Mysterious interstellar visitor is a comet — not an asteroid

@article{Witze2018MysteriousIV,
  title={Mysterious interstellar visitor is a comet — not an asteroid},
  author={Alexandra Witze},
  journal={Nature},
  year={2018}
}
  • A. Witze
  • Published 27 June 2018
  • Physics, Geology
  • Nature
Quirks in ‘Oumuamua’s path through the Solar System helped researchers solve a case of mistaken identity. Quirks in ‘Oumuamua’s path through the Solar System helped researchers solve a case of mistaken identity. 

References

SHOWING 1-3 OF 3 REFERENCES
A brief visit from a red and extremely elongated interstellar asteroid
TLDR
Observations and analysis of the object 1I/2017 U1 (‘Oumuamua) that demonstrate its extrasolar trajectory, and that enable comparisons to be made between material from another planetary system and from the authors' own, reveal it to be asteroidal with no hint of cometary activity despite an approach within 0.25 astronomical units of the Sun.
Spectroscopy and thermal modelling of the first interstellar object 1I/2017 U1 ‘Oumuamua
During the formation and evolution of the Solar System, significant numbers of cometary and asteroidal bodies were ejected into interstellar space1,2. It is reasonable to expect that the same
Non-gravitational acceleration in the trajectory of 1I/2017 U1 (‘Oumuamua)
TLDR
‘Oumuamua—the first known interstellar object to have entered the Solar System—is probably a comet, albeit with unusual dust and chemical properties owing to its origin in a distant solar system.