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- Source: inbox/queue/2026-04-21-esa-hera-early-arrival-november-2026.md - Domain: space-development - Claims: 0, Entities: 1 - Enrichments: 1 - Extracted by: pipeline ingest (OpenRouter anthropic/claude-sonnet-4.5) Pentagon-Agent: Astra <PIPELINE>
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38 lines
No EOL
1.8 KiB
Markdown
# ESA Hera
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**Type:** Planetary defense validation mission
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**Launch:** October 2024 (Falcon 9)
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**Target:** Didymos binary asteroid system
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**Arrival:** November 2026 (one month ahead of schedule)
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**Status:** En route after Mars swingby
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## Mission Profile
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Hera is ESA's follow-up mission to NASA's DART kinetic impactor test. After launching in October 2024, Hera performed a Mars swingby with Deimos flyby in March 2025. Second deep-space maneuver completed March 2026 (123 kg hydrazine, 367 m/s delta-v). Mission efficiency gains enabled one-month early arrival.
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## Primary Objectives
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1. **Crater characterization** — High-resolution survey of DART impact site on Dimorphos
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2. **Mass determination** — Precise measurement enabling accurate β factor recalculation
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3. **Internal structure** — Determine if Dimorphos is rubble pile throughout or has coherent core
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4. **CubeSat deployment** — Milani (surface mineralogy) and Juventas (internal radar sounding)
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## Planetary Defense Significance
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Hera's characterization of Dimorphos internal structure will determine whether kinetic deflection is reliable for the full potentially hazardous asteroid population or limited to rubble-pile aggregates. DART's β=3.61 likely resulted from loose structure allowing free ejecta escape. More coherent asteroids would show β approaching 1 (no momentum amplification).
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## Timeline
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- **2024-10** — Launch on Falcon 9
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- **2025-03** — Mars swingby with Deimos flyby
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- **2026-03** — Second deep-space maneuver (123 kg hydrazine, 367 m/s)
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- **2026-11** — Didymos arrival (one month ahead of baseline schedule)
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## Related Programs
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- NASA DART (kinetic impactor, September 2022)
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- China kinetic impactor test (2026)
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---
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*Mission validates planetary defense capability and determines generalizability of kinetic deflection technique across asteroid population.* |