Cora»Occultation

2025-10-27 / UCAC4 530-010865 / (1054) Forsytia

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	ALBERTO LATINI, Francesco Fumagalli	O+	VID	M400	CH	GPS	21:49:35	21:50:04.12	21:50:16.21	21:51:30	0.090	0.140	12.09	60.5
2	show	Alberto Ossola	O+	VID	M230	CH	GPS	21:48:30	21:50:03.94	21:50:16.62	21:51:10	0.080	0.120	12.68	63.4
3	show	Andrea Manna, Michele Manna	O+	VID	M200	CH	GPS	21:46:51	21:50:03.19	21:50:09.1	21:52:40	0.160	0.200	5.91	29.6
4	show	Stefano Sposetti	O+	VID	M420	CH	GPS	21:49:47	21:50:05.74	21:50:06.64	21:50:50	0.050	0.050	0.90	4.5

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#77 : b3463890-ddb8-11f0-547e-d703ebfd39a0 [db: observed]

Using prediction b3463890-ddb8-11f0-547e-d703ebfd39a0 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 = 72 x 33 km
a',b' = 35.8, 16.4 km
X0,Y0 = -709.3, 23.4 km
Mean diameter = 48 km

From 4 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: 2025-10-27, 21:49 UT (JD = 2460976.409)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 3611	1.0	7.650	187°, 61°	2.450896e6	10080.4	0.0°	None	2019-09-26	not scaled	2019-05-07

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] : b3463890-ddb8-11f0-547e-d703ebfd39a0 [observed] Occultation Date + Time : 2025-10-27 at 21:34:15 UT +/- 0.01 min [1] Object Designation : (1054) Forsytia Orbit Class : MBA Star Designation : GDR3 3393299836318533120 Star Coordinates (ICRF) : RA = 05 01 20.7270, DE = +15 59 46.005 [2] Star Magnitudes : G = 11.56 mag, RP = 10.79 mag, BP = 12.22 mag Object Magnitude : V = 14.7 mag Estimated Magnitude Drop : 3.2 mag Estimated Max. Duration : 9.1 sec Object Mean Diameter : 45.5 km (src: astorb) Speed of the shadow : 5.0 km/s Elongation to Moon & Sun : 149° (sunlit = 33%), Sun = 138° Cross-track uncertainty : 1.0 mas = 1 km = 0.03 path-width (1-sig) RUWE and duplicate source : 1.39 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#77 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : b3463890-ddb8-11f0-547e-d703ebfd39a0 [observed]

 Occultation Date + Time   : 2025-10-27 at 21:34:15 UT +/- 0.01 min  [1]
 Object Designation        : (1054) Forsytia
 Orbit Class               : MBA
 Star Designation          : GDR3 3393299836318533120
 Star Coordinates (ICRF)   : RA = 05 01 20.7270, DE = +15 59 46.005  [2]
 Star Magnitudes           : G = 11.56 mag, RP = 10.79 mag, BP = 12.22 mag
 Object Magnitude          : V = 14.7 mag
 Estimated Magnitude Drop  : 3.2 mag
 Estimated Max. Duration   : 9.1 sec
 Object Mean Diameter      : 45.5 km  (src: astorb)
 Speed of the shadow       : 5.0 km/s
 Elongation to Moon & Sun  : 149° (sunlit = 33%), Sun = 138°
 Cross-track uncertainty   : 1.0 mas = 1 km = 0.03 path-width (1-sig)
 RUWE and duplicate source : 1.39 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#77
 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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