173Yb has 70 protons and 103 neutrons.
173Yb is a stable isotope.
The mass excess of 173Yb is -57551.234 with an uncertainty of ±0.011.
The mass was measured using a Penning Trap and the related equations include:
Influence Equations
56.7% 173Yb-129Xe1.341 1
30.1% 174Yb-132Xe1.318 1
Reference
1. R. Rana, M. Hocker, E.G. Myers (2012) Atomic masses of strontium and ytterbium
Physical Review A 86(5)
https://journals.aps.org/pra/abstract/10.1103/PhysRevA.86.050502