Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aquarius |
Right ascension | 23h 41m 51.5301s |
Declination | –05° 59′ 08.729″ |
Apparent magnitude (V) | 7.685±0.005 |
Characteristics | |
HD 222582A | |
Evolutionary stage | Main sequence |
Spectral type | G5V |
B−V color index | 0.648±0.002 |
HD 222582B | |
Spectral type | M4.5V |
Astrometry | |
Radial velocity (Rv) | +12.020±0.0004 km/s |
Proper motion (μ) | RA: −145.492(29) mas/yr Dec.: −111.458(21) mas/yr |
Parallax (π) | 23.7955 ± 0.0238 mas |
Distance | 137.1 ± 0.1 ly (42.02 ± 0.04 pc) |
Absolute magnitude (MV) | 4.44±0.12 |
Position (relative to HD 222582A) | |
Component | HD 222582B |
Epoch of observation | 2018 |
Angular distance | 109.56±0.18″ |
Position angle | 299.52±0.03° |
Projected separation | 4637±59 AU AU |
Details | |
A | |
Mass | 0.993±0.035 M☉ |
Radius | 1.137±0.017 R☉ |
Luminosity | 1.302+0.005 −0.004 L☉ |
Surface gravity (log g) | 4.370±0.009 cgs |
Temperature | 5,790±3 K |
Metallicity | −0.005±0.003 dex |
Rotational velocity (v sin i) | 1.74±0.12 km/s |
Age | 6.7±0.3 Gyr |
Ba+Bb | |
Mass | 0.2 M☉ |
Other designations | |
BD−06°6262, GC 32912, HD 222582, HIP 116906, SAO 146849, WDS J23419-0559A, NLTT 57682, 2MASS J23415154-0559086 | |
Database references | |
SIMBAD | data |
Planet | |
HD 222582 b | Data Simbad |
Data ExoPlanet |
HD 222582 is a multiple star system in the equatorial constellation of Aquarius. It is invisible to the naked eye with an apparent visual magnitude of 7.7, but can be viewed with binoculars or a small telescope. The system is located at a distance of 137 light years from the Sun based on parallax, and it is drifting further away with a radial velocity of +12 km/s. It is located close enough to the ecliptic that it is subject to lunar occultations.
The primary member of this system, designated component A, is an ordinary G-type main-sequence star with a stellar classification of G5V. The physical properties of the star are similar enough to the Sun that it is considered a candidate solar twin. It is about 6.5 billion years old with an inactive chromosphere and is spinning with a low projected rotational velocity of 1.7 km/s. The mass and metallicity of this star are essentially the same as the Sun. It has a 14% larger radius and is radiating 1.3 times the luminosity of the Sun from its photosphere at an effective temperature of 5,790 K.
Component B of this system is a close binary system with the components designated HD 222582 Ba and Bb. The pair have a combined class of M4.5 V+ and about 20% the mass of the Sun.
In November 1999, a dense superjovian planet was announced orbiting the primary by the California and Carnegie Planet Search. Designated component 'b', it was discovered using the radial velocity method, using 24 observations over a period of 1.5 years. The exoplanet is orbiting with a period of 1.57 years and a very large eccentricity of 0.76, ranging in distance from 0.39 AU out to 2.31 AU away from the primary.
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | 8.37 MJ | 1.35 | 572 | 0.76 | — | — |
Constellation of Aquarius | |||||||||||||
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