2017-08-12 / 4UC 427-103028 / (256) Walpurga
# | OBS | Observer | Occ | Meth. | Instr. | CC | TSRC | UT1 | UT2 | UT3 | UT4 | UT2E | UT3E | Dur. | Chrd |
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1 | show | E. Frappa/A. Klotz | O+ | CCD | M250 | FR | GPS++ | 22:11:44 | 22:12:25.39 | 22:12:31.06 | 22:14:57 | 0.33 | 0.22 | 5.67 | 55.0 |
2 | show | Alberto Ossola | O+ | VID | M230 | CH | GPS++ | 22:11:36 | 22:12:07.83 | 22:12:08.95 | 22:13:00 | 0.56 | 0.56 | 1.12 | 10.9 |
3 | show | Michel Bonnardeau | O- | CCD | M203 | FR | 22:11:47 | 22:12:47 | |||||||
4 | show | Andrea Manna | O- | VID | M200 | CH | 22:07:09 | 22:16:47 | |||||||
5 | show | Stefano Sposetti | O- | VID | M280 | CH | 22:07:54 | 22:16:50 |
5 observations found in db: euraster
Available (probably) matching predictions (click on the link to switch):JPL#65 : dcea6302-fff4-49dc-b5c4-107877f6ef4c [db: observed] |
Using prediction dcea6302-fff4-49dc-b5c4-107877f6ef4c for map and profile fit
Ellipse and circular profile fits to the timings (chords) |
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Auto-Fit Result: X0,Y0 = 1961.6, 24.5 km Circular diameter = 63 km From 2 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. |
Sky projection (artificial light) for occ. time: 2017-08-12, 22:11 UT (JD = 2457978.424)
DAMIT | Q | P (h) | λ, β | JD0 | JD-JD0 | φ0 | Version | Modified | Vol-equiv D | Cmnt |
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# 4071 | 1.0 | 16.660 | 220°, 73° | 2.448894e6 | 9084.4 | 0.0° | None | 2019-09-26 | not scaled | 2019-05-07 |
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] : dcea6302-fff4-49dc-b5c4-107877f6ef4c [observed] Occultation Date + Time : 2017-08-12 at 22:19:05 UT +/- 0.0 min [1] Object Designation : (256) Walpurga Orbit Class : MBA Star Designation : GDR3 4211792917852535168 Star Coordinates (ICRF) : RA = 19 20 58.6677, DE = -04 46 15.162 [2] Star Magnitudes : G = 12.35 mag, RP = 11.77 mag, BP = 12.75 mag Object Magnitude : V = 14.5 mag Estimated Magnitude Drop : 2.3 mag Estimated Max. Duration : 6.5 sec Object Mean Diameter : 63 km (src: astorb) Speed of the shadow : 9.7 km/s Elongation to Moon & Sun : 93° (sunlit = 73%), Sun = 146° Cross-track uncertainty : 0.7 mas = 1 km = 0.02 path-width (1-sig) RUWE and duplicate source : 1.04 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#65 [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) |