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Voyager Status, What is it?
Bernard1963
post Sep 24 2019, 11:25 AM
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I should have noted that around the 7th September there was a sun sensor calibration and ASCAL which does appear to have fixed the pointing issue and the signal into the DSN has been as expected since then. However as this was the 2nd such incident in the past 6 months I wonder if the sun sensor is having trouble keeping a lock on the sun, now at 147AU.
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Bernard1963
post Jan 28 2020, 12:39 PM
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With info taken from one of the controllers at Canberra on twitter and my observations from https://eyes.nasa.gov/dsn/dsn.html, Voyager 2 was lost for a period of 5-10minutes in the early hours of 26/01/20 while attempting a MAGROL. It looks like an attitude control issue occurred causing the S/C to go off point from the earth. I'm assuming the fault protection kicked in and got the S/C back on point fairly quickly. The S/C was then in engineering mode 40bps rather than the usual 160bps. Even though the Voyager tracking schedule showed no further tracking, later in the day Canberras DSS43 70m dish was tracking and the Canberra website showed a horizon to horizon track was taking place. Its therefore reasonable to assume a spacecraft emergency had been declared with other missions being moved off of DSS43. Checking the most recent track earlier today Voyager 2 remains at 40bps (engineering mode).
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stevesliva
post Jan 28 2020, 03:17 PM
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My brain is hurting because morning in Canberra is so many hours before here, but it sounds like the most recent tracking was to determine whether the commands sent "later in the day" were received. Round trip time is so slow that this seems fast.
DSN antenna DSS-43 at @CanberraDSN opening a 3-1/2 hour listening window to see if recent emergency XMIT was received
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Bernard1963
post Jan 29 2020, 06:48 AM
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https://www.jpl.nasa.gov/news/news.php?feature=7587
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Roby72
post Feb 2 2020, 09:35 PM
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Canberra still tracking VGR2 at 39bits/sec as of February 2nd, 21h30UT as seen in DSN NOW
Now one week gap of science data.
Any thoughts ?
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stevesliva
post Feb 3 2020, 04:11 AM
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QUOTE (Roby72 @ Feb 2 2020, 04:35 PM) *
Canberra still tracking VGR2 at 39bits/sec as of February 2nd, 21h30UT as seen in DSN NOW
Now one week gap of science data.
Any thoughts ?

Data rate should be back all the way up to 160 now.
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stevesliva
post Aug 23 2020, 02:52 AM
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There was a post from climber in a another thread about the Canberra DSN 70m 11mo shutdown, but this one continues discussion about the V2 anomaly... so, here is an informative now 5-months-old article from the paywalled NY Times:
https://www.nytimes.com/2020/03/04/science/...ce-network.html

It is spurred by the DSN maintenance, but has some interesting commentary about the anomaly. Nice to see reporters finding who to ring up, and talking to them.
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Explorer1
post Nov 3 2020, 12:58 AM
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Voyager 2 is doing well! DSN maintenance has progressed to the point that they have commanded (and heard back) from it after the hiatus.
https://www.nasa.gov/feature/jpl/nasa-conta...ce-network-dish
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Liss
post Aug 17 2021, 01:32 PM
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According to SFOS schedules, first steps in Voyager energy plan has been executed.
LECP MAIN SUPPLEMENTAL HEATER OFF commands were sent and implemented:
* to Voyager 2 -- on 22/23 Feb 2021;
* to Voyager 1 -- on 16 May 2021.

Confirmed at https://voyager-mac.umd.edu/docs/
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stevesliva
post Aug 17 2021, 04:26 PM
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Tweet from @NSFVoyager2 on Feb22 confirms it, too:
https://twitter.com/NSFVoyager2/status/1364410980927741952

QUOTE
Shutting off the main supplemental heater for the Low Energy Charged Particle instrument to save power. PWR LECP MAIN SUPP HTR OFF


I did get stuck on the tangent about why they're dealing with a "damaged tracking loop capacitor." Apparently they've been dealing with it since 1978. (Primary failed, and backup is a bit wonky.)
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stevesliva
post May 19 2022, 02:33 AM
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Voyager 1 sending odd telemetry, acting normally:
https://www.jpl.nasa.gov/news/engineers-inv...-telemetry-data

Never too late to learn a new language, they say.
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stevesliva
post Jun 26 2023, 03:25 PM
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https://www.jpl.nasa.gov/news/nasas-voyager...-power-strategy

This original report from April, but I've seen it re-reported a few places including another today.

They have bypassed a voltage regulator on V2, and the need to not have headroom for the regulator means that a planned instrument shutoff in 2023 can be postponed until 2026.
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stevesliva
post Jul 31 2023, 02:32 AM
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Some sort of commanding error means V2 isn't pointing antenna at earth. Should reset pointing October 15th:
https://www.jpl.nasa.gov/news/nasa-mission-...nications-pause
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climber
post Aug 1 2023, 06:38 AM
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It looks like DSN has picked up a carrier signal smile.gif


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climber
post Aug 4 2023, 08:35 PM
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Voyager II, the best of the best is back on line : https://www.jpl.nasa.gov/news/nasa-mission-...nications-pause


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