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Stellar Occultation by (31087) Oirase on 2026-09-19 (00:20:08 UT)

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


Event Details
 Occultation UUID [and db] : d86b53e0-d9b0-11f1-43f3-e55ebffb01f1 [observed]

 Occultation Date + Time   : 2026-09-19 at 00:20:08 UT +/- 0.02 min  [1]
 Object Designation        : (31087) Oirase
 Star Designation          : GDR3 6840299713159040640
 Star Coordinates (ICRF)   : RA = 21 51 55.3008, DE = -14 07 13.274  [2]
 Star Magnitudes           : G = 12.33 mag, RP = 11.86 mag, BP = 12.63 mag
 Object Magnitude          : V = 18.47 mag
 Estimated Magnitude Drop  : 6.1 mag
 Estimated Max. Duration   : 0.6 sec
 Speed of the shadow       : 9.0 km/s
 Object Mean Diameter      : 5.4 km  (src: astorb) => apparent = 4 mas
 Apparent Motion           : 0.3767 arcs/min @ PA = 272 deg
 Horizontal Parallax       : 4.4430 arcs
 Dynamical Class           : MBA
 Elongation to Moon & Sun  : 58° (sunlit = 52%), Sun = 149°
 Cross-track uncertainty   : 3.3 mas = 4 km = 0.88 path-width (1-sig)
 RUWE and duplicate source : 1.35 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL46
 Note                      : FP:true

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


More Data and Informations
SiMDA | 3D Asteroid Catalogue | Johnston Archive | Star at CDS (Vizier) | JPL Small-Body Node | Minor Planet Center | Wikipedia
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