Near Earth Object Surveillance Satellite
|Mission type||Asteroid detection|
|Mission duration||Primary mission: 1 year
Elapsed: 1 year, 6 months and 7 days
|Bus||Multi-Mission Microsatellite Bus|
|Manufacturer||David Florida Laboratory, Spectro, Microsat Systems|
|Launch mass||74 kg (163 lb)|
|Dimensions||1.4 × 0.65 × 0.35 m (4.6 × 2.1 × 1.1 ft)|
|Start of mission|
|Launch date||February 25, 2013, 12:31UTC|
|Launch site||Satish Dhawan FLP|
|Semi-major axis||7,156.010 km (4,446.538 mi)|
|Perigee||776 km (482 mi)|
|Apogee||793 km (493 mi)|
|Epoch||August 22, 2014, 11:55:32 UTC|
The Near Earth Object Surveillance Satellite (NEOSSat) is a Canadian microsatellite using a 15-cm aperture f/5.88 Maksutov telescope similar to that on the MOST spacecraft, 3-axis stabilized with pointing stability of ~2 arcseconds in a ~100 second exposure. It is funded by the Canadian Space Agency (CSA) and Defence Research and Development Canada (DRDC), and will search for interior-to-Earth-orbit (IEO) asteroids, at between 45 and 55 degree solar elongation and +40 to -40 degrees ecliptic latitude.
The NEOSSat satellite will carry out two missions.
The Near Earth Space Surveillance (NESS) mission, led by Principal Investigator Alan Hildebrand of the University of Calgary, will use NEOSSat to search for and track near-Earth asteroids interior to Earth's orbit around the Sun, including asteroids in the Aten and Atira classes. These asteroids are particularly difficult to detect from the surface of the Earth, as they are usually positioned in the daylit or twilit sky, when background light from the Sun makes such faint objects invisible. This form of stray light is not an issue for a telescope in orbit, making even a small-aperture telescope such as that on NEOSSat capable of detecting faint asteroids. The NESS science team expects to be able to detect many such asteroids as faint as visual magnitude 19. The NESS mission is funded by the CSA.
The High Earth Orbit Space Surveillance (HEOSS) mission, led by Principal Investigator Brad Wallace of DRDC, will use NEOSSat to conduct experimental satellite tracking activities, focusing principally on satellites in high Earth orbit, such as geostationary communications satellites, which are difficult to track via ground-based radar. These experiments will include submitting tracking data to the Space Surveillance Network, as part of Canada's role in NORAD. The HEOSS activities are intended to support planning for follow-on missions to the Canadian Department of National Defence's operational satellite-tracking satellite, Sapphire, which was launched with NEOSSat. The HEOSS mission is funded by DRDC.
NEOSSat, originally conceived under the name NESS ("Near Earth Space Surveillance"), was proposed by Dynacon in 2000 to DRDC and CSA as a follow-on to the MOST microsatellite mission which was then half-way through its development. As conceived during an initial Phase A study for DRDC, it would have re-used almost all of the equipment designs from MOST, the main addition being a large external baffle to reduce the stray light impinging on the instrument's focal plane, necessary in order to achieve its asteroid detection sensitivity target of magnitude 19.
DRDC's Technology Demonstration Program (TDP) approved CDN$6.5M of funding for NEOSSat in 2003. By mid-2004 CSA had approved the remaining funding needed to initiate the NEOSSat procurement, and with DRDC formed a Joint Program Office to manage the mission development. At this point the spacecraft's name was changed from NESS to NEOSSat. A final Phase A study was carried out under CSA supervision in 2005, and a Phase B/C/D procurement was carried out in 2006/07, with a total development price cap of CDN$9.8M (not including launch cost). Dynacon was selected as prime contractor in 2007, at which point the total development cost was reported as CDN$11.5M, with a target launch date of late 2009. Shortly after that, Dynacon sold its Space division to Microsat Systems Canada Inc. (MSCI), which completed development of NEOSSat.
As development proceeded, while the basic design concept was kept, much of the equipment in the satellite was replaced by new designs in order to meet requirements imposed by the CSA's Multi-Mission Microsatellite Bus program. The basic instrument design was kept, as was the basic structure design, and the attitude control subsystem sensors and actuators; the on-board computers and radios were replaced, the instrument readout electronics was redesigned, and the external instrument "door" was replaced by an internal shutter.
By 2012, the CSA's contribution to program funding had risen by CDN$3.4M to CDN$8.8M, implying a total program contracted-out cost to end of satellite commissioning of CDN$15.4M.
NEOSSat was originally scheduled for launch in 2007, but delays set it back until 2013. Alongside another Canadian spacecraft, Sapphire (a military survellience satellite), and five other satellites, NEOSSat launched on February 25, 2013, from the Satish Dhawan Space Centre in Sriharikota, India, at 12:31 UTC aboard an Indian PSLV-C20 rocket.
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