// Live Mission Tracker
Expedition 74
in orbit right now.
Crew Aboard
7
humans off-Earth
Day of Rotation
120
4 months in
Altitude
431 km
267 mi above Earth
Orbital Velocity
27.6 k km/h
~17,150 mph
// Crew Manifest
The seven humans currently in orbit.
Pulled live from Launch Library 2.
Sergey Kud-Sverchkov
Roscosmos
Christopher Williams
NASA
Jack Hathaway
NASA
Sergey Mikayev
Roscosmos
Sophie Adenot
ESA
Andrei Fedyaev
Roscosmos
Jessica Meir
NASA
// HSS Framework Output
What the model says about right now.
These figures are computed by running the live expedition data through the HSS framework. NASA does not publish live physiological readings on active crew — these are modeled estimates, not measurements.
// Mission Viability
83
/100
Stable
The model places the current expedition well within feasibility thresholds. Mature ISS systems, high exercise compliance (~90%), advanced water and oxygen recycling, and a small balanced crew put this expedition in the range the model considers operationally stable.
// Modeled Psychological Strain
29.4
/100
Phase: Endurance
At day 120, the model estimates the crew is in the endurance phase. Analog studies place faction formation onset around day 90, followed by routine fatigue and motivation dips into day 120+.
// Physical Condition (Modeled)
73.6
/100
~3.3% bone loss to date
With ISS exercise compliance averaging 90% (~2 hours per crew member per day), bone loss is partially offset but still accumulates at roughly 0.75% per month of mission time.
// Modeled Cumulative Consumables
Computed for 7 crew × 120 days using HSS baseline rates. The recycling delta is the difference between what would have to be launched without recycling vs. what the ISS actually carries.
// Methodology & Sources
How this page is built.
The expedition name, crew list, and start date are pulled directly from the public Launch Library 2 API. The ISS altitude, velocity, and current orbital position are pulled from wheretheiss.at. Both feeds are cached server-side and refreshed hourly.
Every other figure on this page — the modeled feasibility score, the stress estimate, the physical condition score, the modeled consumables — is computed by running the live inputs through the HSS framework. NASA does not publish live physiological readings, water-balance ledgers, or crew psychology assessments for active expeditions. The numbers shown here are what the model estimates should be true given the public expedition parameters and known ISS operational baselines (water recycling ~93%, oxygen recycling ~85%, exercise compliance ~90%).
If you spot an error — wrong crew member, outdated rate constant, missing data — tell us. Corrections are made openly with credit.
See what the framework predicts
for any other crew, any other duration.
The Scenario Engine runs the same math the live tracker uses, but lets you set the inputs.
Run a Scenario