Collaborative Occultation Resources and Archive (CORA)

Occultations | Observations | Reports | Info + Credits | JOA | Admin | Login

2020-08-08 / 4UC 419-096262 / (307261) 2002 MS4

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Daniele Carosati O+ CCD M400 ES NTP 20:34:46 20:45:34.8 20:46:06.8 21:26:15 2.5 2.5 32.00 656.0
2 show Nello Ruocco O+ CCD M356 IT NTP 20:32:11 20:43:01.61 20:43:37.76 21:00:08 2.22 1.48 36.15 741.1
3 show Luigi Morrone O+ CCD M356 IT NTP 20:35:12 20:42:59.44 20:43:37.84 20:55:03 0.30 0.30 38.40 787.2
4 show Salvatore Lamina O+ CCD M130 IT GPS++ 20:38:00 20:43:18.9 20:43:54.9 20:48:00 2.0 2.0 36.00 738.0
5 show C. Schnabel et al O+ VID M400 ES GPS++ 20:37:00 20:43:57.45 20:44:17.93 20:49:09 0.64 0.64 20.48 419.8
6 show Gianluca Masi O+ CCD M432 IT NTP 20:05:16 20:43:02.16 20:43:41.66 21:04:04 2.50 2.00 39.50 809.8
7 show U. Tagliaferri et al O+ CCD M800 IT GPS 20:35:01 20:43:06.49 20:43:43.27 20:51:01 1.00 0.75 36.78 754.0
8 show Claudio Costa O+ CCD M280 IT GPS++ 20:38:00 20:43:08.53 20:43:43.54 20:48:00 1.00 2.00 35.01 717.7
9 show J. Lecacheux et al O+ VID M500 FR GPS++ 20:43:45.06 20:43:53.69 0.16 0.16 8.63 176.9
10 show Florian Signoret O+ VID M400 FR GPS++ 20:32:54 20:43:37.48 20:43:54.12 20:45:10 0.32 0.32 16.64 341.1
11 show M. Conjat/S. Renner O+ CCD M400 FR GPS 20:20:38 20:43:40.06 20:43:56.56 21:20:37 0.15 0.15 16.50 338.2
12 show M. Bachini/G. Succi O+ CCD M400 IT NTP 20:11:45 20:43:18.97 20:43:43.99 21:11:17 1.00 1.00 25.02 512.9
13 show N. Montigiani et al O+ CCD M356 IT NTP 20:19:45 20:43:15.18 20:43:41.89 21:20:12 2.23 2.23 26.71 547.6
14 show E. Frappa/A. Klotz O+ CCD M250 FR GPS++ 20:42:55 20:43:39.5 20:43:51.5 20:46:07 2.0 2.0 12.00 246.0
15 show Mauro Bertini O+ CCD M300 IT NTP 20:37:35 20:43:15.38 20:43:40.63 20:48:09 2.00 2.25 25.25 517.6
16 show Fabrizio Ciabattari O+ CCD M500 IT NTP 20:25:02 20:43:19.3 20:43:42.7 21:20:28 0.6 0.6 23.40 479.7
17 show Pietro Baruffetti O+ VID M300 IT GPS++ 20:10:37 20:43:21.28 20:43:44.32 21:10:12 1.28 1.28 23.04 472.3
18 show Michele Bigi O+ VID M200 IT GPS++ 20:33:00 20:43:20.88 20:43:43.92 20:53:00 1.28 1.28 23.04 472.3
19 show Roberto Bacci O+ CCD M410 IT NTP 20:41:30 20:43:19.45 20:43:43.45 20:49:23 2.0 2.0 24.00 492.0
20 show P. Bacci et al O+ CCD M600 IT GPS 20:30:12 20:43:17.8 20:43:45.1 21:04:33 1.1 1.1 27.30 559.6
21 show A. Valvasori et al O+ CCD M235 IT NTP 20:32:33 20:43:18.4 20:43:39.4 20:48:06 1.50 1.50 21.00 430.5
22 show I. Coretti et al O+ CCD M356 IT NTP 20:29:54 20:43:07.9 20:43:25.7 21:05:52 2.5 2.8 17.80 364.9
23 show R. Goncalves et al O- VID M508 PT 20:40:04 20:47:06
24 show M. Boutet/J. Sanchez O- VID M305 FR 20:39:08 20:48:07
25 show J.J. Castellani O- VID M400 FR 20:37:58 20:48:15
26 show E. Frappa et al O- VID M940 FR 20:38:54 20:49:10
27 show Marc Serrau O- CCD M275 FR 20:43:48 20:54:56
28 show Gianni Galli O- CCD M356 IT 20:19:40 21:10:11
29 show Alberto Ossola O- VID M230 CH 20:35:38 20:49:33
30 show Gianni Casalnuovo O- CCD M355 IT 20:42:00 20:45:00
31 show Lionel Rousselot O- CCD M250 FR 20:33:07 20:51:20
32 show Stefan Meister O- CCD M500 CH 20:42:31 20:44:32
33 show Bernd Gaehrken O- VID M800 DE 20:32:55 21:04:51
34 show Gerhard Dangl O- VID M254 AT 20:37:54 20:48:19
35 show Jiri Kubanek O- CCD M203 CZ 20:21:40 21:07:20
36 show Marian Urbanik O- CCD M252 SK 20:41:58 20:44:33
37 show Peter Delincak O- CCD M400 SK 20:08:00 21:20:00
38 show Jiri Polak O- CCD M303 CZ 20:27:40 21:07:39
39 show Michal Rottenborn O- CCD M303 CZ 20:41:13 20:45:13
40 show Oliver Kloes O- CCD M254 DE 20:38:07 20:48:04
41 show Zdenek Moravec O- CCD M432 CZ 20:41:01 20:46:26
42 show Bernd Klemt O- VID M305 DE 20:41:01 20:46:03
43 show Christian Weber O- CCD M254 DE 20:36:53 20:53:50
44 show W. Burzynski et al O- CCD M300 PL 20:37:97 20:47:15
UT1/UT4: Begin/End of observation | UT2/UT3: Begin/End of occultation | Dur: Reported duration in seconds | Chrd: Corresponding chord length in km | More

44 observations found in db: euraster

Available (probably) matching predictions (click on the link to switch):
JPL#20 : 98b8ab4b-412a-4e23-9608-39010d656231 [db: observed]

Using prediction 98b8ab4b-412a-4e23-9608-39010d656231 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 = 808 x 696 km
a',b' = 404.2, 347.8 km
X0,Y0 = 903.4, -190.3 km
Mean diameter = 750 km

From 22 chords (VID,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] : 98b8ab4b-412a-4e23-9608-39010d656231 [observed]

 Occultation Date + Time   : 2020-08-08 at 20:44:09 UT +/- 0.53 min  [1]
 Object Designation        : (307261) 2002 MS4
 Orbit Class               : TNO
 Star Designation          : GDR3 4253248324549054464
 Star Coordinates (ICRF)   : RA = 18 47 29.9638, DE = -06 16 31.473  [2]
 Star Magnitudes           : G = 14.62 mag, RP = 13.62 mag, BP = 15.64 mag
 Object Magnitude          : V = 20.39 mag
 Estimated Magnitude Drop  : 5.8 mag
 Estimated Max. Duration   : 31.6 sec
 Object Mean Diameter      : 648 km  (src: astorb)
 Speed of the shadow       : 20.5 km/s
 Elongation to Moon & Sun  : 95° (sunlit = 76%), Sun = 142°
 Cross-track uncertainty   : 14.3 mas = 475 km = 0.73 path-width (1-sig)
 RUWE and duplicate source : 1.06 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#20

 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
(If error 404: link not valid which means no data available)

Aladin Sky Atlas
Aladin Lite direct link (has Gaia overlay)