Cora»Occultation

2023-09-08 / UCAC4 502-141527 / (1490) Limpopo

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Antoni Selva, Carlos Perello	O+	VID	M500	ES	GPS	19:02:45	19:04:40.48	19:04:42.66	19:06:44	0.04	0.02	2.18	14.6
2	show	Alberto Ossola	O+	VID	M230	CH	GPS	19:01:26	19:03:02.48	19:03:05.32	19:04:11	0.04	0.04	2.84	19.0
3	show	Stefano Sposetti, +1	O+	VID	M200	CH	GPS	19:02:30	19:02:58.92	19:03:00.60	19:03:15	0.08	0.08	1.68	11.3
4	show	Jean-Francois Pittet	O+	VID	M254	DE	GPS	19:00:47	19:02:21.507	19:02:23.479	19:03:47	0.015	0.015	1.97	13.2
5	show	Jiri Kubanek	O+	VID	M200	CZ	GPS	18:59:48	19:01:45.01	19:01:46.81	19:03:52	0.03	0.03	1.80	12.1
6	show	Jan Manek	O+	VID	M355	CZ	GPS	19:00:10	19:01:36.752	19:01:38.630	19:03:10	0.003	0.003	1.88	12.6
7	show	Zdenek Sikac	O-	VID	T150	CZ	NTP	19:00:01			19:04:00

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

7 observations found in db: sodis

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

JPL#71 : 1adc1c90-ddb4-11f0-547e-68627cfda93b [db: observed]

Using prediction 1adc1c90-ddb4-11f0-547e-68627cfda93b 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 = 24 x 11 km
a',b' = 12.2, 5.3 km
X0,Y0 = 2402.9, 29.6 km
Mean diameter = 16 km

From 6 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: 2023-09-08, 19:03 UT (JD = 2460196.294)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 642	None	6.652	142°, 2°	2.451051e6	9145.3	0.0°	None	None	not scaled	2013-02-11
# 643	None	6.652	319°, 22°	2.451051e6	9145.3	0.0°	None	None	not scaled	2013-02-11

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] : 1adc1c90-ddb4-11f0-547e-68627cfda93b [observed] Occultation Date + Time : 2023-09-08 at 19:00:07 UT +/- 0.0 min [1] Object Designation : (1490) Limpopo Orbit Class : MBA Star Designation : GDR3 2724084729770427136 Star Coordinates (ICRF) : RA = 22 13 03.1896, DE = +10 20 39.098 [2] Star Magnitudes : G = 11.37 mag, RP = 10.85 mag, BP = 11.72 mag Object Magnitude : V = 14.32 mag Estimated Magnitude Drop : 3.0 mag Estimated Max. Duration : 2.8 sec Object Mean Diameter : 18.6 km (src: astorb) Speed of the shadow : 6.7 km/s Elongation to Moon & Sun : 114° (sunlit = 32%), Sun = 159° Cross-track uncertainty : 0.7 mas = 0 km = 0.03 path-width (1-sig) RUWE and duplicate source : 0.89 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#71 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : 1adc1c90-ddb4-11f0-547e-68627cfda93b [observed]

 Occultation Date + Time   : 2023-09-08 at 19:00:07 UT +/- 0.0 min  [1]
 Object Designation        : (1490) Limpopo
 Orbit Class               : MBA
 Star Designation          : GDR3 2724084729770427136
 Star Coordinates (ICRF)   : RA = 22 13 03.1896, DE = +10 20 39.098  [2]
 Star Magnitudes           : G = 11.37 mag, RP = 10.85 mag, BP = 11.72 mag
 Object Magnitude          : V = 14.32 mag
 Estimated Magnitude Drop  : 3.0 mag
 Estimated Max. Duration   : 2.8 sec
 Object Mean Diameter      : 18.6 km  (src: astorb)
 Speed of the shadow       : 6.7 km/s
 Elongation to Moon & Sun  : 114° (sunlit = 32%), Sun = 159°
 Cross-track uncertainty   : 0.7 mas = 0 km = 0.03 path-width (1-sig)
 RUWE and duplicate source : 0.89 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#71
 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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