Open for General Admission!
As of Jan. 31, Lowell Observatory has reopened General Admission.
1400 West Mars Hill RdFlagstaff AZ, 86001
Infinite Wonders Await!
Help us create experiences of awe and wonder with the Astronomy Discovery Center, opening by 2024.
Lowell scientists and collaborators studied the 1997 apparition of Comet Hale-Bopp with a number of instruments around the United States.
Periodic comet 103P/Hartley 2 was discovered by Malcolm Hartley in 1986, with the 2010 apparition being its most favorable since its discovery.
This long-period comet passed within 9.3 million miles of Earth on March 25, 1996, making it one of the closest cometary apparitions in two centuries.
Comet Linear (1999 S4) is a long-period comet discovered on September 27, 1999 by the Lincoln Near-Earth Asteroid Research (LINEAR) program.
Comet Tempel-1 is a periodic comet discovered by German astronomer Wilhelm Tempel in 1867.