Bienor

Within the supplied materials the mythological attestation is limited to a disambiguation notice that 'Bienor' is the name of four characters in Greek mythology; no origin narratives, genealogies, or deeds for those figures are provided. Separately, the modern astronomical usage follows the contemporary scientific practice of naming minor planets after mythological figures: 54598 Bienor is a centaur-class small body whose physical and rotational properties have been the subject of photometric study.

The supplied sources give no descriptive appearance for the mythological Bienor figures. For the astronomical object 54598 Bienor, observational modeling portrays it as a rotating, elongated body best fit by a triaxial (Jacobi) ellipsoid with semi-axes a > b > c. Best-fit axial ratios reported include b/a = 0.45 ± 0.05 (alternate fit with a ring: b/a = 0.37 ± 0.10). Its rotational period is 9.17 hours. Spectroscopic data consistent with water ice are noted; the photometric modeling also permits an interpretation that a ring system (similar in characteristics to those proposed for Chariklo and Chiron) could be present and influence observed brightness.

No supernatural abilities, agency, or behaviors are attributed to the mythological Bienor figures in the provided sources. The astronomical Bienor exhibits measurable physical/observational behaviours: time-variable photometric properties including a decline in rotational light-curve amplitude and in absolute magnitude over observations from 2000 to 2016. These changes are interpreted as consequences of changing aspect angle (viewing geometry) of a rotating, elongated body and are used to infer spin-axis orientation and bulk density (estimated ~594^{+47}_{-35} kg m^{-3} under hydrostatic equilibrium assumptions; alternate estimate ~678^{+209}_{-100} kg m^{-3} when a ring is included). The ring interpretation is presented as a viable explanation but not definitive.