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   "source": [
    "# Target Pixel Files\n",
    "\n",
    "The `lightkurve` documention has *awesome* resources for playing with Target Pixel Files (TPFs) from Kepler or TESS. Go look [there](http://docs.lightkurve.org)! However, we added a few small wrappers to make it very slightly easier to download a simple Target Pixel File for either Kepler, K2, or TESS. Here's the scoop:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "import henrietta as hsl"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Downloading TPFs"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "For Kepler, you'll need to specify a Kepler quarter, a period of roughly 90 days. Remember that the pixels rotate on the sky 4 times a year, so you can't seamlessly stitch together multiple TPFs."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "tpf_kepler = hsl.download_kepler_tpf('Kepler-7', quarter=2)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "For K2, you can include a star name or an EPIC ID number (which can often be found on the NASA Exoplanet Archive)."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "tpf_k2 = hsl.download_k2_tpf(206103150)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "For TESS, only a *tiny* fraction of the data is available right now, all located at [MAST](https://archive.stsci.edu/prepds/tess-data-alerts/). Still, here's a wrapper to download a star, based on its TESS Input Catalog (TIC) identification number."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "tpf_tess = hsl.download_tess_tpf(25155310)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Simple TPF Procedures"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "This is just a tiny sample of things you can do with a TPF. Again, you should go read the `lightkurve` [documentation and tutorials](http://docs.lightkurve.org) for TPFs! You can make an imshow plot of a single frame, where you specify which image you want in the movie via the `frame` keyword."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "tpf_k2.plot(frame=0)\n",
    "tpf_k2.plot(frame=100);"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "You can make a light curve from the TPF."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "lc =tpf_k2.to_lightcurve(aperture_mask='all')\n",
    "lc.scatter();"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "You can access the times and the array of fluxes directly."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "time = tpf_k2.time\n",
    "movie = tpf_k2.flux\n",
    "print('This TPF has {} times and an array of pixels with shape {}.'.format(len(time), movie.shape))"
   ]
  }
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