Photometric-standard star

{{Short description|Stars that have had their light output measured carefully}}

Photometric-standard stars are a series of stars that have had their light output in various passbands of photometric system measured very carefully. Other objects can be observed using CCD cameras or photoelectric photometers connected to a telescope, and the flux, or amount of light received, can be compared to a photometric-standard star to determine the exact brightness, or stellar magnitude, of the object.{{cite journal

| bibcode = 1992AJ....104..340L

| date = 1 July 1992

| doi = 10.1086/116242

| doi-access = free

| first1 = A.U.

| journal = The Astronomical Journal

| last1 = Landolt

| pages = 340–371

| title = UBVRI photometric standard stars in the magnitude range 11.5-16.0 around the celestial equator

| volume = 104

}}

A current set of photometric-standard stars for UBVRI photometry was published by Arlo U. Landolt in 1992 in The Astronomical Journal.