Cora»Occultation

2025-10-23 / TYC 5121-00429-1 / (35664) 1998 QC64

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Deborah Smith	O+	VID	M300	ES	GPS	21:20:21	21:21:22.142	21:21:22.592	21:22:21	0.023	0.023	0.45	13.1
2	show	Deborah Smith, Eric Smith	O+	VID	M150	ES	GPS	21:20:20	21:21:21.486	21:21:21.786	21:22:20	0.021	0.021	0.30	8.7
3	show	Deborah Smith	O-	VID	M200	ES	GPS	21:20:20	::	::	21:22:20

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

3 observations found in db: sodis

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

JPL#54 : 9e4ca730-ddb8-11f0-547e-36e4377eb3d9 [db: observed]

Using prediction 9e4ca730-ddb8-11f0-547e-36e4377eb3d9 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:
X0,Y0 = -1444.3, 15.4 km
Circular diameter = 13 km

From 2 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).

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Map with groundtrack and observer stations

Event Details
Occultation UUID [and DB] : 9e4ca730-ddb8-11f0-547e-36e4377eb3d9 [observed] Occultation Date + Time : 2025-10-23 at 21:19:22 UT +/- 0.0 min [1] Object Designation : (35664) 1998 QC64 Orbit Class : MBA Star Designation : GDR3 4256507964150354176 Star Coordinates (ICRF) : RA = 18 40 31.4105, DE = -05 26 08.112 [2] Star Magnitudes : G = 11.45 mag, RP = 10.39 mag, BP = 12.62 mag Object Magnitude : V = 19.27 mag Estimated Magnitude Drop : 7.8 mag Estimated Max. Duration : 0.2 sec Object Mean Diameter : 7.1 km (src: astorb) Speed of the shadow : 29.1 km/s Elongation to Moon & Sun : 49° (sunlit = 5%), Sun = 71° Cross-track uncertainty : 0.4 mas = 0 km = 0.13 path-width (1-sig) RUWE and duplicate source : 0.95 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#54 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

Occultation UUID [and DB] : 9e4ca730-ddb8-11f0-547e-36e4377eb3d9 [observed] Occultation Date + Time : 2025-10-23 at 21:19:22 UT +/- 0.0 min [1] Object Designation : (35664) 1998 QC64 Orbit Class : MBA Star Designation : GDR3 4256507964150354176 Star Coordinates (ICRF) : RA = 18 40 31.4105, DE = -05 26 08.112 [2] Star Magnitudes : G = 11.45 mag, RP = 10.39 mag, BP = 12.62 mag Object Magnitude : V = 19.27 mag Estimated Magnitude Drop : 7.8 mag Estimated Max. Duration : 0.2 sec Object Mean Diameter : 7.1 km (src: astorb) Speed of the shadow : 29.1 km/s Elongation to Moon & Sun : 49° (sunlit = 5%), Sun = 71° Cross-track uncertainty : 0.4 mas = 0 km = 0.13 path-width (1-sig) RUWE and duplicate source : 0.95 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#54 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

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