Cora»Occultation

2026-04-17 / UCAC4 383-065030 / (309) Fraternitas

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Antonio Catapano	O+	VID	T500	IT	GPS	21:15:06	21:16:03.1	21:16:06.2	21:17:02	0.300	0.200	3.10	36.6
2	show	Alfonso Noschese	O+	VID	M450	IT	GPS	21:15:22	21:16:01.2	21:16:02.9	21:16:50	0.200	0.300	1.70	20.1
3	show	Ettore Marmo	O-	VID	M300	IT	GPS	21:14:41	::	::	21:18:11

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#88 : 8dc56800-33c3-11f1-6999-12477f7fbd1a [db: asteroids]

Using prediction 8dc56800-33c3-11f1-6999-12477f7fbd1a 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 = -1214.9, 23.7 km
Circular diameter = 43 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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Check Johnston Archive for satellites.

Map with groundtrack and observer stations

Event Details
Occultation UUID [and DB] : 8dc56800-33c3-11f1-6999-12477f7fbd1a [asteroids] Occultation Date + Time : 2026-04-17 at 21:11:17 UT +/- 0.0 min [1] Object Designation : (309) Fraternitas Orbit Class : MBA Star Designation : GDR3 3607175807359584512 Star Coordinates (ICRF) : RA = 13 37 09.6354, DE = -13 24 16.918 [2] Star Magnitudes : G = 14.56 mag, RP = 14.09 mag, BP = 14.85 mag Object Magnitude : V = 14.08 mag Estimated Magnitude Drop : 0.5 mag Estimated Max. Duration : 3.9 sec Object Mean Diameter : 45.3 km (src: astorb) Speed of the shadow : 11.8 km/s Elongation to Moon & Sun : 174° (sunlit = 0%), Sun = 177° Cross-track uncertainty : 1.0 mas = 1 km = 0.03 path-width (1-sig) RUWE and duplicate source : 0.91 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#88 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : 8dc56800-33c3-11f1-6999-12477f7fbd1a [asteroids]

 Occultation Date + Time   : 2026-04-17 at 21:11:17 UT +/- 0.0 min  [1]
 Object Designation        : (309) Fraternitas
 Orbit Class               : MBA
 Star Designation          : GDR3 3607175807359584512
 Star Coordinates (ICRF)   : RA = 13 37 09.6354, DE = -13 24 16.918  [2]
 Star Magnitudes           : G = 14.56 mag, RP = 14.09 mag, BP = 14.85 mag
 Object Magnitude          : V = 14.08 mag
 Estimated Magnitude Drop  : 0.5 mag
 Estimated Max. Duration   : 3.9 sec
 Object Mean Diameter      : 45.3 km  (src: astorb)
 Speed of the shadow       : 11.8 km/s
 Elongation to Moon & Sun  : 174° (sunlit = 0%), Sun = 177°
 Cross-track uncertainty   : 1.0 mas = 1 km = 0.03 path-width (1-sig)
 RUWE and duplicate source : 0.91 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#88
 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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