161P/Hartley–IRAS
Halley-type comet
161P/Hartley–IRAS
161P/Hartley–IRAS is a Halley-type comet in a retrograde orbit with an orbital period of 21 years. This is the sixth and final comet discovered by the infrared space telescope IRAS, and the third of twelve comets discovered overall by Australian astronomer, Malcolm Hartley.
Read on Wikipedia · Image Sacramento Valley Astronomical Society (a nonprofit educational organization and a 501(c)(3) charity), CC BY-SA 4.0
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