In News:

Europe's Proba-3 mission to arrive in India for launch aboard PSLV-XL by ISRO

Key Highlights:

• Objective: The Proba-3 mission, led by the European Space Agency (ESA), aims to observe the Sun’s corona by creating an artificial solar eclipse. This will allow continuous observation of the Sun’s faint outer atmosphere, which is typically only visible during a natural solar eclipse.
• Key Features:
  • Artificial Solar Eclipse: The two spacecraft will fly in formation to maintain a shadow between them, enabling the uninterrupted observation of the solar corona.
  • Formation Flying: The satellites must maintain a precise formation with an accuracy of one millimetre, equivalent to the thickness of a fingernail.

Mission Details

• Launch Date: Scheduled for December 4, 2024.
• Launch Location: Satish Dhawan Space Centre near Chennai, India.
• Launch Vehicle: The PSLV-XL rocket developed by ISRO will be used for the launch.
• Spacecraft Mass: The combined mass of the two spacecraft is 550 kg.
• Orbit: The spacecraft will be placed in a highly elliptical orbit with a maximum altitude of 60,000 km to facilitate the precise formation flying.
  • This high altitude minimizes Earth’s gravitational pull and reduces the amount of propellant required to maintain their positions during the mission.

Mission Significance

• Solar Observation: The primary objective is to observe the Sun’s corona, which has been challenging to study due to its faintness. The artificial eclipse will allow continuous data collection on solar activity.
• Formation Flying: This technology will allow the two satellites to maintain autonomous flight with millimetre-level precision, which is a significant advancement in satellite formation control.
• Six-Hour Observation Windows: Each formation flying session will last for up to six hours, during which the satellites will observe the Sun's corona.

Technological and Scientific Contributions

• ASPIICS Instrument: The ASPIICS (AStronomical PIcture Camera for the Intense Corona of the Sun) will be the mission's primary instrument, developed by the Royal Observatory of Belgium. It will provide crucial data on solar activity and space weather.
• International Collaboration: The mission is a collaborative effort involving 14 ESA member states and various organizations across Europe.
• Mission Control: The mission will be managed from the ESA’s European Space Operations Centre (ESOC) in Belgium, with significant pre-launch training and preparations already underway.

ISRO's Role and Historical Context

• Launch by ISRO: The Proba-3 mission will be ISRO’s first launch for ESA since 2001, marking an important milestone in India-Europe space cooperation.
• PSLV-XL Rocket: ISRO’s PSLV-XL rocket is known for its reliability and capability in deploying satellites into precise orbits. It is well-suited to carry the 550 kg Proba-3 duo into a highly elliptical orbit for the mission.