Cora»OccDetail

Stellar Occultation by (307261) 2002 MS4 on 2026-07-11 (05:14:16 UT)

Event Details
Occultation UUID [and db] : 52efb320-4099-11f0-4ed7-d3ccfd9e5bb6 [cetnos] Occultation Date + Time : 2026-07-11 at 05:14:16 UT +/- 0.45 min [1] Object Designation : (307261) 2002 MS4 Star Designation : GDR3 4212215134632514304 Star Coordinates (ICRF) : RA = 19 15 20.0593, DE = -04 45 54.271 [2] Star Magnitudes : G = 15.97 mag, RP = 15.13 mag, BP = 16.7 mag Object Magnitude : V = 20.28 mag Estimated Magnitude Drop : 4.3 mag Estimated Max. Duration : 25.7 sec Speed of the shadow : 25.2 km/s Object Mean Diameter : 647.9 km (src: CORA+astorb) => apparent = 20 mas Apparent Motion : 0.0467 arcs/min @ PA = 263 deg Horizontal Parallax : 0.1950 arcs Dynamical Class : TNO Elongation to Moon & Sun : 130° (sunlit = 15%), Sun = 163° Cross-track uncertainty : 5.3 mas = 173 km = 0.27 path-width (1-sig) RUWE and duplicate source : 1.04 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] : 52efb320-4099-11f0-4ed7-d3ccfd9e5bb6 [cetnos]

 Occultation Date + Time   : 2026-07-11 at 05:14:16 UT +/- 0.45 min  [1]
 Object Designation        : (307261) 2002 MS4
 Star Designation          : GDR3 4212215134632514304
 Star Coordinates (ICRF)   : RA = 19 15 20.0593, DE = -04 45 54.271  [2]
 Star Magnitudes           : G = 15.97 mag, RP = 15.13 mag, BP = 16.7 mag
 Object Magnitude          : V = 20.28 mag
 Estimated Magnitude Drop  : 4.3 mag
 Estimated Max. Duration   : 25.7 sec
 Speed of the shadow       : 25.2 km/s
 Object Mean Diameter      : 647.9 km  (src: CORA+astorb) => apparent = 20 mas
 Apparent Motion           : 0.0467 arcs/min @ PA = 263 deg
 Horizontal Parallax       : 0.1950 arcs
 Dynamical Class           : TNO
 Elongation to Moon & Sun  : 130° (sunlit = 15%), Sun = 163°
 Cross-track uncertainty   : 5.3 mas = 173 km = 0.27 path-width (1-sig)
 RUWE and duplicate source : 1.04 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.