Cora»Occultation

2025-11-17 / UCAC4 532-011646 / (410) Chloris

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Simon Kidd	O+	VID	M350	GB	GPS	04:39:30	04:40:22.75	04:40:31.59	04:41:30	0.040	0.040	8.84	123.8
2	show	William Stewart	O+	VID	M279	GB	GPS	04:39:42	04:40:37.92	04:40:44.48	04:41:41	0.160	0.160	6.56	91.8

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#92 : bcdb8770-ddb8-11f0-547e-4e52fdff0d7b [db: observed]

Using prediction bcdb8770-ddb8-11f0-547e-4e52fdff0d7b 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 = -92.5, 9.8 km
Circular diameter = 128 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: 2025-11-17, 04:40 UT (JD = 2460996.694)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 4057	1.0	32.996	81°, 1°	2.451081e6	9915.7	0.0°	None	2019-09-26	not scaled	2019-05-07
# 4058	1.0	32.996	261°, -1°	2.451081e6	9915.7	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] : bcdb8770-ddb8-11f0-547e-4e52fdff0d7b [observed] Occultation Date + Time : 2025-11-17 at 04:43:52 UT +/- 0.01 min [1] Object Designation : (410) Chloris Orbit Class : MBA Star Designation : GDR3 3394631825934886272 Star Coordinates (ICRF) : RA = 05 10 53.2486, DE = +16 17 56.156 [2] Star Magnitudes : G = 13.55 mag, RP = 12.72 mag, BP = 14.28 mag Object Magnitude : V = 13.46 mag Estimated Magnitude Drop : 0.7 mag Estimated Max. Duration : 8.8 sec Object Mean Diameter : 123.5 km (src: astorb) Speed of the shadow : 14.0 km/s Elongation to Moon & Sun : 123° (sunlit = 8%), Sun = 156° Cross-track uncertainty : 1.0 mas = 1 km = 0.01 path-width (1-sig) RUWE and duplicate source : 0.93 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#92 Note : FP:true Object is a Gaia mass determination target ! [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : bcdb8770-ddb8-11f0-547e-4e52fdff0d7b [observed]

 Occultation Date + Time   : 2025-11-17 at 04:43:52 UT +/- 0.01 min  [1]
 Object Designation        : (410) Chloris
 Orbit Class               : MBA
 Star Designation          : GDR3 3394631825934886272
 Star Coordinates (ICRF)   : RA = 05 10 53.2486, DE = +16 17 56.156  [2]
 Star Magnitudes           : G = 13.55 mag, RP = 12.72 mag, BP = 14.28 mag
 Object Magnitude          : V = 13.46 mag
 Estimated Magnitude Drop  : 0.7 mag
 Estimated Max. Duration   : 8.8 sec
 Object Mean Diameter      : 123.5 km  (src: astorb)
 Speed of the shadow       : 14.0 km/s
 Elongation to Moon & Sun  : 123° (sunlit = 8%), Sun = 156°
 Cross-track uncertainty   : 1.0 mas = 1 km = 0.01 path-width (1-sig)
 RUWE and duplicate source : 0.93 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#92
 Note                      : FP:true

 Object is a Gaia mass determination target !

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

More Data and Informations

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