MS
Mark Sims
Sat, Jul 9, 2016 6:58 AM
To appease our new (hopefully) benevolent Martian overlords, Lady Heather can now work in Mars time... and I have it running right now while connected to a Jupiter timing receiver.
Hmm. I have a SC-01.. One could hook it up to a Arduino trivially.
And run it on Mars time..
To appease our new (hopefully) benevolent Martian overlords, Lady Heather can now work in Mars time... and I have it running right now while connected to a Jupiter timing receiver.
---------------------
> Hmm. I have a SC-01.. One could hook it up to a Arduino trivially.
And run it on Mars time..
J
jimlux
Sat, Jul 9, 2016 2:37 PM
On 7/8/16 11:58 PM, Mark Sims wrote:
To appease our new (hopefully) benevolent Martian overlords, Lady Heather can now work in Mars time... and I have it running right now while connected to a Jupiter timing receiver.
Now that Juno is getting ready to peer beneath Jupiter's clouds
(there's a really great poster, probably a one-off, with an image of
Jupiter and a zipper), maybe we should be worrying about our Jovian
overlords.
Juno doesn't carry a USO, but it does have coherent turnaround
transponders for X and Ka band which have pretty good Allan Deviation
performance: less than 1E-15 added deviation over 1000 seconds.
Hmm. I have a SC-01.. One could hook it up to a Arduino trivially.
On 7/8/16 11:58 PM, Mark Sims wrote:
> To appease our new (hopefully) benevolent Martian overlords, Lady Heather can now work in Mars time... and I have it running right now while connected to a Jupiter timing receiver.
>
Now that Juno is getting ready to peer beneath Jupiter's clouds
(there's a really great poster, probably a one-off, with an image of
Jupiter and a zipper), maybe we should be worrying about our Jovian
overlords.
Juno doesn't carry a USO, but it does have coherent turnaround
transponders for X and Ka band which have pretty good Allan Deviation
performance: less than 1E-15 added deviation over 1000 seconds.
> ---------------------
>> Hmm. I have a SC-01.. One could hook it up to a Arduino trivially.
> And run it on Mars time..
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>
SM
Scott McGrath
Sat, Jul 9, 2016 3:33 PM
The Venusian's are feeling left out ....
Content by Scott
Typos by Siri
On Jul 9, 2016, at 2:58 AM, Mark Sims holrum@hotmail.com wrote:
To appease our new (hopefully) benevolent Martian overlords, Lady Heather can now work in Mars time... and I have it running right now while connected to a Jupiter timing receiver.
Hmm. I have a SC-01.. One could hook it up to a Arduino trivially.
The Venusian's are feeling left out ....
Content by Scott
Typos by Siri
> On Jul 9, 2016, at 2:58 AM, Mark Sims <holrum@hotmail.com> wrote:
>
> To appease our new (hopefully) benevolent Martian overlords, Lady Heather can now work in Mars time... and I have it running right now while connected to a Jupiter timing receiver.
>
> ---------------------
>> Hmm. I have a SC-01.. One could hook it up to a Arduino trivially.
> And run it on Mars time..
> _______________________________________________
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
MC
Mike Cook
Sat, Jul 9, 2016 4:42 PM
Le 9 juil. 2016 à 17:33, Scott McGrath scmcgrath@gmail.com a écrit :
The Venusian's are feeling left out ….
I guess it is possible as there is an agreed prime meridian even though we cannot see the central peak in the crater Ariadne in the visible spectrum.
Content by Scott
Typos by Siri
On Jul 9, 2016, at 2:58 AM, Mark Sims holrum@hotmail.com wrote:
To appease our new (hopefully) benevolent Martian overlords, Lady Heather can now work in Mars time... and I have it running right now while connected to a Jupiter timing receiver.
Hmm. I have a SC-01.. One could hook it up to a Arduino trivially.
"The power of accurate observation is commonly called cynicism by those who have not got it. »
George Bernard Shaw
> Le 9 juil. 2016 à 17:33, Scott McGrath <scmcgrath@gmail.com> a écrit :
>
> The Venusian's are feeling left out ….
I guess it is possible as there is an agreed prime meridian even though we cannot see the central peak in the crater Ariadne in the visible spectrum.
>
> Content by Scott
> Typos by Siri
>
>> On Jul 9, 2016, at 2:58 AM, Mark Sims <holrum@hotmail.com> wrote:
>>
>> To appease our new (hopefully) benevolent Martian overlords, Lady Heather can now work in Mars time... and I have it running right now while connected to a Jupiter timing receiver.
>>
>> ---------------------
>>> Hmm. I have a SC-01.. One could hook it up to a Arduino trivially.
>> And run it on Mars time..
>> _______________________________________________
>> time-nuts mailing list -- time-nuts@febo.com
>> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
> _______________________________________________
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
"The power of accurate observation is commonly called cynicism by those who have not got it. »
George Bernard Shaw
JF
Joe Fitzgerald
Sat, Jul 9, 2016 5:24 PM
What organization is in charge of inserting leap seconds into the
Martian time scale?
-Joe Fitzgerald KM1P
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What organization is in charge of inserting leap seconds into the
Martian time scale?
-Joe Fitzgerald KM1P
---
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RW
Richard W. Solomon
Sat, Jul 9, 2016 6:44 PM
United Federation of Planets.
Dick, W1KSZ
-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces@febo.com] On Behalf Of Joe Fitzgerald
Sent: Saturday, July 09, 2016 10:24 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] GPS disciplined Mars clock
What organization is in charge of inserting leap seconds into the Martian time scale?
-Joe Fitzgerald KM1P
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United Federation of Planets.
Dick, W1KSZ
-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces@febo.com] On Behalf Of Joe Fitzgerald
Sent: Saturday, July 09, 2016 10:24 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] GPS disciplined Mars clock
What organization is in charge of inserting leap seconds into the Martian time scale?
-Joe Fitzgerald KM1P
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jimlux
Sat, Jul 9, 2016 7:00 PM
On 7/9/16 10:24 AM, Joe Fitzgerald wrote:
What organization is in charge of inserting leap seconds into the
Martian time scale?
Inasmuch as there's no business concerns about noon being local solar
noon, probably nobody..
TAI my friend, TAI...
On 7/9/16 10:24 AM, Joe Fitzgerald wrote:
>
> What organization is in charge of inserting leap seconds into the
> Martian time scale?
>
Inasmuch as there's no business concerns about noon being local solar
noon, probably nobody..
TAI my friend, TAI...
MB
Martin Burnicki
Sat, Jul 9, 2016 7:00 PM
What organization is in charge of inserting leap seconds into the
Martian time scale?
IMRS - International Mars Rotation Service ;-)
Joe Fitzgerald schrieb:
>
> What organization is in charge of inserting leap seconds into the
> Martian time scale?
IMRS - International Mars Rotation Service ;-)
JF
Joe Fitzgerald
Sat, Jul 9, 2016 8:40 PM
On 7/9/2016 3:00 PM, jimlux wrote:
Hmm, gravitational time dilation it might complicate things ... I
suppose it depends on whether your Mars clock is on the surface of Mars,
Earth or somewhere else.
On 7/9/2016 3:34 PM, Hal Murray wrote:
How good is the data on the rotation rate for Mars? Is it good enough so
that they would need leap seconds?
Without an ocean or significant atmosphere I bet the rotation rate would
be more predictable than Earth - once good measurements were made. The
dearth of observatories on Mars suggests the current error bars on
current rate estimates pretty wide.
Fun to think about that's for sure.
-Joe
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On 7/9/2016 3:00 PM, jimlux wrote:
>
> TAI my friend, TAI...
>
Hmm, gravitational time dilation it might complicate things ... I
suppose it depends on whether your Mars clock is on the surface of Mars,
Earth or somewhere else.
On 7/9/2016 3:34 PM, Hal Murray wrote:
>
> How good is the data on the rotation rate for Mars? Is it good enough so
> that they would need leap seconds?
>
>
Without an ocean or significant atmosphere I bet the rotation rate would
be more predictable than Earth - once good measurements were made. The
dearth of observatories on Mars suggests the current error bars on
current rate estimates pretty wide.
Fun to think about that's for sure.
-Joe
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jimlux
Sat, Jul 9, 2016 9:59 PM
On 7/9/16 1:40 PM, Joe Fitzgerald wrote:
On 7/9/2016 3:00 PM, jimlux wrote:
Hmm, gravitational time dilation it might complicate things ... I
suppose it depends on whether your Mars clock is on the surface of Mars,
Earth or somewhere else.
On 7/9/2016 3:34 PM, Hal Murray wrote:
How good is the data on the rotation rate for Mars? Is it good enough so
that they would need leap seconds?
Without an ocean or significant atmosphere I bet the rotation rate would
be more predictable than Earth - once good measurements were made. The
dearth of observatories on Mars suggests the current error bars on
current rate estimates pretty wide.
I'd guess the rate estimate is quite good. Wikipedia says
88,775.24409 seconds/sol
We can do very good ranging to MER and MSL. Phoenix didn't carry a
direct to earth transponder.
We can also do ranging from rovers to MRO, and then from MRO to Earth.
I don't know how much ranging we've done at UHF, though. The radio
wasn't really designed for it, so the math gets a bit complex, and I'm
not sure you can back out all the higher order terms. The UHF radio on
MRO does have a USO driving it, so it's timing performance should be
quite good in "open loop record" mode.
The uncertainty in the MRO range & range rate is probably less than for
the rovers, because the SNR is much better (big multi-meter antenna on
MRO helps a lot).
On 7/9/16 1:40 PM, Joe Fitzgerald wrote:
>
>
> On 7/9/2016 3:00 PM, jimlux wrote:
>>
>> TAI my friend, TAI...
>>
> Hmm, gravitational time dilation it might complicate things ... I
> suppose it depends on whether your Mars clock is on the surface of Mars,
> Earth or somewhere else.
>
>
> On 7/9/2016 3:34 PM, Hal Murray wrote:
>>
>> How good is the data on the rotation rate for Mars? Is it good enough so
>> that they would need leap seconds?
>>
>>
>
> Without an ocean or significant atmosphere I bet the rotation rate would
> be more predictable than Earth - once good measurements were made. The
> dearth of observatories on Mars suggests the current error bars on
> current rate estimates pretty wide.
I'd guess the rate estimate is quite good. Wikipedia says
88,775.24409 seconds/sol
We can do very good ranging to MER and MSL. Phoenix didn't carry a
direct to earth transponder.
We can also do ranging from rovers to MRO, and then from MRO to Earth.
I don't know how much ranging we've done at UHF, though. The radio
wasn't really designed for it, so the math gets a bit complex, and I'm
not sure you can back out all the higher order terms. The UHF radio on
MRO does have a USO driving it, so it's timing performance should be
quite good in "open loop record" mode.
The uncertainty in the MRO range & range rate is probably less than for
the rovers, because the SNR is much better (big multi-meter antenna on
MRO helps a lot).
>
> Fun to think about that's for sure.
>
> -Joe
>
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