Cora»Occultation

2026-01-20 / UCAC4 505-003717 / (535) Montague

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Olivier Schreurs	O+	VID	M254	BE	GPS	20:34:19	20:35:19.80	20:35:23.70	20:36:19	0.600	0.600	3.90	52.6
2	show	Anna Marciniak	O+	CCD	M400	PL	GPS	20:34:58	20:35:59.88	20:36:01.14	20:36:59	0.100	0.100	1.26	17.0
3	show	Sven Andersson	O+	VID	M360	DE	GPS	20:35:17	20:35:47.682	20:35:49.682	20:36:17	0.053	0.053	2.00	27.0
4	show	Anna Marciniak	O+	CCD	M350	PL	NTP	20:34:55	20:35:53.23	20:35:58.43	20:36:59	0.120	0.120	5.20	70.2
5	show	Wojciech Burzynski	O+	VID	T600	PL	GPS	20:35:31	20:36:16.14	20:36:18.46	20:36:59	0.080	0.080	2.32	31.3

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#104 : 43df8910-de6d-11f0-4858-6b43ff7fbf4c [db: asteroids]

Using prediction 43df8910-de6d-11f0-4858-6b43ff7fbf4c 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 = 96 x 68 km
a',b' = 48.2, 34.2 km
X0,Y0 = 1171.4, 10.5 km
Mean diameter = 81 km

From 5 chords (VID,CCD)

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.

Map with groundtrack and observer stations

Event Details
Occultation UUID [and DB] : 43df8910-de6d-11f0-4858-6b43ff7fbf4c [asteroids] Occultation Date + Time : 2026-01-20 at 20:29:53 UT +/- 0.01 min [1] Object Designation : (535) Montague Orbit Class : MBA Star Designation : GDR3 0024551961504978304 Star Coordinates (ICRF) : RA = 02 24 51.7176, DE = +10 55 32.204 [2] Star Magnitudes : G = 13.18 mag, RP = 12.65 mag, BP = 13.54 mag Object Magnitude : V = 14.46 mag Estimated Magnitude Drop : 1.6 mag Estimated Max. Duration : 5.5 sec Object Mean Diameter : 74.5 km (src: astorb) Speed of the shadow : 13.5 km/s Elongation to Moon & Sun : 73° (sunlit = 4%), Sun = 97° Cross-track uncertainty : 1.1 mas = 1 km = 0.02 path-width (1-sig) RUWE and duplicate source : 3.1 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#104 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : 43df8910-de6d-11f0-4858-6b43ff7fbf4c [asteroids]

 Occultation Date + Time   : 2026-01-20 at 20:29:53 UT +/- 0.01 min  [1]
 Object Designation        : (535) Montague
 Orbit Class               : MBA
 Star Designation          : GDR3 0024551961504978304
 Star Coordinates (ICRF)   : RA = 02 24 51.7176, DE = +10 55 32.204  [2]
 Star Magnitudes           : G = 13.18 mag, RP = 12.65 mag, BP = 13.54 mag
 Object Magnitude          : V = 14.46 mag
 Estimated Magnitude Drop  : 1.6 mag
 Estimated Max. Duration   : 5.5 sec
 Object Mean Diameter      : 74.5 km  (src: astorb)
 Speed of the shadow       : 13.5 km/s
 Elongation to Moon & Sun  : 73° (sunlit = 4%), Sun = 97°
 Cross-track uncertainty   : 1.1 mas = 1 km = 0.02 path-width (1-sig)
 RUWE and duplicate source : 3.1 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#104
 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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