21P/Giacobini-Zinne

  • A GREEN COMET APPROACHES EARTH
    A GREEN COMET APPROACHES EARTH0

    Comet 21P/Giacobini-Zinner is approaching Earth. On Sept. 10th, it will be 0.39 AU (58 million km) from our planet and almost bright enough to see with the naked eye. Already it is an easy target for backyard telescopes. Last night, Michael Jäger of Weißenkirchen, Austria, caught the 7.7th magnitude comet passing through star cluster Tombaugh