Cora»Occultation

2025-09-02 / UCAC4 595-108639 / (5222) Ioffe

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Javier Prat, Pedro Martorell	O+	CCD	M310	ES	GPS	23:47:34	23:49:33.29	23:49:34.33	23:51:35	0.170	0.170	1.04	14.9
2	show	Michal Rottenborn	O+	VID	M254	CZ	GPS	23:47:14	23:48:13.540	23:48:14.690	23:49:14	0.050	0.050	1.15	16.4

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

2 observations found in db: sodis

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

JPL#70 : 640a5dc0-ddb7-11f0-547e-ee9ffb7c4ef0 [db: observed]

Using prediction 640a5dc0-ddb7-11f0-547e-ee9ffb7c4ef0 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 = -1366.9, 37.9 km
Circular diameter = 19 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.

Sky projection (artificial light) for occ. time: 2025-09-02, 23:48 UT (JD = 2460921.492)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 5505	1.0	9.739	280°, -12°	2.45723e6	3691.5	0.0°	None	2020-10-05	not scaled	2019-10-23
# 5506	1.0	9.739	54°, -52°	2.45723e6	3691.5	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] : 640a5dc0-ddb7-11f0-547e-ee9ffb7c4ef0 [observed] Occultation Date + Time : 2025-09-02 at 23:52:53 UT +/- 0.01 min [1] Object Designation : (5222) Ioffe Orbit Class : MBA Star Designation : GDR3 1837334786736700544 Star Coordinates (ICRF) : RA = 20 14 56.4852, DE = +28 50 08.122 [2] Star Magnitudes : G = 13.47 mag, RP = 12.53 mag, BP = 14.38 mag Object Magnitude : V = 16.58 mag Estimated Magnitude Drop : 3.2 mag Estimated Max. Duration : 1.5 sec Object Mean Diameter : 22.0 km (src: astorb) Speed of the shadow : 14.3 km/s Elongation to Moon & Sun : 60° (sunlit = 75%), Sun = 128° Cross-track uncertainty : 0.7 mas = 1 km = 0.05 path-width (1-sig) RUWE and duplicate source : 1.02 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#70 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : 640a5dc0-ddb7-11f0-547e-ee9ffb7c4ef0 [observed]

 Occultation Date + Time   : 2025-09-02 at 23:52:53 UT +/- 0.01 min  [1]
 Object Designation        : (5222) Ioffe
 Orbit Class               : MBA
 Star Designation          : GDR3 1837334786736700544
 Star Coordinates (ICRF)   : RA = 20 14 56.4852, DE = +28 50 08.122  [2]
 Star Magnitudes           : G = 13.47 mag, RP = 12.53 mag, BP = 14.38 mag
 Object Magnitude          : V = 16.58 mag
 Estimated Magnitude Drop  : 3.2 mag
 Estimated Max. Duration   : 1.5 sec
 Object Mean Diameter      : 22.0 km  (src: astorb)
 Speed of the shadow       : 14.3 km/s
 Elongation to Moon & Sun  : 60° (sunlit = 75%), Sun = 128°
 Cross-track uncertainty   : 0.7 mas = 1 km = 0.05 path-width (1-sig)
 RUWE and duplicate source : 1.02 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#70
 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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