Subj : Daily APOD Report To : All From : Ben Ritchey Date : Sat Jun 01 2019 11:36:27 Astronomy Picture of the Day Astronomy Picture of the Day Discover the cosmos! [1] Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2019 June 1 [2] NICER at Night Image Credit: NASA [3] , NICER [4] Explanation: A payload on board the International Space Station, the Neutron star Interior Composition Explorer (NICER) twists and turns [5] to track cosmic sources of X-rays as the station orbits planet Earth every 93 minutes. During orbit nighttime [6] , its X-ray detectors remain on. So as NICER slews from target to target bright arcs and loops are traced across this all-sky map made from 22 months of NICER data. The arcs tend to converge on prominent bright spots [7] , pulsars in the X-ray sky that NICER regularly targets and monitors. The pulsars are spinning neutron stars that emit clock-like pulses of X-rays. Their timing is so precise it can be used for navigation [8] , determining spacecraft speed and position. This NICER X-ray, all-sky, map is composed in coordinates with the celestial equator [9] horizontally across the center. Tomorrow's picture: live from low Earth orbit ------------------------------------------------------------------------------- < [10] | Archive [11] | Submissions [12] | Index [13] | Search [14] | Calendar [15] | RSS [16] | Education [17] | About APOD [18] | Discuss [19] | > [20] ------------------------------------------------------------------------------- Authors & editors: Robert Nemiroff [21] (MTU [22] ) & Jerry Bonnell [23] (UMCP [24] ) NASA Official: Phillip Newman Specific rights apply [25] . NASA Web Privacy Policy and Important Notices [26] A service of: ASD [27] at NASA [28] / GSFC [29] & Michigan Tech. U. [30] ---------- Site notes: [1] archivepix.html [2] image/1906/NICERNightMovesnolabels_0.jpg [3] https://www.nasa.gov/ [4] https://www.nasa.gov/nicer [5] https://svs.gsfc.nasa.gov/13031 [6] https://www.nasa.gov/feature/goddard/2019/ nicer-s-night-moves-trace-the-x-ray-sky [7] image/1906/NICERNightMoveslabels_0.jpg [8] https://www.nasa.gov/feature/goddard/2018/ nasa-team-first-to-demonstrate-x-ray-navigation-in-space [9] ap190321.html [10] ap190531.html [11] archivepix.html [12] lib/apsubmit2015.html [13] lib/aptree.html [14] http://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search [15] calendar/allyears.html [16] /apod.rss [17] lib/edlinks.html [18] lib/about_apod.html [19] http://asterisk.apod.com/discuss_apod.php?date=190601 [20] ap190602.html [21] http://www.phy.mtu.edu/faculty/Nemiroff.html [22] http://www.phy.mtu.edu/ [23] http://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html [24] http://www.astro.umd.edu/ [25] lib/about_apod.html#srapply [26] http://www.nasa.gov/about/highlights/HP_Privacy.html [27] http://astrophysics.gsfc.nasa.gov/ [28] http://www.nasa.gov/ [29] http://www.nasa.gov/centers/goddard/ [30] http://www.mtu.edu/ --- Mystic BBS v1.12 A43 (Windows/32) * Origin: FIDONet - The Positronium Repository (1:393/68) .