Cora»Occultation

2025-11-19 / UCAC4 339-193277 / (375) Ursula

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Deborah Smith	O+	VID	M300	ES	GPS	19:42:42	19:43:42.961	19:43:47.563	19:44:42	0.029	0.029	4.60	136.6
2	show	Deborah Smith, Eric Smith	O+	VID	M150	ES	GPS	19:42:44	19:43:41.574	19:43:47.634	19:44:44	0.087	0.087	6.06	180.0
3	show	Javier De Elías	O+	VID	M306	ES	GPS	19:42:22	19:43:41.8	19:43:48.1	19:44:30	0.400	0.200	6.30	187.1

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#107 : bb5d4be0-ddb8-11f0-547e-479429fdc183 [db: observed]

Using prediction bb5d4be0-ddb8-11f0-547e-479429fdc183 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:
Ellipse profile fit was not successful. Trying circular fit.

Circular diameter = 183 km

From 3 chords (VID)

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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] : bb5d4be0-ddb8-11f0-547e-479429fdc183 [observed] Occultation Date + Time : 2025-11-19 at 19:40:44 UT +/- 0.01 min [1] Object Designation : (375) Ursula Orbit Class : MBA Star Designation : GDR3 6855739261595865472 Star Coordinates (ICRF) : RA = 20 32 25.9447, DE = -22 12 13.399 [2] Star Magnitudes : G = 11.74 mag, RP = 11.23 mag, BP = 12.08 mag Object Magnitude : V = 12.96 mag Estimated Magnitude Drop : 1.5 mag Estimated Max. Duration : 3.7 sec Object Mean Diameter : 109.5 km (src: astorb) Speed of the shadow : 29.7 km/s Elongation to Moon & Sun : 72° (sunlit = 0%), Sun = 67° Cross-track uncertainty : 2.3 mas = 5 km = 0.05 path-width (1-sig) RUWE and duplicate source : 0.97 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#107 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : bb5d4be0-ddb8-11f0-547e-479429fdc183 [observed]

 Occultation Date + Time   : 2025-11-19 at 19:40:44 UT +/- 0.01 min  [1]
 Object Designation        : (375) Ursula
 Orbit Class               : MBA
 Star Designation          : GDR3 6855739261595865472
 Star Coordinates (ICRF)   : RA = 20 32 25.9447, DE = -22 12 13.399  [2]
 Star Magnitudes           : G = 11.74 mag, RP = 11.23 mag, BP = 12.08 mag
 Object Magnitude          : V = 12.96 mag
 Estimated Magnitude Drop  : 1.5 mag
 Estimated Max. Duration   : 3.7 sec
 Object Mean Diameter      : 109.5 km  (src: astorb)
 Speed of the shadow       : 29.7 km/s
 Elongation to Moon & Sun  : 72° (sunlit = 0%), Sun = 67°
 Cross-track uncertainty   : 2.3 mas = 5 km = 0.05 path-width (1-sig)
 RUWE and duplicate source : 0.97 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#107
 Note                      : FP:true

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

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