Mu Arae
 Mu Arae |
|
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Ara |
| Right ascension | 17h 44m 08.70114s |
| Declination | −51° 50′ 02.5853″ |
| Apparent magnitude (V) | +5.12 |
| Characteristics | |
| Spectral type | G3IV–V |
| U−B color index | +0.24 |
| B−V color index | +0.70 |
| R−I color index | 0.2 |
| Astrometry | |
| Radial velocity (Rv) | −9.0 km/s |
| Proper motion (μ) |
RA: −16.85 mas/yr Dec.: −190.60 mas/yr |
| Parallax (π) | 64.47 ± 0.31mas |
| Distance | 50.6 ± 0.2 ly (15.51 ± 0.07 pc) |
| Absolute magnitude (MV) | +4.28 |
| Details | |
| Mass | 1.10 ± 0.01 M☉ |
| Radius | 1.36 ± 0.01 R☉ |
| Luminosity | 1.90 ± 0.10 L☉ |
| Surface gravity (log g) | 4.19 cgs |
| Temperature | 5820 ± 40 K |
| Metallicity | 200 ± 5% |
| Metallicity [Fe/H] | 0.30 ± 0.01 dex |
| Rotation | 31 days |
| Rotational velocity (v sin i) | 1.4 km/s |
| Age | 6.34 ± 0.40 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| ARICNS | data |
| Extrasolar Planets Encyclopaedia |
data |
Mu Arae (μ Arae, abbreviated Mu Ara, μ Ara), often designated HD 160691, also named Cervantes, is a main sequence G-type star approximately 50 light-years away from the Sun in the constellation of Ara. The star has a planetary system with four known extrasolar planets (designated Mu Arae b, c, d and e; later named Quijote, Dulcinea, Rocinante and Sancho, respectively), three of them with masses comparable to that of Jupiter. The system's innermost planet was the first 'hot Neptune' or 'super-Earth' to be discovered.
μ Arae (Latinised to Mu Arae) is the star's Bayer designation. HD 160691 is the entry in the Henry Draper Catalogue.
The established convention for extrasolar planets is that the planets receive designations consisting of the star's name followed by lower-case Roman letters starting from "b", in order of discovery. This system was used by a team led by Krzysztof Goździewski. On the other hand, a team led by Francesco Pepe proposed a modification of the designation system, where the planets are designated in order of characterization. Since the parameters of the outermost planet were poorly constrained before the introduction of the 4-planet model of the system, this results in a different order of designations for the planets in the Mu Arae system. Both systems agree on the designation of the 640-day planet as "b". The old system designates the 9-day planet as "d", the 310-day planet as "e" and the outer planet as "c". Since the International Astronomical Union has not defined an official system for designations of extrasolar planets, the issue of which convention is 'correct' remains open, however subsequent scientific publications about this system appear to have adopted the Pepe et al. system, as has the system's entry in the Extrasolar Planets Encyclopaedia.
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