{"id":96379,"date":"2022-05-16T14:45:00","date_gmt":"2022-05-16T18:45:00","guid":{"rendered":"https:\/\/www.nasa.gov\/?migration=converted-node-479586"},"modified":"2024-05-08T17:10:09","modified_gmt":"2024-05-08T21:10:09","slug":"lunar-near-rectilinear-halo-orbit-gateway","status":"publish","type":"post","link":"https:\/\/www.nasa.gov\/centers-and-facilities\/johnson\/lunar-near-rectilinear-halo-orbit-gateway\/","title":{"rendered":"A Lunar Orbit That\u2019s Just Right for the International Gateway"},"content":{"rendered":"\n<p><em><strong>A unique halo orbit is the road less traveled around the Moon.<\/strong><\/em><\/p>\n\n\n<div id=\"\" class=\"hds-media hds-module wp-block-image\"><div class=\"margin-left-auto margin-right-auto nasa-block-align-inline\"><div class=\"hds-media-wrapper margin-left-auto margin-right-auto\"><figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-cover \"><a href=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/05\/nrho-new-1-2.gif\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1041\" height=\"586\" src=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/05\/nrho-new-1-2.gif?w=1041\" class=\"attachment-2048x2048 size-2048x2048\" alt=\"\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" loading=\"eager\" \/><\/a><\/figure><figcaption class=\"hds-caption padding-y-2\"><div class=\"hds-caption-text p-sm margin-0\">Gateway’s near-rectilinear halo orbit, or NRHO, around the Moon. <\/div><div class=\"hds-credits\">NASA<\/div><\/figcaption><\/div><\/div><\/div>\n\n\n<p>As NASA prepares for humanity\u2019s long-term return to the lunar surface through the <a href=\"https:\/\/www.nasa.gov\/specials\/artemis\/\" rel=\"noopener\">Artemis missions<\/a>, the agency is introducing novel concepts \u2013 backed up by science and decades of experience in human spaceflight \u2013 to blaze new trails on and around the Moon.<\/p>\n\n\n\n<p>An international collaboration, <a href=\"https:\/\/www.nasa.gov\/gateway\" rel=\"noopener\">Gateway<\/a> is a human-tended, small station that will orbit the Moon. The lunar outpost is specially designed to enable deep space exploration with many capabilities for maintaining a sustained presence in space and conducting research in a deep space environment. Features like a human habitat, multiple docking ports for a variety of spacecraft, including <a href=\"https:\/\/www.nasa.gov\/exploration\/systems\/orion\/index.html\" rel=\"noopener\">Orion<\/a>, and the ability to host experiments that will study space weather will all help contribute to future exploration efforts. Similarly, Gateway\u2019s unique near-rectilinear halo orbit, or NRHO, was specifically chosen to help ensure the success of future Artemis missions.<\/p>\n\n\n\n<p>There is no shortage of options for how a spacecraft could orbit the Moon, but two in particular \u2013 low lunar orbit and distant retrograde orbit \u2013 are helpful for understanding why NRHO is the right fit for Gateway.<\/p>\n\n\n\n<p>A spacecraft in low lunar orbit follows a circular or elliptical path very close to the lunar surface, completing an orbit every two hours. Transit between Gateway and the lunar surface would be quite simple in a low lunar orbit given their proximity, but because of the Moon\u2019s gravity, more propellant is required to maintain the orbit. Therefore, low lunar orbit is not very efficient for Gateway\u2019s planned long-term presence at the Moon \u2013 at least 15 years.<\/p>\n\n\n\n<p>Meanwhile, a <a href=\"https:\/\/www.nasa.gov\/feature\/orion-will-go-the-distance-in-retrograde-orbit-during-artemis-i\" rel=\"noopener\">distant retrograde orbit<\/a> provides a large, circular, and stable (or more fuel-efficient) orbit that circles the Moon every two weeks. However, what Gateway would gain in a stable orbit, it would lose in easy access to the Moon: the distant orbit would make it harder to get to the lunar surface.<\/p>\n\n\n\n<p>A third option, NRHO, is just right for Gateway, marrying the upsides of low lunar orbit (surface access) with the benefits of distant retrograde orbit (fuel efficiency). Hanging almost like a necklace from the Moon, NRHO is a one-week orbit that is balanced between the Earth\u2019s and Moon\u2019s gravity. This orbit will periodically bring Gateway close enough to the lunar surface to provide simple access to the Moon\u2019s South Pole where astronauts will test capabilities for living on other planetary bodies, including Mars. NRHO can also provide astronauts and their spacecraft with access to other landing sites around the Moon in addition to the South Pole.<\/p>\n\n\n\n<p>The benefits of NRHO don\u2019t end with surface access and fuel efficiency. NRHO will allow scientists to take advantage of the deep space environment for a new era of radiation experiments that will inspire a greater understanding of potential impacts of space weather on people and instruments. NRHO will also give Gateway a continuous line of sight, or \u201cview\u201d, of Earth, translating to uninterrupted communication between Earth and the Moon.<\/p>\n\n\n\n<p>NASA is preparing to launch the Cislunar Autonomous Positioning System Technology Operations and Navigation Experiment, or <a href=\"https:\/\/www.nasa.gov\/directorates\/spacetech\/small_spacecraft\/capstone\" rel=\"noopener\">CAPSTONE mission<\/a>, that will use a 55-pound cube satellite to gather data on the characteristics of NRHO ahead of Gateway\u2019s expected launch no earlier than 2025.<\/p>\n\n\n\n<p>Check out this infographic to learn more about NRHO and what it looks like:<\/p>\n\n\n<div id=\"\" class=\"hds-media hds-module wp-block-image\"><div class=\"margin-left-auto margin-right-auto nasa-block-align-inline\"><div class=\"hds-media-wrapper margin-left-auto margin-right-auto\"><figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-none \"><a href=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/05\/nrho_infographic_may_2022.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"2048\" height=\"1152\" src=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/05\/nrho_infographic_may_2022.jpg?w=2048\" class=\"attachment-2048x2048 size-2048x2048\" alt=\"Infographic depicting NRHO, Gateway's unique near-rectilinear halo orbit \" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" srcset=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/05\/nrho_infographic_may_2022.jpg 3999w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/05\/nrho_infographic_may_2022.jpg?resize=300,169 300w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/05\/nrho_infographic_may_2022.jpg?resize=768,432 768w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/05\/nrho_infographic_may_2022.jpg?resize=1024,576 1024w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/05\/nrho_infographic_may_2022.jpg?resize=1536,864 1536w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/05\/nrho_infographic_may_2022.jpg?resize=2048,1152 2048w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/05\/nrho_infographic_may_2022.jpg?resize=400,225 400w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/05\/nrho_infographic_may_2022.jpg?resize=600,338 600w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/05\/nrho_infographic_may_2022.jpg?resize=900,506 900w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/05\/nrho_infographic_may_2022.jpg?resize=1200,675 1200w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/05\/nrho_infographic_may_2022.jpg?resize=2000,1125 2000w\" sizes=\"(max-width: 2048px) 100vw, 2048px\" \/><\/a><\/figure><\/div><\/div><\/div>\n\n\n<p>For more on Gateway, visit <a href=\"https:\/\/www.nasa.gov\/gateway\" rel=\"noopener\">www.nasa.gov\/gateway<\/a><\/p>\n\n\n\n<p>For more on Artemis, visit www.nasa.gov\/specials\/artemis\/<\/p>\n\n\n\n<div style=\"height:56px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p><em><strong>Note:<\/strong> This article was updated to clarify a potential launch date.<\/em><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The unique lunar orbit of NASA’s Gateway space station will provide Artemis astronauts and their spacecraft access to the entire lunar surface, including the critical lunar South Pole region which is the focus of the Artemis missions. It will also provide unique scientific opportunities within the deep space environment.<\/p>\n","protected":false},"author":306,"featured_media":290764,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"nasa_hds_core_meta_l10n":"en-US","nasa_hds_core_meta_article_editor":"","nasa_hds_core_meta_article_contacts":[],"nasa_hds_core_meta_article_topic":"","nasa_hds_core_meta_linked_locations":[],"nasa_hds_core_meta_article_related_articles":[],"hds_migrate_meta_pr_release_id":"","hds_migrate_meta_pr_release_type":"","nasa_hds_core_meta_location_x":"","nasa_hds_core_meta_location_y":"","nasa_hds_core_meta_gallery_images":[],"footnotes":""},"categories":[2861,2681,2920,3311,2876,3787,2685],"news-tags":[],"internal-terms":[3939,10645,4984,4225,3945],"coauthors":[11024,13182],"parsely":{"version":"1.1.0","meta":{"@context":"https:\/\/schema.org","@type":"NewsArticle","headline":"A Lunar Orbit That\u2019s Just Right for the International Gateway","url":"https:\/\/www.nasa.gov\/centers-and-facilities\/johnson\/lunar-near-rectilinear-halo-orbit-gateway\/","mainEntityOfPage":{"@type":"WebPage","@id":"https:\/\/www.nasa.gov\/centers-and-facilities\/johnson\/lunar-near-rectilinear-halo-orbit-gateway\/"},"thumbnailUrl":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/05\/nrho-new-1-2.gif?w=150&h=150&crop=1","image":{"@type":"ImageObject","url":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/05\/nrho-new-1-2.gif"},"articleSection":"NASA Centers & Facilities","author":[{"@type":"Person","name":"Dylan Connell"},{"@type":"Person","name":"Briana R. Zamora"}],"creator":["Dylan Connell","Briana R. Zamora"],"publisher":{"@type":"Organization","name":"NASA","logo":"https:\/\/www.nasa.gov\/wp-content\/themes\/nasa\/assets\/images\/nasa-logo.svg"},"keywords":["Missions","Artemis","Gateway Space Station","Johnson Space Center","Artemis 4","Artemis Campaign Development Division","Exploration Systems Development Mission Directorate","Gateway Program"],"dateCreated":"2022-05-16T18:45:00Z","datePublished":"2022-05-16T18:45:00Z","dateModified":"2024-05-08T21:10:09Z"},"rendered":"<meta name=\"parsely-title\" content=\"A Lunar Orbit That\u2019s Just Right for the International Gateway\" \/>\n<meta name=\"parsely-link\" content=\"https:\/\/www.nasa.gov\/centers-and-facilities\/johnson\/lunar-near-rectilinear-halo-orbit-gateway\/\" \/>\n<meta name=\"parsely-type\" content=\"post\" \/>\n<meta name=\"parsely-image-url\" content=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/05\/nrho-new-1-2.gif?w=150&h=150&crop=1\" \/>\n<meta name=\"parsely-pub-date\" content=\"2022-05-16T18:45:00Z\" \/>\n<meta name=\"parsely-section\" content=\"NASA Centers & Facilities\" \/>\n<meta name=\"parsely-tags\" content=\"Missions,Artemis,Gateway Space Station,Johnson Space Center,Artemis 4,Artemis Campaign Development Division,Exploration Systems Development Mission Directorate,Gateway Program\" \/>\n<meta name=\"parsely-author\" content=\"Dylan Connell\" \/>\n<meta name=\"parsely-author\" content=\"Briana R. Zamora\" \/>","tracker_url":"https:\/\/cdn.parsely.com\/keys\/nasa.gov\/p.js"},"read_time":3,"time_ago":"2 years","featured_image":{"id":290764,"file":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/05\/nrho-new-1-2.gif","title":"nrho-new-(1)-(2)","alt":"","caption":"Gateway's near-rectilinear halo orbit, or NRHO, around the Moon. 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