Cora»Occultation

2023-09-24 / UCAC4 560-045206 / (38) Leda

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Oliver Kloes	O+	CCD	M254	DE	GPS	01:33:00	01:35:12.74	01:35:15.14	01:37:00	0.31	0.31	2.40	80.6
2	show	Zdenek Moravec, Bohuslav Matous	O+	CCD	T432	CZ	GPS	01:34:20	1:35:17.07	1:35:17.97	01:36:18	0.15	0.15	0.90	30.2
3	show	Zdenek Moravec, Bohuslav Matous	O+	CCD	T432	CZ	GPS	01:34:20	1:35:15.7	1:35:18.4	01:36:18	0.3	0.3	2.70	90.7

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#145 : 2a43e5f0-ddb4-11f0-547e-e08bafe368a8 [db: observed]

Using prediction 2a43e5f0-ddb4-11f0-547e-e08bafe368a8 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:
Ellipse profile fit was not successful. Trying circular fit.

Circular diameter = 116 km

From 3 chords (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.

Sky projection (artificial light) for occ. time: 2023-09-24, 01:35 UT (JD = 2460211.566)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 720	None	12.836	161°, -15°	2.443956e6	16255.6	0.0°	None	2013-10-18	not scaled	2013-10-16
# 721	None	12.836	345°, -4°	2.443956e6	16255.6	0.0°	None	2013-10-18	not scaled	2013-10-16

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] : 2a43e5f0-ddb4-11f0-547e-e08bafe368a8 [observed] Occultation Date + Time : 2023-09-24 at 01:37:46 UT +/- 0.0 min [1] Object Designation : (38) Leda Orbit Class : MBA Star Designation : GDR3 0676895538863853184 Star Coordinates (ICRF) : RA = 08 10 17.2137, DE = +21 57 47.120 [2] Star Magnitudes : G = 12.36 mag, RP = 11.9 mag, BP = 12.66 mag Object Magnitude : V = 13.51 mag Estimated Magnitude Drop : 1.5 mag Estimated Max. Duration : 3.5 sec Object Mean Diameter : 115.9 km (src: astorb) Speed of the shadow : 33.6 km/s Elongation to Moon & Sun : 167° (sunlit = 64%), Sun = 61° Cross-track uncertainty : 0.7 mas = 1 km = 0.01 path-width (1-sig) RUWE and duplicate source : 0.98 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#145 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : 2a43e5f0-ddb4-11f0-547e-e08bafe368a8 [observed]

 Occultation Date + Time   : 2023-09-24 at 01:37:46 UT +/- 0.0 min  [1]
 Object Designation        : (38) Leda
 Orbit Class               : MBA
 Star Designation          : GDR3 0676895538863853184
 Star Coordinates (ICRF)   : RA = 08 10 17.2137, DE = +21 57 47.120  [2]
 Star Magnitudes           : G = 12.36 mag, RP = 11.9 mag, BP = 12.66 mag
 Object Magnitude          : V = 13.51 mag
 Estimated Magnitude Drop  : 1.5 mag
 Estimated Max. Duration   : 3.5 sec
 Object Mean Diameter      : 115.9 km  (src: astorb)
 Speed of the shadow       : 33.6 km/s
 Elongation to Moon & Sun  : 167° (sunlit = 64%), Sun = 61°
 Cross-track uncertainty   : 0.7 mas = 1 km = 0.01 path-width (1-sig)
 RUWE and duplicate source : 0.98 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#145
 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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