3 ms·
G is the apparent magnitude in the green part of the spectrum. Astronomers have a standardised set of optical bandpass filters to record the brightness of a sta
by captaincrowbar 4y ago
G is the apparent magnitude in the green part of the spectrum. Astronomers have a standardised set of optical bandpass filters to record the brightness of a star at various wavelengths - U (ultraviolet), B (blue), V (visual), G (green), etc. Using the letter ID of the filter to mean "apparent magnitude as seen through this filter" is a common convention.
- DiogenesKynikos 4y agoG is for "Gaia," not "green." This is a wide band that covers most of the visible part of the spectrum. See: https://www.cosmos.esa.int/web/gaia/iow_20180316 https://www.cosmos.esa.int/web/gaia/iow_20180316