Tucana IV
| Tucana IV | |
|---|---|
| Observation data | |
| Constellation | Tucana |
| Distance | 156,555 ly |
| Group or cluster | Milky Way subgroup |
| Characteristics | |
| Type | Dwarf galaxy |
| Notable features | Close pass of the LMC |
Tucana IV is an ultra-faint dwarf galaxy that is a satellite to the Milky Way galaxy. It lies at a distance of 48 kiloparsecs in the constellation of Tucana. It has a size of 127 parsecs.[1]
It passed within 4 kiloparsecs (possibly a collision event) with the Large Magellanic Cloud (LMC) approximately 120 million years ago. This close passage of the LMC altered the trajectory of the galaxy and its internal kinematics.[2]
Reference
- ^ "Tucana IV". New Planetarium. Retrieved 2025-07-28.
- ^ Simon, J. D.; Li, T. S.; Erkal, D.; Pace, A. B.; Drlica-Wagner, A.; James, D. J.; Marshall, J. L.; Bechtol, K.; Hansen, T. (2020-02-20), "Birds of a Feather? Magellan/IMACS Spectroscopy of the Ultra-faint Satellites Grus II, Tucana IV, and Tucana V", The Astrophysical Journal, 892 (2): 137, arXiv:1911.08493, Bibcode:2020ApJ...892..137S, doi:10.3847/1538-4357/ab7ccb, retrieved 2025-07-28