Collaborative Occultation Resources and Archive (CORA)

2023-09-05 / UCAC4 400-124523 / (25307) 1998 XU77

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Gregor Krannich	O+	VID	M350	DE	GPS	20:38:25	20:39:53.300	20:39:54.740	20:41:25	0.16	0.16	1.44	7.3
2	show	Zdenek Moravec, Bohuslav Matouš	O+	CCD	T432	CZ	GPS	20:38:12	20:39:10.79	20:39:12.26	20:40:12	0.10	0.12	1.47	7.5
3	show	Zdenek Sikac	O-	VID	T150	CZ	NTP	20:37:01			20:41:00
4	show	Anna Marciniak	O-	CCD	M350	PL	GPS	20:37:45			20:39:49

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#48 : 1cb3a868-a424-4544-95e6-135d0ed8db2a [db: observed]

JPL#55 : 3bd5fb90-c33f-11ef-5276-07d27dd91b8f [db: observed]

Using prediction 1cb3a868-a424-4544-95e6-135d0ed8db2a 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 = 2411.6, 17.9 km
Circular diameter = 8 km

From 2 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.

Map with groundtrack and observer stations

Event Details
Occultation UUID [and DB] : 1cb3a868-a424-4544-95e6-135d0ed8db2a [observed] Occultation Date + Time : 2023-09-05 at 20:52:50 UT +/- 0.09 min [1] Object Designation : (25307) 1998 XU77 Orbit Class : MBA Star Designation : GDR3 4193462001733379328 Star Coordinates (ICRF) : RA = 19 49 11.3936, DE = -10 10 20.487 [2] Star Magnitudes : G = 13.74 mag, RP = 13.22 mag, BP = 14.08 mag Object Magnitude : V = 18.62 mag Estimated Magnitude Drop : 4.9 mag Estimated Max. Duration : 1.3 sec Object Mean Diameter : 6.8 km (src: astorb) Speed of the shadow : 5.1 km/s Elongation to Moon & Sun : 122° (sunlit = 61%), Sun = 133° Cross-track uncertainty : 4.0 mas = 6 km = 1.00 path-width (1-sig) RUWE and duplicate source : 1.01 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#48 [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : 1cb3a868-a424-4544-95e6-135d0ed8db2a [observed]

 Occultation Date + Time   : 2023-09-05 at 20:52:50 UT +/- 0.09 min  [1]
 Object Designation        : (25307) 1998 XU77
 Orbit Class               : MBA
 Star Designation          : GDR3 4193462001733379328
 Star Coordinates (ICRF)   : RA = 19 49 11.3936, DE = -10 10 20.487  [2]
 Star Magnitudes           : G = 13.74 mag, RP = 13.22 mag, BP = 14.08 mag
 Object Magnitude          : V = 18.62 mag
 Estimated Magnitude Drop  : 4.9 mag
 Estimated Max. Duration   : 1.3 sec
 Object Mean Diameter      : 6.8 km  (src: astorb)
 Speed of the shadow       : 5.1 km/s
 Elongation to Moon & Sun  : 122° (sunlit = 61%), Sun = 133°
 Cross-track uncertainty   : 4.0 mas = 6 km = 1.00 path-width (1-sig)
 RUWE and duplicate source : 1.01 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#48

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

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