KIC 11145123

KIC 11145123 (sometimes mistakenly called Kepler 11145123^[10]), is a white hued star located in the northern constellation Cygnus, the swan. It has an apparent magnitude of 13.12,^[3] 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,^[2] but is rapidly approaching the Solar System with a radial velocity of −136 km/s.^[6]

KIC 11145123

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Cygnus[1]
Right ascension	19h 41m 25.34114s[2]
Declination	+48° 45′ 14.9900″[2]
Apparent magnitude (V)	13.12[3]
Characteristics
Evolutionary stage	main sequence[2]
Spectral type	F7V[4]
B−V color index	+0.33[3]
Variable type	δ Scuti[5]
Astrometry
Radial velocity (Rv)	−136±4[6] km/s
Proper motion (μ)	RA: −20.900 mas/yr[2] Dec.: −3.693 mas/yr[2]
Parallax (π)	0.8344±0.01 mas[2]
Distance	3,910 ± 50 ly (1,200 ± 10 pc)
Details
Mass	1.46[7] M☉
Radius	1.57±0.07[8] R☉
Luminosity	12.6[9] L☉
Surface gravity (log g)	4.22[9] cgs
Temperature	7,590[9] K
Metallicity [Fe/H]	−0.1±0.11[9] dex
Rotation	≈100 days[9]
Rotational velocity (v sin i)	1[9] km/s
Age	756[2] Myr
Other designations
KIC 11145123, 2MASS J19412534+4845150
Database references
SIMBAD	data

Characteristics

KIC 11145123 has a spectral classification of F7V,^[4] indicating that it is a main sequence F-type star. Atmospheric models suggest it may be hotter and possibly a late A-type star.^[5] 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.^[8] It radiates 12 times the luminosity of the Sun from its photosphere at an effective temperature of 7,590 K.^[9] Unlike most hot stars, KIC 11145123 spins exceptionally slowly with a projected rotational velocity of 1 km/s.^[9] This corresponds to a period of roughly 100 days.^[9] Despite appearing as a main sequence star (Gaia DR3 models it as such),^[2] it is most likely a blue straggler.^[11][7]

Roundest natural object

KIC 11145123 is currently believed be the roundest natural object, with the difference between equatorial and polar radii equaling a mere three kilometers.^[10]