30 Arietis
File:30 Ari hiérarchie.png 30 Arietis star system hierarchy | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aries |
| 30 Arietis A | |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| 30 Arietis B | |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Characteristics | |
| Spectral type | F5 V / F6 V[3] |
| B−V Template:Engvar | 0.410 / 0.510[3] |
| Astrometry | |
| 30 Arietis A | |
| Proper motion (μ) | RA: Script error: No such module "val".[1] mas/yr Dec.: Script error: No such module "val".[1] mas/yr |
| Parallax (π) | 22.1261±0.0726 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| 30 Arietis B | |
| Proper motion (μ) | RA: Script error: No such module "val".[2] mas/yr Dec.: Script error: No such module "val".[2] mas/yr |
| Parallax (π) | 22.3641±0.0516 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Orbit[4][5] | |
| Primary | 30 Arietis A |
| Companion | 30 Arietis BC |
| Period (P) | 34000 yr |
| Semi-major axis (a) | 40" (1670 AU) |
| Orbit[5] | |
| Primary | 30 Arietis B |
| Companion | 30 Arietis C |
| Period (P) | 80 yr |
| Semi-major axis (a) | 22.3 AU |
| Orbit[5] | |
| Primary | 30 Arietis B |
| Companion | 30 Arietis Bb |
| Period (P) | 335.1 ± 2.5 d (0.917 ± 0.007 yr) |
| Semi-major axis (a) | 0.995 ± 0.012 AU |
| Eccentricity (e) | 0.289 ± 0.092 |
| Inclination (i) | Script error: No such module "val".°[6]° |
| Details | |
| 30 Arietis A | |
| Mass | 1.31 ± 0.04[3] Template:Solar mass |
| Radius | 1.37 ± 0.03[3] Template:Solar radius |
| Age | Script error: No such module "val".[5] Myr |
| 30 Arietis Ba | |
| Mass | 1.16 ± 0.04[3] Template:Solar mass |
| Radius | 1.13 ± 0.03[3] Template:Solar radius |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Age | Script error: No such module "val".[5] Myr |
| Details | |
| 30 Arietis Bb | |
| Mass | Script error: No such module "val".[6] MJup |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| CCDM 02370+2439, WDS 02370+2439 30 Arietis A BD+24°375, HD 16232, HIP 12184, HR 764, SAO 75470 | |
| Database references | |
| SIMBAD | A |
| B | |
| Exoplanet Archive | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) | |
Script error: No such module "Check for unknown parameters".
30 Arietis (abbreviated 30 Ari) is a 6th-apparent-magnitude multiple star system[4] in the constellation of Aries. 30 Arietis is the Flamsteed designation. 30 Arietis A and B are separated by Script error: No such module "val". or about Script error: No such module "val". at a distance of 130 light years away. The main components of both systems are both binaries with a composite spectra belonging to F-type main-sequence stars, meaning they are fusing hydrogen in their cores. The 30 Arietis system is 910 million years old, one fifth the age of the Sun.
Star system
30 Arietis A and B are separated by 38.1", corresponding to 1,500 AU at a distance of 130 light years. The pair are at almost the same distance, have very similar proper motions, and are considered almost certain to be gravitationally bound with a likely period around 34,000 years.[5] The main components of both systems are both binaries with a composite spectra belonging to F-type main-sequence stars, meaning they are fusing hydrogen in their cores.[3]
30 Arietis A is a spectroscopic binary with an orbital period of 1.1 days.[7] The primary Aa is an F-type main sequence star about 31% more massive than the Sun, while the companion Ab is a faint red dwarf only about 15% the mass of the Sun.
30 Arietis B has been reported to have a red dwarf companion at a distance of Script error: No such module "val".[5] and another red dwarf Bb at about Script error: No such module "val"..[3] In 2020, after the inclination of the planetary orbit was measured, the "planet" was found to fall in the mass range of a brown or red dwarf.[6] The more distant companion was referred to as C to distinguish it from Bb, and at about 0.5" it has been imaged using adaptive optics.[5]
30 Arietis Bb
30 Arietis Bb (sometimes abbreviated 30 Ari Bb) is a red dwarf which orbits the F-type main sequence star 30 Arietis Ba, located in a quintuple star system approximately 146 light years away in the constellation Aries. The red dwarf, initially believed to be a massive planet or brown dwarf, was announced in a paper published online on September 24, 2009. It was discovered by using precision radial velocity measurements from the echelle spectrograph installed on the Alfred-Jensch telescope in Karl Schwarzschild Observatory.[3] The star had a minimum mass of nearly 10 times that of Jupiter.[8] In 2020, after the inclination of the planetary orbit was measured to be just 4.14Script error: No such module "Su".°, the "planet" was found to fall in the mass range of red dwarf stars.[6]
See also
References
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- ↑ a b c d e Template:Cite Gaia DR2
- ↑ a b c d e Template:Cite Gaia DR2
- ↑ a b c d e f g h i Script error: No such module "Citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ a b c d e f g h Script error: No such module "Citation/CS1".
- ↑ a b c d Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "citation/CS1".
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External links
- Image 30 Arietis
- Double stars
- NASA diagram of the 30 Ari System Script error: No such module "webarchive".
