HD 3167
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pisces |
| Right ascension | 00h 34m 57.524s[1] |
| Declination | +04° 22′ 53.28″[1] |
| Apparent magnitude (V) | 8.97[2] |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | K0 V[3] |
| B−V color index | 0.827±0.021 |
| Variable type | Constant[2] |
| Absolute magnitude (MV) | 5.67[2] |
| Details Gyr | |
| Database references | |
| SIMBAD | data |
HD 3167 is a single,
This is an ordinary
In October 2021, astronomers reported that the orbits of the detected exoplanets hosted by the star are oddly unusual: two planets (HD 3167 c; HD 3167 d) revolve around the star on polar orbits, i.e. orbits that pass over the poles of the star, whereas the third planet (HD 3167 b) orbits around the equator of the star instead.[11][12]
Planetary system
In 2016, data collected during the extended K2 mission of the
The close-orbiting body HD 3167 b has a mass of 5.02
The second planet, HD 3167 c, has an orbital period of 29.8454 days and an eccentricity of less than 0.267. The semimajor axis is 0.1795 AU. It has 9.80 ME and 3.01 R🜨, giving it a low bulk density of 1.97+0.94
−0.59
The orbital inclination of HD 3167 d is inclined at least 1.3° away from the orbital planes of the other two exoplanets. Its orbit is expected to remain stable for periods longer than 100 million years only if this inclination is less than 40°. It has an orbital period of 8.509±0.045 d, placing it in between the other two orbits, and shows a minimum mass of 6.90 ME. The true mass is most likely less than Neptune.[5]
A fourth planet, HD 3167 e, was discovered in 2022 by the radial-velocity method.[15]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 4.97+0.24 −0.23 M🜨 |
0.01796+0.00037 −0.00031 |
0.959641±0.000011 | 0 (fixed) | 83.4+4.6 −7.7° |
1.67+0.17 −0.10 R🜨 |
| d | ≥4.33±0.45 M🜨 | 0.0763±0.0015 | 8.4112±0.0052 | <0.12 | — | — |
| c | 11.13+0.78 −0.74 M🜨 |
0.1776+0.0037 −0.0031 |
29.8454±0.0012 | <0.060 | 89.3+0.5 −1.0° |
3.00+0.45 −0.21 R🜨 |
| e | ≥8.41±1.02 M🜨 | 0.3885±0.0079 | 96.63±0.29 | <0.15 | — | — |
References
- ^ S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ S2CID 119257644.
- ^ Bibcode:1999MSS...C05....0H.
- ^ S2CID 41001644, L9.
- ^ S2CID 54196245, 122.
- ^ S2CID 261556620.
- ^ "HD 3167". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 6, 2018.
- ^ Anderson, Natali (June 11, 2017), "HD 3167d: New Super-Earth Discovered around Nearby Star", Science News, Sci-News.com, retrieved October 7, 2018.
- ^ Nowakowski, Tomasz (July 20, 2016), "Two super-Earth-sized planets discovered orbiting a nearby star", Phys.org, Science X Network, retrieved October 7, 2018.
- S2CID 2603568.
- ^ O'Callaghan, Jonathan (6 November 2021), "Star System With Right-Angled Planets Surprises Astronomers - Two planets orbit the poles while another revolves around the star's equator, suggesting a mysterious, undetected force", The New York Times, retrieved 7 November 2021.
- doi:10.1051/0004-6361/202141527.)
{{citation}}: CS1 maint: multiple names: authors list (link - ^ S2CID 43466609, 123.
- S2CID 226278240.
- S2CID 251861892
