HD 108147
Star in the constellation of Crux
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HD 108147, also known as Tupã, is a 7th magnitude star in the constellation of Crux in direct line with and very near to the bright star Acrux or Alpha Crucis. It is either a yellow-white or yellow dwarf (the line is arbitrary and the colour difference is only from classification, not real), slightly brighter and more massive than the Sun. The spectral type is F8 V or G0 V. The star is also younger than the Sun. Due to its distance of 127 light-years, it is too dim to be visible with the unaided eye; with binoculars it is an easy target. However, due to its southerly location it is not visible in the northern hemisphere except for the tropics.
Star map shows star position on the southern edge of the constellation Crux | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Crux[1] |
| Right ascension | 12h 25m 46.2674s[2] |
| Declination | −64° 01′ 19.516″[2] |
| Apparent magnitude (V) | 6.994[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | F8/G0V[4] |
| B−V color index | 0.537[5] |
| Astrometry | |
| Radial velocity (Rv) | −5.03±0.13[2] km/s |
| Proper motion (μ) | RA: −182.666 mas/yr[2] Dec.: −60.693 mas/yr[2] |
| Parallax (π) | 25.7587±0.0159 mas[2] |
| Distance | 126.62 ± 0.08 ly (38.82 ± 0.02 pc) |
| Absolute magnitude (MV) | +4.09[1] |
| Details[5] | |
| Mass | 1.27±0.02 M☉ |
| Radius | 1.21[6] R☉ |
| Luminosity | 1.93 L☉ |
| Surface gravity (log g) | 4.59±0.15 cgs |
| Temperature | 6265±40 K |
| Metallicity [Fe/H] | 0.2±0.06 dex |
| Rotation | 8.7 days |
| Rotational velocity (v sin i) | 5.13 km/s |
| Age | 2.17 Gyr |
| Other designations | |
| Tupã, CD−63°757, CPD−63°2270, GC 16944, HIP 60644, LTT 4696, SAO 251899[7] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
An extrasolar planet was detected orbiting it in 2000 by the Geneva Extrasolar Planet Search Team.[8] This exoplanet is "a gas giant smaller than Jupiter that orbits very tightly around its primary [star] in 11 days at only 0.1 AU." This is much closer than the orbit of Mercury in the Solar System.[9]
In December 2019, the International Astronomical Union announced the star will bear the name Tupã, after the God of the Guarani peoples of Paraguay. The name was a result of a contest ran in Paraguay by the Centro Paraguayo de Informaciones Astronómicas, along with the IAU100 NameExoWorlds 2019 global contest.[10]
It should not be confused with HD 107148, which also has an extrasolar planet discovered in 2006 in the Virgo constellation.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination (°) |
Radius |
|---|---|---|---|---|---|---|
| b / Tumearandu | >0.40 MJ | 0.104 | 10.901±0.001 | 0.498±0.025 | — | — |