Cora»Occultation

2025-12-27 / HIP 24379 / (255) Oppavia

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Fausto Delucchi	O+	VIS	M150	CH	?	21:48:00	21:48:38.28	21:48:43.48	21:49:00	0.500	0.500	5.20	58.2
2	show	Alberto Ossola	O+	VID	M230	CH	GPS	21:48:04	21:48:37.86	21:48:42.72	21:49:21	0.020	0.020	4.86	54.4
3	show	Stefano Sposetti	O+	VID	M200	CH	GPS	21:46:50	21:48:38.18	21:48:41.04	21:51:30	0.020	0.020	2.86	32.0
4	show	Szabolcs Nyari	O+	VIS	M90	HU	?	21:45:20	21:47:26.2	21:47:31.6	21:47:50	0.200	0.200	5.40	60.5
5	show	Andrea Manna	O-	VID	M200	CH	GPS	21:45:23	::	::	21:50:07

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):

JPL80 : 5f19b520-d999-11f1-43f3-e3c1fdd9d368 [db: observed]

Using prediction 5f19b520-d999-11f1-43f3-e3c1fdd9d368 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:
Size = 68 x 31 km
a',b' = 33.9, 15.5 km
X0,Y0 = 113.4, 31.3 km
Mean diameter = 46 km

From 4 chords (VID,VIS)

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: 2025-12-27, 21:48 UT (JD = 2461037.408)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 4939	1.0	19.497	134°, 46°	2.45723e6	3807.4	0.0°	None	2020-10-05	not scaled	2019-10-23

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

Image size: 300px. Transparent image background for copy & paste

Map with groundtrack and observer stations

Event Details
Occultation UUID [and DB] : 5f19b520-d999-11f1-43f3-e3c1fdd9d368 [observed] Occultation Date + Time : 2025-12-27 at 21:48:10 UT +/- 0.01 min [1] Object Designation : (255) Oppavia Orbit Class : MBA Star Designation : GDR3 0187220240072120192 Star Coordinates (ICRF) : RA = 05 13 49.2626, DE = +37 01 56.676 [2] Star Magnitudes : G = 6.86 mag, RP = 6.84 mag, BP = 6.85 mag Object Magnitude : V = 14.43 mag Estimated Magnitude Drop : 7.6 mag Estimated Max. Duration : 5.1 sec Object Mean Diameter : 57.4 km (src: astorb) Speed of the shadow : 11.2 km/s Elongation to Moon & Sun : 73° (sunlit = 51%), Sun = 159° Cross-track uncertainty : 0.8 mas = 1 km = 0.02 path-width (1-sig) RUWE and duplicate source : 0.9 mas, dup.src = 1 (0:false, 1:true) Ephemeris Reference : JPL80 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : 5f19b520-d999-11f1-43f3-e3c1fdd9d368 [observed]

 Occultation Date + Time   : 2025-12-27 at 21:48:10 UT +/- 0.01 min  [1]
 Object Designation        : (255) Oppavia
 Orbit Class               : MBA
 Star Designation          : GDR3 0187220240072120192
 Star Coordinates (ICRF)   : RA = 05 13 49.2626, DE = +37 01 56.676  [2]
 Star Magnitudes           : G = 6.86 mag, RP = 6.84 mag, BP = 6.85 mag
 Object Magnitude          : V = 14.43 mag
 Estimated Magnitude Drop  : 7.6 mag
 Estimated Max. Duration   : 5.1 sec
 Object Mean Diameter      : 57.4 km  (src: astorb)
 Speed of the shadow       : 11.2 km/s
 Elongation to Moon & Sun  : 73° (sunlit = 51%), Sun = 159°
 Cross-track uncertainty   : 0.8 mas = 1 km = 0.02 path-width (1-sig)
 RUWE and duplicate source : 0.9 mas, dup.src = 1  (0:false, 1:true)

 Ephemeris Reference       : JPL80
 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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