SMART-1 ‘star tracker’ peeks at the approaching lunar surface


SMART-1 star tracker image from 165 kilometres altitude
 
This image of the lunar surface was taken on 23 August at 12:42 CEST (10:42 UT), by the star tracker (attitude camera) on board ESA’s SMART-1, from a distance of 165 kilometres above the Moon surface. SMART-1 was travelling at a speed of 1.93 kilometres per second.

The two craters visible on the image are 'satellite' craters to the Neumayer crater. Satellite craters are identified by the name of their parent crater and an additional letter. On the star tracker image the crater with the sharp rim is called Neumayer M (located at a latitude of 71.6° South, and a longitude of 78.5° East) and the one with the smooth rim is called Neumayer N (at a latitude of 70.4° South, and a longitude of 78.7° East).

The image is slightly smeared as the spacecraft is moving at high speed and at low altitude. This image was taken as a test, which means the spacecraft pointing was not optimised for taking images with the star tracker.

SMART-1 star tracker image from 59 kilometres altitude
 
This image of the lunar surface was taken on 25 August at 10:08 CEST (08:15 UT) by the star tracker (attitude camera) on board ESA’s SMART-1, from a distance of 59 km above the Moon surface. The spacecraft was travelling at a speed of 2 kilometres per second.

The image is slightly smeared as the spacecraft is moving at high speed and at low altitude. This image was taken as a test, meaning that the spacecraft pointing was not optimised for star tracker imaging. The Moon features on the photo still have to be identified.

SMART-1 star tracker image from 744 kilometres altitude
 
This image of the lunar surface was taken on 25 August 2006 at 15:48 CEST (13:48 UT) by the star tracker (attitude camera) on board ESA's SMART-1, from a distance of 744 km above the Moon surface. The spacecraft was travelling at a speed of 1.6 kilometres per second.

Remarkably, at the time the image was taken the star tracker was still producing valid attitude samples based on the few stars that are visible in the image. This image was taken as a test, meaning that the spacecraft pointing was not optimised for star tracker imaging. The Moon features on the photo still have to be identified.



Release date: 29 August 2006