Pythom

Pythom, doing business as Pythom Inc., is a privately held Swedish-American aerospace company headquartered in Bishop, California. Founded in 2020 by married professional explorers and software engineers Tina Sjögren and Tom Sjögren, the company is developing an integrated human-rated space transportation system rather than a single launch vehicle. Its stated long-term ambition is to support exploration missions involving Earth orbit, the Moon, Mars and asteroids, with public aspirations of reaching Mars before the end of the 2020s. The company’s origins combine extreme-environment exploration with communications and aerospace engineering. Sjögren and Sjögren led expeditions including an ascent of Mount Everest in 1999, an unsupported ski expedition from the edge of Antarctica to the South Pole in 2001–2002, and an expedition from Canada to the North Pole in 2002. During these activities they developed lightweight satellite-communications software and hardware. Those technologies subsequently became a business serving customers described as including NASA, nongovernmental organizations, defense units and extreme explorers. Pythom’s founders present this experience as a basis for designing equipment and operations for remote, infrastructure-limited environments. Pythom entered the launch-vehicle field through the 2020 DARPA Launch Challenge. Its Eiger rocket was selected as one of ten finalists from 55 participating teams. The challenge sought a launch system capable of responding rapidly and operating with limited fixed infrastructure, an objective that shaped Eiger’s compact and mobile design philosophy. The competition ultimately ended without a winner. Pythom was established during the same year, initially to develop Eiger and later to expand into a broader space transportation architecture. The company’s propulsion approach is centered on the proprietary Black Magic cyclic pressure system and storable propellants. Pythom says the system is intended to support multiple mission phases without requiring a complete change of propulsion technology. Its Asterex engine family is described as additively manufactured in Inconel and regeneratively cooled. The initial Eiger vehicle is planned as a small orbital launcher, while the larger Kang vehicle is intended to support heavier payloads and eventually human-rated missions. The Olympus lander and a conceptual Pythom spaceship extend the architecture beyond launch into transportation between orbit and planetary or small-body surfaces. Pythom received seed funding from Space Cowboys, a Swedish investment vehicle created to back the company. Publicly disclosed development activity has included propulsion testing and a March 2022 hold-down test of Eiger’s first stage at the company’s Bishop facilities. That test attracted criticism from some aerospace professionals regarding safety precautions. Pythom rejected the criticism and stated that it had maintained a clean personnel and environmental safety record during its propulsion work since 2020. The incident remains part of the company’s public development narrative, although the available material does not establish a formal regulatory finding or an accident. Pythom remains in development and has not been described in the supplied reference material as having achieved orbital launch, human spaceflight or operational commercial service. Its positioning is that of an ambitious, vertically integrated exploration company seeking to combine low-cost launch, reusable or repurposed space hardware concepts, storable-propellant propulsion and small-team expeditionary operations.

Pythom was founded in 2020 by Tina Sjögren and Tom Sjögren, a married couple whose backgrounds combine software engineering, professional exploration and remote-environment communications. Before forming the aerospace company, the two led demanding expeditions in polar and high-altitude environments. They summited Mount Everest in 1999, skied unsupported from the edge of Antarctica to the South Pole in 2001–2002, and completed an expedition from Canada to the North Pole in 2002. Their expedition work included the creation of lightweight satellite-communications software and hardware, which later developed into a business serving customers identified in the company’s historical account as including NASA, nongovernmental organizations, defense units and extreme explorers. The founders’ experience with difficult logistics and limited infrastructure influenced Pythom’s aerospace strategy. Rather than limiting its scope to a single rocket, the company set out to develop a complete transportation system for human exploration of the Solar System. The architecture is intended to use relatively small and agile teams, lightweight equipment and propulsion technologies that can remain useful across different mission phases. Pythom’s stated destinations include Earth orbit, the Moon, Mars and asteroids, and the company has publicly expressed an aspiration to reach Mars before the end of the 2020s. Pythom’s first major public launch-vehicle milestone came through the DARPA Launch Challenge in 2020. The challenge was designed around the ability to launch rapidly and from different locations with minimal infrastructure. Pythom entered with its Eiger concept, which was selected as one of ten finalists from 55 teams. The competition ultimately ended without a winner, but the finalist selection gave the young company visibility in the small-launch sector. Pythom was established in the same year to develop Eiger and to provide a corporate structure for its broader space-transportation ambitions. The company’s propulsion family is organized around the Black Magic cyclic pressure system and storable propellants. Pythom describes Black Magic as a proprietary approach intended to support missions without replacing the propulsion technology at each stage. Its Asterex engine is a 12-kilonewton, double-walled, regeneratively cooled engine designed for additive manufacture in Inconel. The company has stated that its propulsion work reached a chamber pressure of 10 MPa, though the supplied reference does not provide an independently verified test report. The engine and pressure-system concepts are intended to support both launch vehicles and deep-space vehicles. Eiger is Pythom’s first orbital-launch vehicle under development. It is designed as a small launcher using a first-stage cluster of nine Asterex engines and a single Asterex vacuum engine on the second stage. Both stages are described as using storable nitric-acid oxidizer and furfuryl-alcohol fuel. The company’s design objective is to provide orbital launch with limited infrastructure and operational flexibility. After Eiger, Pythom has described Kang, a substantially larger rocket intended to carry heavier payloads and ultimately support human-rated missions. Kang is named after Kangchenjunga, the world’s third-highest mountain. Pythom’s planned transportation system also includes the Olympus lander. Olympus is intended to carry people and cargo between a spacecraft and the surfaces of planets, moons or asteroids, using a cluster of five Asterex engines. The company has additionally presented a conceptual Pythom spaceship assembled from used upper stages of Eiger and Kang in Earth orbit. The concept incorporates rotation for artificial gravity and is intended to simulate different gravitational environments by changing the length and rotation speed of its spokes. Funding has included seed investment from Space Cowboys, a Swedish special-purpose investment vehicle formed to invest in Pythom and subsequently expanded. Pythom’s principal development facilities are in Bishop, California. In March 2022, the company conducted a hold-down test of Eiger’s first stage. Industry professionals criticized the apparent safety precautions surrounding the test. Pythom rejected those concerns and asserted that it had maintained a clean personnel and environmental safety record throughout its propulsion testing since 2020. The available material does not document a resulting accident, enforcement action or formal finding. Pythom remains an aerospace company in the development phase. The supplied references do not establish an orbital launch, operational spacecraft service, human flight or completed Mars mission. Its public identity is therefore based primarily on its proposed vehicles, propulsion research, founders’ exploration background and long-term ambition to create an integrated human space-transportation system.

• 2022

  Eiger first-stage hold-down test

  [1]Pythomen.wikipedia.org

  Pythom performed a hold-down test of Eiger’s first stage at its Bishop development facilities.

• 2020

  Eiger becomes a DARPA Launch Challenge finalist

  [1]Pythomen.wikipedia.org

  Pythom’s Eiger rocket was chosen as one of ten finalists from 55 teams in the DARPA Launch Challenge.

• 2020

  Pythom is established

  [1]Pythomen.wikipedia.org

  Tina and Tom Sjögren founded Pythom to develop Eiger and a broader human space-transportation system.

• 2002

  Polar exploration and communications work

  [1]Pythomen.wikipedia.org

  The founders completed a Canada-to-North Pole expedition and developed lightweight satellite-communications technologies through their exploration activities.

• 2001

  Unsupported Antarctic ski expedition begins

  [1]Pythomen.wikipedia.org

  The Sjögrens began an unsupported ski expedition from the edge of Antarctica to the South Pole, completed across 2001–2002.

• 1999

  Founders lead an Everest expedition

  [1]Pythomen.wikipedia.org

  Tina and Tom Sjögren summited Mount Everest as expedition leaders, part of the exploration background later associated with Pythom’s operating philosophy.

Pythom positions itself as an expedition-oriented aerospace developer pursuing a complete, relatively lightweight and infrastructure-efficient transportation system for human exploration beyond Earth. Its concept emphasizes storable propellants, common propulsion principles across mission phases, small agile teams and lower-cost access to orbit and deep-space destinations.

• Rocket propulsion system

  Black Magic propulsion system

  Black Magic is Pythom’s proprietary cyclic pressure propulsion concept. The company says it is designed around storable propellants and intended to support an entire mission architecture without requiring a different propulsion technology for each phase. Pythom has described testing the system to a chamber pressure of 10 MPa. The system is intended to serve the company’s launch vehicles, lander and deep-space transportation concepts.

• Rocket engine

  Asterex engine

  Asterex is a 12-kilonewton rocket-engine design using a double-walled, regeneratively cooled configuration. Pythom describes the engine as mathematically designed and additively manufactured in Inconel. Versions are intended for both atmospheric launch stages and vacuum operation. The engine is the common propulsion element proposed for Eiger, Kang and Olympus.

• Orbital launch vehicle

  Eiger rocket

  Eiger is Pythom’s first orbital launch vehicle under development and was a finalist design in the DARPA Launch Challenge. Its planned configuration uses nine Asterex engines on the first stage and one Asterex vacuum engine on the second stage. The vehicle is designed around storable propellants and limited ground infrastructure, reflecting the company’s goal of flexible launch operations.

• Heavy-lift and human-rated launch vehicle

  Kang rocket

  Kang is a larger launch vehicle planned to follow Eiger. Pythom describes it as approximately 30 metres tall and intended to carry substantially heavier payloads to low Earth orbit. The design is also intended to become a human-rated launch vehicle. It is named after Kangchenjunga, the world’s third-highest mountain.

• Planetary and asteroid lander

  Olympus lander

  Olympus is a lander concept designed to transport people and cargo between a spacecraft and the surfaces of planets, moons and asteroids. It is planned to use the Black Magic propulsion system with a cluster of five Asterex engines. The vehicle is named after Olympus Mons on Mars, the largest and highest mountain in the Solar System.

• Deep-space spacecraft concept

  Pythom spaceship

  The Pythom spaceship is a conceptual vehicle assembled from used upper stages of Eiger and Kang in Earth orbit. Its design includes rotation to create artificial gravity, with different simulated gravity environments produced by varying spoke length and rotational speed. The concept is intended to support transportation and habitation during extended human missions beyond Earth.

• 2020

  Adopt an integrated Solar System transportation strategyStrategy

  Background

  After entering the small-launch field with Eiger, Pythom broadened its stated objective to include launch vehicles, a human-rated rocket, a planetary lander and a deep-space spacecraft.

  Action taken

  The company organized its development vision around a common propulsion approach and a family of vehicles for Earth orbit, the Moon, Mars and asteroids.

  Aftermath

  Pythom continued presenting Eiger, Kang, Olympus and the Pythom spaceship as parts of one exploration architecture. The supplied material does not establish operational deployment.

  Source

• 2020

  Prioritize storable-propellant and common-propulsion conceptsStrategy

  Background

  Pythom sought a transportation system suited to remote operations and missions requiring limited infrastructure.

  Action taken

  The company developed the Black Magic propulsion concept and Asterex engine family around storable propellants intended for use across multiple vehicle types.

  Aftermath

  The propulsion approach became the technical basis described for Eiger, Kang and Olympus.

  Source

1. 1Pythomen.wikipedia.org