HATS-70
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Canis Major[1] |
| Right ascension | 07h 16m 25.08800s[2] |
| Declination | −31° 14′ 39.8583″[2] |
| Apparent magnitude (V) | 12.23[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | A[4] |
| Astrometry | |
| Proper motion (μ) | RA: -2.396 mas/yr[2] Dec.: +2.443 mas/yr[2] |
| Parallax (π) | 0.7504±0.0133 mas[2] |
| Distance | 4,350 ± 80 ly (1,330 ± 20 pc) |
| Details[4] | |
| Mass | 1.78±0.12 M☉ |
| Radius | 1.881+0.059 −0.066 R☉ |
| Luminosity | 12.0+5.5 −3.4 L☉ |
| Surface gravity (log g) | 4.167+0.044 −0.036 cgs |
| Temperature | 7,930+630 −820 K |
| Metallicity [Fe/H] | 0.041+0.095 −0.107 dex |
| Rotational velocity (v sin i) | 40.61+0.32 −0.35 km/s |
| Age | 0.81+0.50 −0.33 Gyr |
| Other designations | |
| HATS-70, TOI-1916, TIC 98545929, TYC 7103-114-1, 2MASS J07162509-3114397[3] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HATS-70 is a single star in the constellation of Canis Major at a distance of approximately 4,350 light-years (1,330 parsecs) from the Sun. The apparent magnitude of the star is +12.23, meaning it is much too faint to be visible to the naked eye. The age of the star is about 810 million years and it has one planet in its orbit.
Characteristics
[edit]HATS-70 is an A-type main-sequence star, with a mass 1.78 times larger than the Sun's mass, 1.88 times the radius, and 12 times the luminosity. It has an effective temperature of 7,930 K (7,660 °C; 13,810 °F). It is a rapidly rotating star with measurable oblateness.[4]
Planetary system
[edit]In 2018, a group of astronomers working as part of the HATSouth project announced the discovery of a massive planet or brown dwarf around this star, HATS-70b. This object's mass is close to the deuterium fusion limit, and the discovery paper refers to it as a brown dwarf. It is in a close orbit with a period of less than two days, with an obliquity of 13.2°+6.4°
−5.9° (or 160.4°+5.4°
−5.2°) to the star's equator.[4]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 12.9+1.8 −1.6 MJ |
0.03632+0.00074 −0.00087 |
1.8882378(15) | <0.18 | 86.7+1.6 −1.9° |
1.384+0.079 −0.074 RJ |
References
[edit]- ^ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
- ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b "HATS-70". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 13 September 2025.
- ^ a b c d e Zhou, G.; Bakos, G. Á.; et al. (January 2019). "HATS-70b: A 13 MJ Brown Dwarf Transiting an A Star". The Astronomical Journal. 157 (1): 31. arXiv:1811.06925. Bibcode:2019AJ....157...31Z. doi:10.3847/1538-3881/aaf1bb.
