I didn't find any way to quickly calculate the redshift, but as an order of magnitude estimate I interpreted your ballpark figure as the signal had red shifted to 40% of its original frequency. That puts the original "broadcast" in the neighborhood of 16.5MHz, so it's probably been hanging out in that same part of the RF spectrum for the last ~3 billion years.
Anyone feel like tackling the question of what was the original broadcast signal power?
It's mostly smear/noise and dirty uncalibrated optics, but this is the closest (1641km) image we'll get of Saturn until we send an atmospheric probe there one day. Cassini's final image uplink will be done on the 14th before it's reconfigured to send telemetry live as it's collected on it's final dive into the clouds.
Just because its going to be incredible to see if the falcon heavy can land all three boosters in one launch. One of the best videos regarding the F9 on youtube. Not new, but worth a (re)watch. Cassini we hardly knew you.
The Voyagers have explored the far reaches of our solar system, and Voyager 1 entered interstellar space in August 2012. Exactly where the solar system ends depends on the criteria used to define it.
This visualization tracks the trajectory of the Voyager 1 spacecraft through the solar system. Launched on Sept. 5, 1977, it was one of two spacecraft sent to visit the giant planets of the outer solar system. Voyager 1 flew by Jupiter and Saturn before being directed out of the solar system.
This visualization tracks the trajectory of the Voyager 2 spacecraft through the solar system. Launched on Aug. 20, 1977, it was one of two spacecraft sent to visit the giant planets of the outer solar system. Like Voyager 1, Voyager 2 flew by Jupiter and Saturn, but the Voyager 2 mission was extended to fly by Uranus and Neptune before being directed out of the solar system.