Cora»Occultation

2025-12-29 / UCAC4 475-029825 / (219) Thusnelda

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Peter Delincak	O+	VID	M400	SK	NTP	02:16:11	02:18:20.109	02:18:21.964	02:19:28	0.015	0.015	1.85	23.1
2	show	Jiri Polak	O+	VID	M300	CZ	NTP	02:16:45	02:18:43.62	02:18:47.17	02:20:45	0.030	0.020	3.55	44.4
3	show	Michal Rottenborn	O+	VID	M254	CZ	GPS	02:17:46	02:18:43.710	02:18:47.130	02:19:47	0.050	0.050	3.42	42.8
4	show	Jiri Kubanek	O+	VID	M303	CZ	GPS	02:17:44	02:18:42.54	02:18:44.82	02:19:44	0.030	0.030	2.28	28.5
5	show	Roland BONINSEGNA	O+	VID	M400	BE	GPS	02:18:27	02:19:26.32	02:19:29.88	02:20:26	0.040	0.040	3.56	44.5
6	show	Robert Dequinze	O-	VID	M254	BE	GPS	02:19:00	::	::	02:20:06

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

6 observations found in db: sodis

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

JPL77 : 3ae39b00-d997-11f1-43f3-0ac4be6ad5eb [db: observed]

Using prediction 3ae39b00-d997-11f1-43f3-0ac4be6ad5eb 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 = 54 x 25 km
a',b' = 27.0, 12.3 km
X0,Y0 = -136.8, 12.9 km
Mean diameter = 36 km

From 5 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).

Check SiMDA for size and mass data.

Check Johnston Archive for satellites.

Sky projection (artificial light) for occ. time: 2025-12-29, 02:17 UT (JD = 2461038.595)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 4840	1.0	59.712	253°, -69°	2.457358e6	3680.6	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] : 3ae39b00-d997-11f1-43f3-0ac4be6ad5eb [observed] Occultation Date + Time : 2025-12-29 at 02:22:02 UT +/- 0.01 min [1] Object Designation : (219) Thusnelda Orbit Class : MBA Star Designation : GDR3 3152526782906734720 Star Coordinates (ICRF) : RA = 07 07 31.0704, DE = +04 59 20.170 [2] Star Magnitudes : G = 12.57 mag, RP = 12.09 mag, BP = 12.89 mag Object Magnitude : V = 12.91 mag Estimated Magnitude Drop : 0.9 mag Estimated Max. Duration : 3.3 sec Object Mean Diameter : 40.6 km (src: astorb) Speed of the shadow : 12.5 km/s Elongation to Moon & Sun : 85° (sunlit = 65%), Sun = 160° Cross-track uncertainty : 0.7 mas = 0 km = 0.02 path-width (1-sig) RUWE and duplicate source : 1.08 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL77 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : 3ae39b00-d997-11f1-43f3-0ac4be6ad5eb [observed]

 Occultation Date + Time   : 2025-12-29 at 02:22:02 UT +/- 0.01 min  [1]
 Object Designation        : (219) Thusnelda
 Orbit Class               : MBA
 Star Designation          : GDR3 3152526782906734720
 Star Coordinates (ICRF)   : RA = 07 07 31.0704, DE = +04 59 20.170  [2]
 Star Magnitudes           : G = 12.57 mag, RP = 12.09 mag, BP = 12.89 mag
 Object Magnitude          : V = 12.91 mag
 Estimated Magnitude Drop  : 0.9 mag
 Estimated Max. Duration   : 3.3 sec
 Object Mean Diameter      : 40.6 km  (src: astorb)
 Speed of the shadow       : 12.5 km/s
 Elongation to Moon & Sun  : 85° (sunlit = 65%), Sun = 160°
 Cross-track uncertainty   : 0.7 mas = 0 km = 0.02 path-width (1-sig)
 RUWE and duplicate source : 1.08 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL77
 Note                      : FP:true

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

More Data and Informations

SiMDA \| 3D Asteroid Catalogue \| Johnston Archive \| Star at CDS (Vizier) \| JPL Small-Body Node \| Minor Planet Center \| Wikipedia

(If error 404: link not valid which means no data available)

Aladin Sky Atlas
Loading sky atlas…
Aladin Lite direct link (has Gaia overlay)