Cora»Occultation

2026-01-23 / UCAC4 591-019016 / (87) Sylvia

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Gintautas Drazdauskas	O+	VID	M254	LT	GPS	22:36:35	22:37:12.9	22:37:24.9	22:38:07	1.000	1.000	12.00	96.0
2	show	Vytautas Gailevicius	O+	VID	M250	LT	GPS	22:36:32	22:37:24.4	22:37:31.6	22:38:30	0.400	0.400	7.20	57.6
3	show	Donatas Tamonis	O-	VID	M200	LT	GPS	22:36:31	::	::	22:38:30

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#128 : 68d127d0-de6b-11f0-4858-db6fafbfd3bc [db: asteroids]

Using prediction 68d127d0-de6b-11f0-4858-db6fafbfd3bc 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 = -382.2, -8.3 km
Circular diameter = 195 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: 2026-01-23, 22:37 UT (JD = 2461064.442)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 148	None	5.184	71°, 66°	2.44538690762e6	15677.5	0.0°	None	2013-07-24	258.0 +/- 28.0 km	2007-02-27
# 719	4.0	5.184	72°, 68°	2.44375e6	17314.4	0.0°	None	2017-06-19	277.0 +/- 5.0 km	2017-06-13

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] : 68d127d0-de6b-11f0-4858-db6fafbfd3bc [asteroids] Occultation Date + Time : 2026-01-23 at 22:42:03 UT +/- 0.02 min [1] Object Designation : (87) Sylvia Orbit Class : MBA Star Designation : GDR3 3445318517405639680 Star Coordinates (ICRF) : RA = 05 28 09.5363, DE = +28 08 27.672 [2] Star Magnitudes : G = 13.15 mag, RP = 12.19 mag, BP = 14.1 mag Object Magnitude : V = 12.59 mag Estimated Magnitude Drop : 0.5 mag Estimated Max. Duration : 32.4 sec Object Mean Diameter : 260.9 km (src: astorb) Speed of the shadow : 8.0 km/s Elongation to Moon & Sun : 78° (sunlit = 26%), Sun = 139° Cross-track uncertainty : 1.4 mas = 2 km = 0.01 path-width (1-sig) RUWE and duplicate source : 4.45 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#128 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] : 68d127d0-de6b-11f0-4858-db6fafbfd3bc [asteroids]

 Occultation Date + Time   : 2026-01-23 at 22:42:03 UT +/- 0.02 min  [1]
 Object Designation        : (87) Sylvia
 Orbit Class               : MBA
 Star Designation          : GDR3 3445318517405639680
 Star Coordinates (ICRF)   : RA = 05 28 09.5363, DE = +28 08 27.672  [2]
 Star Magnitudes           : G = 13.15 mag, RP = 12.19 mag, BP = 14.1 mag
 Object Magnitude          : V = 12.59 mag
 Estimated Magnitude Drop  : 0.5 mag
 Estimated Max. Duration   : 32.4 sec
 Object Mean Diameter      : 260.9 km  (src: astorb)
 Speed of the shadow       : 8.0 km/s
 Elongation to Moon & Sun  : 78° (sunlit = 26%), Sun = 139°
 Cross-track uncertainty   : 1.4 mas = 2 km = 0.01 path-width (1-sig)
 RUWE and duplicate source : 4.45 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#128
 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

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