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PostPosted: Wed Jan 17, 2018 11:01 am 
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Location: Gilford Park
NASA test proves pulsars can function as a celestial GPS

https://www.nature.com/articles/d41586-018-00478-8

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Experiment shows how spacecraft could use stellar signals to navigate in deep space without human instruction.

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PostPosted: Fri Feb 02, 2018 11:13 pm 
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Looking back at the Hulse-Taylor Binary Pulsar

https://astrobites.org/2018/02/02/looki ... ry-pulsar/

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Initial measurements of the periodicity of the pulsar were perplexing as it varied between 8 – 80 μs on time scales as short as minutes, whereas any other previously cataloged pulsar varied at a fraction of this over years. The cause of this changing pulse period they determined to be due to the doppler shift caused by some kind of orbital motion. By looking at the pulse rate they were able to get a radial velocity measurement. Figure 1 shows this measurement where when the radial velocity is < 0 the pulsar is in the part of it’s orbit where it’s moving towards Earth (blueshifted) and the opposite for velocities > 0 (redshifted). Additionally through these measurements they were able to determine that the non-visible companion to the pulsar is approximately similar in mass.

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