2025-09-06 / UCAC4 424-073382 / (183) Istria

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Malcolm Jennings	O+	VID	M276	GB	GPS	20:07:00	20:09:33.70	20:09:35.30	20:11:00	0.523	0.523	1.60	22.9
2	show	Simon Kidd	O+	VID	M350	GB	GPS	20:08:45	20:09:30.93	20:09:32.35	20:10:15	0.040	0.040	1.42	20.3
3	show	Simon Kidd	O+	VID	M350	GB	GPS	20:08:45	20:09:33.34	20:09:35.64	20:10:15	0.070	0.070	2.30	32.9
4	show	Gerard VAUDESCAL	O-	VID	T250	FR	GPS	20:09:12	::	::	20:11:19
5	show	Jean jacques Castellani	O-	VID	M400	FR	GPS	20:09:56	::	::	20:10:33

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

5 observations found in db: sodis

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

JPL#83 : 68a9fd90-ddb7-11f0-547e-8c22ebfffcb1 [db: observed]

Using prediction 68a9fd90-ddb7-11f0-547e-8c22ebfffcb1 for map and profile fit

Ellipse and circular profile fits to the timings (chords)

Auto-Fit Result: Ellipse profile fit was not successful. Trying circular fit. Circular profile fit was not successful ... Chords to ignore: Fill: Grid: Show (close) miss chords: 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: 2025-09-06, 20:08 UT (JD = 2460925.339)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 669	None	11.769	85°, 20°	2.444112e6	16813.3	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

Map with groundtrack and observer stations

Event Details

Occultation UUID [and DB] : 68a9fd90-ddb7-11f0-547e-8c22ebfffcb1 [observed] Occultation Date + Time : 2025-09-06 at 20:14:34 UT +/- 0.01 min [1] Object Designation : (183) Istria Orbit Class : MBA Star Designation : GDR3 4175325351277172864 Star Coordinates (ICRF) : RA = 17 49 45.7870, DE = -05 15 31.471 [2] Star Magnitudes : G = 13.8 mag, RP = 12.96 mag, BP = 14.53 mag Object Magnitude : V = 14.93 mag Estimated Magnitude Drop : 1.5 mag Estimated Max. Duration : 2.5 sec Object Mean Diameter : 35.4 km (src: astorb) Speed of the shadow : 14.3 km/s Elongation to Moon & Sun : 67° (sunlit = 99%), Sun = 102° Cross-track uncertainty : 1.0 mas = 1 km = 0.05 path-width (1-sig) RUWE and duplicate source : 1.07 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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