Cora»Occultation

2026-03-04 / UCAC4 587-021063 / (42) Isis

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Alfonso Noschese	O+	VID	M450	IT	GPS	22:19:44	22:20:35.3	22:20:49.5	22:21:43	0.500	0.500	14.20	115.0
2	show	Eric Barbotin	O+	VID	T508	FR	GPS	22:17:11	22:18:34.10	22:18:49.42	22:20:11	0.530	0.530	15.32	124.1

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

2 observations found in db: sodis

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

JPL#138 : 41f3f7a0-de6b-11f0-4858-6a02fabd4517 [db: asteroids]

Using prediction 41f3f7a0-de6b-11f0-4858-6a02fabd4517 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 = 191.0, 31.0 km
Circular diameter = 124 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: 2026-03-04, 22:19 UT (JD = 2461104.430)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 315	None	13.584	106°, 40°	2.440688e6	20416.4	0.0°	None	2013-07-24	97.0 +/- 10.0 km	2011-04-21
# 1841	4.0	13.584	108°, 44°	2.440688e6	20416.4	0.0°	None	2017-09-21	104.0 +/- 4.0 km	2017-09-21

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] : 41f3f7a0-de6b-11f0-4858-6a02fabd4517 [asteroids] Occultation Date + Time : 2026-03-04 at 22:11:14 UT +/- 0.01 min [1] Object Designation : (42) Isis Orbit Class : MBA Star Designation : GDR3 3430996729916501248 Star Coordinates (ICRF) : RA = 05 49 52.0556, DE = +27 22 37.907 [2] Star Magnitudes : G = 14.27 mag, RP = 13.51 mag, BP = 14.84 mag Object Magnitude : V = 12.9 mag Estimated Magnitude Drop : 0.3 mag Estimated Max. Duration : 12.4 sec Object Mean Diameter : 100.2 km (src: astorb) Speed of the shadow : 8.1 km/s Elongation to Moon & Sun : 94° (sunlit = 98%), Sun = 103° Cross-track uncertainty : 1.0 mas = 1 km = 0.02 path-width (1-sig) RUWE and duplicate source : 1.04 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#138 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] : 41f3f7a0-de6b-11f0-4858-6a02fabd4517 [asteroids]

 Occultation Date + Time   : 2026-03-04 at 22:11:14 UT +/- 0.01 min  [1]
 Object Designation        : (42) Isis
 Orbit Class               : MBA
 Star Designation          : GDR3 3430996729916501248
 Star Coordinates (ICRF)   : RA = 05 49 52.0556, DE = +27 22 37.907  [2]
 Star Magnitudes           : G = 14.27 mag, RP = 13.51 mag, BP = 14.84 mag
 Object Magnitude          : V = 12.9 mag
 Estimated Magnitude Drop  : 0.3 mag
 Estimated Max. Duration   : 12.4 sec
 Object Mean Diameter      : 100.2 km  (src: astorb)
 Speed of the shadow       : 8.1 km/s
 Elongation to Moon & Sun  : 94° (sunlit = 98%), Sun = 103°
 Cross-track uncertainty   : 1.0 mas = 1 km = 0.02 path-width (1-sig)
 RUWE and duplicate source : 1.04 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#138
 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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