Jun Yao's PhD Dissertation Defense

Congratulations to Jun Yao on earning his PhD!

• Dissertation title: Establishment and Transformation of Microarcsecond Celestial Reference Frames
• Time: May 11, 2026, at 9:00 a.m. (China Standard Time)
• Venue: Meeting Room 302, School of Astronomy and Space Science, Xianlin Campus, Nanjing University

The dissertation investigates the systematic effects of Galactic aberration on Earth orientation parameter estimation, computes high-precision semi-analytical expressions for practical precession-nutation parameters, achieves a sub-milliarcsecond tie between ephemeris and optical reference frames through joint orbit determination using Gaia asteroid data, and assesses the potential of the China Space Station Telescope (CSST) to extend multiwavelength reference frames.

Congratulations, Dr. Yao!