Collaborative Occultation Resources and Archive (CORA)

2024-07-04 / G183510.7-145935 / (50000) Quaoar

#	OBS	Observer	Occ	Meth.	Instr.	CC	TSRC	UT1	UT2	UT3	UT4	UT2E	UT3E	Dur.	Chrd
1	show	Antoni Selva	O+	VID	M406	ES	GPS	22:55:42	22:57:29.000	22:58:01.000	22:59:41	2.00	3.00	32.00	787.2
2	show	Andreas Schweizer	O+	VID	T850	CH	GPS	22:55:00	22:56:57.600	22:57:43.300	22:59:00	1.600	0.900	45.70	1124.2
3	show	Olivier Schreurs	O+	VID	M406	BE	GPS	22:55:29	22:57:06.7	22:57:47.0	22:59:30	1.3	4	40.30	991.4
4	show	Anna Marciniak	O+	CCD	M400	PL	GPS	22:41:47	22:56:35.000	22:57:14.000	23:06:45	4.00	5.00	39.00	959.4

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

4 observations found in db: sodis

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

JPL#45 : f5bbeda3-a713-4f7a-9504-c89f149b6d15 [db: cetnos]

Using prediction f5bbeda3-a713-4f7a-9504-c89f149b6d15 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 = 1149 x 703 km
a',b' = 574.7, 351.6 km
X0,Y0 = 204.4, -55.4 km
Mean diameter = 899 km

From 4 chords (CCD,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.

Map with groundtrack and observer stations

Event Details
Occultation UUID [and DB] : f5bbeda3-a713-4f7a-9504-c89f149b6d15 [cetnos] Occultation Date + Time : 2024-07-04 at 22:57:20 UT +/- 0.11 min [1] Object Designation : (50000) Quaoar Orbit Class : TNO Star Designation : GDR3 4103264802318239360 Star Coordinates (ICRF) : RA = 18 35 10.7006, DE = -14 59 34.937 [2] Star Magnitudes : G = 17.19 mag, RP = 16.16 mag, BP = 17.73 mag Object Magnitude : V = 18.73 mag Estimated Magnitude Drop : 1.8 mag Estimated Max. Duration : 45.7 sec Object Mean Diameter : 1125.8 km (src: CORA+astorb) Speed of the shadow : 24.6 km/s Elongation to Moon & Sun : 165° (sunlit = 1%), Sun = 170° Cross-track uncertainty : 3.8 mas = 114 km = 0.10 path-width (1-sig) RUWE and duplicate source : 1.04 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#45 Object is a "TNOs are cool" target ! [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

Event Details

 Occultation UUID [and DB] : f5bbeda3-a713-4f7a-9504-c89f149b6d15 [cetnos]

 Occultation Date + Time   : 2024-07-04 at 22:57:20 UT +/- 0.11 min  [1]
 Object Designation        : (50000) Quaoar
 Orbit Class               : TNO
 Star Designation          : GDR3 4103264802318239360
 Star Coordinates (ICRF)   : RA = 18 35 10.7006, DE = -14 59 34.937  [2]
 Star Magnitudes           : G = 17.19 mag, RP = 16.16 mag, BP = 17.73 mag
 Object Magnitude          : V = 18.73 mag
 Estimated Magnitude Drop  : 1.8 mag
 Estimated Max. Duration   : 45.7 sec
 Object Mean Diameter      : 1125.8 km  (src: CORA+astorb)
 Speed of the shadow       : 24.6 km/s
 Elongation to Moon & Sun  : 165° (sunlit = 1%), Sun = 170°
 Cross-track uncertainty   : 3.8 mas = 114 km = 0.10 path-width (1-sig)
 RUWE and duplicate source : 1.04 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#45

 Object is a "TNOs are cool" 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
18 35 10.701 -14 59 34.94 FoV: 29.96' +– × × Go to:
Aladin Lite direct link (has Gaia overlay)