A communications satellite that had remained dormant for six decades began emitting unexpected radio signals in June 2024. Relay 2, launched by NASA in 1964, was detected by the ASKAP radio telescope (Australian Square Kilometre Array Pathfinder) on Austrália. The discovery surprised scientists, who did not expect any activity from the equipment after so many years in orbit. The researchers published the results in the journal The Astrophysical Journal Letters on June 30, 2024.
Detecção signal through modern technology
Astronomer Clancy James and his team used the ASKAP radio telescope to identify the signal. The equipment detected 36 radio pulses at specific frequencies, with three-minute intervals between each transmission. The researchers analyzed the data precisely and were able to trace the origin of the signal to the old satellite. The analysis revealed unique characteristics of the emission pattern, allowing scientists to confirm the origin of Relay 2.
James estimated that the signal travels more than a thousand times the distance between Terra and Lua. The satellite transmits signals every 30 seconds, lasting three minutes each. The signal strength varies between 2 thousand and 3 thousand measurement units. The researchers observed that the emission pattern is consistent and well-defined, different from random interference.
Histórico from satellite Relay 2
NASA launched Relay 2 in 1964 as part of a communications satellite program. The equipment operated for two years in normal operation, transmitting television signals and data between continents. Após During this initial period, the satellite was deactivated and remained in orbit without any known transmissions. Durante three decades, no activity has been recorded on the equipment.
The satellite is located at approximately 4,500 kilometers altitude. Essa specific orbital position allowed Relay 2 to remain in stable orbit for six decades. Scientists believe current transmission may be related to physical processes occurring in aging equipment. James and his team consider the discovery as evidence that old satellites can exhibit unexpected behaviors even after long periods of inactivity.
Características detected signal techniques
- Frequência emission compatible with satellite communications systems from the 1960s.
- Padrão pulses regularly at three-minute intervals, suggesting that electronic components still partially function despite the satellite’s advanced age.
James and his colleagues point out that the precise origin of the signal remains a scientific mystery. The possibility that old batteries still store energy or that electronic components function unexpectedly raises important questions about the durability of space equipment. The researchers plan to continue monitoring Relay 2 to collect more data on this phenomenon.
Implicações for future space research
The detection of Relay 2’s signal demonstrates that old satellites can remain functional in unforeseen ways. Scientists recognize that this discovery opens up new possibilities for understanding the behavior of equipment in orbit after prolonged periods of inactivity. Continuous satellite monitoring can reveal valuable information about degradation of electronic components in the space environment.
The research team plans to use future data to investigate whether other decommissioned satellites also emit similar signals. Essa line of research can contribute to improving long-duration satellite designs and better understanding how old equipment behaves after decades in orbit. The discovery reinforces the importance of constantly monitoring the orbital space close to Terra.
