Cora»Occultation

2022-12-25 / UCAC4 544-023481 / (418) Alemannia

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Stefan Meister	O+	VID	M500	CH	GPS	21:09:14	21:09:42.930	21:09:45.300	21:10:14	0.08	0.30	2.37	27.3
2	show	Gregor Krannich	O+	VID	M350	DE	GPS	21:08:21	21:09:27.927	21:09:30.468	21:10:40	0.302	0.302	2.54	29.2
3	show	Jiri Kubanek	O+	VID	M200	DE	GPS	21:07:11	21:09:09.3	21:09:13.5	21:11:13	0.7	0.7	4.20	48.3

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#112 : 486ccde0-ddb3-11f0-547e-6758dedfbaf5 [db: observed]

Using prediction 486ccde0-ddb3-11f0-547e-6758dedfbaf5 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 = 213 x 7 km
a',b' = 106.4, 3.7 km
X0,Y0 = 500.8, 17.3 km
Mean diameter = 40 km

From 3 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: 2022-12-25, 21:08 UT (JD = 2459939.381)

DAMIT	Q	P (h)	λ, β	JD0	JD-JD0	φ0	Version	Modified	Vol-equiv D	Cmnt
# 5342	1.0	4.672	337°, -39°	2.457369e6	2570.4	0.0°	None	2020-10-05	not scaled	2019-10-23

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] : 486ccde0-ddb3-11f0-547e-6758dedfbaf5 [observed] Occultation Date + Time : 2022-12-25 at 21:07:02 UT +/- 0.0 min [1] Object Designation : (418) Alemannia Orbit Class : MBA Star Designation : GDR3 3373660428343646720 Star Coordinates (ICRF) : RA = 06 12 34.9825, DE = +18 43 13.705 [2] Star Magnitudes : G = 14.18 mag, RP = 13.64 mag, BP = 14.55 mag Object Magnitude : V = 12.87 mag Estimated Magnitude Drop : 0.3 mag Estimated Max. Duration : 3.0 sec Object Mean Diameter : 34.1 km (src: astorb) Speed of the shadow : 11.5 km/s Elongation to Moon & Sun : 143° (sunlit = 9%), Sun = 175° Cross-track uncertainty : 0.7 mas = 0 km = 0.02 path-width (1-sig) RUWE and duplicate source : 0.93 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#112 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : 486ccde0-ddb3-11f0-547e-6758dedfbaf5 [observed]

 Occultation Date + Time   : 2022-12-25 at 21:07:02 UT +/- 0.0 min  [1]
 Object Designation        : (418) Alemannia
 Orbit Class               : MBA
 Star Designation          : GDR3 3373660428343646720
 Star Coordinates (ICRF)   : RA = 06 12 34.9825, DE = +18 43 13.705  [2]
 Star Magnitudes           : G = 14.18 mag, RP = 13.64 mag, BP = 14.55 mag
 Object Magnitude          : V = 12.87 mag
 Estimated Magnitude Drop  : 0.3 mag
 Estimated Max. Duration   : 3.0 sec
 Object Mean Diameter      : 34.1 km  (src: astorb)
 Speed of the shadow       : 11.5 km/s
 Elongation to Moon & Sun  : 143° (sunlit = 9%), Sun = 175°
 Cross-track uncertainty   : 0.7 mas = 0 km = 0.02 path-width (1-sig)
 RUWE and duplicate source : 0.93 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#112
 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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