I took photographs of contrail left by what seems to be a Pulse Wave Detonation Engine. The aircraft emitting the contrail was almost to the western horizon by the time I noticed the contrail almost overhead. I only saw a glint of the aircraft in the very bright sunlight,(my angle of view was almost directly into the sun). It appeared to be traveling at a very high rate of speed. It travelled in a straight line from the southeastern horizon to the western horizon. I heard no sound at the time of the sighting, nor after. This could be consistant with other reports of top-secret experimental,(or operational?)military aircraft such as the "Aurora", or the "X-33".Brian KleinLead, SD
Top 100 nearest sightings ordered by sighting date (100 miles radius):
| Location | Sighted on | Shape | Duration |
|---|---|---|---|
| Location | Sighted on | Shape | Duration |
| Spearfish, sd | 2020-08-07 | Unknown | 3 minutes |
| Rapid City, South Dakota (United States) | 2020-06-04 | Circle | 05:00:00 |
| Rapid City, South Dakota (United States) | 2019-12-19 | Circle | 00:10:00 |
| Lead, South Dakota (United States) | 2019-11-01 | Triangle | 00:00:08 |
| Newell, South Dakota (United States) | 2019-04-23 | Bullet, Missile | 00:04:10 |
| Custer, South Dakota (United States) | 2018-09-04 | Saturn-like | 02:00:00 |
| Custer, South Dakota (United States) | 2018-09-04 | Saturn-like | 02:00:00 |
| Custer, South Dakota (United States) | 2018-07-08 | Other | |
| Belle Fourche, South Dakota (United States) | 2018-04-30 | Other | 00:11:00 |
| Newell, South Dakota (United States) | 2017-12-13 | Circle | 00:10:00 |
| Newell, South Dakota (United States) | 2017-08-23 | Saturn-like | 00:06:09 |
| Vale, South Dakota (United States) | 2017-06-08 | Unknown | 00:15:00 |
| Spearfish, SD | 2016-11-26 | Disk | 30 minutes |
| Sundance, Wyoming (United States) | 2016-11-23 | Sphere | |
| Sturgis, South Dakota (United States) | 2016-11-20 | Star-like | 01:00:00 |
| Rapid City, South Dakota (United States) | 2016-06-16 | Fireball | Undisclosed |
| Rapid City, SD | 2016-06-16 | Sphere | 5 minutes |
| Box Elder, SD | 2016-06-16 | Oval | 2 minutes |
| Rapid City, SD | 2016-05-23 | Circle | 5 seconds |
| Newcastle, Wyoming (United States) | 2016-05-19 | Circle | |
| Spearfish, South Dakota (United States) | 2016-04-12 | Chevron | Undisclosed |
| Rapid City, SD | 2016-02-16 | Unknown | >1 hour |
| Rapid City, South Dakota (United States) | 2016-01-08 | Blimp | 01:10:30 |
| Rapid City, South Dakota (United States) | 2015-12-12 | Circle | Undisclosed |
| Rapid City, South Dakota (United States) | 2015-12-08 | Star-like | Undisclosed |
| Mount Rushmore, South Dakota (United States) | 2015-10-13 | Circle | Undisclosed |
| Devils Tower, Wyoming (United States) | 2015-10-10 | Sphere | Undisclosed |
| Deadwood, South Dakota (United States) | 2015-06-21 | Star-like | 00:05:00 |
| Rapid City, South Dakota (United States) | 2015-03-29 | Boomerang | 00:05:00 |
| Mount Rushmore, South Dakota (United States) | 2015-03-16 | cigar shaped | just about two minutes |
| Rapid City, SD | 2014-12-17 | Unknown | 1 hour |
| Rapid City, SD | 2014-09-02 | Formation | 20 seconds |
| Spearfish, SD | 2014-09-02 | Fireball | 1-2 minutes |
| Rapid City, SD | 2014-09-02 | Formation | 20 seconds |
| Spearfish, SD | 2014-09-02 | Fireball | 1-2 minutes |
| Rapid City, SD | 2014-08-16 | Light | 10 minutes |
| Rapid City, SD | 2014-08-16 | Light | 10 minutes |
| Hulett (Devils Tower), WY | 2014-07-30 | ? | |
| Hulett (Devils Tower), WY | 2014-07-30 | ? | |
| Rapid City, SD | 2014-06-29 | Light | 15 minutes |
| Rapid City, SD | 2014-06-29 | Light | 15 minutes |
| Hill City, South Dakota (United States) | 2014-06-20 | Sphere | Undisclosed |
| Rapid City, South Dakota (United States) | 2014-06-05 | Oval | 00:00:03 |
| Box Elder, SD | 2014-06-05 | Light | 30 seconds |
| Rapid City, SD | 2014-06-05 | Sphere | 1 hour 11minutes |
| Box Elder, SD | 2014-06-05 | Light | 30 seconds |
| Rapid City, SD | 2014-06-05 | Sphere | 1 hour 11minutes |
| Spearfish, South Dakota (United States) | 2014-04-20 | N, A | 00:20:00 |
| Rapid City, SD | 2013-12-24 | Cylinder | 40 minutes |
| Rapid City, SD | 2013-11-02 | Other | 30+ minutes |
| Blackhawk, South Dakota (United States) | 2013-10-22 | Boomerang, Chevron, Sphere, Triangle | Undisclosed |
| Spearfish, South Dakota (United States) | 2013-10-01 | Sphere | 00:30:24 |
| Rapid City, SD | 2013-09-21 | Unknown | 30-40 minutes |
| Devils Tower, WY | 2013-08-12 | Light | 10 seconds |
| Rapid City, South Dakota (United States) | 2013-07-17 | Star-like | Undisclosed |
| Rapid City, SD | 2013-07-17 | Light | 20 seconds |
| Summerset, SD | 2013-07-04 | Light | 15 seconds |
| Black Hawk, SD | 2013-07-03 | Circle | few seconds |
| Pine Haven, Wyoming (United States) | 2013-02-28 | Fireball | 00:00:10 |
| Rapid City, South Dakota (United States) | 2013-01-29 | Other | Undisclosed |
| Rapid City, SD | 2012-12-22 | Unknown | 3 minutes |
| Rapid City, SD | 2012-12-15 | Other | 5 minutes |
| Rapid City, SD | 2012-06-09 | Changing | 2 minutes |
| Rapid City, SD | 2012-04-22 | Other | 6 OR 7 SECONDS |
| Pine Haven, WY | 2012-03-17 | Teardrop | 20-30 seconds |
| Rapid City, SD | 2012-02-13 | Triangle | 1 minute |
| Lead, South Dakota (United States) | 2012-02-09 | Circle, Oval, Sphere | Undisclosed |
| Rapid City, South Dakota (United States) | 2011-12-29 | Fireball | Undisclosed |
| Rapid City, SD | 2011-10-26 | Triangle | 5seconds |
| Hulett (near), WY | 2011-10-21 | Light | 10 to 12 seconds |
| Rapid City, SD | 2011-08-13 | Other | 15 seconds |
| Custer, SD | 2011-07-22 | Circle | 5 Minutes |
| Rapid City, South Dakota (United States) | 2010-07-30 | Other | Undisclosed |
| Custer, South Dakota (United States) | 2010-07-30 | Star-like, Other | 00:02:00 |
| Custer, South Dakota (United States) | 2010-07-23 | Star-like, Unknown | 00:05:00 |
| Rapid City, South Dakota (United States) | 2010-05-26 | Other | 00:00:00 |
| Rapid City, SD | 2009-08-22 | Light | 5 mins |
| Keystone, SD | 2009-07-22 | Circle | 45 sec |
| Rapid City, SD | 2009-05-25 | Triangle | 30 seconds |
| Rapid City, SD | 2009-05-18 | Triangle | 4-5 minutes |
| Rapid City, SD | 2009-05-17 | Unknown | 5 seconds |
| Rapid City, SD | 2009-03-19 | Light | 20 seconds |
| Rapid City, SD | 2008-10-14 | Cigar | ongoing |
| Black Hills, SD | 2008-07-15 | Unknown | approx. 15 min |
| Rapid City, SD | 2007-10-04 | Cigar | 15 seconds |
| Rapid City, South Dakota (United States) | 2007-08-15 | Other | Undisclosed |
| Rapid City, South Dakota (United States) | 2007-03-07 | Circle, Sphere, Triangle, Other | Undisclosed |
| Rapid City, South Dakota (United States) | 2007-01-04 | Cylinder | 00:02:00 |
| Rapid City, SD | 2006-10-30 | Triangle | 10 seconds |
| Spearfish, SD | 2006-10-29 | Chevron | 4 - 5 seconds |
| Deadwood, SD | 2006-05-22 | Disk | instantaneous |
| Rapid City, South Dakota (United States) | 2005-08-20 | Sphere | Undisclosed |
| Sturgis, SD | 2005-08-10 | Flash | 3 minutes |
| Rapid City, SD | 2005-04-20 | Triangle | 1-2 min |
| Rapid City, SD | 2005-02-25 | Light | 3.0 seconds |
| Rapid City/ Box Elder, SD | 2004-11-15 | Triangle | 10 Min |
| Lead, SD | 2004-09-12 | Flash | 30 minutes |
| Sturgis, SD | 2004-06-10 | Unknown | 15 seconds |
| Rapid City, SD | 2004-03-15 | Triangle | 8min |
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