Transients in the Palomar Observatory Sky Survey

[StarfieldRep]

A $150K RFP hosted on ResearchHub will fund independent searches of other observatories' pre-Sputnik plates. It opens October 15.
Some relevant details:

Applications are required to be submitted as pre-registrations on ResearchHub.

Null and refuting results are equally eligible.

Researchers already published on the Palomar transient phenomenon are not eligible to compete.

So each study is pre-registered and searches a different archive. The RFP also asks for data and analysis code to be published openly. A null result is as eligible as a positive one. Citizen scientists can apply. If you've built your own pipeline and haven't published on the transients, you may qualify. Full eligibility rules, award sizes and deadlines will be published October 15: https://www.researchhub.com/grant/32931/coming-soon-project-lost-light

 

[Robert Sheaffer]

When I post a piece debunking a prominent UFO case (the only such piece on that case that I am aware of), I'm glad to see people concentrating on important things, like the misspelling of a foreign name.

I also misspelled "Alvan Clark" as "Alvin Clark."

Now, does anyone have any reply of substance?

 

[jarlrmai]

When I post a piece debunking a prominent UFO case (the only such piece on that case that I am aware of), I'm glad to see people concentrating on important things, like the misspelling of a foreign name.

I also misspelled "Alvan Clark" as "Alvin Clark."

Now, does anyone have any reply of substance?

The politeness of spelling someone's name correctly is of substance.

 

[NorCal Dave]

Now, does anyone have any reply of substance?

Having read your blog for years, including your recent one about the transients, as they are called, I'd respond that the over all claim made by Villarreol et.al is a bit more complex than just a red spectral class starts appearing on the red sensitive plate and not appearing onto the blue sensitive plate. While it's true they seemed to have used only digital scans of the red sensitive plates, or more likely digital scans of analog copies of the original plates, the various claims are not just that the supposed transients don't appear on the corresponding blue plates. Rather, they only appear on the scans of the plates from '50s and not on subsequent star catalogs or even in other Palomar plates from later dates. so, whether the transients appear or don't on the blue plates is irrelevant as they didn't really look at them as far as I can tell.

In addition, they make the claim that these transients are somehow related to the earths shadow. My understanding is that the claim is IF these transients represent actual physical objects in space, the original plates captured their momentary reflections. Therefore, IF they are real objects, more of them would appear out of the shadow as opposed to something like scratches and damage that would be spread across the shadow and non-shadow areas equally.

I'm in no way saying any of this is accurate and there are a number of problems identified up-thread by various members, including but not limited to, the variation in the amount of transients used for the various claims, the lack of public data and the overall complexity of the software pipeline that was used to identified the various transient datasets, which doesn't appear to have been shared. All of the supposed "reproducebility" involves various people just reusing the same data that was produced via the original pipeline.

I don't think many people outside of UFO circles are convinced these transients are even real, aside from errors, scratches and other similar defects, let alone the notion that the Palomar team unknowingly captured "alien techno-signatures".

However, IF as you describe in your blog Villarreol presented side by side scans of contemporaneous red and blue plates and suggested the transients were alien because they don't appear on the blue plates, than that's a bit different from the overall claim as I think many of us understand it. IF she did this to in effect "dumb down" the claim and make it easier to understand for a general audience in a quick news blurb, than the critique you gave is warranted.

 

[Ann K]

The politeness of spelling someone's name correctly is of substance.

It's important if you want to Google someone ...although search engines make allowances for misspellings. Otherwise, it's as important as correctly identifying the number of angels that can dance on the head of a pin. I speak as someone whose name is almost always either misspelled or mispronounced. It's not usually done "impolitely".

 

[Mendel]

It's time to end this nonsense about 'missing stars' on photographic plates being orbiting satellites.


https://badufos.blogspot.com/2026/09/about-those-orbiting-flashes-of-dr.html

The post misses the mark—existing stars are culled from the transient set—somewhat—as when it's done rigorously (Solano 2022), only 5399 features are left, not enough to work with. So Villarroel did not match against the IR catalogs this time.

While it's true they seemed to have used only digital scans of the red sensitive plates, or more likely digital scans of analog copies of the original plates, the various claims are not just that the supposed transients don't appear on the corresponding blue plates. Rather, they only appear on the scans of the plates from '50s and not on subsequent star catalogs or even in other Palomar plates from later dates. so, whether the transients appear or don't on the blue plates is irrelevant as they didn't really look at them as far as I can tell.

I've been wondering what one would find if one was to analyse the blue plates with the same methods as the red plates. I think they were not used because the exposure time is shorter? and obviously the emulsion is different, but I wonder what we'd see.