2021-05-19 / 4UC 538-049162 / (18) Melpomene
| # | OBS | Observer | Occ | Meth. | Instr. | CC | TSRC | UT1 | UT2 | UT3 | UT4 | UT2E | UT3E | Dur. | Chrd |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | show | Nick Sioulas | O+ | CCD | M250 | GR | NTP | 21:21:58 | 21:23:10.38 | 21:23:16.10 | 21:25:09 | 0.19 | 0.19 | 5.72 | 131.6 |
| 2 | show | Paolo Fini | O+ | CCD | M305 | IT | GPS++ | 21:22:21 | 21:22:48.80 | 21:22:54.57 | 21:23:27 | 0.13 | 0.13 | 5.77 | 132.7 |
| 3 | show | Gianni Galli | O+ | CCD | M356 | IT | NTP | 21:22:36 | 21:22:40.19 | 21:22:44.21 | 21:22:48 | 0.50 | 0.51 | 4.02 | 92.5 |
| 4 | show | Jean-Marie Laugier | O- | CCD | V112 | FR | 21:21:02 | 21:24:00 | |||||||
| 5 | show | Matthieu Conjat | O- | CCD | M400 | FR | 21:19:34 | 21:23:44 | |||||||
| 6 | show | E. Frappa/A. Klotz | O- | CCD | M250 | FR | 21:21:57 | 21:25:09 | |||||||
| 7 | show | P.M. Micaletti | O- | CCD | V112 | FR | 21:21:51 | 21:24:50 |
7 observations found in db: euraster
Available (probably) matching predictions (click on the link to switch):| JPL#129 : 37eb80b0-76e7-4264-90b3-0420ec45cb34 [db: observed] |
Using prediction 37eb80b0-76e7-4264-90b3-0420ec45cb34 for map and profile fit
| Ellipse and circular profile fits to the timings (chords) |
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Auto-Fit Result: Size = 154 x 133 km a',b' = 76.9, 66.3 km X0,Y0 = -848.8, 32.9 km Mean diameter = 143 km From 3 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. |
Sky projection (artificial light) for occ. time: 2021-05-19, 21:22 UT (JD = 2459354.390)
| DAMIT | Q | P (h) | λ, β | JD0 | JD-JD0 | φ0 | Version | Modified | Vol-equiv D | Cmnt |
|---|---|---|---|---|---|---|---|---|---|---|
| # 993 | None | 11.570 | 11°, 14° | 2.436249e6 | 23105.4 | 0.0° | None | None | not scaled | 2016-01-04 |
| # 1808 | 4.0 | 11.570 | 12°, 21° | 2.436249e6 | 23105.4 | 0.0° | None | 2017-06-19 | 146.0 +/- 3.0 km | 2017-06-06 |
Image size: 300px. Transparent image background for copy & paste
| Map with groundtrack and observer stations |
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| Event Details |
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Occultation UUID [and DB] : 37eb80b0-76e7-4264-90b3-0420ec45cb34 [observed] Occultation Date + Time : 2021-05-19 at 21:20:15 UT +/- 0.01 min [1] Object Designation : (18) Melpomene Orbit Class : MBA Star Designation : GDR3 0635045514970137600 Star Coordinates (ICRF) : RA = 09 13 13.0503, DE = +17 24 14.691 [2] Star Magnitudes : G = 10.76 mag, RP = 10.08 mag, BP = 11.3 mag Object Magnitude : V = 11.48 mag Estimated Magnitude Drop : 1.2 mag Estimated Max. Duration : 6.1 sec Object Mean Diameter : 141 km (src: astorb) Speed of the shadow : 23.0 km/s Elongation to Moon & Sun : 15° (sunlit = 51%), Sun = 76° Cross-track uncertainty : 2.7 mas = 5 km = 0.04 path-width (1-sig) RUWE and duplicate source : 1.04 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#129 [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) |