Cora»Occultation

2026-03-12 / UCAC4 389-052826 / (3803) Tuchkova

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Wacław Pieczonka	O+	VID	M200	PL	NTP	23:04:36	23:05:28.213	23:05:30.767	23:06:27	0.015	0.020	2.55	30.9
2	show	Piotr Walczak	O+	VID	M130	PL	GPS	23:04:50	23:05:48.2	23:05:51.0	23:06:50	0.300	0.200	2.80	33.9
3	show	Marek Zawilski, Mieczyslaw Borkowski	O+	VID	M200	PL	GPS	23:04:53	23:05:49.97	23:05:52.87	23:06:53	0.030	0.040	2.90	35.1

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

3 observations found in db: sodis

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

JPL#72 : 297d7380-de76-11f0-4858-d9b9db7f3fea [db: asteroids]

Using prediction 297d7380-de76-11f0-4858-d9b9db7f3fea 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 = 175 x 16 km
a',b' = 87.3, 8.2 km
X0,Y0 = -2710.3, 23.0 km
Mean diameter = 53 km

From 3 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: 2026-03-12, 23:04 UT (JD = 2461112.461)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 5252	1.0	6.070	173°, 35°	2.457381e6	3731.5	0.0°	None	2020-10-05	not scaled	2019-10-23
# 5253	1.0	6.070	4°, 62°	2.457381e6	3731.5	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] : 297d7380-de76-11f0-4858-d9b9db7f3fea [asteroids] Occultation Date + Time : 2026-03-12 at 23:03:23 UT +/- 0.01 min [1] Object Designation : (3803) Tuchkova Orbit Class : MBA Star Designation : GDR3 3754529087244629632 Star Coordinates (ICRF) : RA = 10 36 32.4606, DE = -12 13 16.199 [2] Star Magnitudes : G = 10.53 mag, RP = 10.22 mag, BP = 10.71 mag Object Magnitude : V = 15.7 mag Estimated Magnitude Drop : 5.2 mag Estimated Max. Duration : 2.9 sec Object Mean Diameter : 35.5 km (src: astorb) Speed of the shadow : 12.1 km/s Elongation to Moon & Sun : 111° (sunlit = 36%), Sun = 159° Cross-track uncertainty : 1.4 mas = 1 km = 0.06 path-width (1-sig) RUWE and duplicate source : 3.59 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#72 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : 297d7380-de76-11f0-4858-d9b9db7f3fea [asteroids]

 Occultation Date + Time   : 2026-03-12 at 23:03:23 UT +/- 0.01 min  [1]
 Object Designation        : (3803) Tuchkova
 Orbit Class               : MBA
 Star Designation          : GDR3 3754529087244629632
 Star Coordinates (ICRF)   : RA = 10 36 32.4606, DE = -12 13 16.199  [2]
 Star Magnitudes           : G = 10.53 mag, RP = 10.22 mag, BP = 10.71 mag
 Object Magnitude          : V = 15.7 mag
 Estimated Magnitude Drop  : 5.2 mag
 Estimated Max. Duration   : 2.9 sec
 Object Mean Diameter      : 35.5 km  (src: astorb)
 Speed of the shadow       : 12.1 km/s
 Elongation to Moon & Sun  : 111° (sunlit = 36%), Sun = 159°
 Cross-track uncertainty   : 1.4 mas = 1 km = 0.06 path-width (1-sig)
 RUWE and duplicate source : 3.59 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#72
 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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