Noun
visual magnitude (plural visual magnitudes)
(astronomy) The apparent magnitude of a star in the central part of the spectrum of visible light
As all the stars of a globular cluster are at approximately the same distance from us, their absolute magnitudes differ from their visual magnitude by about the same amount. Source: Internet
The seven most prominent stars in this cluster are at least visual magnitude six, and so the cluster is also named the "Seven Sisters". Source: Internet
When considered among the individual brightest stars in the sky (excluding the Sun ), Alpha Centauri A is the fourth brightest at an apparent visual magnitude of +0.01, being fractionally fainter than Arcturus at an apparent visual magnitude of −0.04. Source: Internet
It has a redshift of 0.0909 (meaning it is moving away from us at 27,250 km/s) and a visual magnitude of 16.0. Source: Internet
This in turn provides a distance estimate to the cluster, based on the visual magnitude of the stars. Source: Internet