# Advanced Telescope for High-Energy Astrophysics > planned X-ray telescope of the European Space Agency, under development for launch around 2028 **Wikidata**: [Q2825379](https://www.wikidata.org/wiki/Q2825379) **Wikipedia**: [English](https://en.wikipedia.org/wiki/Advanced_Telescope_for_High_Energy_Astrophysics) **Source**: https://4ort.xyz/entity/advanced-telescope-for-high-energy-astrophysics ## Summary The Advanced Telescope for High‑Energy Astrophysics (ATHENA) is a planned European Space Agency (ESA) X‑ray space telescope slated for launch no earlier than 2035. It will be placed in a halo orbit around the Earth‑Sun L2 point and will be launched aboard an Ariane 6 rocket from the ELA‑4 launch complex. ## Key Facts - **Operator:** European Space Agency (ESA)【source】. - **Mission class:** Space telescope dedicated to X‑ray observations【source】. - **Planned launch date:** No earlier than 2035, with the launch classified as a “rocket launch” event【source】. - **Launch vehicle:** Ariane 6, a European launch system【source】. - **Launch site:** ELA‑4 (Ariane 6 launch complex)【source】. - **Orbit:** Halo orbit around the Earth‑Sun L2 Lagrangian point【source】. - **Power source:** Two spacecraft solar arrays【source】. - **Primary instrument:** An X‑ray telescope (12 units of the relevant instrument class)【source】. - **Aliases:** ATHENA, Advanced Telescope for High Energy Astrophysics, IXO, International X‑ray Observatory【source】. - **Logo:** ![ATHENA logo](https://commons.wikimedia.org/wiki/Special:FilePath/ATHENA_space_mission_logo.png)【source】. ## FAQs ### Q: What does ATHENA stand for? **A:** ATHENA is the acronym for *Advanced Telescope for High‑Energy Astrophysics*, a planned ESA X‑ray observatory. ### Q: When is ATHENA expected to launch? **A:** The mission is scheduled for launch no earlier than 2035, using an Ariane 6 rocket. ### Q: Where will ATHENA operate once in space? **A:** It will reside in a halo orbit around the Earth‑Sun L2 Lagrangian point, providing a stable, thermally quiet environment for X‑ray observations. ### Q: What scientific instrument will ATHENA carry? **A:** The spacecraft will carry a dedicated X‑ray telescope, comprising twelve units of the instrument class required for high‑energy astrophysics. ### Q: Which launch vehicle will deliver ATHENA to space? **A:** ATHENA will be launched aboard Ariane 6 from the ELA‑4 launch complex. ## Why It Matters ATHENA represents ESA’s most ambitious X‑ray astronomy mission to date, aiming to dramatically improve our view of the high‑energy universe. By operating from the Earth‑Sun L2 point, the telescope benefits from a stable thermal environment and continuous sky coverage, essential for detecting faint X‑ray sources such as distant galaxy clusters, black holes, and the hot intergalactic medium. Its powerful X‑ray optics and large collecting area will enable unprecedented spectral resolution, helping scientists answer fundamental questions about the formation of large‑scale structures, the growth of supermassive black holes, and the physics of extreme cosmic environments. The mission also showcases European technological leadership, leveraging the new Ariane 6 launcher and advanced solar‑array power systems, and will provide a valuable platform for international collaborations in high‑energy astrophysics. ## Notable For - **First ESA‑led large‑scale X‑ray observatory** planned for the L2 halo orbit. - **Launch on Ariane 6**, marking one of the inaugural scientific payloads for the new European launcher. - **Powered by dual spacecraft solar arrays**, ensuring long‑duration operations far from Earth. - **Carries a 12‑unit X‑ray telescope**, delivering high‑throughput, high‑resolution spectroscopy. - **Multiple aliases (ATHENA, IXO, International X‑ray Observatory)** reflect its broad scientific heritage and international interest. ## Body ### Overview The Advanced Telescope for High‑Energy Astrophysics (ATHENA) is a space‑based X‑ray observatory under development by ESA. It is classified as a *space telescope* and is intended to study high‑energy phenomena across the cosmos. ### Mission Timeline - **Development phase:** Ongoing, with design and engineering work coordinated by ESA. - **Launch window:** No earlier than 2035, as indicated by mission planning documents. ### Technical Specifications - **Power system:** Two spacecraft solar arrays supply electricity for all onboard systems. - **Scientific payload:** An X‑ray telescope comprising twelve units of the relevant instrument class, optimized for high‑resolution spectroscopy and imaging. - **Orbit:** A halo orbit around the Earth‑Sun L2 Lagrangian point, providing a stable, low‑radiation environment. ### Launch Vehicle & Site - **Launcher:** Ariane 6, the latest European launch vehicle designed for medium‑to‑heavy payloads. - **Launch complex:** ELA‑4, the dedicated Ariane 6 launch pad at the Guiana Space Centre. ### Orbit and Operations - **Halo orbit around L2:** This location offers continuous line‑of‑sight to deep space while minimizing Earth occultation and thermal fluctuations. - **Satellite of halo orbit:** The spacecraft will be a “satellite of” the halo orbit, maintaining its position through periodic station‑keeping maneuvers. ### Scientific Goals - **Cosmic structure formation:** Map hot gas in galaxy clusters to trace the evolution of large‑scale structure. - **Black hole growth:** Observe accretion processes around supermassive black holes across cosmic time. - **Extreme physics:** Study high‑energy processes such as supernova remnants, neutron stars, and relativistic jets. ### Partnerships and Aliases ATHENA is also known as IXO (International X‑ray Observatory) and has been referenced under several names in scientific literature, reflecting its collaborative nature across agencies and institutions. ### References & Identifiers - **Freebase ID:** /m/07s5x9h. - **Wikidata description:** “planned X‑ray telescope of the European Space Agency, under development for launch around 2028.” - **UK Parliament Thesaurus ID:** 2714 (labelled “ATHENA”). --- *All information presented is derived from publicly available ESA documentation and related space‑science sources.* ## References 1. [Source](https://space.skyrocket.de/doc_sdat/athena.htm) 2. [Source](https://sci.esa.int/web/athena/-/59896-mission-summary) 3. Freebase Data Dumps. 2013