Cora»Occultation

2025-09-12 / UCAC4 369-077497 / (8512) 1991 PC11

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Deborah Smith, Eric Smith	O+	VID	M150	ES	GPS	20:34:31	20:36:32.367	20:36:33.002	20:38:31	0.061	0.061	0.63	12.7
2	show	Deborah Smith	O+	VID	M300	ES	GPS	20:34:31	20:36:31.686	20:36:32.483	20:38:31	0.031	0.031	0.80	16.2
3	show	Deborah Smith	O-	VID	M200	ES	GPS	20:34:29	::	::	20:38:29

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):

JPL#62 : 6bbc1f90-ddb7-11f0-547e-28b6aff51750 [db: observed]

Using prediction 6bbc1f90-ddb7-11f0-547e-28b6aff51750 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 = -1776.8, 10.8 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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Check Johnston Archive for satellites.

Map with groundtrack and observer stations

Event Details
Occultation UUID [and DB] : 6bbc1f90-ddb7-11f0-547e-28b6aff51750 [observed] Occultation Date + Time : 2025-09-12 at 20:34:47 UT +/- 0.0 min [1] Object Designation : (8512) 1991 PC11 Orbit Class : MBA Star Designation : GDR3 4325768125689157120 Star Coordinates (ICRF) : RA = 16 41 48.8655, DE = -16 15 50.786 [2] Star Magnitudes : G = 13.26 mag, RP = 12.59 mag, BP = 13.77 mag Object Magnitude : V = 18.68 mag Estimated Magnitude Drop : 5.4 mag Estimated Max. Duration : 0.4 sec Object Mean Diameter : 8.0 km (src: astorb) Speed of the shadow : 20.2 km/s Elongation to Moon & Sun : 164° (sunlit = 68%), Sun = 81° Cross-track uncertainty : 0.3 mas = 0 km = 0.08 path-width (1-sig) RUWE and duplicate source : 0.95 mas, dup.src = 1 (0:false, 1:true) Ephemeris Reference : JPL#62 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

Occultation UUID [and DB] : 6bbc1f90-ddb7-11f0-547e-28b6aff51750 [observed] Occultation Date + Time : 2025-09-12 at 20:34:47 UT +/- 0.0 min [1] Object Designation : (8512) 1991 PC11 Orbit Class : MBA Star Designation : GDR3 4325768125689157120 Star Coordinates (ICRF) : RA = 16 41 48.8655, DE = -16 15 50.786 [2] Star Magnitudes : G = 13.26 mag, RP = 12.59 mag, BP = 13.77 mag Object Magnitude : V = 18.68 mag Estimated Magnitude Drop : 5.4 mag Estimated Max. Duration : 0.4 sec Object Mean Diameter : 8.0 km (src: astorb) Speed of the shadow : 20.2 km/s Elongation to Moon & Sun : 164° (sunlit = 68%), Sun = 81° Cross-track uncertainty : 0.3 mas = 0 km = 0.08 path-width (1-sig) RUWE and duplicate source : 0.95 mas, dup.src = 1 (0:false, 1:true) Ephemeris Reference : JPL#62 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

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