HD 60532
Star in the constellation Puppis
From Wikipedia, the free encyclopedia
HD 60532, also known as Gliese 279, is a star with two orbiting exoplanets in the southern constellation of Puppis. The designation HD 60532 takes its name from the Henry Draper Catalogue. It is #279 in the Gliese Catalogue of Nearby Stars. The system is located at a distance of 85.5 light years from the Sun, and is drifting further away with a radial velocity of 61 km/s.[5] At that distance, the star has an apparent visual magnitude of 4.45,[2] which is bright enough to be faintly visible to the naked eye. The motion of this system through space brought it within 10.3 light-years of the Sun some 408,600 years ago.[11]
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Puppis |
| Right ascension | 07h 34m 03.181s[1] |
| Declination | −22° 17′ 45.84″[1] |
| Apparent magnitude (V) | 4.450[2] |
| Characteristics | |
| Spectral type | F6 IV-V[3] |
| U−B color index | +0.07[4] |
| B−V color index | +0.51[4] |
| Astrometry | |
| Radial velocity (Rv) | +61.042±0.0004[5] km/s |
| Proper motion (μ) | RA: −40.180 mas/yr[1] Dec.: +46.791 mas/yr[1] |
| Parallax (π) | 38.1379±0.1087 mas[1] |
| Distance | 85.5 ± 0.2 ly (26.22 ± 0.07 pc) |
| Absolute magnitude (MV) | 2.40[2] |
| Details | |
| Mass | 1.44+0.03 −0.1[6] M☉ |
| Radius | 2.66±0.03[7] R☉ |
| Luminosity | 9.3±0.1[7] L☉ |
| Surface gravity (log g) | 3.75±0.02[7] cgs |
| Temperature | 6,095[6] K |
| Metallicity [Fe/H] | −0.42[6] dex |
| Rotational velocity (v sin i) | 8[6] km/s |
| Age | 2.7±0.1[6] Gyr |
| Other designations | |
| 108 G. Puppis, BD−21°2007, GC 10134, GJ 279, HIP 36795, HR 2906, SAO 174009, 2MASS J07340317-2217457[8][9][10] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| ARICNS | data |
The spectrum of this star shows blended features of an F-type main-sequence star and an evolving subgiant star, with a corresponding stellar classification of F6 IV-V.[3] It is an estimated 2.7 billion years old with a projected rotational velocity of 8 km/s and a low level of magnetic activity in its chromosphere.[6] The star has 1.44[6] times the mass of the Sun and 2.66 times the Sun's radius.[7] The abundance of iron, a measure of the star's metallicity, is 38% that of the Sun.[6] HD 60532 is radiating 9.3[7] times the luminosity of the Sun from its photosphere at an effective temperature of 6,095 K.[6]
Planetary system
In September 2008, two Jupiter-like planets, components b and c, were found orbiting the star, by Desort et al at the La Silla Observatory.[6] The orbital periods of these two planets appear to be in 3:1 resonance.[12] However, their inclination is still unknown and therefore their radii cannot be calculated.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥1.06±0.08 MJ | 0.77±0.02 | 201.9±0.3 | 0.26±0.02 | — | — |
| c | ≥2.51±0.16 MJ | 1.60±0.04 | 600.1±2.4 | 0.03±0.02 | — | — |