{
  "id": 71292,
  "title": "Where is the gap?",
  "url": "/competitions/PLAsTiCC-2018/discussion/71292",
  "author_name": "",
  "post_date": "2018-11-12T11:10:54.054193600Z",
  "votes": 8,
  "comment_count": 4,
  "views": 0,
  "content": "<p>We all noticed that there are wide time gaps in each light curve.  These gaps come from a physical constraint: the source must be visible during the night from the telescope location on earth.  I've performed a little analysis to better understand this, sharing it in case others find it useful: <a href=\"https://www.kaggle.com/cpmpml/where-is-the-gap?scriptVersionId=7304516#\">https://www.kaggle.com/cpmpml/where-is-the-gap?scriptVersionId=7304516#</a></p>\n\n<p><img src=\"https://storage.googleapis.com/kaggle-forum-message-attachments/419656/10658/__results___16_1.png\" alt=\"middle gap\"></p>",
  "messages": [
    {
      "id": "419656",
      "postDate": "11/12/2018 11:10:54",
      "content": "<p>We all noticed that there are wide time gaps in each light curve.  These gaps come from a physical constraint: the source must be visible during the night from the telescope location on earth.  I've performed a little analysis to better understand this, sharing it in case others find it useful: <a href=\"https://www.kaggle.com/cpmpml/where-is-the-gap?scriptVersionId=7304516#\">https://www.kaggle.com/cpmpml/where-is-the-gap?scriptVersionId=7304516#</a></p>\n\n<p><img src=\"https://storage.googleapis.com/kaggle-forum-message-attachments/419656/10658/__results___16_1.png\" alt=\"middle gap\"></p>",
      "rawMarkdown": "We all noticed that there are wide time gaps in each light curve.  These gaps come from a physical constraint: the source must be visible during the night from the telescope location on earth.  I've performed a little analysis to better understand this, sharing it in case others find it useful: https://www.kaggle.com/cpmpml/where-is-the-gap?scriptVersionId=7304516#\n\n![middle gap][1]\n\n\n  [1]: https://storage.googleapis.com/kaggle-forum-message-attachments/419656/10658/__results___16_1.png",
      "votes": null
    },
    {
      "id": "419847",
      "postDate": "11/12/2018 16:18:28",
      "content": "<p><a href=\"/cpmpml\">@cpmpml</a> does it mean that we just do not see some sky coordinates at the telescope location? (kind of a blind spot but for astronomy)</p>",
      "rawMarkdown": "cpmpml does it mean that we just do not see some sky coordinates at the telescope location? (kind of a blind spot but for astronomy)",
      "votes": null
    },
    {
      "id": "419868",
      "postDate": "11/12/2018 17:06:39",
      "content": "<p>I think that gap is our galactic disc...</p>\n\n<p>From the data_note pdf: \n\"All objects in the PLAsTiCC data are selected to have MWEBV &lt; 3, to ensure that we are not looking too close to the disc of the Milky Way, or similarly to ensure we are not looking through a large amount of dust\"</p>",
      "rawMarkdown": "I think that gap is our galactic disc...\n\nFrom the data_note pdf: \n\"All objects in the PLAsTiCC data are selected to have MWEBV &lt; 3, to ensure that we are not looking too close to the disc of the Milky Way, or similarly to ensure we are not looking through a large amount of dust\"",
      "votes": null
    },
    {
      "id": "419899",
      "postDate": "11/12/2018 18:31:24",
      "content": "<blockquote>\n  <p>I think that gap is our galactic disc…</p>\n</blockquote>\n\n<p>No it is not. It due to the relative position of the source, earth and sun.  Basically, earth has to be between the source and the sun so that the source is visible during the night.</p>",
      "rawMarkdown": "&gt; I think that gap is our galactic disc…\n\nNo it is not. It due to the relative position of the source, earth and sun.  Basically, earth has to be between the source and the sun so that the source is visible during the night.",
      "votes": null
    },
    {
      "id": "419900",
      "postDate": "11/12/2018 18:32:16",
      "content": "<p>Just look at the sky from your own location: you only see some of it during the night.  The rest is hidden by the earth.</p>",
      "rawMarkdown": "Just look at the sky from your own location: you only see some of it during the night.  The rest is hidden by the earth.",
      "votes": null
    }
  ],
  "comments": [
    {
      "id": 419847,
      "author_name": "blondinka",
      "author_url": "",
      "post_date": "11/12/2018 16:18:28",
      "content": "<p><a href=\"/cpmpml\">@cpmpml</a> does it mean that we just do not see some sky coordinates at the telescope location? (kind of a blind spot but for astronomy)</p>",
      "votes": null,
      "replies": [
        {
          "id": 419900,
          "author_name": "cpmpml",
          "author_url": "",
          "post_date": "11/12/2018 18:32:16",
          "content": "<p>Just look at the sky from your own location: you only see some of it during the night.  The rest is hidden by the earth.</p>",
          "votes": null,
          "replies": []
        }
      ]
    },
    {
      "id": 419868,
      "author_name": "mcsnappy",
      "author_url": "",
      "post_date": "11/12/2018 17:06:39",
      "content": "<p>I think that gap is our galactic disc...</p>\n\n<p>From the data_note pdf: \n\"All objects in the PLAsTiCC data are selected to have MWEBV &lt; 3, to ensure that we are not looking too close to the disc of the Milky Way, or similarly to ensure we are not looking through a large amount of dust\"</p>",
      "votes": null,
      "replies": [
        {
          "id": 419899,
          "author_name": "cpmpml",
          "author_url": "",
          "post_date": "11/12/2018 18:31:24",
          "content": "<blockquote>\n  <p>I think that gap is our galactic disc…</p>\n</blockquote>\n\n<p>No it is not. It due to the relative position of the source, earth and sun.  Basically, earth has to be between the source and the sun so that the source is visible during the night.</p>",
          "votes": null,
          "replies": []
        }
      ]
    }
  ],
  "raw_markdown_by_id": {
    "419656": "We all noticed that there are wide time gaps in each light curve.  These gaps come from a physical constraint: the source must be visible during the night from the telescope location on earth.  I've performed a little analysis to better understand this, sharing it in case others find it useful: https://www.kaggle.com/cpmpml/where-is-the-gap?scriptVersionId=7304516#\n\n![middle gap][1]\n\n\n  [1]: https://storage.googleapis.com/kaggle-forum-message-attachments/419656/10658/__results___16_1.png",
    "419847": "cpmpml does it mean that we just do not see some sky coordinates at the telescope location? (kind of a blind spot but for astronomy)",
    "419868": "I think that gap is our galactic disc...\n\nFrom the data_note pdf: \n\"All objects in the PLAsTiCC data are selected to have MWEBV &lt; 3, to ensure that we are not looking too close to the disc of the Milky Way, or similarly to ensure we are not looking through a large amount of dust\"",
    "419899": "&gt; I think that gap is our galactic disc…\n\nNo it is not. It due to the relative position of the source, earth and sun.  Basically, earth has to be between the source and the sun so that the source is visible during the night.",
    "419900": "Just look at the sky from your own location: you only see some of it during the night.  The rest is hidden by the earth."
  },
  "source": "meta"
}