BD+00 316
F-class main sequence star in the constellation Cetus From Wikipedia, the free encyclopedia
BD+00 316 is an ordinary star with a close-orbiting planetary companion in the equatorial constellation of Cetus. It is also known as WASP-71 since 2019;[3] BD+00 316 is the stellar identifier from the Bonner Durchmusterung catalogue. With an apparent visual magnitude of 10.56,[2] it is too faint to be visible to the naked eye. This star is located at a distance of 1,160 light-years based on parallax measurements, and is drifting further away with a heliocentric radial velocity of 7.7 km/s.[4]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cetus |
| Right ascension | 01h 57m 03.204s[1] |
| Declination | 00° 45′ 31.88″[1] |
| Apparent magnitude (V) | 10.56[2] |
| Characteristics | |
| Spectral type | F8[3] |
| B−V color index | 0.896[2] |
| Astrometry | |
| Radial velocity (Rv) | 7.690±0.004[4] km/s |
| Proper motion (μ) | RA: 23.418 mas/yr[1] Dec.: −6.844 mas/yr[1] |
| Parallax (π) | 2.8158±0.0265 mas[1] |
| Distance | 1,160 ± 10 ly (355 ± 3 pc) |
| Details[5] | |
| Mass | 1.53+0.07 −0.06 M☉ |
| Radius | 2.17+0.18 −0.10 R☉ |
| Surface gravity (log g) | 3.944+0.036 −0.050 cgs |
| Temperature | 6,050±100 K |
| Metallicity [Fe/H] | 0.15±0.07 dex |
| Rotational velocity (v sin i) | 7.8±0.3 km/s |
| Age | 3.6+1.6 −1.0 Gyr |
| Other designations | |
| Mpingo, BD+00 316, Gaia DR2 2507901914613005056, WASP-71, TYC 30-116-1, 2MASS J01570320+0045318[6] | |
| Database references | |
| SIMBAD | 436 data |
This is classified as an F-type star with a stellar classification of F8.[3] It is more than double the diameter of the Sun with 1.5 times the Sun's mass. The star is younger than the Sun at about 3.6 billion years,[5] yet is already evolving away from the main sequence.[3] BD+00 316 is enriched in heavy elements, having 140% of the solar abundance of iron.[5] Imaging surveys in 2015 and 2020 failed to find any stellar companions for BD+00 316.[7][8]
The star was named Mpingo by Tanzanian amateur astronomers in 2020 as part of the NameExoWorlds contest, after the mpingo tree (Dalbergia melanoxylon) whose wood is a type of ebony used in musical instruments.[9]
Planetary system
In 2012 a transiting superjovian planet, designated component b, was detected on a tight, circular orbit.[3] The planetary orbit is well aligned with the equatorial plane of the star, the misalignment angle being equal to −1.9+7.1
−7.5°.[5] Its equilibrium temperature is 2,016.1+67.0
−52.5 K.[5]
The planet was named Tanzanite by Tanzanian amateur astronomers in 2020 as part of the NameExoWorlds contest, after the mineral also known as tanzanite.[9]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b (Tanzanite) | 2.14±0.08 MJ | 0.0460±0.0006 | 2.903676±0.000008 | <0.019[10] | 85.8+2.4 −2.1° |
1.35+0.13 −0.07 RJ |
References
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