1.11 | 362.518±2.162 | 0.168±0.107 | — | 1.242 RJ |
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