STF 554 (80 Tauri) is a multiple system in the constellation Taurus, located 150 light-years from the Sun, and is a member of the open star cluster Hyades. The main component A is a F0V main-sequence star with a mass of 0.86 solar masses, which itself is a spectroscopic binary with a period of 30.5 days. Companion B is a G0V main-sequence star with a mass of 0.70 solar masses. Components A and B orbit around their common center of mass with a period of 183 years. STF 554 (80 Tauri) also forms a physical system with the star 81 Tauri - C, a spectral type Am star with a mass of 1.91 solar masses, which is also a spectroscopic binary. This system is cataloged in the WDS under the name ARN 36. Another possible member of this system is the spectroscopic binary HD28545, which forms a physical system with 81 Tauri, and WDS lists this pair as BUP 62. It could be considered a 7-star system (2+1)+2+2.

100mm STF 554 + 81 Tauri + HD28545 is located approximately 1.5 degrees southwest of the brightest star in the Taurus constellation – Aldebaran. 81 Tauri and HD 28545 are bright and distant stars from STF 554, making their identification straightforward. However, resolving the components of STF 554 alone is not as simple with a 100mm telescope. At 180x magnification, patience was required, but over time, the companion began to emerge. With brief improvements in seeing conditions, the companion eventually became distinctly visible, closely but clearly separated from the main component. I observed the main component as white and the companion as blue-gray.