Cora»Occultation

2025-11-25 / UCAC4 560-023814 / (5550) 1981 UB1

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	William Stewart	O+	VID	M279	GB	GPS	22:45:32	22:46:26.7	22:46:28.7	22:47:22	0.300	0.300	2.00	14.2

UT1/UT4: Begin/End of observation | UT2/UT3: Begin/End of occultation | Dur: Reported duration in seconds | Chrd: Corresponding chord length in km | More

1 observation found in db: sodis

Available (probably) matching predictions (click on the link to switch):

JPL#72 : c757b3e0-ddb8-11f0-547e-21beaf7e6fef [db: observed]

Using prediction c757b3e0-ddb8-11f0-547e-21beaf7e6fef for map and profile fit

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Event Details
Occultation UUID [and DB] : c757b3e0-ddb8-11f0-547e-21beaf7e6fef [observed] Occultation Date + Time : 2025-11-25 at 22:39:47 UT +/- 0.01 min [1] Object Designation : (5550) 1981 UB1 Orbit Class : MBA Star Designation : GDR3 3423620243843923712 Star Coordinates (ICRF) : RA = 06 03 50.9344, DE = +21 51 02.209 [2] Star Magnitudes : G = 14.71 mag, RP = 14.01 mag, BP = 15.25 mag Object Magnitude : V = 16.08 mag Estimated Magnitude Drop : 1.6 mag Estimated Max. Duration : 1.6 sec Object Mean Diameter : 11.6 km (src: astorb) Speed of the shadow : 7.1 km/s Elongation to Moon & Sun : 144° (sunlit = 27%), Sun = 153° Cross-track uncertainty : 0.4 mas = 0 km = 0.04 path-width (1-sig) RUWE and duplicate source : 1.12 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#72 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

Occultation UUID [and DB] : c757b3e0-ddb8-11f0-547e-21beaf7e6fef [observed] Occultation Date + Time : 2025-11-25 at 22:39:47 UT +/- 0.01 min [1] Object Designation : (5550) 1981 UB1 Orbit Class : MBA Star Designation : GDR3 3423620243843923712 Star Coordinates (ICRF) : RA = 06 03 50.9344, DE = +21 51 02.209 [2] Star Magnitudes : G = 14.71 mag, RP = 14.01 mag, BP = 15.25 mag Object Magnitude : V = 16.08 mag Estimated Magnitude Drop : 1.6 mag Estimated Max. Duration : 1.6 sec Object Mean Diameter : 11.6 km (src: astorb) Speed of the shadow : 7.1 km/s Elongation to Moon & Sun : 144° (sunlit = 27%), Sun = 153° Cross-track uncertainty : 0.4 mas = 0 km = 0.04 path-width (1-sig) RUWE and duplicate source : 1.12 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#72 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

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