Cora»Occultation

2025-11-28 / UCAC4 532-010625 / (410) Chloris

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Jiri Polak	O+	VID	M300	CZ	NTP	04:42:17	04:44:14.90	04:44:21.197	04:46:17	0.020	0.014	6.30	100.2
2	show	Jiri Polak	O+	VID	M300	CZ	NTP	04:42:17	04:44:14.57	04:44:20.62	04:46:17	0.040	0.040	6.05	96.2
3	show	Jiri Kubanek	O+	VID	M303	CZ	GPS	04:43:17	04:44:14.63	04:44:21.16	04:45:17	0.040	0.030	6.53	103.8
4	show	Jiri Kubanek	O+	VID	M303	CZ	GPS	04:43:17	04:44:14.77	04:44:21.76	04:45:17	0.020	0.070	6.99	111.1
5	show	Tomas Janik	O+	CCD	T600	CZ	GPS	04:43:24	04:44:21.21	04:44:24.22	04:45:21	0.150	0.150	3.01	47.9

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

5 observations found in db: sodis

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

JPL#92 : cd7d0950-ddb8-11f0-547e-a52fdf27489e [db: observed]

Using prediction cd7d0950-ddb8-11f0-547e-a52fdf27489e 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 = 130 x 95 km
a',b' = 65.0, 47.5 km
X0,Y0 = -150.4, 19.0 km
Mean diameter = 111 km

From 5 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: 2025-11-28, 04:44 UT (JD = 2461007.697)

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	9926.7	0.0°	None	2019-09-26	not scaled	2019-05-07
# 4058	1.0	32.996	261°, -1°	2.451081e6	9926.7	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] : cd7d0950-ddb8-11f0-547e-a52fdf27489e [observed] Occultation Date + Time : 2025-11-28 at 04:48:21 UT +/- 0.01 min [1] Object Designation : (410) Chloris Orbit Class : MBA Star Designation : GDR3 3393415594276209408 Star Coordinates (ICRF) : RA = 05 01 15.4897, DE = +16 20 43.922 [2] Star Magnitudes : G = 11.71 mag, RP = 10.9 mag, BP = 12.38 mag Object Magnitude : V = 13.25 mag Estimated Magnitude Drop : 1.8 mag Estimated Max. Duration : 7.8 sec Object Mean Diameter : 123.5 km (src: astorb) Speed of the shadow : 15.9 km/s Elongation to Moon & Sun : 101° (sunlit = 49%), Sun = 168° Cross-track uncertainty : 1.0 mas = 1 km = 0.01 path-width (1-sig) RUWE and duplicate source : 1.57 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] : cd7d0950-ddb8-11f0-547e-a52fdf27489e [observed]

 Occultation Date + Time   : 2025-11-28 at 04:48:21 UT +/- 0.01 min  [1]
 Object Designation        : (410) Chloris
 Orbit Class               : MBA
 Star Designation          : GDR3 3393415594276209408
 Star Coordinates (ICRF)   : RA = 05 01 15.4897, DE = +16 20 43.922  [2]
 Star Magnitudes           : G = 11.71 mag, RP = 10.9 mag, BP = 12.38 mag
 Object Magnitude          : V = 13.25 mag
 Estimated Magnitude Drop  : 1.8 mag
 Estimated Max. Duration   : 7.8 sec
 Object Mean Diameter      : 123.5 km  (src: astorb)
 Speed of the shadow       : 15.9 km/s
 Elongation to Moon & Sun  : 101° (sunlit = 49%), Sun = 168°
 Cross-track uncertainty   : 1.0 mas = 1 km = 0.01 path-width (1-sig)
 RUWE and duplicate source : 1.57 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

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

Aladin Lite direct link (has Gaia overlay)