Cora»Occultation

2025-10-28 / UCAC4 481-001273 / (1207) Ostenia

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Alberto Ossola	O+	VID	M230	CH	GPS	20:43:02	20:44:27.99	20:44:30.07	20:45:36	0.160	0.320	2.08	22.0
2	show	Andrea Manna	O+	VID	M200	CH	GPS	20:42:06	20:44:29.50	20:44:30.94	20:47:02	0.160	0.160	1.44	15.3
3	show	Stefano Sposetti	O-	VID	M420	CH	GPS	20:43:30	::	::	20:45:30

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

3 observations found in db: sodis

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

JPL#74 : a8382c60-ddb8-11f0-547e-6280cffffd47 [db: observed]

Using prediction a8382c60-ddb8-11f0-547e-6280cffffd47 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 = 367.4, 54.1 km
Circular diameter = 53 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).

Check SiMDA for size and mass data.

Check Johnston Archive for satellites.

Sky projection (artificial light) for occ. time: 2025-10-28, 20:44 UT (JD = 2460977.364)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 407	2.0	9.071	51°, -60°	2.442483e6	18494.4	0.0°	None	2017-04-03	not scaled	2017-03-31
# 408	2.0	9.071	183°, -63°	2.442483e6	18494.4	0.0°	None	2017-04-03	not scaled	2017-03-31

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] : a8382c60-ddb8-11f0-547e-6280cffffd47 [observed] Occultation Date + Time : 2025-10-28 at 20:43:10 UT +/- 0.01 min [1] Object Designation : (1207) Ostenia Orbit Class : MBA Star Designation : GDR3 2553382972577962624 Star Coordinates (ICRF) : RA = 00 52 41.2738, DE = +06 09 43.598 [2] Star Magnitudes : G = 13.11 mag, RP = 12.62 mag, BP = 13.42 mag Object Magnitude : V = 15.11 mag Estimated Magnitude Drop : 2.2 mag Estimated Max. Duration : 2.2 sec Object Mean Diameter : 22.9 km (src: astorb) Speed of the shadow : 10.6 km/s Elongation to Moon & Sun : 78° (sunlit = 42%), Sun = 159° Cross-track uncertainty : 1.8 mas = 2 km = 0.11 path-width (1-sig) RUWE and duplicate source : 3.27 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#74 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : a8382c60-ddb8-11f0-547e-6280cffffd47 [observed]

 Occultation Date + Time   : 2025-10-28 at 20:43:10 UT +/- 0.01 min  [1]
 Object Designation        : (1207) Ostenia
 Orbit Class               : MBA
 Star Designation          : GDR3 2553382972577962624
 Star Coordinates (ICRF)   : RA = 00 52 41.2738, DE = +06 09 43.598  [2]
 Star Magnitudes           : G = 13.11 mag, RP = 12.62 mag, BP = 13.42 mag
 Object Magnitude          : V = 15.11 mag
 Estimated Magnitude Drop  : 2.2 mag
 Estimated Max. Duration   : 2.2 sec
 Object Mean Diameter      : 22.9 km  (src: astorb)
 Speed of the shadow       : 10.6 km/s
 Elongation to Moon & Sun  : 78° (sunlit = 42%), Sun = 159°
 Cross-track uncertainty   : 1.8 mas = 2 km = 0.11 path-width (1-sig)
 RUWE and duplicate source : 3.27 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#74
 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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