This event has good RUWE, but mediocre rank. However, Cabrillo Observatory is inside the shadow path and has maybe a 65% chance of a "hit". It's at the end of Astro 9ABC so I will see if I can get it from Cabrillo.
Alt=28, Az=205 in Ophiuchus.
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Zoomed in further, given the extremely high star density and the faint G magnitude size of the star here. |
Pull back, to show where to look as you position your telescope relative to horizon trees etc. Halfway from the lower left bright star of Ophiuchus and the top of the Sagittarius teapot.
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I got a recording at 8x at Cabrillo Observatory on the 8SE from the edge of the big storage building outside. Looked like a miss from playback but no reduction yet. Kirk recorded from SkyPark in Scotts Valley. Noisy, no judgment yet.
I've reduced my recording. Drift required a repositioning at 4:59:00 and so no data before 5:00:02.23 UT. I integrated at 8x, reduced in PyMovie with horizontal and vertical median filtering, used 2.4px static circular apertures on the stars, 3.2 px static circular for the 'sky' aperture.
The target was faint and the sky bright-ish at Cabrillo Observatory. The event looks like a miss. There's a single drop to zero at the event predicted time, but there are over a dozen others. At 8x setting the resolution was .17 sec per integration. The predicted event duration was 0.4 seconds, so it's most likely a miss and will be filed as a "miss" and "unsure". A 0.2s event can't be ruled out. My impression visually on play-back was also that it was a miss.
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No apparent event for 1997 CH20, 8x from Scotts Valley Skypark, this was after 2000 RX40 the same night and location, Aug. 28. There is a low point at 05:00:03, 26 seconds after predicted, but there are other low points and the curve is noisy and not much above background. OW cloud indicated nearby stars, it said the drop would only be 1.8m in an 8" radius. The PyOTE detectability tool reported an event as short as 0.94s would likely be detectable, but the max predicted was 0.43. At a radius of 4" the drop would be 3.7m, and just the target isolated would be a 5.8m drop. For both a 3.7 and a 5.8m drop, the detectability tool reported a duration as short as 0.67s would likely be detectable. The target might be too dim/noisy to tell if there was an event from my data.
