Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

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

30.08.2006
While ESA's SMART-1 mission is running on its last orbits around the Moon before its planned lunar impact on 3 September 2006, the spacecraft 'star tracker' – or attitude camera - is taking exciting pictures of the ever approaching surface.

One week before the end of the SMART-1 mission, the SMART-1 Mission Control Team at the European Space Operations Centre (ESOC) in Germany are working together with the Danish Technical University (DTU), manufacturer of the star tracker, to demonstrate that this attitude camera is not only capable of determining the spacecraft attitude by looking at the stars, but can also be used for exciting peeks at the Moon. The DTU star tracker is a light-weight instrument, weighing only 3.2 kilogrammes including the baffles, and operates highly autonomously.


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. Credits: ESA

With only a few days to go, the flight control team is taking advantage of the star tracker being blinded by the moonlight to fuel the imagination and take images at close distance.

The first image was taken on 23 August at 12:42 CEST (10:42 UT), from 165 kilometres above the Moon surface, while 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.

Additional test images were taken by the star tracker on 25 August, from 165 and 59 kilometres altitude, respectively. The first image was taken while the spacecraft was moving at a speed of 2 kilometres per second, while the second image was taken when SMART-1 was travelling at 1.6 kilometres per second.

On Tuesday 29 August the spacecraft is in a favourable position to take the most exciting images so far. At that time the star tracker will have both the Earth and the Moon in its field of view, with the Earth about to disappear on the Moon's horizon.

To calibrate the star tracker and to ensure safe star tracker operation, the Flight Control Team at ESOC have taken test images with new star tracker settings provided by DTU. The resulting images already show a breath-taking view of the Moon.

"The star tracker provided its first images of the Milky Way a few days after SMART-1 was 'born' in space", says SMART-1 Project scientist Bernard Foing, "and it is also witnessing the last moments from the vehicle as if we were on board."

Bernard Foing | alfa
Further information:
http://www.esa.int/SPECIALS/SMART-1/SEMPFY5LARE_0.html

More articles from Physics and Astronomy:

nachricht SF State astronomer searches for signs of life on Wolf 1061 exoplanet
20.01.2017 | San Francisco State University

nachricht Molecule flash mob
19.01.2017 | Technische Universität Wien

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Traffic jam in empty space

New success for Konstanz physicists in studying the quantum vacuum

An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...

Im Focus: How gut bacteria can make us ill

HZI researchers decipher infection mechanisms of Yersinia and immune responses of the host

Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...

Im Focus: Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.

While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...

Im Focus: Studying fundamental particles in materials

Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales

Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...

Im Focus: Designing Architecture with Solar Building Envelopes

Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.

As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Sustainable Water use in Agriculture in Eastern Europe and Central Asia

19.01.2017 | Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

 
Latest News

Helmholtz International Fellow Award for Sarah Amalia Teichmann

20.01.2017 | Awards Funding

An innovative high-performance material: biofibers made from green lacewing silk

20.01.2017 | Materials Sciences

Ion treatments for cardiac arrhythmia — Non-invasive alternative to catheter-based surgery

20.01.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>