Cora»Occultation

2018-12-25 / 4UC 425-000933 / (105) Artemis

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Pierre Le Cam	O+	CCD	M500	FR	GPS++	19:04:41	19:07:33.00	19:07:38.10	19:10:41	0.06	0.06	5.10	64.8
2	show	Lionel Rousselot	O+	CCD	M250	FR	NTP	19:06:30	19:07:38.99	19:07:45.97	19:08:30	0.05	0.18	6.98	88.6

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: euraster

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

JPL#138 : 8e4e77c6-24cc-4caa-a0aa-e3f7ad8d9238 [db: observed]

Using prediction 8e4e77c6-24cc-4caa-a0aa-e3f7ad8d9238 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 = 1178.0, -13.8 km
Circular diameter = 179 km

From 2 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.

Map with groundtrack and observer stations

Event Details
Occultation UUID [and DB] : 8e4e77c6-24cc-4caa-a0aa-e3f7ad8d9238 [observed] Occultation Date + Time : 2018-12-25 at 19:04:52 UT +/- 0.01 min [1] Object Designation : (105) Artemis Orbit Class : MBA Star Designation : GDR3 2524243371821862912 Star Coordinates (ICRF) : RA = 00 45 41.0433, DE = -05 05 32.160 [2] Star Magnitudes : G = 13.48 mag, RP = 12.93 mag, BP = 13.86 mag Object Magnitude : V = 13.95 mag Estimated Magnitude Drop : 1.0 mag Estimated Max. Duration : 9.4 sec Object Mean Diameter : 119 km (src: astorb) Speed of the shadow : 12.7 km/s Elongation to Moon & Sun : 127° (sunlit = 87%), Sun = 94° Cross-track uncertainty : 1.3 mas = 2 km = 0.02 path-width (1-sig) RUWE and duplicate source : 1.04 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#138 [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : 8e4e77c6-24cc-4caa-a0aa-e3f7ad8d9238 [observed]

 Occultation Date + Time   : 2018-12-25 at 19:04:52 UT +/- 0.01 min  [1]
 Object Designation        : (105) Artemis
 Orbit Class               : MBA
 Star Designation          : GDR3 2524243371821862912
 Star Coordinates (ICRF)   : RA = 00 45 41.0433, DE = -05 05 32.160  [2]
 Star Magnitudes           : G = 13.48 mag, RP = 12.93 mag, BP = 13.86 mag
 Object Magnitude          : V = 13.95 mag
 Estimated Magnitude Drop  : 1.0 mag
 Estimated Max. Duration   : 9.4 sec
 Object Mean Diameter      : 119 km  (src: astorb)
 Speed of the shadow       : 12.7 km/s
 Elongation to Moon & Sun  : 127° (sunlit = 87%), Sun = 94°
 Cross-track uncertainty   : 1.3 mas = 2 km = 0.02 path-width (1-sig)
 RUWE and duplicate source : 1.04 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#138

 
 [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

More Data and Informations

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Aladin Sky Atlas

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Collaborative Occultation Resources and Archive (CORA)

2018-12-25 / 4UC 425-000933 / (105) Artemis