Collaborative Occultation Resources and Archive (CORA)

2023-12-18 / UCAC4 598-042472 / (2260) Neoptolemus

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Martin Gutekunst	O+	CCD	L280	DE	GPS	02:25:56	02:26:35.388	02:26:39.439	02:26:56	0.05	0.05	4.05	61.6
2	show	Gregor Krannich	O+	VID	M350	DE	GPS	02:25:10	02:26:37.502	02:26:42.371	02:28:21	0.143	0.143	4.87	74.0
3	show	Roland BONINSEGNA	O-	VID	M400	BE	GPS	2:26:11.			2:28:11.
4	show	Olivier Schreurs, Manon Lecossois	O-	VID	M410	BE	GPS	02:26:07			02:28:08

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):

JPL#62 : d1eeb99e-3352-40d9-80a5-2b77f6cc3a62 [db: observed]

JPL#68 : 0f648070-c341-11ef-5276-48ebcb9f7e60 [db: observed]

Using prediction d1eeb99e-3352-40d9-80a5-2b77f6cc3a62 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 = -1385.4, 47.1 km
Circular diameter = 106 km

From 2 chords (VID,CCD)

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] : d1eeb99e-3352-40d9-80a5-2b77f6cc3a62 [observed] Occultation Date + Time : 2023-12-18 at 02:26:33 UT +/- 0.08 min [1] Object Designation : (2260) Neoptolemus Orbit Class : JTRO Star Designation : GDR3 0878852086603897856 Star Coordinates (ICRF) : RA = 07 45 51.7961, DE = +29 24 32.001 [2] Star Magnitudes : G = 14.37 mag, RP = 13.97 mag, BP = 14.6 mag Object Magnitude : V = 16.49 mag Estimated Magnitude Drop : 2.3 mag Estimated Max. Duration : 4.7 sec Object Mean Diameter : 71.7 km (src: astorb) Speed of the shadow : 15.2 km/s Elongation to Moon & Sun : 139° (sunlit = 31%), Sun = 152° Cross-track uncertainty : 2.0 mas = 6 km = 0.08 path-width (1-sig) RUWE and duplicate source : 0.95 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#62 [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : d1eeb99e-3352-40d9-80a5-2b77f6cc3a62 [observed]

 Occultation Date + Time   : 2023-12-18 at 02:26:33 UT +/- 0.08 min  [1]
 Object Designation        : (2260) Neoptolemus
 Orbit Class               : JTRO
 Star Designation          : GDR3 0878852086603897856
 Star Coordinates (ICRF)   : RA = 07 45 51.7961, DE = +29 24 32.001  [2]
 Star Magnitudes           : G = 14.37 mag, RP = 13.97 mag, BP = 14.6 mag
 Object Magnitude          : V = 16.49 mag
 Estimated Magnitude Drop  : 2.3 mag
 Estimated Max. Duration   : 4.7 sec
 Object Mean Diameter      : 71.7 km  (src: astorb)
 Speed of the shadow       : 15.2 km/s
 Elongation to Moon & Sun  : 139° (sunlit = 31%), Sun = 152°
 Cross-track uncertainty   : 2.0 mas = 6 km = 0.08 path-width (1-sig)
 RUWE and duplicate source : 0.95 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#62

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

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