Cora»Occultation

2023-04-25 / UCAC4 430-053659 / (249) Ilse

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Roland BONINSEGNA	O+	VID	M400	BE	GPS	21:59:4.	21:59:33.97	21:59:38.93	21:59:59	0.16	0.16	4.96	36.7
2	show	Simon Kidd	O+	VID	M350	GB	GPS	21:59:30	22:00:24.900	22:00:27.000	22:01:30	0.20	0.20	2.10	15.5

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#65 : 913b9150-ddb3-11f0-547e-18d1eecf27bb [db: observed]

Using prediction 913b9150-ddb3-11f0-547e-18d1eecf27bb 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 = -1964.3, 16.0 km
Circular diameter = 40 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: 2023-04-25, 21:59 UT (JD = 2460060.416)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 864	None	84.995	2°, 85°	2.444969e6	15091.4	0.0°	None	None	not scaled	2016-01-04
# 865	None	84.995	222°, 41°	2.444969e6	15091.4	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] : 913b9150-ddb3-11f0-547e-18d1eecf27bb [observed] Occultation Date + Time : 2023-04-25 at 21:57:43 UT +/- 0.0 min [1] Object Designation : (249) Ilse Orbit Class : MBA Star Designation : GDR3 3787062438014142336 Star Coordinates (ICRF) : RA = 11 24 43.9353, DE = -04 06 02.033 [2] Star Magnitudes : G = 14.26 mag, RP = 13.7 mag, BP = 14.64 mag Object Magnitude : V = 16.06 mag Estimated Magnitude Drop : 2.0 mag Estimated Max. Duration : 4.7 sec Object Mean Diameter : 34.8 km (src: astorb) Speed of the shadow : 7.4 km/s Elongation to Moon & Sun : 71° (sunlit = 32%), Sun = 138° Cross-track uncertainty : 0.3 mas = 0 km = 0.01 path-width (1-sig) RUWE and duplicate source : 0.99 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#65 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : 913b9150-ddb3-11f0-547e-18d1eecf27bb [observed]

 Occultation Date + Time   : 2023-04-25 at 21:57:43 UT +/- 0.0 min  [1]
 Object Designation        : (249) Ilse
 Orbit Class               : MBA
 Star Designation          : GDR3 3787062438014142336
 Star Coordinates (ICRF)   : RA = 11 24 43.9353, DE = -04 06 02.033  [2]
 Star Magnitudes           : G = 14.26 mag, RP = 13.7 mag, BP = 14.64 mag
 Object Magnitude          : V = 16.06 mag
 Estimated Magnitude Drop  : 2.0 mag
 Estimated Max. Duration   : 4.7 sec
 Object Mean Diameter      : 34.8 km  (src: astorb)
 Speed of the shadow       : 7.4 km/s
 Elongation to Moon & Sun  : 71° (sunlit = 32%), Sun = 138°
 Cross-track uncertainty   : 0.3 mas = 0 km = 0.01 path-width (1-sig)
 RUWE and duplicate source : 0.99 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#65
 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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