Cora»Occultation

2026-08-10 / UCAC4 440-090913 / (1794) Finsen

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Deborah Smith	O+	VID	M300	ES	GPS	20:06:29	20:07:30.140	20:07:31.907	20:08:29	0.052	0.052	1.77	16.1
2	show	Alexey Chernyshev	O+	CCD	M200	RU	GPS	20:01:13	20:01:47.761	20:01:51.261	20:02:01	0.300	0.300	3.50	31.8

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):

JPL75 : dc803cb0-d9ac-11f1-43f3-5678d578d823 [db: observed]

JPL75 : 540b43b0-d9ad-11f1-43f3-6fbdffff8d30 [db: observed]

JPL75 : 253c4600-d9ae-11f1-43f3-5447ddff7deb [db: observed]

Using prediction dc803cb0-d9ac-11f1-43f3-5678d578d823 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 = 2300.8, 24.5 km
Circular diameter = 34 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: 2026-08-10, 20:07 UT (JD = 2461263.338)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 4725	1.0	12.347	3°, 65°	2.457222e6	4041.3	0.0°	None	2020-10-05	not scaled	2019-10-23
# 4726	1.0	12.346	169°, 35°	2.457222e6	4041.3	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] : dc803cb0-d9ac-11f1-43f3-5678d578d823 [observed] Occultation Date + Time : 2026-08-10 at 20:07:16 UT +/- 0.01 min [1] Object Designation : (1794) Finsen Orbit Class : MBA Star Designation : GDR3 4262102279308230656 Star Coordinates (ICRF) : RA = 19 07 16.1290, DE = -02 08 57.032 [2] Star Magnitudes : G = 13.97 mag, RP = 13.53 mag, BP = 14.22 mag Object Magnitude : V = 15.77 mag Estimated Magnitude Drop : 2.0 mag Estimated Max. Duration : 4.1 sec Object Mean Diameter : 37.3 km (src: astorb) Speed of the shadow : 9.1 km/s Elongation to Moon & Sun : 156° (sunlit = 5%), Sun = 144° Cross-track uncertainty : 1.0 mas = 1 km = 0.04 path-width (1-sig) RUWE and duplicate source : 0.9 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL75 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] : dc803cb0-d9ac-11f1-43f3-5678d578d823 [observed]

 Occultation Date + Time   : 2026-08-10 at 20:07:16 UT +/- 0.01 min  [1]
 Object Designation        : (1794) Finsen
 Orbit Class               : MBA
 Star Designation          : GDR3 4262102279308230656
 Star Coordinates (ICRF)   : RA = 19 07 16.1290, DE = -02 08 57.032  [2]
 Star Magnitudes           : G = 13.97 mag, RP = 13.53 mag, BP = 14.22 mag
 Object Magnitude          : V = 15.77 mag
 Estimated Magnitude Drop  : 2.0 mag
 Estimated Max. Duration   : 4.1 sec
 Object Mean Diameter      : 37.3 km  (src: astorb)
 Speed of the shadow       : 9.1 km/s
 Elongation to Moon & Sun  : 156° (sunlit = 5%), Sun = 144°
 Cross-track uncertainty   : 1.0 mas = 1 km = 0.04 path-width (1-sig)
 RUWE and duplicate source : 0.9 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL75
 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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