Cora»Occultation

2025-11-23 / UCAC4 623-014076 / (8984) Derevyanko

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Jiri Polak	O+	VID	M300	CZ	NTP	16:53:17	16:55:17.60	16:55:17.90	16:57:17	0.050	0.050	0.30	3.7
2	show	Michal Rottenborn	O+	VID	M254	CZ	GPS	16:54:17	16:55:17.490	16:55:17.820	16:56:18	0.050	0.080	0.33	4.1

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

2 observations found in db: sodis

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

JPL#66 : c3656b10-ddb8-11f0-547e-9902fafb7a1c [db: observed]

Using prediction c3656b10-ddb8-11f0-547e-9902fafb7a1c 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 = 370.4, 26.9 km
Circular diameter = 5 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] : c3656b10-ddb8-11f0-547e-9902fafb7a1c [observed] Occultation Date + Time : 2025-11-23 at 16:50:12 UT +/- 0.0 min [1] Object Designation : (8984) Derevyanko Orbit Class : MBA Star Designation : GDR3 0218668402929306624 Star Coordinates (ICRF) : RA = 03 57 11.6402, DE = +34 26 46.426 [2] Star Magnitudes : G = 13.85 mag, RP = 13.22 mag, BP = 14.32 mag Object Magnitude : V = 16.97 mag Estimated Magnitude Drop : 3.2 mag Estimated Max. Duration : 0.6 sec Object Mean Diameter : 7.2 km (src: astorb) Speed of the shadow : 12.3 km/s Elongation to Moon & Sun : 145° (sunlit = 10%), Sun = 166° Cross-track uncertainty : 0.7 mas = 0 km = 0.11 path-width (1-sig) RUWE and duplicate source : 0.96 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#66 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

Occultation UUID [and DB] : c3656b10-ddb8-11f0-547e-9902fafb7a1c [observed] Occultation Date + Time : 2025-11-23 at 16:50:12 UT +/- 0.0 min [1] Object Designation : (8984) Derevyanko Orbit Class : MBA Star Designation : GDR3 0218668402929306624 Star Coordinates (ICRF) : RA = 03 57 11.6402, DE = +34 26 46.426 [2] Star Magnitudes : G = 13.85 mag, RP = 13.22 mag, BP = 14.32 mag Object Magnitude : V = 16.97 mag Estimated Magnitude Drop : 3.2 mag Estimated Max. Duration : 0.6 sec Object Mean Diameter : 7.2 km (src: astorb) Speed of the shadow : 12.3 km/s Elongation to Moon & Sun : 145° (sunlit = 10%), Sun = 166° Cross-track uncertainty : 0.7 mas = 0 km = 0.11 path-width (1-sig) RUWE and duplicate source : 0.96 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#66 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

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