The Stanford University Dish some 46m or 150′ in diameter was erected in 1961 and became one of world’s largest dish antennas, even today. The Dish was commissioned by the Stanford Research Institute that later became SRI International. This fact made complete sense when one was standing at the control position and proudly posted on the console was the amateur radio call-sign of W6SRI. The dish is primarily used to support spacecraft operation as it is located in an electrically noisy area limiting radio astronomy work.
GOES-S was launched on March 1, 2018 into a Geostationary Transfer Orbit (GTO). This mission unlike many we follow was not classified but does use the Lockheed Martin A2100 satellite bus. A favourite of the US military, so studying it on a non-classified mission could prove interesting.
Just when everyone thought the story of IMAGE was going to have a Hollywood ending she has displayed a knack for dramatic flare.
On 2018-02-25 at 02:19:19.459 UTC IMAGE ended an approximately 48 hour series of off/on sequences of its TT&C beacon and returned to silence. It’s been over two days now and the beacon has not returned to the air.
The signal sequence in the image above shows the last few minutes of IMAGE’s transmissions. Continue reading “Space Strikes Back, IMAGE Returns to Silence…”
We have received a lot of responses to the recovery of IMAGE. It would be difficult to respond in great detail to each request so we have taken the time to compile some references to help our readers understand what we do and allow you to explore the world of satellite tracking based on the input of our colleagues in the hobby as well.
Over the past week the station has been dedicated to an S-band scan looking for new targets and refreshing the frequency list, triggered by the recent launch of the mysterious ZUMA mission. This tends to be a semi-annual activity as it can eat up a lot of observing resources even with much of the data gathering automated the data reviewing is tedious.
Upon reviewing the data from January 20, 2018, I noticed a curve consistent with an satellite in High Earth Orbit (HEO) on 2275.905MHz, darn not ZUMA… This is not uncommon during these searches. So I set to work to identify the source.
A quick identity scan using ‘strf’ (sat tools rf) revealed the signal to come from 2000-017A, 26113, called IMAGE.
A Delta IV rocket launched the classified NROL-47 satellite from Vandenberg in California on January 12, 2018. The satellite is believed to be the 5th member of the Topaz (FIA Radar) project, radar satellites operating in 1100km altitude, 123 degree inclined retrograde orbits. Broadcast warnings for the NROL-47 launch placed the impact areas of the solid rocket motors, the first stage and the de-orbit area of the second stage at markedly different locations than with previous Topaz launches, indicating an orbital inclination around 108 degrees. Hence, it was not clear if NROL-47 is a Topaz satellite. Continue reading “NROL-47 transmits at S-band”