LAMOST J112456.61+453531.3
Star in the constellation Ursa Major
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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]
  Location of J1124+4535 in the constellation Ursa Major (marked with a red dot) | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| 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 |
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]