Cora»Occultation

2025-11-10 / UCAC4 561-007522 / (54581) 2000 QW170

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Peter Nosal	O+	VID	M250	SK	NTP	18:01:14	18:02:50.560	18:02:51.260	18:04:01	0.030	0.020	0.70	11.1
2	show	Peter Nosal, Paula Libic	O+	VID	M200	SK	NTP	18:02:27	18:02:50.720	18:02:51.120	18:03:08	0.050	0.050	0.40	6.4

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

2 observations found in db: sodis

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

JPL#43 : b256cf80-ddb8-11f0-547e-977a2fcfdc3f [db: observed]

Using prediction b256cf80-ddb8-11f0-547e-977a2fcfdc3f 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 = 1519.8, 25.8 km
Circular diameter = 14 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] : b256cf80-ddb8-11f0-547e-977a2fcfdc3f [observed] Occultation Date + Time : 2025-11-10 at 18:00:02 UT +/- 0.06 min [1] Object Designation : (54581) 2000 QW170 Orbit Class : JTRO Star Designation : GDR3 0064414583772050560 Star Coordinates (ICRF) : RA = 03 41 03.3275, DE = +22 06 53.548 [2] Star Magnitudes : G = 13.16 mag, RP = 12.46 mag, BP = 13.7 mag Object Magnitude : V = 18.97 mag Estimated Magnitude Drop : 5.8 mag Estimated Max. Duration : 0.7 sec Object Mean Diameter : 11.6 km (src: astorb) Speed of the shadow : 15.9 km/s Elongation to Moon & Sun : 62° (sunlit = 66%), Sun = 170° Cross-track uncertainty : 2.7 mas = 7 km = 0.65 path-width (1-sig) RUWE and duplicate source : 1.09 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#43 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : b256cf80-ddb8-11f0-547e-977a2fcfdc3f [observed]

 Occultation Date + Time   : 2025-11-10 at 18:00:02 UT +/- 0.06 min  [1]
 Object Designation        : (54581) 2000 QW170
 Orbit Class               : JTRO
 Star Designation          : GDR3 0064414583772050560
 Star Coordinates (ICRF)   : RA = 03 41 03.3275, DE = +22 06 53.548  [2]
 Star Magnitudes           : G = 13.16 mag, RP = 12.46 mag, BP = 13.7 mag
 Object Magnitude          : V = 18.97 mag
 Estimated Magnitude Drop  : 5.8 mag
 Estimated Max. Duration   : 0.7 sec
 Object Mean Diameter      : 11.6 km  (src: astorb)
 Speed of the shadow       : 15.9 km/s
 Elongation to Moon & Sun  : 62° (sunlit = 66%), Sun = 170°
 Cross-track uncertainty   : 2.7 mas = 7 km = 0.65 path-width (1-sig)
 RUWE and duplicate source : 1.09 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#43
 Note                      : FP:true

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

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