Cora»Occultation

2026-09-01 / UCAC4 675-040644 / (1241) Dysona

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Stefano Sposetti	O+	VID	M420	CH	GPS	03:12:40	03:14:37.7	03:14:40.6	03:16:40	0.300	0.400	2.90	69.6
2	show	Björn Kattentidt	O+	VID	M280	DE	GPS	03:13:38	03:14:52.072	03:14:55.770	03:17:02	0.264	0.264	3.70	88.8
3	show	Zdenek Sikac	O+	VID	T150	CZ	GPS	03:14:00	03:14:59.1	03:15:02.4	03:16:02	0.600	0.600	3.30	79.2
4	show	Joachim Siegert	O-	VID	M279	DE	GPS	03:13:54	::	::	03:15:54

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

4 observations found in db: sodis

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

JPL83 : 42ce5a40-d9af-11f1-43f3-8fa46ed7ff52 [db: observed]

Using prediction 42ce5a40-d9af-11f1-43f3-8fa46ed7ff52 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 = 86 km

From 3 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.

Sky projection (artificial light) for occ. time: 2026-09-01, 03:14 UT (JD = 2461284.635)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 529	None	8.607	124°, -68°	2.451131e6	10153.6	0.0°	None	None	not scaled	2013-02-11
# 530	None	8.607	20°, -23°	2.451131e6	10153.6	0.0°	None	None	not scaled	2013-02-11

Q: model quality flag (0-5, 5=highest) | P: rotation period | λ,β: ecl. lon. and lat. of spin axis (J2000) | JD: initial time (epoch) | φ0: initial rotation angle for JD0

Image size: 300px. Transparent image background for copy & paste

Map with groundtrack and observer stations

Event Details
Occultation UUID [and DB] : 42ce5a40-d9af-11f1-43f3-8fa46ed7ff52 [observed] Occultation Date + Time : 2026-09-01 at 03:16:34 UT +/- 0.0 min [1] Object Designation : (1241) Dysona Orbit Class : MBA Star Designation : GDR3 0197265962416641408 Star Coordinates (ICRF) : RA = 05 42 11.0334, DE = +44 57 57.169 [2] Star Magnitudes : G = 15.21 mag, RP = 14.62 mag, BP = 15.61 mag Object Magnitude : V = 16.04 mag Estimated Magnitude Drop : 1.2 mag Estimated Max. Duration : 3.5 sec Object Mean Diameter : 83.0 km (src: astorb) Speed of the shadow : 24.0 km/s Elongation to Moon & Sun : 60° (sunlit = 83%), Sun = 73° Cross-track uncertainty : 0.7 mas = 1 km = 0.02 path-width (1-sig) RUWE and duplicate source : 0.97 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL83 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : 42ce5a40-d9af-11f1-43f3-8fa46ed7ff52 [observed]

 Occultation Date + Time   : 2026-09-01 at 03:16:34 UT +/- 0.0 min  [1]
 Object Designation        : (1241) Dysona
 Orbit Class               : MBA
 Star Designation          : GDR3 0197265962416641408
 Star Coordinates (ICRF)   : RA = 05 42 11.0334, DE = +44 57 57.169  [2]
 Star Magnitudes           : G = 15.21 mag, RP = 14.62 mag, BP = 15.61 mag
 Object Magnitude          : V = 16.04 mag
 Estimated Magnitude Drop  : 1.2 mag
 Estimated Max. Duration   : 3.5 sec
 Object Mean Diameter      : 83.0 km  (src: astorb)
 Speed of the shadow       : 24.0 km/s
 Elongation to Moon & Sun  : 60° (sunlit = 83%), Sun = 73°
 Cross-track uncertainty   : 0.7 mas = 1 km = 0.02 path-width (1-sig)
 RUWE and duplicate source : 0.97 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL83
 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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