Astronomer watches Starlink satellites sinking to build a ‘planetary barometer’

Astronomer Tony Phillips has created a public daily atmospheric-density index using orbital tracking data from 1,000 Starlink satellites, 107 Planet SuperDoves, 391 Amazon Kuiper satellites, and 651 Eutelsat OneWeb satellites. The analysis indicates that satellite orbital decay tracks solar 10.7 cm radio flux with a roughly two-day lag, while geomagnetic storms cause faster, sharp increases in atmospheric drag. The development demonstrates a novel use of commercial satellite constellations but is unlikely to have a material near-term financial impact.

Analysis

This is not an investable catalyst for SPCX or PL by itself, but it marginally improves the market's ability to observe a previously opaque operating variable: thermospheric drag. For PL, elevated drag matters only if it translates into a higher-than-modeled replenishment cadence, lost imaging capacity, or incremental maneuvering/fuel constraints; the relevant earnings sensitivity is satellite replacement capex and service availability, not the value of the public data index. SPCX's look-through exposure is similarly negligible absent evidence that SpaceX must accelerate launches or materially alter constellation deployment economics.

The second-order beneficiary is the space-domain-awareness and mission-assurance ecosystem, where persistent drag volatility supports demand for orbital modeling, collision avoidance, and resilient satellite architectures. Public proxies include RKLB, which could benefit from greater replenishment-launch demand, and LMT/NOC, where defense customers may increase spending on space-weather forecasting and protected-space operations. The risk is that a data-rich public index commoditizes a small portion of environmental-monitoring analytics rather than creating a new paid service market.

Over the next days, expect no durable equity repricing. Over 1-3 months, the actionable signal would be a cluster of severe geomagnetic events coinciding with disclosed launch delays, asset losses, or a revision to expected satellite useful lives; that would widen the relative advantage of operators with higher orbits, better propulsion, and balance-sheet capacity for replacement launches. Over 6-18 months, repeated disruptions could raise insurance premiums and constellation lifecycle capex, pressuring lower-margin broadband and Earth-observation operators before affecting well-capitalized defense primes.

Key Decisions for Investors

• No directional trade in SPCX or PL on this item; treat it as a monitoring development rather than an earnings catalyst.
• Create an event-driven watchlist: long RKLB versus short PL only after independently verified evidence of elevated drag causing PL capacity loss, replacement-capex guidance pressure, or service disruption. Target a 3-6 month holding period; invalidate if PL reaffirms satellite-life and capex guidance while launch/replacement costs remain stable.
• Maintain a watch alert around major geomagnetic-storm forecasts and subsequent operator disclosures. A confirmed constellation-loss or launch-schedule impact would be incrementally bullish RKLB and defense-space suppliers LMT/NOC, but the trade requires evidence of contracted demand rather than media attention.
• For PL, monitor quarterly spacecraft impairment, depreciation-life assumptions, insurance expense, and capex-to-revenue conversion. A sustained increase in these metrics without corresponding subscription growth would support a downside thesis; unchanged metrics falsify it.