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From: Jukka Nevalainen <Jukka.H.Nevalainen@helsinki.fi>
Subject: XMM orbit tool
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Date: Fri, 30 Nov 2012 15:11:04 +0200
From: Jukka Nevalainen <Jukka.H.Nevalainen@helsinki.fi>
To: Matthias Ehle <xmmhelp@sciops.esa.int>
Subject: XMM orbit tool
Hello,

I wonder if there is a user-friendly tool to calculate the position of 
XMM in the sky at a given instant? We would need this info for a 
planning of a new mission.

The document called XMM-SOC-ICD-0019-OAD discusses about fortran 
programs to use with the orbit data provided together with the science 
data. I was hoping that there would be a more used-fiendly tool, as 
http://xmm2.esac.esa.int/external/xmm_science/sat_pos/index.shtml
but with an option to input the times of a particular observation,
and detailed information on the output coordinate system.

Jukka Nevalainen


Reply 1

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From: Matthias Ehle <xmmhelp@sciops.esa.int>
To: Jukka.H.Nevalainen@helsinki.fi
Subject: Re: XMM orbit tool (PR#51381)
Date: Fri Nov 30 13:19:45 2012
Hi Jukka,

thanks for contacting us - can you, please, have a look at the SAS task "orbit",

see http://xmm.esac.esa.int/sas/current/doc/orbit/orbit.html

I have the impression (and hope) that this tool allows you to derive
the information about the XMM-Newton orbit that you need.

Regards,
   Matthias

--
   Dr Matthias Ehle 
   XMM-Newton Science Operations Centre
   Community Support and Scientific Planning Team


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Date: Mon, 03 Dec 2012 09:34:46 +0200
From: Jukka Nevalainen <Jukka.H.Nevalainen@helsinki.fi>
To: Matthias Ehle <xmmhelp@sciops.esa.int>
Subject: Re: XMM orbit tool (PR#51381)
Thanks, this worked!

I would like you to confirm that I got the units right:

Coordinates: x,y,z in km in this coordinate system:
Inertial Mean Geocentric Equatorial System of year
J2000.0, with the x-axis towards the mean vernal equinox, the x-y plane 
coinciding with the mean equatorial plane and the z-axis toward north.

Time:
The orbit - tool page reports:
Note: The only param TIME format supported currently is
the ``seconds since XMM reference time'' mode.

I guess this means the Terrestrial Time? At least the time values in the 
file produced by the orbit tool are consistent with those of the science 
data of the same observation.

Jukka



On 30/11/12 15:19, Matthias Ehle wrote:
> Hi Jukka,
>
> thanks for contacting us - can you, please, have a look at the SAS task
"orbit",
>
> see http://xmm.esac.esa.int/sas/current/doc/orbit/orbit.html
>
> I have the impression (and hope) that this tool allows you to derive
> the information about the XMM-Newton orbit that you need.
>
> Regards,
>     Matthias
>
> --
>     Dr Matthias Ehle
>     XMM-Newton Science Operations Centre
>     Community Support and Scientific Planning Team
>
> This message and any attachments are intended for the use of the addressee
or addressees only. The unauthorised disclosure, use, dissemination or copying
(either in whole or in part) of its content is not permitted. If you received
this message in error, please notify the sender and delete it from your system.
Emails can be altered and their integrity cannot be guaranteed by the sender.
>
> Please consider the environment before printing this email.
>



Reply 2

Resend
From: Matthias Ehle <xmmhelp@sciops.esa.int>
To: Jukka.H.Nevalainen@helsinki.fi
Subject: Re: XMM orbit tool (PR#51381)
Date: Mon Dec  3 09:27:58 2012
> Thanks, this worked!
> 
> I would like you to confirm that I got the units right:
> 
> Coordinates: x,y,z in km in this coordinate system:
> Inertial Mean Geocentric Equatorial System of year
> J2000.0, with the x-axis towards the mean vernal equinox, the x-y plane 
> coinciding with the mean equatorial plane and the z-axis toward north.
> 
> Time:
> The orbit - tool page reports:
> Note: The only param TIME format supported currently is
> the ``seconds since XMM reference time'' mode.
> 
> I guess this means the Terrestrial Time? At least the time values in the 
> file produced by the orbit tool are consistent with those of the science 
> data of the same observation.
> 

Hello Jukka,

From the orbit on-line documentation:
TIME in seconds since TSTART, x-y-z position vectors in km, and x-y-z velocity
vectors in km/s. 

I also cross-checked the reference [3] in the orbit documentation and, yes, 
on page 10 I see the definition of the x-y-z system that you give, too. 
So this should be OK. 

About times:
TSTART is listed as a header keyword in the orbit generated output file, e.g.
TSTART  = 1.41634404184000E+08 / [s] Start of orbit interval

For the definition of the time system used for XMM-Newton, please see
http://xmm.esac.esa.int/external/xmm_user_support/documentation/dfhb/node55.html
Yes, times are in Terrestrial Time.

Regards,
   Matthias 



Followup 2

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Date: Tue, 04 Dec 2012 07:38:26 +0200
From: Jukka Nevalainen <Jukka.H.Nevalainen@helsinki.fi>
To: Matthias Ehle <xmmhelp@sciops.esa.int>
Subject: Re: XMM orbit tool (PR#51381)
Thanks.

Jukka


On 03/12/12 11:27, Matthias Ehle wrote:
>> Thanks, this worked!
>>
>> I would like you to confirm that I got the units right:
>>
>> Coordinates: x,y,z in km in this coordinate system:
>> Inertial Mean Geocentric Equatorial System of year
>> J2000.0, with the x-axis towards the mean vernal equinox, the x-y plane
>> coinciding with the mean equatorial plane and the z-axis toward north.
>>
>> Time:
>> The orbit - tool page reports:
>> Note: The only param TIME format supported currently is
>> the ``seconds since XMM reference time'' mode.
>>
>> I guess this means the Terrestrial Time? At least the time values in
the
>> file produced by the orbit tool are consistent with those of the
science
>> data of the same observation.
>>
>
> Hello Jukka,
>
>  From the orbit on-line documentation:
> TIME in seconds since TSTART, x-y-z position vectors in km, and x-y-z
velocity
> vectors in km/s.
>
> I also cross-checked the reference [3] in the orbit documentation and, yes,
> on page 10 I see the definition of the x-y-z system that you give, too.
> So this should be OK.
>
> About times:
> TSTART is listed as a header keyword in the orbit generated output file,
e.g.
> TSTART  = 1.41634404184000E+08 / [s] Start of orbit interval
>
> For the definition of the time system used for XMM-Newton, please see
> http://xmm.esac.esa.int/external/xmm_user_support/documentation/dfhb/node55.html
> Yes, times are in Terrestrial Time.
>
> Regards,
>     Matthias
>
>
>
> This message and any attachments are intended for the use of the addressee
or addressees only. The unauthorised disclosure, use, dissemination or copying
(either in whole or in part) of its content is not permitted. If you received
this message in error, please notify the sender and delete it from your system.
Emails can be altered and their integrity cannot be guaranteed by the sender.
>
> Please consider the environment before printing this email.
>


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