Cora»Occultation

2025-08-12 / UCAC4 300-160343 / (1746) Brouwer

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Ferran Casarramona	O+	VID	M200	ES	GPS	23:04:01	23:04:57.24	23:05:07.48	23:06:01	2.200	2.200	10.24	59.4
2	show	Deborah Smith	O+	VID	M300	ES	GPS	23:03:10	23:05:07.126	23:05:16.127	23:07:10	0.375	0.375	9.00	52.2

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):

JPL#80 : 39f979d0-ddb7-11f0-547e-4d2ae77ff9e1 [db: observed]

Using prediction 39f979d0-ddb7-11f0-547e-4d2ae77ff9e1 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 = -4103.2, 23.0 km
Circular diameter = 63 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: 2025-08-12, 23:03 UT (JD = 2460900.460)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 937	None	19.726	21°, -67°	2.449508e6	11392.5	0.0°	None	None	not scaled	2016-01-04
# 938	None	19.725	158°, -71°	2.449508e6	11392.5	0.0°	None	None	not scaled	2016-01-04

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] : 39f979d0-ddb7-11f0-547e-4d2ae77ff9e1 [observed] Occultation Date + Time : 2025-08-12 at 23:00:41 UT +/- 0.04 min [1] Object Designation : (1746) Brouwer Orbit Class : MBA Star Designation : GDR3 4056239411590909696 Star Coordinates (ICRF) : RA = 17 59 12.1213, DE = -30 08 11.743 [2] Star Magnitudes : G = 13.77 mag, RP = 12.6 mag, BP = 15.26 mag Object Magnitude : V = 15.98 mag Estimated Magnitude Drop : 2.3 mag Estimated Max. Duration : 11.2 sec Object Mean Diameter : 64.2 km (src: astorb) Speed of the shadow : 5.8 km/s Elongation to Moon & Sun : 98° (sunlit = 84%), Sun = 129° Cross-track uncertainty : 0.4 mas = 0 km = 0.01 path-width (1-sig) RUWE and duplicate source : 0.85 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#80 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : 39f979d0-ddb7-11f0-547e-4d2ae77ff9e1 [observed]

 Occultation Date + Time   : 2025-08-12 at 23:00:41 UT +/- 0.04 min  [1]
 Object Designation        : (1746) Brouwer
 Orbit Class               : MBA
 Star Designation          : GDR3 4056239411590909696
 Star Coordinates (ICRF)   : RA = 17 59 12.1213, DE = -30 08 11.743  [2]
 Star Magnitudes           : G = 13.77 mag, RP = 12.6 mag, BP = 15.26 mag
 Object Magnitude          : V = 15.98 mag
 Estimated Magnitude Drop  : 2.3 mag
 Estimated Max. Duration   : 11.2 sec
 Object Mean Diameter      : 64.2 km  (src: astorb)
 Speed of the shadow       : 5.8 km/s
 Elongation to Moon & Sun  : 98° (sunlit = 84%), Sun = 129°
 Cross-track uncertainty   : 0.4 mas = 0 km = 0.01 path-width (1-sig)
 RUWE and duplicate source : 0.85 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#80
 Note                      : FP:true

 
 [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)