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Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Cygnus |
Right ascension | 19h 41m 25.34114s [1] |
Declination | +48° 45′ 14.9900″ [1] |
Apparent magnitude (V) | 13.12 [2] |
Characteristics | |
Evolutionary stage | main sequence [1] |
Spectral type | F7V [3] |
B−V color index | +0.33 [2] |
Variable type | δ Scuti [4] |
Astrometry | |
Radial velocity (Rv) | −136±4 [5] km/s |
Proper motion (μ) | RA: −20.900 mas/yr [1] Dec.: −3.693 mas/yr [1] |
Parallax (π) | 0.8344 ± 0.01 mas [1] |
Distance | 3,910 ± 50 ly (1,200 ± 10 pc) |
Details | |
Mass | 1.46 [6] M☉ |
Radius | 1.57±0.07 [7] R☉ |
Luminosity | 12.6 [8] L☉ |
Surface gravity (log g) | 4.22 [8] cgs |
Temperature | 7,590 [8] K |
Metallicity [Fe/H] | −0.1±0.11 [8] dex |
Rotation | ≈100 days [8] |
Rotational velocity (v sin i) | 1 [8] km/s |
Age | 756 [1] Myr |
Other designations | |
Database references | |
SIMBAD | data |
KIC 11145123 (sometimes mistakenly called Kepler 1145123 [9] ), is a white hued star located in the northern constellation Cygnus, the swan. It has an apparent magnitude of 13.12, [2] making it readily visible in large telescopes, but not to the naked eye. The object is located relatively far at a distance of approximately 3,910 light years, [1] but is rapidly approaching the Solar System with a radial velocity of −136 km/s . [5]
KIC 11145123 has a spectral classification of F7V, [3] indicating that it is a main sequence F-type star. Atmospheric models suggest it may be hotter and possibly a late A-type star. [4] It has 1.4 times the mass of the Sun, in contrast to the 1.7 times that would be expected from a normal late A main sequence star, and 1.57 times its radius. [7] It radiates 12 times the luminosity of the Sun from its photosphere at an effective temperature of 7,590 K . [8] Unlike most hot stars, KIC 11145123 spins exceptionally slowly with a projected rotational velocity of 1 km/s . [8] This corresponds to a period of roughly 100 days. [8] Despite appearing as a main sequence star (Gaia DR3 models it as such), [1] it is most likely a blue straggler. [10] [6]
KIC 11145123 is believed to currently be the roundest natural object, with the difference between equatorial and polar radii equaling a mere three kilometers. [9]
WR 7 is a Wolf–Rayet star in the constellation of Canis Major. It lies at the centre of a complex bubble of gas which is shocked and partially ionised by the star's radiation and winds.
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The Tucana-Horologium association (Tuc-Hor), or Tucana Horologium moving group, is a stellar association with an age of 45 ± 4 Myr and it is one of the largest stellar associations within 100 parsecs. The association has a similar size to the Beta Pictoris moving group (BPMG) and contains, like BPMG, more than 12 stars with spectral type B, A and F. The association is named after two southern constellations, the constellation Tucana and the constellation Horologium.
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