Observations of dwarf planet (136199) Eris and other large TNOs on Lulin Observatory

H. W. Lin, Y. L. Wu, W. H. Ip

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6 Scopus citations


To provide comprehensive observations and in-depth standy of the physical property of the trans-neptunian objects (TNOs), the Lulin Observatory in Taiwan has started a program to study the time variabilities of lightcurves of large TNOs and dwarf planets. Our initial results show that (50000) Quaoar has a significant brightness variation of Δm ∼ 0.3 with a rotation period of about 18.84 h while (136199) Eris (formerly 2003 UB313) has very little brightness variation (Δm ∼ 0.05). The rotation period of Eris is hence highly uncertain even though a periodicity of 3.55 h is suggested by our measurements.

Original languageEnglish
Pages (from-to)238-243
Number of pages6
JournalAdvances in Space Research
Issue number2
StatePublished - 2007


  • Lightcurves
  • Lulin Observatory
  • Rotation periods
  • Spacecraft exploration
  • Trans-neptunian objects


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