Cora»Occultation

2010-01-31 / HIP 3416 / (106) Dione

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Melvyn Taylor	O+	VIS	L102	UK	PHONE	17:53:00		18:01:39.3	18:03:00		0.2
2	show	Andrew Elliott	O+	VID	M406	UK	GPS++	18:00:00	18:01:31.69	18:01:34.43	18:03:00	0.01	0.01	2.74	93.2
3	show	Pete Franklin	O+	VID	M254	UK	GPS++	18:01:26	18:01:32.12	18:01:33.62	18:01:36	0.02	0.02	1.50	51.0
4	show	Martin Cole	O+	VIS	M280	UK	GPS	18:00:00	18:01:31	18:01:34	18:02:00	1	1	3.00	102.0
5	show	Johan Warell	O-	CCD	M250	SE		18:01:31			18:02:31

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

5 observations found in db: euraster

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

JPL#141 : ea3c96bb-99ab-4da7-98a2-8268a39bb7aa [db: observed]

Using prediction ea3c96bb-99ab-4da7-98a2-8268a39bb7aa 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 = 183 x 22 km
a',b' = 91.3, 10.8 km
X0,Y0 = 1625.4, 98.3 km
Mean diameter = 63 km

From 3 chords (VID,VIS)

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.

Map with groundtrack and observer stations

Event Details
Occultation UUID [and DB] : ea3c96bb-99ab-4da7-98a2-8268a39bb7aa [observed] Occultation Date + Time : 2010-01-31 at 17:59:41 UT +/- 0.01 min [1] Object Designation : (106) Dione Orbit Class : MBA Star Designation : GDR3 2550347049175255936 Star Coordinates (ICRF) : RA = 00 43 28.8267, DE = +02 18 28.425 [2] Star Magnitudes : G = 8.86 mag, RP = 8.47 mag, BP = 9.1 mag Object Magnitude : V = 13.29 mag Estimated Magnitude Drop : 4.5 mag Estimated Max. Duration : 4.3 sec Object Mean Diameter : 147 km (src: astorb) Speed of the shadow : 34.0 km/s Elongation to Moon & Sun : 142° (sunlit = 97%), Sun = 59° Cross-track uncertainty : 3.0 mas = 6 km = 0.04 path-width (1-sig) RUWE and duplicate source : 0.98 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#141 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] : ea3c96bb-99ab-4da7-98a2-8268a39bb7aa [observed]

 Occultation Date + Time   : 2010-01-31 at 17:59:41 UT +/- 0.01 min  [1]
 Object Designation        : (106) Dione
 Orbit Class               : MBA
 Star Designation          : GDR3 2550347049175255936
 Star Coordinates (ICRF)   : RA = 00 43 28.8267, DE = +02 18 28.425  [2]
 Star Magnitudes           : G = 8.86 mag, RP = 8.47 mag, BP = 9.1 mag
 Object Magnitude          : V = 13.29 mag
 Estimated Magnitude Drop  : 4.5 mag
 Estimated Max. Duration   : 4.3 sec
 Object Mean Diameter      : 147 km  (src: astorb)
 Speed of the shadow       : 34.0 km/s
 Elongation to Moon & Sun  : 142° (sunlit = 97%), Sun = 59°
 Cross-track uncertainty   : 3.0 mas = 6 km = 0.04 path-width (1-sig)
 RUWE and duplicate source : 0.98 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#141

 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

SiMDA \| 3D Asteroid Catalogue \| Johnston Archive \| Star at CDS (Vizier) \| JPL Small-Body Node \| Minor Planet Center \| Wikipedia

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Aladin Sky Atlas

Aladin Lite direct link (has Gaia overlay)

Collaborative Occultation Resources and Archive (CORA)

2010-01-31 / HIP 3416 / (106) Dione