This is a high value and quite observable event, and deserves high participation! The star is bright, the event is long at 1.2s and the asteroid is a GaiaMoons asteroid and has a likely moon which needs to be discovered, by perhaps us! The main object path misses Santa Cruz, but hits Karl and the SC Mtns. The event is Monday night after my Astro 3-2 class. I will need to leave for the event from Cabrillo College shortly after 9pm when class lets out.
My chosen observing site is the Lexington Dam in Los Gatos. Google Maps in the evening says it takes about 27 minutes to get from Cabrillo to Lexington Dam on a Friday night. If I can start the engine at 9:15pm, that means arrival by 9:45pm, leaving 1hr 15min before the event. Plenty of time.
Alt=23, Az=227 in Scutum. 10 deg to the right of the bright stars of the "Teaspoon"
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Observation data should be sent to: https://occultation.trgozlemevleri.gov.tr/create_report/2404/
Bernard H had to bail as fog came in.
Jordan Brown - Astro 9 student - was very excited to join the trip and learn how to do these events. She carpooled with me, as we set up on Lexington Resevoir dam in Los Gatos and had a definite short event at 1x integration. Estimated by eye at 0.7s. Successfully recorded on my Lenovo laptop. Use 2.4px static circular mask. field mode. At the telescope, I adjusted the recording brightness to keep sky noise to a minimum and contrast in the middle or just above. Nothing extreme, which I think amplifies noise.
magDrop report: percentDrop: 89.1 magDrop: 2.402 +/- 0.508 (0.95 ci)
DNR: 1.98
D time: [06:00:26.4311]
D: 0.6800 containment intervals: {+/- 0.0081} seconds
D: 0.9500 containment intervals: {+/- 0.0277} seconds
D: 0.9973 containment intervals: {+/- 0.0898} seconds
R time: [06:00:27.3111]
R: 0.6800 containment intervals: {+/- 0.0081} seconds
R: 0.9500 containment intervals: {+/- 0.0277} seconds
R: 0.9973 containment intervals: {+/- 0.0898} seconds
Duration (R - D): 0.8800 seconds
Duration: 0.6800 containment intervals: {+/- 0.0127} seconds
Duration: 0.9500 containment intervals: {+/- 0.0359} seconds
Duration: 0.9973 containment intervals: {+/- 0.0927} seconds
I recorded at 1x, once again had to do manual time stamps, even though this time the sky was quite dark. I don't know why PyOTE is unable to OCR my numerals. But, the event was easily found and good solid accuracy. I searched for any hint of a satellite. There was one other place with 3 consecutive zero points, but rather later than one would expect. I'll mention it in my IOTA report.
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Solid main body event. |
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The best prospect for a moonlet, is this 3-field drop to zero. But at 1x this is too noisy to qualify as a detection for PyOTE. |
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For MPC I got a 0.7841s event from Laurel road, 1x. I recorded for 3 minutes before and after. No sign of a secondary event in the noise. I had 3 bad time stamps but they were away from the event. I'll post my data on the Lucky Star occultation portal soon, I took dark frames that night, and twilight flat frames the evening after.
magDrop report: percentDrop: 85.5 magDrop: 2.100 +/- 0.447 (0.95 ci)
DNR: 2.25
D time: [06:00:27.3472]
D: 0.6800 containment intervals: {+/- 0.0069} seconds
D: 0.9500 containment intervals: {+/- 0.0240} seconds
D: 0.9973 containment intervals: {+/- 0.0770} seconds
R time: [06:00:28.1313]
R: 0.6800 containment intervals: {+/- 0.0069} seconds
R: 0.9500 containment intervals: {+/- 0.0240} seconds
R: 0.9973 containment intervals: {+/- 0.0770} seconds
Duration (R - D): 0.7841 seconds
Duration: 0.6800 containment intervals: {+/- 0.0110} seconds
Duration: 0.9500 containment intervals: {+/- 0.0337} seconds
Duration: 0.9973 containment intervals: {+/- 0.0863} seconds
got a positive on the main body. Will look more carefully at the time of my (unlikely) secondary drop before finalizing his report.
