Cora»Occultation

2026-04-01 / UCAC4 526-039779 / (583) Klotilde

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Marcin Górko	O+	VID	L152	PL	GPS	18:52:49	18:58:17.55	18:58:23.05	18:53:49	0.100	0.100	5.50	77.5
2	show	Piotr Walczak	O+	VID	M130	PL	GPS	18:57:16	18:58:16.98	18:58:21.98	18:59:21	0.130	0.130	5.00	70.5
3	show	Marek Zawilski, Mieczyslaw Borkowski	O+	VID	M200	PL	GPS	18:57:33	18:58:15.20	18:58:18.68	18:58:54	0.050	0.080	3.48	49.1
4	show	Konrad Guhl	O+	CCD	L100	DE	GPS	18:57:04	18:57:50.86	18:57:56.42	18:58:35	0.130	0.190	5.56	78.4
5	show	Sven Andersson	O+	VID	M360	DE	GPS	18:57:21	18:57:49.353	18:57:54.402	18:58:21	0.033	0.033	5.05	71.2
6	show	Henk de Groot	O+	VID	M350	NL	GPS	18:56:19	18:57:15.115	18:57:20.008	18:58:07	0.010	0.015	4.89	68.9
7	show	Anna Marciniak	O-	CCD	M350	PL	NTP	18:57:06	::	::	18:59:06

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

7 observations found in db: sodis

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

JPL#83 : c8f76f00-33cc-11f1-6999-e61f5c7ebbc9 [db: asteroids]

Using prediction c8f76f00-33cc-11f1-6999-e61f5c7ebbc9 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 = 92 x 69 km
a',b' = 46.2, 34.6 km
X0,Y0 = -212.6, 20.2 km
Mean diameter = 80 km

From 6 chords (CCD,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: 2026-04-01, 18:57 UT (JD = 2461132.290)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 5588	1.0	9.214	150°, 40°	2.457417e6	3715.3	0.0°	None	2020-10-05	not scaled	2019-10-23
# 5589	1.0	9.214	327°, 54°	2.457417e6	3715.3	0.0°	None	2020-10-05	not scaled	2019-10-23

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] : c8f76f00-33cc-11f1-6999-e61f5c7ebbc9 [asteroids] Occultation Date + Time : 2026-04-01 at 18:56:31 UT +/- 0.01 min [1] Object Designation : (583) Klotilde Orbit Class : MBA Star Designation : GDR3 3167662866133672320 Star Coordinates (ICRF) : RA = 07 12 13.2427, DE = +15 04 58.569 [2] Star Magnitudes : G = 11.63 mag, RP = 10.74 mag, BP = 12.46 mag Object Magnitude : V = 14.42 mag Estimated Magnitude Drop : 2.9 mag Estimated Max. Duration : 5.8 sec Object Mean Diameter : 81.6 km (src: astorb) Speed of the shadow : 14.1 km/s Elongation to Moon & Sun : 81° (sunlit = 100%), Sun = 95° Cross-track uncertainty : 1.3 mas = 2 km = 0.03 path-width (1-sig) RUWE and duplicate source : 1.09 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#83 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : c8f76f00-33cc-11f1-6999-e61f5c7ebbc9 [asteroids]

 Occultation Date + Time   : 2026-04-01 at 18:56:31 UT +/- 0.01 min  [1]
 Object Designation        : (583) Klotilde
 Orbit Class               : MBA
 Star Designation          : GDR3 3167662866133672320
 Star Coordinates (ICRF)   : RA = 07 12 13.2427, DE = +15 04 58.569  [2]
 Star Magnitudes           : G = 11.63 mag, RP = 10.74 mag, BP = 12.46 mag
 Object Magnitude          : V = 14.42 mag
 Estimated Magnitude Drop  : 2.9 mag
 Estimated Max. Duration   : 5.8 sec
 Object Mean Diameter      : 81.6 km  (src: astorb)
 Speed of the shadow       : 14.1 km/s
 Elongation to Moon & Sun  : 81° (sunlit = 100%), Sun = 95°
 Cross-track uncertainty   : 1.3 mas = 2 km = 0.03 path-width (1-sig)
 RUWE and duplicate source : 1.09 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#83
 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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