Cora»OccDetail

Stellar Occultation by (307261) 2002 MS4 on 2026-07-18 (15:27:27 UT)

Event Details
Occultation UUID [and db] : 434dc200-f93f-11ef-4809-93abeebb6b86 [cetnos] Occultation Date + Time : 2026-07-18 at 15:27:27 UT +/- 0.45 min [1] Object Designation : (307261) 2002 MS4 Star Designation : GDR3 4212217088826596096 Star Coordinates (ICRF) : RA = 19 14 47.3093, DE = -04 47 01.196 [2] Star Magnitudes : G = 17.56 mag, RP = 16.89 mag, BP = 18.05 mag Object Magnitude : V = 20.29 mag Estimated Magnitude Drop : 2.8 mag Estimated Max. Duration : 25.9 sec Speed of the shadow : 25.0 km/s Object Mean Diameter : 647.9 km (src: CORA+astorb) => apparent = 20 mas Apparent Motion : 0.0467 arcs/min @ PA = 261 deg Horizontal Parallax : 0.1950 arcs Dynamical Class : TNO Elongation to Moon & Sun : 116° (sunlit = 23%), Sun = 161° Cross-track uncertainty : 5.4 mas = 176 km = 0.27 path-width (1-sig) RUWE and duplicate source : 0.97 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#23 Object is a <TNOs are Cool> target ! [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and db] : 434dc200-f93f-11ef-4809-93abeebb6b86 [cetnos]

 Occultation Date + Time   : 2026-07-18 at 15:27:27 UT +/- 0.45 min  [1]
 Object Designation        : (307261) 2002 MS4
 Star Designation          : GDR3 4212217088826596096
 Star Coordinates (ICRF)   : RA = 19 14 47.3093, DE = -04 47 01.196  [2]
 Star Magnitudes           : G = 17.56 mag, RP = 16.89 mag, BP = 18.05 mag
 Object Magnitude          : V = 20.29 mag
 Estimated Magnitude Drop  : 2.8 mag
 Estimated Max. Duration   : 25.9 sec
 Speed of the shadow       : 25.0 km/s
 Object Mean Diameter      : 647.9 km  (src: CORA+astorb) => apparent = 20 mas
 Apparent Motion           : 0.0467 arcs/min @ PA = 261 deg
 Horizontal Parallax       : 0.1950 arcs
 Dynamical Class           : TNO
 Elongation to Moon & Sun  : 116° (sunlit = 23%), Sun = 161°
 Cross-track uncertainty   : 5.4 mas = 176 km = 0.27 path-width (1-sig)
 RUWE and duplicate source : 0.97 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#23

 Object is a <TNOs are Cool> target !

 [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

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CTU: Cross-track uncertainty (zero means: use the nominal prediction value, see event details below). Offsets and CTU all in mas.