V1400 Centauri
Sun-like star in the constellation Centaurus / From Wikipedia, the free encyclopedia
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V1400 Centauri (also known as 1SWASP .J140747.93−394542.6, J1407 and Mamajek's Object) is a pre-main-sequence star in the constellation Centaurus at a distance of about 451 light-years from Earth.[5][8] A relatively young star, its age is estimated to be 16 million years, and its mass is about 90% that of the Sun.[3][9] The star has a maximum apparent magnitude of 12.2 and requires a telescope to be seen. The star's name comes from the SuperWASP (Wide Angle Search for Planets) program and the star's coordinates.
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Centaurus |
Right ascension | 14h 07m 47.92976s[1] |
Declination | −39° 45′ 42.7671″[1] |
Apparent magnitude (V) | 12.2 - ~15.6[2] |
Characteristics | |
Evolutionary stage | pre-main sequence[3] |
Spectral type | K5 IV(e) Li[3] |
Variable type | rotational T Tau and eclipsing[2] |
Astrometry | |
Radial velocity (Rv) | 5.65±2.92[1] km/s |
Proper motion (μ) | RA: −23.108±0.015 mas/yr[1] Dec.: −21.048±0.017 mas/yr[1] |
Parallax (π) | 7.2351 ± 0.0140 mas[1] |
Distance | 450.8 ± 0.9 ly (138.2 ± 0.3 pc) |
Details | |
Mass | 0.9[3] M☉ |
Radius | >0.93±0.02[4] R☉ |
Luminosity | 0.34[1] L☉ |
Surface gravity (log g) | 4.30[1] cgs |
Temperature | 4400±100[5] K |
Rotation | 3.21±0.01 d[6] |
Age | 16[3] Myr |
Other designations | |
Database references | |
SIMBAD | data |
In 2007, J1407 was observed to be eclipsed and possibly orbited by at least one major body, 1SWASP J1407b[10] (shortened as J1407b). J1407b is thought to be either a large gas giant planet or a brown dwarf with an immense ring system.[3][5][11] Subsequent observations have not successfully detected J1407b, suggesting that it may be on a highly eccentric orbit around the star.[4] or that it is a rogue object that coincidentally transited V1400 Centauri.
By 2021, it was discovered the parent star is strongly variable, with a 5.4-year long magnetic activity cycle, and no evidence was detected of additional planets or a repeat of the deep eclipses attributed to a transiting ring system.[12]