A technique to estimate the brightness of a → variable star.
It involves comparing the variable with a sequence of neighboring stars of slightly
different → magnitudes.
Friedrich Wilhelm Argelander (1799-1875), German astronomer. His most important work was
his compilation of the Bonner Durchmusterung;
A → space probe designed to land on a
→ planet or other solid → celestial body.
→ land; → -er.
© 2005-2020 by M. Heydari-Malayeri