Cora»Occultation

2026-09-15 / UCAC4 312-126477 / (160) Una

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Andreas Schweizer, Stefan Meister	O+	VID	M250	CH	GPS	18:58:48	18:59:45.346	18:59:50.146	19:00:48	0.165	0.165	4.80	64.3
2	show	Stefan Meister, Andreas Schweizer	O+	VID	M500	CH	GPS	18:59:26	18:59:45.438	18:59:50.737	19:00:11	0.073	0.073	5.30	71.0
3	show	Tomas Janik	O+	CCD	T600	CZ	GPS	18:59:11	19:00:06.4	19:00:07.6	19:01:00	0.300	0.300	1.20	16.1
4	show	Anna Marciniak	O-	CCD	M400	PL	GPS	18:57:15	::	::	19:03:31

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):

JPL75 : 04ab25c0-d9b1-11f1-43f3-31e1cbe55503 [db: observed]

Using prediction 04ab25c0-d9b1-11f1-43f3-31e1cbe55503 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 = 81 x 49 km
a',b' = 40.7, 24.5 km
X0,Y0 = 755.3, -2.6 km
Mean diameter = 63 km

From 3 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: 2026-09-15, 18:59 UT (JD = 2461299.291)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 169	None	11.033	125°, -33°	2.445254e6	16045.3	0.0°	None	2010-04-15	not scaled	2009-05-29
# 170	None	11.033	308°, -41°	2.445254e6	16045.3	0.0°	None	2010-04-15	not scaled	2009-05-29

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] : 04ab25c0-d9b1-11f1-43f3-31e1cbe55503 [observed] Occultation Date + Time : 2026-09-15 at 18:57:01 UT +/- 0.01 min [1] Object Designation : (160) Una Orbit Class : MBA Star Designation : GDR3 4063501273595217536 Star Coordinates (ICRF) : RA = 17 53 27.9741, DE = -27 36 24.320 [2] Star Magnitudes : G = 13.99 mag, RP = 12.83 mag, BP = 15.45 mag Object Magnitude : V = 14.41 mag Estimated Magnitude Drop : 1.0 mag Estimated Max. Duration : 6.1 sec Object Mean Diameter : 81.2 km (src: astorb) Speed of the shadow : 13.4 km/s Elongation to Moon & Sun : 40° (sunlit = 22%), Sun = 96° Cross-track uncertainty : 0.4 mas = 0 km = 0.01 path-width (1-sig) RUWE and duplicate source : 0.85 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL75 Note : FP:true Object is a "TNOs are cool" target ! [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : 04ab25c0-d9b1-11f1-43f3-31e1cbe55503 [observed]

 Occultation Date + Time   : 2026-09-15 at 18:57:01 UT +/- 0.01 min  [1]
 Object Designation        : (160) Una
 Orbit Class               : MBA
 Star Designation          : GDR3 4063501273595217536
 Star Coordinates (ICRF)   : RA = 17 53 27.9741, DE = -27 36 24.320  [2]
 Star Magnitudes           : G = 13.99 mag, RP = 12.83 mag, BP = 15.45 mag
 Object Magnitude          : V = 14.41 mag
 Estimated Magnitude Drop  : 1.0 mag
 Estimated Max. Duration   : 6.1 sec
 Object Mean Diameter      : 81.2 km  (src: astorb)
 Speed of the shadow       : 13.4 km/s
 Elongation to Moon & Sun  : 40° (sunlit = 22%), Sun = 96°
 Cross-track uncertainty   : 0.4 mas = 0 km = 0.01 path-width (1-sig)
 RUWE and duplicate source : 0.85 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL75
 Note                      : FP:true

 Object is a "TNOs are cool" target !

 [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

More Data and Informations

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