Cora»Occultation

2026-05-19 / UCAC4 424-061098 / (498) Tokio

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Peter Delincak	O+	VID	M400	SK	NTP	23:17:49	23:19:20.723	23:19:25.613	23:21:29	0.017	0.017	4.89	59.2
2	show	Jiri Kubanek	O+	VID	M303	CZ	GPS	23:18:49	23:19:49.090	23:19:54.350	23:20:50	0.030	0.020	5.26	63.6
3	show	Daniel Blazewicz	O+	VID	M350	PL	GPS	23:18:09	23:19:13.99	23:19:19.56	23:20:36	0.030	0.020	5.57	67.4
4	show	Wacław Pieczonka	O+	VID	M200	PL	NTP	23:17:11	23:19:05.20	23:19:10.26	23:21:00	0.180	0.130	5.06	61.2
5	show	Marcin Filipek	O+	VID	M250	PL	GPS	23:18:40	23:19:17.93	23:19:22.53	23:20:00	0.050	0.030	4.60	55.7

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

5 observations found in db: sodis

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

JPL#111 : 24354fc0-33ca-11f1-6999-73cbf7f7e76e [db: asteroids]

Using prediction 24354fc0-33ca-11f1-6999-73cbf7f7e76e for map and profile fit

Get observations as KML file (reduced site location resolution)

Ellipse and circular profile fits to the timings (chords)

Auto-Fit Result:
Size = 89 x 71 km
a',b' = 44.3, 35.3 km
X0,Y0 = -350.6, 9.6 km
Mean diameter = 79 km

From 5 chords (VID)

You can enter space separated chord numbers (example: 11 4 8) or a method like VIS to ignore all visual timings, or a time source like RAD and NTP (but not GPS).
If the plot disappears, then there are less than 2 chords left (too much ignored, go back with browser).

Check SiMDA for size and mass data.

Check Johnston Archive for satellites.

Map with groundtrack and observer stations

Event Details
Occultation UUID [and DB] : 24354fc0-33ca-11f1-6999-73cbf7f7e76e [asteroids] Occultation Date + Time : 2026-05-19 at 23:21:01 UT +/- 0.0 min [1] Object Designation : (498) Tokio Orbit Class : MBA Star Designation : GDR3 6334251273181716096 Star Coordinates (ICRF) : RA = 14 58 37.0837, DE = -05 23 17.926 [2] Star Magnitudes : G = 12.56 mag, RP = 12.03 mag, BP = 12.92 mag Object Magnitude : V = 12.75 mag Estimated Magnitude Drop : 0.9 mag Estimated Max. Duration : 6.9 sec Object Mean Diameter : 82.8 km (src: astorb) Speed of the shadow : 12.1 km/s Elongation to Moon & Sun : 119° (sunlit = 14%), Sun = 161° Cross-track uncertainty : 1.0 mas = 1 km = 0.02 path-width (1-sig) RUWE and duplicate source : 1.21 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#111 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : 24354fc0-33ca-11f1-6999-73cbf7f7e76e [asteroids]

 Occultation Date + Time   : 2026-05-19 at 23:21:01 UT +/- 0.0 min  [1]
 Object Designation        : (498) Tokio
 Orbit Class               : MBA
 Star Designation          : GDR3 6334251273181716096
 Star Coordinates (ICRF)   : RA = 14 58 37.0837, DE = -05 23 17.926  [2]
 Star Magnitudes           : G = 12.56 mag, RP = 12.03 mag, BP = 12.92 mag
 Object Magnitude          : V = 12.75 mag
 Estimated Magnitude Drop  : 0.9 mag
 Estimated Max. Duration   : 6.9 sec
 Object Mean Diameter      : 82.8 km  (src: astorb)
 Speed of the shadow       : 12.1 km/s
 Elongation to Moon & Sun  : 119° (sunlit = 14%), Sun = 161°
 Cross-track uncertainty   : 1.0 mas = 1 km = 0.02 path-width (1-sig)
 RUWE and duplicate source : 1.21 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#111
 Note                      : FP:true

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

More Data and Informations

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