<p>I'll use the <a href="https://tess.mit.edu/" rel="noreferrer">TESS</a> satellite as an example, which you might use to look at transiting exoplanets for example.</p>

<ol>
<li><p>Go to <a href="https://heasarc.gsfc.nasa.gov/docs/tess/data-access.html" rel="noreferrer">https://heasarc.gsfc.nasa.gov/docs/tess/data-access.html</a> this gives you a list of links to other useful TESS websites, data access and analysis tools. There are links here to get raw and processed light curves or even to get light curves for stars with known exoplanets. This page also explains what data are available.</p></li>
<li><p>What I want to do is look at some lightcurves. So you go to the <a href="https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html" rel="noreferrer">MAST portal</a>. First thing is to decide what target you want to find. There's a box at the top where you can type something in. Not every star in the sky will have data. There are limitations to the coverage and the types of stars for which data are acquired and you probably need to familiarise yourself with that if you are doing something systematic.</p></li>
<li><p>So I try HD 36705 (AB Dor, this is a star I know - about 6th magnitude in the constellation of Doradus. Up pops an image of the sky (on the right of the screen). HD 36705 is the bright star in the middle. In the centre panel you see a list of observations by whatever satellites are in the archive (not just TESS, but IUE, Kepler etc.) This star has lots of TESS observations listed. Each row is a dataset. You want the TESS lightcurves, which are some way down. You can identify them because they are labelled as "TESS", they have a little icon next to them which indicates you can view the data (see below), they are labelled with a target name of "149248196" and you want the ones which have an Observation-ID that ends in "-s".</p></li>
<li><p>These are lighcurves. You can quickly view them using the internal viewer, by clicking on the little lightcurve icon.
<a href="https://i.sstatic.net/YGEfK.png" rel="noreferrer"><img src="https://i.sstatic.net/YGEfK.png" alt="enter image description here"></a> The light curve viewer allows you have a basic look at the data, but you need to download it to do any analysis.</p></li>
<li><p>Click on the download icon <a href="https://i.sstatic.net/e5Pxs.png" rel="noreferrer"><img src="https://i.sstatic.net/e5Pxs.png" alt="enter image description here"></a> and put it on your own computer. This is a zip file. Unzip it. The good stuff is here:
inflating: MAST_2020-02-05T1007/TESS/tess2018292075959-s0004-0000000149248196-0124-s/tess2018292075959-s0004-0000000149248196-0124-s_lc.fits </p></li>
<li><p>This is the light curve in fits format. So you need a fits viewer to do anything with it or you need to import it into your own (python) code using something that reads fits files. To get started I would download a java program called <a href="http://www.star.bris.ac.uk/~mbt/topcat/" rel="noreferrer">topcat</a>. This is free and works on windows, linux or mac.</p></li>
<li><p>Load the light curve file into topcat. Plot "SAP_FLUX" against "TIME" and that is your basic lightcurve (see below). You can zoom in, manipulate the data, fold the data, subtract or add things to the data, lots of cool things. Plus make plots, anotate them, save them in various formats etc.</p></li>
</ol>

<p>It took me 15 mins to write this answer while downloading the data and doing those plots. You can do it!</p>

<p><a href="https://i.sstatic.net/dXtgn.png" rel="noreferrer"><img src="https://i.sstatic.net/dXtgn.png" alt="AB Dor, light curve 1"></a></p>

<p><a href="https://i.sstatic.net/4aFlq.png" rel="noreferrer"><img src="https://i.sstatic.net/4aFlq.png" alt="AB Dor, light curve 2"></a></p>

CC BY-SA 4.0
2020-02-06T01:22:19.570Z
You're answer is fabulous...Will try working today itself
Pranay
CC BY-SA 4.0
2020-02-05T15:19:20.120Z
2020-02-05T15:19:20.120Z
ProfRob
<p>As mentioned, I am a Grade-11 student. I have always been interested in Data Processing activities. This sums up my experience of working on Asteroid hunt Campaign under <strong><em>IASC</strong> <strong>(International Asteroid Search Campaign)</em></strong>. I yielded more than <strong><em>22</em></strong> Preliminary discoveries at once. Now I wish, to hunt for <strong>KBO (Kuiper belt objects)</strong> and <strong>Exoplanets</strong>. Definitely, hunting exoplanets is not a kids' task, but I possess the ability to learn and process and render astronomical data under guidance! I am ready to do everything. I am more inclined towards searching Outer-Worlds than the inner objects! Mentor-ship in this regard will be gratefully appreciated. I have searched quite a few things but none helped. I'm a Zooniverse user too. And over there, project slots were filled by other Citizen-Scientists!</p>

CC BY-SA 4.0
2020-02-04T19:27:35.073Z
Kepler and TESS data are all public domain.
ProfRob
CC BY-SA 4.0
2020-02-05T11:24:15.257Z
@Pranay I think the comment implies that the data is not only public, it is probably not hard to find. When asking "How do I do X?" questions it is always good to show at least some effort first, for several reasons. So why not do a quick internet search for something like "TESS data public access" or similar? The first few results will probably be what you are looking for. Also please add some information on your computer skills, what you can do with accessed data depends a lot on your coding or scripting skills. It's not going to be like https://www.zooniverse.org/
uhoh
CC BY-SA 4.0
2020-02-05T13:35:50.580Z
@uhoh I had tried working on Zooniverse but theere was an obstacle..And that was slots were full
Pranay
<exoplanet><data-analysis><planetary-transits><tess><trans-neptunian-object>
How can a Grade-11 Student avail TESS data and learn to process?
Pranay
# How can a Grade-11 Student avail TESS data and learn to process?

(Asked by: username_0 on 2020-02-04)

As mentioned, I am a Grade-11 student. I have always been interested in Data Processing activities. This sums up my experience of working on Asteroid hunt Campaign under ***IASC*** **(International Asteroid Search Campaign)**. I yielded more than ***22*** Preliminary discoveries at once. Now I wish, to hunt for **KBO (Kuiper belt objects)** and **Exoplanets**. Definitely, hunting exoplanets is not a kids' task, but I possess the ability to learn and process and render astronomical data under guidance! I am ready to do everything. I am more inclined towards searching Outer-Worlds than the inner objects! Mentor-ship in this regard will be gratefully appreciated. I have searched quite a few things but none helped. I'm a Zooniverse user too. And over there, project slots were filled by other Citizen-Scientists!

**Tags:** exoplanet, data-analysis, planetary-transits, tess, trans-neptunian-object

> **Comments:**
> **username_1**: Kepler and TESS data are all public domain.  
> **username_2**: @username_0 I think the comment implies that the data is not only public, it is probably not hard to find. When asking "How do I do X?" questions it is always good to show at least some effort first, for several reasons. So why not do a quick internet search for something like "TESS data public access" or similar? The first few results will probably be what you are looking for. Also please add some information on your computer skills, what you can do with accessed data depends a lot on your coding or scripting skills. It's not going to be like https://www.zooniverse.org/  
> **username_0**: @username_2 I had tried working on Zooniverse but theere was an obstacle..And that was slots were full  

---

## 1 answers

### Answer by username_1 on 2020-02-05. Score: 5

I'll use the [TESS](https://tess.mit.edu/) satellite as an example, which you might use to look at transiting exoplanets for example.

1. Go to <https://heasarc.gsfc.nasa.gov/docs/tess/data-access.html> this gives you a list of links to other useful TESS websites, data access and analysis tools. There are links here to get raw and processed light curves or even to get light curves for stars with known exoplanets. This page also explains what data are available.
2. What I want to do is look at some lightcurves. So you go to the [MAST portal](https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html). First thing is to decide what target you want to find. There's a box at the top where you can type something in. Not every star in the sky will have data. There are limitations to the coverage and the types of stars for which data are acquired and you probably need to familiarise yourself with that if you are doing something systematic.
3. So I try HD 36705 (AB Dor, this is a star I know - about 6th magnitude in the constellation of Doradus. Up pops an image of the sky (on the right of the screen). HD 36705 is the bright star in the middle. In the centre panel you see a list of observations by whatever satellites are in the archive (not just TESS, but IUE, Kepler etc.) This star has lots of TESS observations listed. Each row is a dataset. You want the TESS lightcurves, which are some way down. You can identify them because they are labelled as "TESS", they have a little icon next to them which indicates you can view the data (see below), they are labelled with a target name of "149248196" and you want the ones which have an Observation-ID that ends in "-s".
4. These are lighcurves. You can quickly view them using the internal viewer, by clicking on the little lightcurve icon.
   [![enter image description here](https://i.sstatic.net/YGEfK.png)](https://i.sstatic.net/YGEfK.png) The light curve viewer allows you have a basic look at the data, but you need to download it to do any analysis.
5. Click on the download icon [![enter image description here](https://i.sstatic.net/e5Pxs.png)](https://i.sstatic.net/e5Pxs.png) and put it on your own computer. This is a zip file. Unzip it. The good stuff is here:
   inflating: MAST\_2020-02-05T1007/TESS/tess2018292075959-s0004-0000000149248196-0124-s/tess2018292075959-s0004-0000000149248196-0124-s\_lc.fits
6. This is the light curve in fits format. So you need a fits viewer to do anything with it or you need to import it into your own (python) code using something that reads fits files. To get started I would download a java program called [topcat](http://www.star.bris.ac.uk/~mbt/topcat/). This is free and works on windows, linux or mac.
7. Load the light curve file into topcat. Plot "SAP\_FLUX" against "TIME" and that is your basic lightcurve (see below). You can zoom in, manipulate the data, fold the data, subtract or add things to the data, lots of cool things. Plus make plots, anotate them, save them in various formats etc.

It took me 15 mins to write this answer while downloading the data and doing those plots. You can do it!

[![AB Dor, light curve 1](https://i.sstatic.net/dXtgn.png)](https://i.sstatic.net/dXtgn.png)

[![AB Dor, light curve 2](https://i.sstatic.net/4aFlq.png)](https://i.sstatic.net/4aFlq.png)

> **Comments:**
> **username_0**: You're answer is fabulous...Will try working today itself  

---

