astrodynamics-mcp vs Sidereon
astrodynamics-mcp is an MCP server published by astro-tools. Marketplaces we read that list it: 1 (Official MCP Registry). Sidereon is an MCP server published by neilberkman. Marketplaces we read that list it: 1 (Official MCP Registry). As of our marketplace pass on 2026-10-27. This pair was picked by a reader, not by our comparison rule, so search engines are asked not to index the page.
Where each is published
| Marketplace |  astrodynamics-mcp |  Sidereon |
|---|---|---|
| Official MCP Registry | Listed Version: 0.4.0 Downloads/month (PyPI): 259 Downloads/week (PyPI): 54 Forks (GitHub): 0 Stars (GitHub): 2 Not marked · First seen |
Listed Version: 3.0.3 Forks (GitHub): 1 Stars (GitHub): 18 Not marked · First seen |
Each figure is the marketplace's own and is never added up across marketplaces. A marketplace that publishes no figure shows none: no number is not zero.
The facts side by side
| Fact | astrodynamics-mcp | Sidereon |
|---|---|---|
| Marketplaces that list it | 1 | 1 |
| Stars (GitHub) (differs) | 2 (worse) | 18 (better) |
| Forks (GitHub) (differs) | 0 (worse) | 1 (better) |
| Last release (differs) | Not published | 2026-10-13 |
| Where it runs (differs) | On your machine (astrodynamics-mcp) | On your machine (https://github.com/neilberkman/sidereon/releases/download/v3.0.3/sidereon_3.0.3.mcpb) |
| Transport | stdio | stdio |
| Tools it declares | Not published | Not published |
| Environment variables it asks for | Not published | Not published |
| Licence | Not stated | Not stated |
| Repository (differs) | github.com/astro-tools/astrodynamics-mcp | github.com/neilberkman/sidereon |
| Changes in the last 7 days | 0 | 0 |
| First seen | 2026-10-11 | 2026-10-11 |
Lines where the two differ have a tinted background and bold values. Where the data itself says which value is better (more marketplaces, a larger figure of the same marketplace, a fresher release, a verified mark on a marketplace that lists both), the better one is also marked green with ▲ and the worse one red with ▼. Where it runs, the transport, the tools, the settings, hooks, the bundle's parts, the licence and the week's changes are marked only as different: more or fewer is not better in itself.
What each says it does
astrodynamics-mcp
Astrodynamics MCP server: TLE/SGP4, Lambert, access windows, porkchop, B-plane targeting.
Sidereon
GNSS positioning and astrodynamics: orbit propagation, passes, GNSS solves, and RINEX QC
How to run each
astrodynamics-mcp As a local MCP server: PyPI package
claude mcp add --transport stdio astrodynamics-mcp -- uvx astrodynamics-mcpSidereon
No data for an automatic command: what its marketplaces declare does not say unambiguously how to connect it.
Commands built only from what the marketplaces declare; the full set for every client is on each card.
Tools each declares
Neither one's marketplaces publish a list of tools, so there is nothing to compare.
Settings each asks for
Neither one's marketplaces publish the settings it asks for.
What it can do: astrodynamics-mcp · What it can do: Sidereon · Compare two other plugins
Data comes from the Official MCP Registry (registry.modelcontextprotocol.io), CC0 1.0. Figures come from our own regular passes over the marketplaces, last read on . We publish no contact details for plugin publishers.