Cora»Occultation

2026-10-12 / UCAC4 505-034233 / (3037) Alku

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Daniel Blazewicz	O+	VID	M350	PL	GPS	03:57:22	03:58:23.44	03:58:24.40	03:59:24	0.040	0.040	0.96	15.0
2	show	Wacław Pieczonka	O+	VID	M200	PL	GPS	03:57:33	03:58:31.49	03:58:32.49	03:59:31	0.130	0.130	1.00	15.6
3	show	Zdenek Sikac	O-	VID	T150	CZ	GPS	03:56:53	::	::	03:58:54

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

3 observations found in db: sodis

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

JPL69 : 80813200-d9b3-11f1-43f3-d8639fa7ce92 [db: observed]

Using prediction 80813200-d9b3-11f1-43f3-d8639fa7ce92 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 = 64.4, 20.5 km
Circular diameter = 16 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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Map with groundtrack and observer stations

Event Details
Occultation UUID [and DB] : 80813200-d9b3-11f1-43f3-d8639fa7ce92 [observed] Occultation Date + Time : 2026-10-12 at 03:58:34 UT +/- 0.0 min [1] Object Designation : (3037) Alku Orbit Class : MBA Star Designation : GDR3 3159041462319738880 Star Coordinates (ICRF) : RA = 06 55 43.9638, DE = +10 49 49.193 [2] Star Magnitudes : G = 12.83 mag, RP = 12.17 mag, BP = 13.34 mag Object Magnitude : V = 16.04 mag Estimated Magnitude Drop : 3.3 mag Estimated Max. Duration : 1.2 sec Object Mean Diameter : 18.9 km (src: astorb) Speed of the shadow : 15.6 km/s Elongation to Moon & Sun : 111° (sunlit = 2%), Sun = 95° Cross-track uncertainty : 0.7 mas = 0 km = 0.05 path-width (1-sig) RUWE and duplicate source : 1.03 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL69 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : 80813200-d9b3-11f1-43f3-d8639fa7ce92 [observed]

 Occultation Date + Time   : 2026-10-12 at 03:58:34 UT +/- 0.0 min  [1]
 Object Designation        : (3037) Alku
 Orbit Class               : MBA
 Star Designation          : GDR3 3159041462319738880
 Star Coordinates (ICRF)   : RA = 06 55 43.9638, DE = +10 49 49.193  [2]
 Star Magnitudes           : G = 12.83 mag, RP = 12.17 mag, BP = 13.34 mag
 Object Magnitude          : V = 16.04 mag
 Estimated Magnitude Drop  : 3.3 mag
 Estimated Max. Duration   : 1.2 sec
 Object Mean Diameter      : 18.9 km  (src: astorb)
 Speed of the shadow       : 15.6 km/s
 Elongation to Moon & Sun  : 111° (sunlit = 2%), Sun = 95°
 Cross-track uncertainty   : 0.7 mas = 0 km = 0.05 path-width (1-sig)
 RUWE and duplicate source : 1.03 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL69
 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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