Cora»Occultation

2026-10-21 / UCAC4 473-046303 / (194) Prokne

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Peter Nosal	O+	VID	M250	SK	NTP	03:45:01	03:45:32.200	03:45:36.240	03:46:00	0.040	0.040	4.04	140.6
2	show	Peter Delincak	O+	VID	M400	SK	NTP	03:44:37	03:45:32.154	03:45:37.070	03:46:47	0.009	0.009	4.92	171.2
3	show	Petr Zeleny	O+	VID	M250	CZ	GPS	03:44:13	03:45:31.58	03:45:36.54	03:47:06	0.110	0.110	4.96	172.6
4	show	Jiri Kubanek	O+	VID	M303	CZ	GPS	03:45:04	03:45:28.000	03:45:32.500	03:46:38	0.200	0.200	4.50	156.6
5	show	Zdenek Sikac	O+	VID	T150	CZ	GPS	03:44:33	03:45:29.57	03:45:31.38	03:46:38	0.020	0.020	1.81	63.0

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):

JPL172 : 80a3b8b0-d9b4-11f1-43f3-c7afedfff7fc [db: observed]

Using prediction 80a3b8b0-d9b4-11f1-43f3-c7afedfff7fc 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 = 182 x 151 km
a',b' = 91.2, 75.4 km
X0,Y0 = -1015.4, 38.1 km
Mean diameter = 166 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] : 80a3b8b0-d9b4-11f1-43f3-c7afedfff7fc [observed] Occultation Date + Time : 2026-10-21 at 03:47:51 UT +/- 0.0 min [1] Object Designation : (194) Prokne Orbit Class : MBA Star Designation : GDR3 3815979422025540992 Star Coordinates (ICRF) : RA = 10 54 00.6682, DE = +04 27 51.794 [2] Star Magnitudes : G = 11.33 mag, RP = 10.83 mag, BP = 11.66 mag Object Magnitude : V = 14.06 mag Estimated Magnitude Drop : 2.8 mag Estimated Max. Duration : 4.8 sec Object Mean Diameter : 168.4 km (src: astorb) Speed of the shadow : 34.8 km/s Elongation to Moon & Sun : 162° (sunlit = 73%), Sun = 45° Cross-track uncertainty : 0.7 mas = 1 km = 0.01 path-width (1-sig) RUWE and duplicate source : 0.77 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL172 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : 80a3b8b0-d9b4-11f1-43f3-c7afedfff7fc [observed]

 Occultation Date + Time   : 2026-10-21 at 03:47:51 UT +/- 0.0 min  [1]
 Object Designation        : (194) Prokne
 Orbit Class               : MBA
 Star Designation          : GDR3 3815979422025540992
 Star Coordinates (ICRF)   : RA = 10 54 00.6682, DE = +04 27 51.794  [2]
 Star Magnitudes           : G = 11.33 mag, RP = 10.83 mag, BP = 11.66 mag
 Object Magnitude          : V = 14.06 mag
 Estimated Magnitude Drop  : 2.8 mag
 Estimated Max. Duration   : 4.8 sec
 Object Mean Diameter      : 168.4 km  (src: astorb)
 Speed of the shadow       : 34.8 km/s
 Elongation to Moon & Sun  : 162° (sunlit = 73%), Sun = 45°
 Cross-track uncertainty   : 0.7 mas = 1 km = 0.01 path-width (1-sig)
 RUWE and duplicate source : 0.77 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL172
 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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