Coverage started 2007 March 5
Updated 2007 March 5
2007 Feb 14: SL-12 Rocket Body Explosion
On February 16, I received a report from Jari Suomela in Finland regarding some photographs taken by Jari Tuukkanen of an apparent debris cloud associated with NORAD Catalog Number 25054, an SL-12 rocket body aux motor. The photographs were taken from 62.878° N, 24.800° E, 152 m altitude, while the camera was centered on 4h 8m right ascension, 27° 18' declination, at the times shown below:
Photograph taken at 17:23:47 UTC, 10-second exposure
Photograph taken at 17:24:08 UTC, 10-second exposure
Photograph taken at 17:24:30 UTC, 10-second exposure
The original photographs can be found at http://www.st-suunnittelu.fi/romu/.
Analysis confirmed that NORAD Catalog Number 25054 was moving through the field of view at the time of these photographs, but that no other objects in the public satellite catalog (SATCAT) could be associated with these observations. These results were reported to Cheyenne Mountain on February 21, but no new objects associated with this event have been added to the public SATCAT as of this date. As such, it is impossible at this time to determine when this event might have occurred, although it was probably within a couple of hours of the observations.
2007 Feb 19: BREEZE-M Rocket Body Explosion
As reported on Astronomy Picture of the Day on February 22, Ray Palmer in Australia captured a BREEZE-M rocket body explosion while taking a picture of the Milky Way on the morning of February 20. His half-hour exposure photograph was taken from 01:50 to 02:17 WST (16:50 to 17:17 UTC on February 19) from Chittering Western Australia at 31° 27' S, 116° 06' E.
Photograph taken at 16:50 to 17:17 UTC
Analysis of this event confirms the passage of NORAD Catalog Number 28944 with excellent agreement, as seen in the figure below. No other objects in the public catalog could be associated with this observation, but since the point where the explosion first appeared (lower-right end of the streak) can be correlated with the position of 28944 at 17:10:40 UTC, and that time is well after the beginning of the exposure, it is reasonable to conclude that the event occurred at that time. No objects associated with this event have yet been added to the public SATCAT, however, so no additional confirmation is possible at this time.
Simulated view from estimated time of event at 17:10:40 UTC
Other views of this event can be seen at:
It appears that it is highly unlikely that this event is associated in any way with the debris from the Chinese ASAT test, which was conducted in January. While 28944 does pass through the debris ring (below the known debris) around 16:34 UTC—that is about 37 minutes before the event appears to begin. As can be seen in the figure below, shown at the time the event appears to have occurred, 28944 is well outside the debris ring from the Chinese ASAT at this time.
View of NORAD Catalog Number 28944 and Chinese ASAT Debris Ring at Time of Apparent Explosion
An AGI Viewer file of this event is provided to permit additional examination of this event. In it, the orbit of 28944 is green, except during the time of Ray Palmer's photographic exposure (16:50 to 17:17 UTC). During that time, the orbit is yellow and the portion of the orbit which appears in his photograph (starting at 17:10:40 UTC) is orange. There is a line from the observing location to 28944 throughout the time that 28944 was in the camera field of view (which is also shown in yellow).
Note: AGI Viewer is a free product which allows anyone with a Windows computer to view an STK (Satellite Tool Kit) scenario. With it, you can animate a scenario forward or backward, pause the animation, and zoom or pan the view for a more complete understanding of the event. Just like with Adobe Acrobat, where the authoring software requires a license but the Adobe Reader is free, STK can produce AGI Viewer files—also known as VDFs—which can then be viewed by anyone with the AGI Viewer software. You can find the free AGI Viewer on the AGI web site at https://www.agi.com/stk-viewer. - TS
Dr. T.S. Kelso
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