Tempel 1 and Deep Impact
Observed: 3, 5 July 2005
6 July 2005
39 h after the collision, the comet was still slightly brighter than before.
The NASA probe Deep Impact reached Tempel 1, releasing its 370kg Impactor that collided
with the comet on July 4, 2005 at 05:52 UT at 10.2km/s. The energy of the collision was
19 GJ (the
equivalent of 4.8 tons of TNT), the comet was at 0.89 au from Earth,
I observed the comet with a 203mm f/6.3 SC telescope, a SBIG ST7E
camera (KAF401E CCD) and a Clear filter. Each exposure is 1 mn long.
Observation 8.3h before the collision:
For my location, it was daylight at the time of the collision. The night that
followed, it was raining. So I observed it 39.4h after the collision:
The comet appeared to be slightly brighter after the collision.
More precisely, I measured the following intensities (in ADU) from stacked images (4x60 s exposure):
|BEFORE:|| intensity=126,160|| background=2829|
|AFTER:|| intensity=167,624|| backgroung=2801|
Telescope and camera configuration.
Software and computer configuration.