2011-12-18 / TYC 4668-00680-1 / (1796) Riga
| # | OBS | Observer | Occ | Meth. | Instr. | CC | TSRC | UT1 | UT2 | UT3 | UT4 | UT2E | UT3E | Dur. | Chrd |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | show | Tim Haymes | O+ | VID | M300 | UK | GPS++ | 19:37:00 | 19:39:23.29 | 19:39:26.73 | 19:41:00 | 0.09 | 0.09 | 3.44 | 34.4 |
| 2 | show | John Talbot | O+ | VID | M200 | UK | GPS++ | 19:38:58 | 19:39:17.87 | 19:39:24.27 | 19:41:51 | 0.33 | 0.33 | 6.40 | 64.0 |
| 3 | show | Henk Bulder | O+ | VIS | M305 | NL | RAD | 19:39:00 | 19:40:09.3 | 19:40:13.9 | 19:42:30 | 0.5 | 0.2 | 4.60 | 46.0 |
| 4 | show | R. Simonson et al | O- | VID | M250 | UK | 19:38:00 | 19:42:00 | |||||||
| 5 | show | Harrie Rutten | O- | VID | M356 | NL | 19:40:01 | 19:42:20 |
5 observations found in db: euraster
Available (probably) matching predictions (click on the link to switch):| JPL#64 : a13f0f18-4b9c-4707-a9c1-00d4991115e8 [db: observed] |
Using prediction a13f0f18-4b9c-4707-a9c1-00d4991115e8 for map and profile fit
| Ellipse and circular profile fits to the timings (chords) |
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Auto-Fit Result: Size = 67 x 41 km a',b' = 33.3, 20.7 km X0,Y0 = 465.1, 18.4 km Mean diameter = 52 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 |
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| Event Details |
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Occultation UUID [and DB] : a13f0f18-4b9c-4707-a9c1-00d4991115e8 [observed] Occultation Date + Time : 2011-12-18 at 19:36:55 UT +/- 0.03 min [1] Object Designation : (1796) Riga Orbit Class : MBA Star Designation : GDR3 2540203710811571840 Star Coordinates (ICRF) : RA = 00 24 49.1165, DE = -03 41 34.627 [2] Star Magnitudes : G = 11.61 mag, RP = 11.17 mag, BP = 11.88 mag Object Magnitude : V = 16.12 mag Estimated Magnitude Drop : 4.5 mag Estimated Max. Duration : 7.4 sec Object Mean Diameter : 74 km (src: astorb) Speed of the shadow : 10.0 km/s Elongation to Moon & Sun : 169° (sunlit = 41%), Sun = 98° Cross-track uncertainty : 0.7 mas = 1 km = 0.02 path-width (1-sig) RUWE and duplicate source : 0.81 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#64 [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0 |
| More Data and Informations |
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(If error 404: link not valid which means no data available)
| Aladin Sky Atlas |
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| Aladin Lite direct link (has Gaia overlay) |