Cora»Occultation

2025-11-20 / HIP 27276 / (1473) Ounas

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Derrick Ward	O+	VID	M200	GB	NTP	00:46:12	00:47:10.91	00:47:12.34	00:48:12	0.030	0.030	1.43	15.0
2	show	Tim Haymes	O+	VID	M280	GB	GPS	00:45:31	00:47:06.45	00:47:07.96	00:48:31	0.020	0.020	1.51	15.9

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#67 : bc0a7bd0-ddb8-11f0-547e-64fafcf9d0ec [db: observed]

Using prediction bc0a7bd0-ddb8-11f0-547e-64fafcf9d0ec 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 = 2319.6, 30.2 km
Circular diameter = 16 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] : bc0a7bd0-ddb8-11f0-547e-64fafcf9d0ec [observed] Occultation Date + Time : 2025-11-20 at 00:49:21 UT +/- 0.0 min [1] Object Designation : (1473) Ounas Orbit Class : MBA Star Designation : GDR3 3336242192224862976 Star Coordinates (ICRF) : RA = 05 46 49.7893, DE = +09 39 46.115 [2] Star Magnitudes : G = 7.4 mag, RP = 6.73 mag, BP = 7.91 mag Object Magnitude : V = 15.48 mag Estimated Magnitude Drop : 8.1 mag Estimated Max. Duration : 1.7 sec Object Mean Diameter : 17.6 km (src: astorb) Speed of the shadow : 10.5 km/s Elongation to Moon & Sun : 144° (sunlit = 0%), Sun = 148° Cross-track uncertainty : 0.4 mas = 0 km = 0.03 path-width (1-sig) RUWE and duplicate source : 1.0 mas, dup.src = 1 (0:false, 1:true) Ephemeris Reference : JPL#67 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

Occultation UUID [and DB] : bc0a7bd0-ddb8-11f0-547e-64fafcf9d0ec [observed] Occultation Date + Time : 2025-11-20 at 00:49:21 UT +/- 0.0 min [1] Object Designation : (1473) Ounas Orbit Class : MBA Star Designation : GDR3 3336242192224862976 Star Coordinates (ICRF) : RA = 05 46 49.7893, DE = +09 39 46.115 [2] Star Magnitudes : G = 7.4 mag, RP = 6.73 mag, BP = 7.91 mag Object Magnitude : V = 15.48 mag Estimated Magnitude Drop : 8.1 mag Estimated Max. Duration : 1.7 sec Object Mean Diameter : 17.6 km (src: astorb) Speed of the shadow : 10.5 km/s Elongation to Moon & Sun : 144° (sunlit = 0%), Sun = 148° Cross-track uncertainty : 0.4 mas = 0 km = 0.03 path-width (1-sig) RUWE and duplicate source : 1.0 mas, dup.src = 1 (0:false, 1:true) Ephemeris Reference : JPL#67 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

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