LAMOST J112456.61+453531.3

Location of J1124+4535 in the constellation Ursa Major (marked with a red dot)
Observation data Epoch J2000       Equinox J2000
Constellation	Ursa Major
Right ascension	11h 24m 56.6107s
Declination	+45° 35′ 31.3073″
Apparent magnitude (V)	13.979 [1]
Characteristics
B−V color index	0.850 [1]
Astrometry
Proper motion (μ)	RA: −0.857±0.025  mas/ yr Dec.: −6.784±0.031  mas/ yr
Parallax (π)	0.0577 ± 0.0226  mas [2]
Distance	approx. 60,000  ly (approx. 17,000  pc)
Details
Temperature	4897.5 [2]  K
Database references
SIMBAD	data

LAMOST J112456.61+453531.3 (unofficial abbreviation J1124+4535) is a magnitude 13.98 star in the constellation Ursa Major, below the "bowl" of the Big Dipper. ^{[3] [1]} It is located approximately 60,000 light-years from Earth. ^[2]

Initial observations of J1124+4535 by the Large Sky Area Multi-Object Fibre Spectroscopic Telescope showed low amounts of magnesium, and later, the Subaru Telescope confirmed the low amounts of magnesium and also found high amounts of europium. J1124+4535 also lacks the same observable chemical signature as other stars in its parent interstellar cloud, indicating that J1124+4535 did not form in the cloud, confirming that the star must have formed outside the Milky Way. ^[4]

The star's origin was most likely the result of a dwarf galaxy collision with the Milky Way some 5 to 9 billion years ago. The remnants of the destroyed galaxy can still be seen as the most visible streams of the galactic halo. ^{[5] [6]}

References