http://theconversation.com/australia-is-still-listening-to-voyager-2-as-nasa-confirms-the-probe-is-now-in-interstellar-space-108507

NASA has confirmed that Voyager 2 has joined its twin to become only the second spacecraft to enter interstellar space – where the Sun’s flow of material and magnetic field no longer affect its surroundings. The slightly faster Voyager 1 entered interstellar space in August 2012.

Data from Voyager 2 indicate an increase in the rate of cosmic rays hitting the spacecraft’s detectors. These fast-moving particles are known to originate outside our solar system.

Voyager 1 experienced a similar increase about three months before it crossed the heliopause, the boundary of the heliosphere.

Scientists for Voyager 2 detected a steep drop in the speed of solar wind particles on November 5, and no solar wind flow at all in the spacecraft’s environment since then. This makes them confident the spacecraft has entered interstellar space.

Unfortunately not all of Voyager 2’s instruments are still operational. Its on-board data recorder failed many years ago, leaving the spacecraft with no option other than to transmit all of its data back to Earth in real time.

NASA’s Canberra Deep Space Communication Complex (CDSCC), operated by CSIRO, has been providing command, telemetry and control for the twin Voyager spacecraft since their launch in 1977.

Voyager 2 is roughly 120 times that between the Sun and the Earth and transmits with a power of just 20 watts.

After a week of testing, on November 8 the Parkes radio telescope started tracking Voyager 2 for 11 hours a day – the entire period it is above the local horizon.

VOYAGER 2’S JOURNEY ACROSS THE SOLAR SYSTEM
20 August 1977 – Launched from Earth at Cape Canaveral
July 1979 – fly by Jupiter
August 1981 – fly by Saturn
January 1986 – fly by Uranus

Racing through interstellar space, both spacecraft will continue on their respective trajectories, Voyager 1 at 61,198kph (16.999km per second) and Voyager 2 at 55,347kph (15.374km per second).

mollwollfumble said:

Unfortunately not all of Voyager 2’s instruments are still operational. Its on-board data recorder failed many years ago, leaving the spacecraft with no option other than to transmit all of its data back to Earth in real time.

I’m amazed any instruments aboard the Voyagers still work!

So this recorder… does that mean Voyager 2 transmitted all its stored data at once and now it transmits in dribs and drabs as it collects data?

Divine Angel said:

mollwollfumble said:

Unfortunately not all of Voyager 2’s instruments are still operational. Its on-board data recorder failed many years ago, leaving the spacecraft with no option other than to transmit all of its data back to Earth in real time.

I’m amazed any instruments aboard the Voyagers still work!

So this recorder… does that mean Voyager 2 transmitted all its stored data at once and now it transmits in dribs and drabs as it collects data?

Amazement shared.

Yes. It used to store it’s data between transmissions. Then transmit its stored data when asked for it. Now it only transmits what it’s observing at the same time as it observed it.

Wait. It uses a tape recorder? Data is stored on a tape recorder between transmissions.

This is the future for Voyager 1.

Year End of specific capabilities as a result of the available electrical power limitations
2007 Termination of plasma subsystem (PLS)
2008 Power off Planetary Radio Astronomy Experiment (PRA)
2016 Termination of scan platform and Ultraviolet Spectrometer (UVS) observations
2018 approx. Termination of Data Tape Recorder (DTR) operations (limited by ability to capture 1.4 kbit/s data using a 70 m/34 m antenna array; this is the minimum rate at which the DTR can read out data)
2019–2020 approx. Termination of gyroscopic operations (previously 2017, but backup thrusters active for continuation of gyroscopic operations.)
2020 Start shutdown of science instruments (as of October 18, 2010 the order is undecided, however the Low-Energy Charged Particles, Cosmic Ray Subsystem, Magnetometer, and Plasma Wave Subsystem instruments are expected to still be operating)
2025–2030 Will no longer be able to power even a single instrument.

mollwollfumble said:

http://theconversation.com/australia-is-still-listening-to-voyager-2-as-nasa-confirms-the-probe-is-now-in-interstellar-space-108507

NASA has confirmed that Voyager 2 has joined its twin to become only the second spacecraft to enter interstellar space – where the Sun’s flow of material and magnetic field no longer affect its surroundings. The slightly faster Voyager 1 entered interstellar space in August 2012.

Data from Voyager 2 indicate an increase in the rate of cosmic rays hitting the spacecraft’s detectors. These fast-moving particles are known to originate outside our solar system.

Voyager 1 experienced a similar increase about three months before it crossed the heliopause, the boundary of the heliosphere.

Scientists for Voyager 2 detected a steep drop in the speed of solar wind particles on November 5, and no solar wind flow at all in the spacecraft’s environment since then. This makes them confident the spacecraft has entered interstellar space.

Unfortunately not all of Voyager 2’s instruments are still operational. Its on-board data recorder failed many years ago, leaving the spacecraft with no option other than to transmit all of its data back to Earth in real time.

NASA’s Canberra Deep Space Communication Complex (CDSCC), operated by CSIRO, has been providing command, telemetry and control for the twin Voyager spacecraft since their launch in 1977.

Voyager 2 is roughly 120 times that between the Sun and the Earth and transmits with a power of just 20 watts.

After a week of testing, on November 8 the Parkes radio telescope started tracking Voyager 2 for 11 hours a day – the entire period it is above the local horizon.

VOYAGER 2’S JOURNEY ACROSS THE SOLAR SYSTEM
20 August 1977 – Launched from Earth at Cape Canaveral
July 1979 – fly by Jupiter
August 1981 – fly by Saturn
January 1986 – fly by Uranus

Racing through interstellar space, both spacecraft will continue on their respective trajectories, Voyager 1 at 61,198kph (16.999km per second) and Voyager 2 at 55,347kph (15.374km per second).

How did they work up to those speeds, slingshot?

Peak Warming Man said:

mollwollfumble said:

http://theconversation.com/australia-is-still-listening-to-voyager-2-as-nasa-confirms-the-probe-is-now-in-interstellar-space-108507

NASA has confirmed that Voyager 2 has joined its twin to become only the second spacecraft to enter interstellar space – where the Sun’s flow of material and magnetic field no longer affect its surroundings. The slightly faster Voyager 1 entered interstellar space in August 2012.

Data from Voyager 2 indicate an increase in the rate of cosmic rays hitting the spacecraft’s detectors. These fast-moving particles are known to originate outside our solar system.

Voyager 1 experienced a similar increase about three months before it crossed the heliopause, the boundary of the heliosphere.

Scientists for Voyager 2 detected a steep drop in the speed of solar wind particles on November 5, and no solar wind flow at all in the spacecraft’s environment since then. This makes them confident the spacecraft has entered interstellar space.

Unfortunately not all of Voyager 2’s instruments are still operational. Its on-board data recorder failed many years ago, leaving the spacecraft with no option other than to transmit all of its data back to Earth in real time.

NASA’s Canberra Deep Space Communication Complex (CDSCC), operated by CSIRO, has been providing command, telemetry and control for the twin Voyager spacecraft since their launch in 1977.

Voyager 2 is roughly 120 times that between the Sun and the Earth and transmits with a power of just 20 watts.

After a week of testing, on November 8 the Parkes radio telescope started tracking Voyager 2 for 11 hours a day – the entire period it is above the local horizon.

VOYAGER 2’S JOURNEY ACROSS THE SOLAR SYSTEM
20 August 1977 – Launched from Earth at Cape Canaveral
July 1979 – fly by Jupiter
August 1981 – fly by Saturn
January 1986 – fly by Uranus

Racing through interstellar space, both spacecraft will continue on their respective trajectories, Voyager 1 at 61,198kph (16.999km per second) and Voyager 2 at 55,347kph (15.374km per second).

How did they work up to those speeds, slingshot?

Yep.

https://voyager.jpl.nasa.gov/downloads/

Peak Warming Man said:

mollwollfumble said:

http://theconversation.com/australia-is-still-listening-to-voyager-2-as-nasa-confirms-the-probe-is-now-in-interstellar-space-108507

NASA has confirmed that Voyager 2 has joined its twin to become only the second spacecraft to enter interstellar space – where the Sun’s flow of material and magnetic field no longer affect its surroundings. The slightly faster Voyager 1 entered interstellar space in August 2012.

Data from Voyager 2 indicate an increase in the rate of cosmic rays hitting the spacecraft’s detectors. These fast-moving particles are known to originate outside our solar system.

Voyager 1 experienced a similar increase about three months before it crossed the heliopause, the boundary of the heliosphere.

Scientists for Voyager 2 detected a steep drop in the speed of solar wind particles on November 5, and no solar wind flow at all in the spacecraft’s environment since then. This makes them confident the spacecraft has entered interstellar space.

Unfortunately not all of Voyager 2’s instruments are still operational. Its on-board data recorder failed many years ago, leaving the spacecraft with no option other than to transmit all of its data back to Earth in real time.

NASA’s Canberra Deep Space Communication Complex (CDSCC), operated by CSIRO, has been providing command, telemetry and control for the twin Voyager spacecraft since their launch in 1977.

Voyager 2 is roughly 120 times that between the Sun and the Earth and transmits with a power of just 20 watts.

After a week of testing, on November 8 the Parkes radio telescope started tracking Voyager 2 for 11 hours a day – the entire period it is above the local horizon.

VOYAGER 2’S JOURNEY ACROSS THE SOLAR SYSTEM
20 August 1977 – Launched from Earth at Cape Canaveral
July 1979 – fly by Jupiter
August 1981 – fly by Saturn
January 1986 – fly by Uranus

Racing through interstellar space, both spacecraft will continue on their respective trajectories, Voyager 1 at 61,198kph (16.999km per second) and Voyager 2 at 55,347kph (15.374km per second).

How did they work up to those speeds, slingshot?

There’s a graph on Wikipedia.

https://en.m.wikipedia.org/wiki/File:Voyager_2_velocity_vs_distance_from_sun.svg

Slingshots past Jupiter, Saturn, Uranus speeded it up. Slingshot past Neptune slowed it down.

TRD around?
I’ve got a spreadsheet I need to import into Access; two fields need to be the primary keys in that, but in the spreadsheet they’re repeated, probably on four lines, but possibly more. I can combine them, but there are some part numbers on each of them that are different, and would need to be kept, together with the quantity (which is in a different column.)

To summarise,
x  y  p/n  qty
—————-
1  x  x01  1
1  x  x02  2
1  x  x03  1
2  x  y04  1

Is there a simple way to combine lines with similar entries in (in the case above) the x, y columns, and have a cell with the part numbers (and quantities) (so the above table would become

1  x  x01, x02(2), x03  1

Sorry, wrong thread (obviously.)

btm said:

TRD around?
I’ve got a spreadsheet I need to import into Access; two fields need to be the primary keys in that, but in the spreadsheet they’re repeated, probably on four lines, but possibly more. I can combine them, but there are some part numbers on each of them that are different, and would need to be kept, together with the quantity (which is in a different column.)

To summarise,
x  y  p/n  qty
—————-
1  x  x01  1
1  x  x02  2
1  x  x03  1
2  x  y04  1

Is there a simple way to combine lines with similar entries in (in the case above) the x, y columns, and have a cell with the part numbers (and quantities) (so the above table would become

1  x  x01, x02(2), x03  1

I can’t think of a really simple way.

Possibilities include:
Create another column combining x and y, then use VLookup or Match on that, combined with Offset, to extract all the rows with matching x and y
It might be possible with a pivot table, don’t know.
It would be quite easy with some VBA, if you know VBA.
Import it into Access as it is, and play around with it there.

btm said:

Sorry, wrong thread (obviously.)

oops, me to.