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SkySat
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<h2 id="overview">Overview</h2> <p>The resolution of the SkySat satellite imagery and videos is high enough to observe objects that impact the global economy such as terrain, cars and shipping containers. The satellites can capture video clips lasting up to 90 seconds at 30 frames per second.<a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a> The high-definition satellite video from SkySat satellites "could help us understand our world better by analyzing movement of goods and people, providing visual data about supply chains, shipping, industrial plant activity, and even humanitarian relief efforts".<a class="footnote-ref" id="fnref:6" href="#fn:6"><sup>6</sup></a> </p><p>The constellation's goal is to be able to provide high-resolution satellite imagery of any place on Earth multiple times a day.<a class="footnote-ref" id="fnref:7" href="#fn:7"><sup>7</sup></a> When Skybox originally developed the satellites, they planned to "change the nature" of the satellite industry by building satellites with "off-the-shelf" electronics that cost under US$50 million.<a class="footnote-ref" id="fnref:8" href="#fn:8"><sup>8</sup></a> </p> <h2 id="history">History</h2> <p>By April 2012, Skybox Imaging had raised a total of $91 million (equivalent to about $125M in 2024) of <a href="/facts/Private_capital/lLkzDdoB">private capital</a> from <a href="/facts/Khosla_Ventures/dp008vbo">Khosla Ventures</a>, <a href="/facts/Bessemer_Venture_Partners/P28h0gQI">Bessemer Venture Partners</a>, <a href="/facts/Canaan_Partners/JBbm2Phw">Canaan Partners</a> and <a href="/facts/Norwest_Venture_Partners/bMSwn1jC">Norwest Venture Partners</a> to develop the SkySat constellation.<a class="footnote-ref" id="fnref:9" href="#fn:9"><sup>9</sup></a> </p><p>On 21 November 2013, the first satellite, SkySat-1, was launched on a <a href="/facts/Dnepr_rocket/g3VIdEfT">Dnepr rocket</a> from <a href="/facts/Dombarovsky_Air_Base/Lonyn6ke">Dombarovsky Air Base, Russia</a>.<a class="footnote-ref" id="fnref:10" href="#fn:10"><sup>10</sup></a> Less than a month later, on 11 December 2013, the first images captured by the SkySat-1 satellite, of <a href="/facts/Perth/63YUr99S">Perth</a>, <a href="/facts/Abu_Dhabi/0fXh0jQ2">Abu Dhabi</a>, and the coast of <a href="/facts/Somalia/3wQYwIdS">Somalia</a>, were released.<a class="footnote-ref" id="fnref:11" href="#fn:11"><sup>11</sup></a> The second satellite, SkySat-2, launched on a <a href="/facts/Soyuz-2/U3nHlUKx">Soyuz-2</a>/Fregat rocket from <a href="/facts/Baikonur_Cosmodrome/sk16LwcH">Baikonur</a>, <a href="/facts/Kazakhstan/Vfs8NI6e">Kazakhstan</a> on 8 July 2014.<a class="footnote-ref" id="fnref:12" href="#fn:12"><sup>12</sup></a> The company plans to eventually launch a fleet of 24 satellites.<a class="footnote-ref" id="fnref:13" href="#fn:13"><sup>13</sup></a> and released its first images within 48 hours of launch.<a class="footnote-ref" id="fnref:14" href="#fn:14"><sup>14</sup></a> </p><p>On 10 February 2014, <a href="/facts/SSL_(company)/HUcaqLl2">SSL</a> announced that Skybox had awarded it a contract to build 13 more satellites based on a revised "SkySat C" design.<a class="footnote-ref" id="fnref:15" href="#fn:15"><sup>15</sup></a><a class="footnote-ref" id="fnref:16" href="#fn:16"><sup>16</sup></a> The first of these, Skysat-3, also referred to as SkySat-C1, was launched on 22 June 2016 by <a href="/facts/Indian_Space_Research_Organisation/CdAoFQTL">Indian Space Research Organisation</a> (ISRO) on <a href="/facts/Polar_Satellite_Launch_Vehicle/KantsJM7">Polar Satellite Launch Vehicle</a> <a href="/facts/PSLV-C34/1KC1t23c">PSLV-C34</a>.<a class="footnote-ref" id="fnref:17" href="#fn:17"><sup>17</sup></a><a class="footnote-ref" id="fnref:18" href="#fn:18"><sup>18</sup></a> </p><p>On 10 June 2014, Skybox Imaging announced that it had entered into an agreement to be acquired by <a href="/facts/Google/GT9Sugza">Google</a> for $500 million (equivalent to about $664M in 2024).<a class="footnote-ref" id="fnref:19" href="#fn:19"><sup>19</sup></a><a class="footnote-ref" id="fnref:20" href="#fn:20"><sup>20</sup></a> The acquisition was completed on 1 August 2014.<a class="footnote-ref" id="fnref:21" href="#fn:21"><sup>21</sup></a><a class="footnote-ref" id="fnref:22" href="#fn:22"><sup>22</sup></a> Skybox Imaging changed its name to "Terra Bella" on 8 March 2016, to indicate its focus on image analytics.<a class="footnote-ref" id="fnref:23" href="#fn:23"><sup>23</sup></a> The new name was partially based on the Terra Bella Avenue in <a href="/facts/Mountain_View%2c_California/dm29hKlV">Mountain View, California</a>, where the company's headquarters are located.<a class="footnote-ref" id="fnref:24" href="#fn:24"><sup>24</sup></a> Terra bella is Italian for "beautiful Earth". The name change was also partially due to perceived trademark infringement that came to light in the Google acquisition. </p><p>Four more SkySat units were launched on 16 September 2016, by the <a href="/facts/Vega_rocket/AuH9mJ32">Vega rocket</a>'s seventh flight from <a href="/facts/Guiana_Space_Centre/hp6TSJ6W">Kourou</a>.<a class="footnote-ref" id="fnref:25" href="#fn:25"><sup>25</sup></a> </p><p>In 2017, Google sold Terra Bella and its SkySat satellite constellation to <a href="/facts/Planet_Labs/IF1z08vV">Planet Labs</a>, adding to their existing fleet of around 50 satellites,<a class="footnote-ref" id="fnref:26" href="#fn:26"><sup>26</sup></a> for an undisclosed price and entered into a multi-year agreement to purchase SkySat imaging data.<a class="footnote-ref" id="fnref:27" href="#fn:27"><sup>27</sup></a> Planet Labs launched six more SkySat satellites, along with four <a href="/facts/Dove_(satellite)/IF1z08vV">Dove</a> <a href="/facts/CubeSat/jL2IpYKd">CubeSats</a>, on a <a href="/facts/Minotaur-C/XQDB2hca">Minotaur-C</a> rocket from <a href="/facts/Vandenberg_Air_Force_Base/CHNed3F4">Vandenberg Air Force Base</a> on 31 October 2017.<a class="footnote-ref" id="fnref:28" href="#fn:28"><sup>28</sup></a><a class="footnote-ref" id="fnref:29" href="#fn:29"><sup>29</sup></a> An additional two SkySat satellites and three Dove CubeSats were launched on a <a href="/facts/Falcon_9/mNck6vby">Falcon 9</a> rocket from Vandenberg on 3 December 2018.<a class="footnote-ref" id="fnref:30" href="#fn:30"><sup>30</sup></a><a class="footnote-ref" id="fnref:31" href="#fn:31"><sup>31</sup></a> </p> <h2 id="satellite-constellation">Satellite constellation</h2> <p>The SkySat satellites are based on the <a href="/facts/CubeSat/jL2IpYKd">CubeSat</a> concept, using inexpensive automotive grade electronics and fast commercially available processors,<a class="footnote-ref" id="fnref:32" href="#fn:32"><sup>32</sup></a> but scaled up to approximately the size of a <a href="/facts/Refrigerator/TGb5ozLY">minifridge</a>.<a class="footnote-ref" id="fnref:33" href="#fn:33"><sup>33</sup></a> The satellites are approximately 80 centimetres (31 in) long, compared to approximately 30 centimetres (12 in) for a 3U CubeSat, and weigh 220 pounds (100 kg).<a class="footnote-ref" id="fnref:34" href="#fn:34"><sup>34</sup></a> </p><p>The first three prototype satellites (SkySat-1, 2 and 3) were produced by Skybox Imaging in-house. SkySats 1 & 2 did not have a propulsion system, SkySat 3 had a propulsion system built by ECAPS in Sweden.<a class="footnote-ref" id="fnref:35" href="#fn:35"><sup>35</sup></a> </p><p>The other 13 satellites are manufactured by <a href="/facts/SSL_(company)/HUcaqLl2">SSL</a>,<a class="footnote-ref" id="fnref:36" href="#fn:36"><sup>36</sup></a> the optical payloads are built by <a href="/facts/L3_Technologies/wkPMGW66">L3 Technologies</a>,<a class="footnote-ref" id="fnref:37" href="#fn:37"><sup>37</sup></a><a class="footnote-ref" id="fnref:38" href="#fn:38"><sup>38</sup></a> and the satellite thrusters are provided by <a href="/facts/ECAPS/78UxPju5">ECAPS</a>.<a class="footnote-ref" id="fnref:39" href="#fn:39"><sup>39</sup></a> The 13 SkySat-C satellites are slightly larger and heavier (with mass about 120 kg or 264 lbs) than the prototypes. They have a planned operational life of 6 years.<a class="footnote-ref" id="fnref:40" href="#fn:40"><sup>40</sup></a> </p><p>The SkySat-C satellites were put on a 500-kilometre (310 mi) <a href="/facts/Sun-synchronous_orbit/3HonupUd">Sun-synchronous orbit</a>.<a class="footnote-ref" id="fnref:41" href="#fn:41"><sup>41</sup></a> </p><p>Three of Planet's commercial SkySat (SkySat-16, -17 and -18) Earth-imaging spacecraft launched on top of a stack of 58 SpaceX Starlink-8 satellites on 13 June 2020 aboard a Falcon 9 rocket,<a class="footnote-ref" id="fnref:42" href="#fn:42"><sup>42</sup></a> and three more (SkySat-19, -20 and -21) hitched a ride on another SpaceX mission on August 18, 2020. Built by <a href="/facts/Maxar_Technologies/ta0E2dJD">Maxar Technologies</a>, each of the SkySat satellites weighs around 110 kilograms (240 lb) at launch. The SkySats are about the size of a mini-refrigerator, and their optical instruments produce images of Earth with a resolution of 50 cm, according to Planet.<a class="footnote-ref" id="fnref:43" href="#fn:43"><sup>43</sup></a> </p> <h3>List of satellites</h3> <p>There have been 21 satellites launched. </p> <table><tbody><tr><th>Name</th><th>Alt name</th><th><a href="/facts/International_Designator/AwfuQFUY">COSPAR ID</a></th><th>Date of launch</th><th>Rocket</th><th>Launch site</th><th>Refs</th></tr><tr><td>SkySat-1</td><td></td><td>2013-066C</td><td>21 November 2013</td><td><a href="/facts/Dnepr_(rocket)/g3VIdEfT">Dnepr</a></td><td><a href="/facts/Dombarovsky_Air_Base/Lonyn6ke">Dombarovsky Air Base</a>, <a href="/facts/Russia/jfkCwyxn">Russia</a></td><td><a class="footnote-ref" id="fnref:44" href="#fn:44"><sup>44</sup></a></td></tr><tr><td>SkySat-2</td><td></td><td>2014-037D</td><td>8 July 2014</td><td><a href="/facts/Soyuz-2/U3nHlUKx">Soyuz-2.1b</a></td><td><a href="/facts/Baikonur_Cosmodrome/sk16LwcH">Baikonur</a>, <a href="/facts/Kazakhstan/Vfs8NI6e">Kazakhstan</a></td><td><a class="footnote-ref" id="fnref:45" href="#fn:45"><sup>45</sup></a></td></tr><tr><td>SkySat-3</td><td>SkySat-C1SkySat Gen2-1</td><td>2016-040C</td><td>22 June 2016</td><td><a href="/facts/PSLV/KantsJM7">PSLV</a>-XL <a href="/facts/PSLV-C34/1KC1t23c">C34</a></td><td><a href="/facts/Satish_Dhawan_Space_Centre/GkXD3tL3">SHAR, Sriharikota</a>, <a href="/facts/India/1kKHcnxM">India</a></td><td><a class="footnote-ref" id="fnref:46" href="#fn:46"><sup>46</sup></a></td></tr><tr><td>SkySat-4</td><td>SkySat-C2</td><td>2016-058D</td><td>16 September 2016</td><td><a href="/facts/Vega_(rocket)/AuH9mJ32">Vega</a></td><td><a href="/facts/Guiana_Space_Centre/hp6TSJ6W">Centre Spatial Guyanais</a>, <a href="/facts/Kourou/wvDVpjpJ">Kourou</a></td><td><a class="footnote-ref" id="fnref:47" href="#fn:47"><sup>47</sup></a></td></tr><tr><td>SkySat-5</td><td>SkySat-C3</td><td>2016-058E</td><td>16 September 2016</td><td><a href="/facts/Vega_(rocket)/AuH9mJ32">Vega</a></td><td><a href="/facts/Guiana_Space_Centre/hp6TSJ6W">Centre Spatial Guyanais</a>, <a href="/facts/Kourou/wvDVpjpJ">Kourou</a></td><td><a class="footnote-ref" id="fnref:48" href="#fn:48"><sup>48</sup></a></td></tr><tr><td>SkySat-6</td><td>SkySat-C4</td><td>2016-058B</td><td>16 September 2016</td><td><a href="/facts/Vega_(rocket)/AuH9mJ32">Vega</a></td><td><a href="/facts/Guiana_Space_Centre/hp6TSJ6W">Centre Spatial Guyanais</a>, <a href="/facts/Kourou/wvDVpjpJ">Kourou</a></td><td><a class="footnote-ref" id="fnref:49" href="#fn:49"><sup>49</sup></a></td></tr><tr><td>SkySat-7</td><td>SkySat-C5</td><td>2016-058C</td><td>16 September 2016</td><td><a href="/facts/Vega_(rocket)/AuH9mJ32">Vega</a></td><td><a href="/facts/Guiana_Space_Centre/hp6TSJ6W">Centre Spatial Guyanais</a>, <a href="/facts/Kourou/wvDVpjpJ">Kourou</a></td><td><a class="footnote-ref" id="fnref:50" href="#fn:50"><sup>50</sup></a></td></tr><tr><td>SkySat-8</td><td>SkySat-C6</td><td>2017-068F</td><td>31 October 2017</td><td><a href="/facts/Minotaur-C/XQDB2hca">Minotaur-C 3210</a></td><td><a href="/facts/Vandenberg_Air_Force_Base/CHNed3F4">Vandenberg Air Force Base</a></td><td><a class="footnote-ref" id="fnref:51" href="#fn:51"><sup>51</sup></a></td></tr><tr><td>SkySat-9</td><td>SkySat-C7</td><td>2017-068E</td><td>31 October 2017</td><td><a href="/facts/Minotaur-C/XQDB2hca">Minotaur-C 3210</a></td><td><a href="/facts/Vandenberg_Air_Force_Base/CHNed3F4">Vandenberg Air Force Base</a></td><td><a class="footnote-ref" id="fnref:52" href="#fn:52"><sup>52</sup></a></td></tr><tr><td>SkySat-10</td><td>SkySat-C8</td><td>2017-068D</td><td>31 October 2017</td><td><a href="/facts/Minotaur-C/XQDB2hca">Minotaur-C 3210</a></td><td><a href="/facts/Vandenberg_Air_Force_Base/CHNed3F4">Vandenberg Air Force Base</a></td><td><a class="footnote-ref" id="fnref:53" href="#fn:53"><sup>53</sup></a></td></tr><tr><td>SkySat-11</td><td>SkySat-C9</td><td>2017-068C</td><td>31 October 2017</td><td><a href="/facts/Minotaur-C/XQDB2hca">Minotaur-C 3210</a></td><td><a href="/facts/Vandenberg_Air_Force_Base/CHNed3F4">Vandenberg Air Force Base</a></td><td><a class="footnote-ref" id="fnref:54" href="#fn:54"><sup>54</sup></a></td></tr><tr><td>SkySat-12</td><td>SkySat-C10</td><td>2017-068B</td><td>31 October 2017</td><td><a href="/facts/Minotaur-C/XQDB2hca">Minotaur-C 3210</a></td><td><a href="/facts/Vandenberg_Air_Force_Base/CHNed3F4">Vandenberg Air Force Base</a></td><td><a class="footnote-ref" id="fnref:55" href="#fn:55"><sup>55</sup></a></td></tr><tr><td>SkySat-13</td><td>SkySat-C11</td><td>2017-068A</td><td>31 October 2017</td><td><a href="/facts/Minotaur-C/XQDB2hca">Minotaur-C 3210</a></td><td><a href="/facts/Vandenberg_Air_Force_Base/CHNed3F4">Vandenberg Air Force Base</a></td><td><a class="footnote-ref" id="fnref:56" href="#fn:56"><sup>56</sup></a></td></tr><tr><td>SkySat-14</td><td>SkySat-C12</td><td>2018-099AR</td><td>3 December 2018</td><td><a href="/facts/Falcon_9/mNck6vby">Falcon 9 Block 5</a></td><td><a href="/facts/Vandenberg_Air_Force_Base/CHNed3F4">Vandenberg Air Force Base</a></td><td><a class="footnote-ref" id="fnref:57" href="#fn:57"><sup>57</sup></a></td></tr><tr><td>SkySat-15</td><td>SkySat-C13</td><td>2018-099AW</td><td>3 December 2018</td><td><a href="/facts/Falcon_9/mNck6vby">Falcon 9 Block 5</a></td><td><a href="/facts/Vandenberg_Air_Force_Base/CHNed3F4">Vandenberg Air Force Base</a></td><td><a class="footnote-ref" id="fnref:58" href="#fn:58"><sup>58</sup></a></td></tr><tr><td>SkySat-16</td><td>SkySat-C14</td><td>2020-038BL</td><td>13 June 2020</td><td><a href="/facts/Falcon_9/mNck6vby">Falcon 9 Block 5</a></td><td><a href="/facts/Cape_Canaveral_Air_Force_Station/dwJ9MCPH">Cape Canaveral Air Force Station</a>, <a href="/facts/SLC-40/z6Ql3cuD">SLC-40</a></td><td><a class="footnote-ref" id="fnref:59" href="#fn:59"><sup>59</sup></a></td></tr><tr><td>SkySat-17</td><td>SkySat-C15</td><td>2020-038BM</td><td>13 June 2020</td><td><a href="/facts/Falcon_9/mNck6vby">Falcon 9 Block 5</a></td><td><a href="/facts/Cape_Canaveral_Air_Force_Station/dwJ9MCPH">Cape Canaveral Air Force Station</a>, <a href="/facts/SLC-40/z6Ql3cuD">SLC-40</a></td><td><a class="footnote-ref" id="fnref:60" href="#fn:60"><sup>60</sup></a></td></tr><tr><td>SkySat-18</td><td>SkySat-C16</td><td>2020-038BN</td><td>13 June 2020</td><td><a href="/facts/Falcon_9/mNck6vby">Falcon 9 Block 5</a></td><td><a href="/facts/Cape_Canaveral_Air_Force_Station/dwJ9MCPH">Cape Canaveral Air Force Station</a>, <a href="/facts/SLC-40/z6Ql3cuD">SLC-40</a></td><td><a class="footnote-ref" id="fnref:61" href="#fn:61"><sup>61</sup></a></td></tr><tr><td>SkySat-19</td><td>SkySat-C17</td><td>2020-057BQ</td><td>18 August 2020</td><td><a href="/facts/Falcon_9/mNck6vby">Falcon 9 Block 5</a></td><td><a href="/facts/Cape_Canaveral_Air_Force_Station/dwJ9MCPH">Cape Canaveral Air Force Station</a>, <a href="/facts/SLC-40/z6Ql3cuD">SLC-40</a></td><td><a class="footnote-ref" id="fnref:62" href="#fn:62"><sup>62</sup></a></td></tr><tr><td>SkySat-20</td><td>SkySat-C18</td><td>2020-057BR</td><td>18 August 2020</td><td><a href="/facts/Falcon_9/mNck6vby">Falcon 9 Block 5</a></td><td><a href="/facts/Cape_Canaveral_Air_Force_Station/dwJ9MCPH">Cape Canaveral Air Force Station</a>, <a href="/facts/SLC-40/z6Ql3cuD">SLC-40</a></td><td><a class="footnote-ref" id="fnref:63" href="#fn:63"><sup>63</sup></a></td></tr><tr><td>SkySat-21</td><td>SkySat-C19</td><td>2020-057BS</td><td>18 August 2020</td><td><a href="/facts/Falcon_9/mNck6vby">Falcon 9 Block 5</a></td><td><a href="/facts/Cape_Canaveral_Air_Force_Station/dwJ9MCPH">Cape Canaveral Air Force Station</a>, <a href="/facts/SLC-40/z6Ql3cuD">SLC-40</a></td><td><a class="footnote-ref" id="fnref:64" href="#fn:64"><sup>64</sup></a></td></tr></tbody></table> <h2 id="external-links">External links</h2> Wikimedia Commons has media related to SkySat. <ul><li><a href="https://www.planet.com/products/hi-res-monitoring/">Official website</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>"Ten things you must know about Isro's record launch of 20 satellites". Hindustan Times. 21 June 2016. Retrieved 5 June 2018. <a href="https://www.hindustantimes.com/india-news/ten-things-you-must-know-about-isro-s-record-launch-of-20-satellites/story-YJizWHqqhTYjoIyfcaMPBL.html" target="_blank">https://www.hindustantimes.com/india-news/ten-things-you-must-know-about-isro-s-record-launch-of-20-satellites/story-YJizWHqqhTYjoIyfcaMPBL.html</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>"Terra Bella Officially Joins Planet". planet.com. Retrieved 18 April 2017. <a href="https://www.planet.com/pulse/terra-bella-officially-joins-planet/" target="_blank">https://www.planet.com/pulse/terra-bella-officially-joins-planet/</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Perry, Tekla S. (1 May 2013). "Start-up Profile: Skybox Imaging". IEEE Spectrum. Retrieved 12 May 2014. <a href="https://spectrum.ieee.org/startup-profile-skybox-imaging" target="_blank">https://spectrum.ieee.org/startup-profile-skybox-imaging</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>Henry, Caleb (5 August 2014). "Google Closes Skybox Imaging Purchase". Via Satellite. Retrieved 10 August 2014. <a href="http://www.satellitetoday.com/technology/2014/08/05/google-closes-skybox-imaging-purchase/" target="_blank">http://www.satellitetoday.com/technology/2014/08/05/google-closes-skybox-imaging-purchase/</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>Wogan, David (30 December 2013). "High-definition video from space is available for purchase finally". Scientific American. Retrieved 12 May 2014. <a href="http://blogs.scientificamerican.com/plugged-in/2013/12/30/high-definition-video-from-space-is-available-for-purchase-finally/" target="_blank">http://blogs.scientificamerican.com/plugged-in/2013/12/30/high-definition-video-from-space-is-available-for-purchase-finally/</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>Wogan, David (30 December 2013). "High-definition video from space is available for purchase finally". Scientific American. Retrieved 12 May 2014. <a href="http://blogs.scientificamerican.com/plugged-in/2013/12/30/high-definition-video-from-space-is-available-for-purchase-finally/" target="_blank">http://blogs.scientificamerican.com/plugged-in/2013/12/30/high-definition-video-from-space-is-available-for-purchase-finally/</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> <li id="fn:7"><p>Burns, Matt (17 April 2012). 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Retrieved 16 March 2021. <a href="https://space.skyrocket.de/doc_sdat/skysat-3.htm" target="_blank">https://space.skyrocket.de/doc_sdat/skysat-3.htm</a> <a href="#fnref:61" class="footnote-back-ref">↩</a></p></li> <li id="fn:62"><p>"SkySat 3, ..., 21 (SkySat C1, ..., 19)". Gunter's Space Page. 6 June 2013. Retrieved 16 March 2021. <a href="https://space.skyrocket.de/doc_sdat/skysat-3.htm" target="_blank">https://space.skyrocket.de/doc_sdat/skysat-3.htm</a> <a href="#fnref:62" class="footnote-back-ref">↩</a></p></li> <li id="fn:63"><p>"SkySat 3, ..., 21 (SkySat C1, ..., 19)". Gunter's Space Page. 6 June 2013. Retrieved 16 March 2021. <a href="https://space.skyrocket.de/doc_sdat/skysat-3.htm" target="_blank">https://space.skyrocket.de/doc_sdat/skysat-3.htm</a> <a href="#fnref:63" class="footnote-back-ref">↩</a></p></li> <li id="fn:64"><p>"SkySat 3, ..., 21 (SkySat C1, ..., 19)". Gunter's Space Page. 6 June 2013. Retrieved 16 March 2021. <a href="https://space.skyrocket.de/doc_sdat/skysat-3.htm" target="_blank">https://space.skyrocket.de/doc_sdat/skysat-3.htm</a> <a href="#fnref:64" class="footnote-back-ref">↩</a></p></li> </ol>