Low-cost precursor of an interstellar mission
arXiv:2007.12814 · doi:10.1051/0004-6361/202038687
Abstract
The solar photon pressure provides a viable source of thrust for spacecraft in the solar system. Theoretically it could also enable interstellar missions, but an extremely small mass per cross section area is required to overcome the solar gravity. We identify aerographite, a synthetic carbon-based foam with a density of 0.18 kg/m^3 (15,000 times more lightweight than aluminum) as a versatile material for highly efficient propulsion with sunlight. A hollow aerographite sphere with a shell thickness eps_shl = 1 mm could go interstellar upon submission to the solar radiation in interplanetary space. Upon launch at 1 AU from the Sun, an aerographite shell with eps_shl = 0.5 mm arrives at the orbit of Mars in 60 d and at Pluto's orbit in 4.3 yr. Release of an aerographite hollow sphere, whose shell is 1 micrometer thick, at 0.04 AU (the closest approach of the Parker Solar Probe) results in an escape speed of nearly 6900 km/s and 185 yr of travel to the distance of our nearest star, Proxima Centauri. The infrared signature of a meter-sized aerographite sail could be observed with JWST up to 2 AU from the Sun, beyond the orbit of Mars. An aerographite hollow sphere with eps_shl = 100 micrometer and a radius of 1 m (5 m) weighs 230 mg (5.7 g) and has a 2.2 g (55 g) mass margin for interstellar escape. The payload margin is ten times the mass of the spacecraft, whereas the payload on chemical interstellar rockets is typically a thousandth of the weight of the rocket. Simplistic communication would enable studies of the interplanetary medium and a search for the suspected Planet Nine, and would serve as a precursor mission to alpha Centauri. We estimate prototype developments costs of 1 million USD, a price of 1000 USD per sail, and a total of <10 million USD including launch for a piggyback concept with an interplanetary mission.
accepted in A&A, 13 pages, 9 Figures (6 col, 3 b/w), 1 Table
References in corpus (11)
- Universal Dynamic Conductivity and Quantized Visible Opacity of Suspended Graphene
- New evolutionary models for pre-main sequence and main sequence low-mass stars down to the hydrogen-burning limit
- A terrestrial planet candidate in a temperate orbit around Proxima Centauri
- Manipulating infrared photons using plasmons in transparent graphene superlattices
- Proxima's orbit around Alpha Centauri
- Stability of a Light Sail Riding on a Laser Beam
- Deceleration of high-velocity interstellar photon sails into bound orbits at Centauri
- Interferometric Measurement of Acceleration at Relativistic Speeds
- Can Planet Nine Be Detected Gravitationally by a Sub-Relativistic Spacecraft?
- Searching for a Black Hole in the Outer Solar System
- A Starshot Communication Downlink