The Occultation of a W=8.8 star by Asteroid 2001PK24

Thur Sept 5, 2024 at 10:57pm

OWc page

This is a very bright event and I highly suggest using 1x as your setting. Kirk and Karl's places are both very close to the northern limit and if you stay there, your events may be very brief. However, the RUWE is high, so the path actually is less accurate than nominal. You're odds are probably more like 50/50 of a hit, from home. For better odds, the centerline goes through Watsonville, and even Cabrillo College is preferrable. The target is extremely close to another star of ~identical brightness, so in effect what you may see if a fat elongated single star of magnitude 8.0 which will then drop to 8.8 magnitude for up to 1.2s .

The alt=17, Az=110 in the SE. Duration 1.2s max.

Karl, you might have to move your gear to "water truck turn".

I will be in June Lake that night and not able to try this one. But it's a very bright event and I hope you go for it.

LCD chip chart

Q70 eyepiece chart

 

Results:

I did not observe this one; I was in June Lake for an athletic event. Kirk did get good data, and it looks like a miss. Karl got data too.

Kirk Bender

Looks like a miss for 2001 PK24, 1x (1/60) at the UCSC pogonip lookout. My track was just north of the blue path line, but I had to make sure to be out of the fog. I removed the focal reducer to get some separation from the nearby star. There was a lot of flicker, but the target smoothed well in pyote on the tracking star. The target was well above the background level, no apparent event. Max duration was 1.16, pyote detectability test said for my data: An event of duration 0.100 seconds with magDrop: 9.9 is likely detectable.

Looks like there was drifting haze in Kirk's sky, but still a clear miss.

 

Karl von Ahnen

Karl observed from home, apparently at 2x setting judging by the PyMovie points. However, the target was too bright to not show saturated pixels, as did the only other star on the chip, immediately above it. This compromises the photometry. However, a true event would still show easily, and clearly there was no event. A miss. Report filed by RN with IOTA 10/5/24