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<title>Munipack โ Time Series Table Format</title>
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<a class="headtitle" href="munipack.html">Munipack</a>
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<section>
<h1 class="noindent">Time Series Table Format</h1>
<p class="abstract">
Description of FITS tables intended for store of time series
(light curves) or another time series data.
</p>
<p>
The table is created as output of <samp>munipack timeseries</samp> command.
</p>
<p>
The specification slightly follows <a href="http://dotastro.org/simpletimeseries/">SimpleTimeseries</a> format (IMPORTANT: This link is intentionally dead due authors themselves.
There is no widely accepted definition
of a format for light curves and related affairs yet.) Generally, Munipack's format is a bit more simplified and
restrictive.
</p>
<h1>File Structure</h1>
<div class="table">
<table>
<caption>FITS file structure</caption>
<tr><th>HDU</th><th>EXTNAME</th><th>Description</th></tr>
<tr><td>0</td><td></td><td>Dummy<sup><a href="#dummy">[โ ]</a></sup></td></tr>
<tr><td>1</td><td>TIMESERIES</td><td>Time Series Table</td></tr>
<tr><td>2</td><td>CATALOGUE</td><td>Objects identification (coordinates)</td></tr>
</table>
</div>
<div class="notes">
<p id="dummy">
<sup><a href="#dummy">[โ ]</a></sup>
The first dummy extension contains keywords of identification HDUNAME,
which is set mandatory to 'TIMESERIES', CREATURE is set to
'Munipack X.Y.Z' version and a link to this page as a comment.
</p>
</div>
<h1 id="tmtable">Time Series Table</h1>
<p>
The main table which stores the time series.
</p>
<div class="table">
<table>
<caption>Time Series Keywords</caption>
<tr><th>Keyword</th><th>Value</th><th>Default</th><th>Description</th></tr>
<tr><td>EXTNAME</td><td>TIMESERIES</td><td>TIMESERIES</td><td>extension identifier</td></tr>
<tr><td>TIMETYPE</td><td>JD</td><td>JD</td><td>Type of TIME: JD (Julian Day),
MJD (modified JD), HJD (heliocentric JD), phase <i>ฯ</i><sup><a href="#ttype">[1]</a></sup></td></tr>
<tr><td>TIMESYS</td><td>UTC</td><td>UTC</td><td>Time system</td></tr>
<tr><td>TIMEREF</td><td>GEOCENTRIC</td><td></td><td>Reference time point</td></tr>
<tr><td>TIMESTMP</td><td>MIDPOINT</td><td>MIDPOINT</td><td>time stamp = MIDPOINT,BEGIN,END<sup><a href="#tstamp">[2]</a></sup></td></tr>
<!--
<tr><td>TIMEERR</td><td></td><td></td><td>Uncertainty in the time measurement<sup><a href="#terr">[3]</a></sup></td></tr>
<tr><td>TIMERES</td><td></td><td></td><td>Resolution in the time measurement<sup><a href="#terr">[3]</a></sup></td></tr>
<tr><td>FILTER</td><td></td><td></td><td>Filter, spectral band-pass<sup><a href="#fsys">[4]</a></sup></td></tr>
<tr><td>PHOTSYS</td><td></td><td></td><td>Photometry system<sup><a href="#fsys">[4]</a></sup></td></tr>
-->
</table>
</div>
<div class="notes">
<p id="ttype">
<sup><a href="#ttype">[1]</a></sup>
Definition of Julian (also other derived) days provides <a href="https://en.wikipedia.org/wiki/Julian_day">Julian day</a> wiki page. The phase <i>ฯ = {(t - t<sub>0</sub>)/P}</i> is
defined as <a href="https://en.wikipedia.org/wiki/Floor_and_ceiling_functions">fractional
part</a> (<i>{x} = x - โxโ</i>) of time difference HJD since the epoch <i>t<sub>0</sub></i>
per period <i>P</i>.
</p>
<p id="tstamp">
<sup><a href="#tstamp">[2]</a></sup>
The time is labeled by timestamps (the elapsed time is <i>T</i>):
at the begin <i>t<sub>0</sub></i> (BEGIN) up to finish <i>t<sub>1</sub> =
t<sub>0</sub> + T</i> (END) time. The midpoint
is computed as <i>t<sub>0</sub> + T/2</i>.
</p>
<!--
<p id="terr">
<sup><a href="#terr">[3]</a></sup>
The keyword is optional. It is presented, if the value has been provided
by user.
</p>
<p id="fsys">
<sup><a href="#fsys">[4]</a></sup>
Values are common spectral pass-band for all frames derived from FILTER
and PHOTSYS keywords (for calibrated data).
</p>
-->
</div>
<div class="table">
<table>
<caption>Time Series Table</caption>
<tr><th>Column</th><th>Type</th><th>Description</th></tr>
<tr><td>TIME</td><td>1D</td><td>Time-like quantity<sup><a href="#tt">[a]</a></sup></td></tr>
<tr><td>EXPTIME</td><td>1D</td><td>Integration time like quantity<sup><a href="#te">[b]</a></sup></td></tr>
<tr><td>Q<sub><i>i</i></sub></td><td>1D</td><td>Quantity for <i>i</i>-th object<sup><a href="#qt">[c]</a></sup></td></tr>
<tr><td>QE<sub><i>i</i></sub></td><td>1D</td><td>Standard deviation of Q-<i>i</i><sup><a href="#qt">[c]</a></sup></td></tr>
</table>
</div>
<div class="notes">
<p id="tt">
<sup><a href="#tt">[a]</a></sup>
Units of the time-like quantity in days (for H,M,JD). The phase has no units.
</p>
<p id="te">
<sup><a href="#te">[b]</a></sup>
The exposure time is directly copied from frames and units are (perhaps)
seconds.
</p>
<p id="qt">
<sup><a href="#qt">[c]</a></sup>
Table can contain many physical quantities. For their meaning, see
<a href="dataform_photometry.html">Photometry data table</a>. The table
can contains multiple columns of the quantities for all required objects.
</p>
</div>
<h1>Object Catalogue Table</h1>
<p>
This extension contains equatorial coordinates of objects of TIMESERIES extension.
</p>
<div class="table">
<table>
<caption>Object Catalogue Keywords</caption>
<tr><th>Keyword</th><th>Value</th><th>Default</th><th>Description</th></tr>
<tr><td>EXTNAME</td><td>CATALOGUE</td><td>CATALOGUE</td><td>extension identifier</td></tr>
<tr><td>REFRAME</td><td></td><td>ICRS</td><td>Reference celestial coordinate system</td></tr>
<tr><td>EPOCH</td><td></td><td>2000</td><td>Reference epoch for proper motion</td></tr>
</table>
</div>
<div class="table">
<table>
<caption>Object catalogue Table</caption>
<tr><th>Column</th><th>Type</th><th>Description</th><th>Units</th></tr>
<tr><td>RAJ2000</td><td>1D</td><td>Right Ascension<sup><a href="#ep">[ยง]</a></sup></td><td>degrees</td></tr>
<tr><td>DEJ2000</td><td>1D</td><td>Declination<sup><a href="#ep">[ยง]</a></sup></td><td>degrees</td></tr>
</table>
</div>
<div class="notes">
<p id="ep">
<sup><a href="#ep">[ยง]</a></sup>
Coordinates are referenced for epoch of the observation.
Fast-moving objects can evince visible coordinate differences.
</p>
</div>
<h2>See Also</h2>
<p>
<a href="man_timeseries.html">Time Series</a>
</p>
</section>
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ยฉ 1997 โ 2025
<a href="https://integral.physics.muni.cz/" title="author's homepage"
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