16h28m28.1513s, −13° 23′ 58.704″| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Ophiuchus |
| Right ascension | 16h28m 28.151s[1] |
| Declination | –13° 23′ 58.69″[1] |
| Apparent magnitude (V) | 6.903 |
| Characteristics | |
| Spectral type | K0IV |
| Apparent magnitude (B) | 7.839 |
| Apparent magnitude (J) | 5.299 |
| Apparent magnitude (H) | 4.875 |
| Apparent magnitude (K) | 4.682 |
| B−V color index | 0.936 |
| Astrometry | |
| Proper motion (μ) | RA: –37.74 ± 0.76[1] mas/yr Dec.: 2.81 ± 0.51[1] mas/yr |
| Parallax (π) | 16.94 ± 0.60 mas[1] |
| Distance | 193 ± 7 ly (59 ± 2 pc) |
| Absolute magnitude (MV) | 3.039 |
| Orbit | |
| Primary | HD 148427 |
| Companion | HD 148427 b |
| Period (P) | 331.5 ± 3.0 d (0.9076 yr) |
| Semi-major axis (a) | 0.93 ± 0.01 AU |
| Eccentricity (e) | 0.16 ± 0.08 |
| Inclination (i) | 0.5120+0.1635 −0.1082° |
| Details | |
| HD 148427 | |
| Mass | 1.45 ± 0.06 M☉ |
| Radius | 3.22 ± 0.2 R☉ |
| Luminosity | 6.06 L☉ |
| Surface gravity (log g) | 3.75 cgs |
| Temperature | 5052 ± 44 K |
| Metallicity [Fe/H] | 0.154 ± 0.04 dex |
| Age | 2.5 Gyr |
| HD 148427 b | |
| Mass | 136.5+37.2 −33.7 MJup |
| Other designations | |
| HD 148427: Timir | |
| HD 148427 b: Tondra | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HD 148427, formally named Timir,[2] is a 7th-magnitude K-type subgiant star approximately 193 light years away in the constellation Ophiuchus. Its mass is 45% greater than the Sun, and it is three times the size and six times more luminous, although its age is 2½ billion years.
In August 2009, it was found to have a companion in orbit (HD 148427 b or Tondra) with a minimum massof0.96 MJ and an orbital period of 331.5 days.[3] In 2020, this object's inclination was measured, revealing its true mass to be between 27 and 345 MJ. This makes it either a brown dwarf or a low-mass red dwarf star.[4]
HD 148427, and HD 148427 b (thought at the time to be an exoplanet), were chosen as part of the 2019 NameExoWorlds campaign organised by the International Astronomical Union, which assigned each country a star and planet to be named. HD 148427 was assigned to Bangladesh. The winning name for the star was Timir meaning darkness in the Bengali language, alluding to the star being far away in the darkness of space. The winning name for the companion was Tondra meaning nap in the Bengali language, alluding to the symbolic notion that the object was asleep until discovered.[5]
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