Hi TitritEL (Fatima). I refer to your very own post of Fri Jul 21 2017 to the forum, where you say:
"...every time i discover a track and see everyone else from the team clicked and we all like 35 or more on the same page! then that comment that its a fiducial mark, makes my whole day!!"
So you
had heard of them, but somehow weren't aware that, by definition, they were 'an object placed in the field of view of an imaging system which appears in the image produced, for use as a point of reference or a measure. It may be either something placed into or on the imaging subject, or a mark or set of marks in the reticule of an optical instrument.'
The word is from Latin
fiducialis and
fiducia (“trust”), from
fido (“I trust”).
Closely related, the dog name Fido means "faithful", from
"fidelitas". Apparently Abraham Lincoln had a dog named Fido, but he clearly didn't provide Abe much luck in the long run!
Your 1157902V1 does actually look like my Wow! track and therefore rather fiducial-like to me, but I could very well be wrong. Let's hope the team quickly respond to your post with their assessment, something that has unfortunately been a rarity during this project.
I certainly can't find that particular movie in the list of 'midnight' candidates here:
http://stardustathome.ssl.berkeley.edu/news/candidates/, but suspect that page hasn't been updated for quite some time.
I think the fiducials were made by needle prick in an L (or was it F) shaped north-south/west-east pattern in selected tiles, but can't at the moment find a technical reference to them on the SD@H pages. Dan &/or Mike will be able to point you in the right direction I'm sure.
Hope you continue having fun,
John