HD 143361
Star in the constellation Norma
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HD 143361 is a star in the southern constellation Norma. With an apparent visual magnitude of 9.20,[2] this star is too dim to be seen with the naked eye. It is close enough to the Earth that its distance can be determined using parallax measurements, yielding a value of 224 light-years (69 parsecs).[1]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Norma |
| Right ascension | 16h 01m 50.34828s[1] |
| Declination | −44° 26′ 04.3434″[1] |
| Apparent magnitude (V) | 9.20[2] |
| Characteristics | |
| Spectral type | G6 V[3] |
| Apparent magnitude (B) | ~9.93[4] |
| Apparent magnitude (V) | ~9.16[4] |
| Apparent magnitude (J) | 7.905 ± 0.026[5] |
| Apparent magnitude (H) | 7.572 ± 0.038[5] |
| Apparent magnitude (K) | 7.488 ±0.018[5] |
| B−V color index | 0.773[2] |
| Astrometry | |
| Radial velocity (Rv) | −0.56±0.16[1] km/s |
| Proper motion (μ) | RA: −156.561 mas/yr[1] Dec.: −120.231 mas/yr[1] |
| Parallax (π) | 14.5456±0.0202 mas[1] |
| Distance | 224.2 ± 0.3 ly (68.75 ± 0.10 pc) |
| Details | |
| Mass | 0.93[6] M☉ |
| Temperature | 5,420[7] K |
| Metallicity [Fe/H] | 0.06[2] dex |
| Age | 8.1[7] Gyr |
| Other designations | |
| CD–44 10569, HD 143361, HIP 78521, SAO 226454. | |
| Database references | |
| SIMBAD | data |
This is a G-type main sequence star with a stellar classification of G6 V.[3] It has around 95% of the Sun's mass and is around 8.1[7] billion years old.
HD 143361 is part of a binary star system. A red dwarf star has a similar distance and similar proper motions with the primary. Its orbit is very wide, as the angular separation of 33 arcminutes translates to a projected separation of 135,000 AU (2.13 light-years).[8]
Planetary system
In October 2008 the exoplanet HD 143361 b was reported to be orbiting this star. This object was detected using the radial velocity method during an astronomical survey conducted by the Magellan Planet Search Program using the MIKE echelle spectrograph on the 6.5-m Magellan II (Clay) telescope.[6] In 2023, the inclination and true mass of HD 143361 b were determined via astrometry.[9]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (years) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 4.35+1.2 −0.66 MJ |
1.994±0.018 | 2.8538+0.0031 −0.003 |
0.1938+0.0047 −0.0046 |
55+22 −15 or 125+15 −22° |
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