Astronomical Netherlands Satellite
First Dutch satellite, discovered X-ray bursts and observed ultraviolet sources.
The Astronomical Netherlands Satellite (ANS; also known as Astronomische Nederlandse Satelliet) was a space-based X-ray and ultraviolet telescope. Launched on 30 August 1974, it was the first Dutch satellite, jointly funded by the Netherlands Institute for Space Research (NIVR) and NASA. The mission operated for 20 months until June 1976, and its discoveries included X-ray bursts and X-rays from Capella.
Quick Facts
- Names List
- Astronomische Nederlandse Satelliet / ANS
- Operator
- SRON / NASA
- Satcat
- 07427
- Mission Duration
- 20 months
- Launch Mass
- 129.8 kg
- Launch Date
- 1974-08-30
- Launch Rocket
- Scout
- Launch Site
- Vandenberg SLC-5
- Decay Date
- 14 June 1977
- Orbit Periapsis
- 266 km
- Orbit Apoapsis
- 1176 km
- Orbit Period
- 99.2 min
Facts from the source article.
Lore & Background
ANS was launched into a Sun-synchronous Earth orbit with a periapsis of 266 km and an apoapsis of 1,176 km. Its attitude was controlled via reaction wheels, with momentum regularly dumped using magnetic coils interacting with Earth's magnetic field. Two masses were released shortly after orbit injection to remove most angular momentum from the launcher. Attitude measurement employed solar sensors, horizon sensors, star sensors, and a magnetometer.
The satellite carried an X-ray detector covering 2 to 30 keV with a 60 cm² area, used to locate galactic and extragalactic X-ray sources, measure their spectra, and study their variability. It discovered X-ray bursts and detected X-rays from Capella. In the ultraviolet, a 22 cm Cassegrain telescope observed wavelengths between 150 and 330 nm across five channels, taking over 18,000 measurements of about 400 objects.
ANS reentered Earth's atmosphere on 14 June 1977. The Main Belt asteroid 9996 ANS was named after it.
Reader's Guide
The Astronomical Netherlands Satellite holds significance as the first Dutch satellite and a pioneering space observatory in both X-ray and ultraviolet astronomy. Its discovery of X-ray bursts contributed to understanding high-energy astrophysical phenomena, while its ultraviolet observations provided data on hundreds of celestial objects. The mission demonstrated international collaboration between the Netherlands Institute for Space Research and NASA, and its Sun-synchronous orbit and precise attitude control system enabled targeted observations. The asteroid 9996 ANS commemorates its legacy. ANS's work laid groundwork for later X-ray and ultraviolet missions, and its dual-wavelength capability was innovative for its time.
Frequently Asked Questions
What is the Astronomical Netherlands Satellite (ANS)?
ANS was a space-based telescope that observed the cosmos in X-ray and ultraviolet wavelengths. It launched on 30 August 1974 and holds the distinction of being the first satellite ever placed into orbit by the Netherlands.
Who built and funded ANS?
The mission was a partnership between the Netherlands Institute for Space Research (NIVR) and NASA, combining Dutch scientific direction with American engineering and launch capability.
What did ANS discover during its mission?
Over its 20-month operational period, the satellite recorded X-ray bursts and confirmed X-ray emission from the star Capella, enriching the catalog of known high-energy sources.
Why is ANS considered important in space telescope history?
As the Netherlands' first independent satellite, ANS proved that a smaller nation could contribute original results to high-energy astrophysics and opened the door for subsequent Dutch participation in space-based astronomy.
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