Posts by Jon Golding

1) Message boards : SETI@home Science : Observations at the Allen Telescope Array Interrupted (Message 1889711)
Posted 14 Sep 2017 by Profile Jon Golding
Post:
There are various posts/analyses/conspiracies concerning the content of the recent FRBs.
Some fun signal processing has been done here https://www.youtube.com/watch?v=uDTXtXARxfA
and here https://www.youtube.com/watch?v=XBEQXgUyR2c
I have no idea whether these posts are 'genuine', but the source data files are available from a repository at Harvard https://dataverse.harvard.edu/dataset.xhtml?persistentId=doi:10.7910/DVN/QSWJE6
Breakthrough Listen state that an analysis of the latest FRBs will be the subject of a forthcoming paper http://www.breakthroughinitiatives.org/News/13
2) Message boards : SETI@home Science : Observations at the Allen Telescope Array Interrupted (Message 1889500)
Posted 13 Sep 2017 by Profile Jon Golding
Post:
What target were they observing before the "information blackout" and did they linger on this target more than usual?
It's most likely a glitch in the system somewhere...... probably.....
3) Message boards : Nebula : My comments on top multiplets (Message 1889395)
Posted 12 Sep 2017 by Profile Jon Golding
Post:
Many of the top scoring 200 pixels are from one of two regions: ~21.5 RA, ~10.1 Dec; or 5.4-5.5 RA, 28.5-29.5 Dec.
Any specific reasons for this? Are these directions more likely to be affected by RFI from local RADAR, or known communications satellites?
Alternatively, are there any nearby stars within these pixels with planetary systems?
4) Message boards : SETI@home Science : FRB 121102 Intense Burst of 15 Weird Signals (Message 1887860)
Posted 4 Sep 2017 by Profile Jon Golding
Post:
Perhaps clumps of material are falling onto the magnetar and generating the bursts, or some other chaotic process that gives irregular bursts of activity?
If it was instead an ETI beacon, you might expect it to have a more regular output.
5) Message boards : SETI@home Science : The Most Mysterious Star in the Galaxy (Message 1885659)
Posted 23 Aug 2017 by Profile Jon Golding
Post:
A planet that big and close to its parent star should also impart a wobble in the star's orbit, leading to a Doppler shift in the star's light. I'm not aware that any such Doppler shift has been detected for KIC8462852.
6) Message boards : Nebula : Drifting RFI: one more round (Message 1883990)
Posted 15 Aug 2017 by Profile Jon Golding
Post:
Great news that the data analysis is nearly complete.
Do these multiplets with large numbers of spikes all come from the same region of the sky and are they reproducible over several observing sessions, or is this more likely to be a single burst of noise (radar?)
7) Message boards : Nebula : Chirp rate and scoring (Message 1871251)
Posted 5 Jun 2017 by Profile Jon Golding
Post:
Presumably, this would also filter out multi-planet systems, sending messages between their planets? The chirp rates would differ for each planet in the system.
8) Message boards : Nebula : Progress, and basic changes (Message 1866229)
Posted 8 May 2017 by Profile Jon Golding
Post:
So, in conclusion, have the recent code changes resulted in a system that's more efficient and less error-prone?
Is Nebula now ready for routine use, and can you estimate on how long it will take to process all the SETI@home result files?
Many thanks for all your hard work on this.
9) Message boards : News : Free Speech and SETI@home (Message 1864380)
Posted 28 Apr 2017 by Profile Jon Golding
Post:
Agreed. Politics and trolling should not be appearing in a SETI News thread.
This is the kind of information we ought to be focussing on in SETI News:
http://breakthroughinitiatives.org/News/10
http://www.sci-news.com/astronomy/breakthrough-listen-results-04799.html
https://seti.berkeley.edu/lband2017/index.html
10) Message boards : Nebula : Using Nebula for SERENDIP (Message 1857389)
Posted 24 Mar 2017 by Profile Jon Golding
Post:
Are there any plans to include Optical SETI data with the pixel information?
It would be great to have a very broad spectrum associated with each sky coordinate pixel. Obviously, a pixel would become very interesting if it scored highly for SETI, SETENDIP and OSETI.
11) Message boards : Nebula : Barycentric correction corrected (Message 1841842)
Posted 13 Jan 2017 by Profile Jon Golding
Post:
What data throughput are you achieving now? In a separate thread you talked about scoring 1 million pixels, but it sounded like the processing rate was slower than desired.
Any estimates on how long it now takes to process a fixed number of results and whether further optimisation is needed or being implemented?
12) Message boards : Nebula : Drifting RFI (Message 1833912)
Posted 3 Dec 2016 by Profile Jon Golding
Post:
Presumably, the only way to demonstrate that this is really RFI, is to check if the same drifting signal was detected simultaneously in some of the other 6 beams?
13) Message boards : News : "Baffling" "signal" "from HD 164595" is probably none of the above. (Message 1818721)
Posted 21 Sep 2016 by Profile Jon Golding
Post:
Any government would probably jump at the chance to announce the first discovery of an alien civilisation.
1) imagine the bragging rights they'd get from that
2) it would distract attention from all the geopolitical mess that humans have got themselves into
14) Message boards : SETI@home Science : The Most Mysterious Star in the Galaxy (Message 1790516)
Posted 26 May 2016 by Profile Jon Golding
Post:
Another strange dip in brightness can be seen in the B-filter data on May 23rd. However, it's perhaps worth noting that all of these unexplained dips were recorded by the same observer (PXR).
15) Message boards : SETI@home Science : Have the Chinese been approached about FAST? (Message 1790059)
Posted 24 May 2016 by Profile Jon Golding
Post:
Recent article by the BBC reports on the final stages of construction of FAST http://www.bbc.co.uk/news/magazine-36336006
16) Message boards : SETI@home Science : The Most Mysterious Star in the Galaxy (Message 1790016)
Posted 24 May 2016 by Profile Jon Golding
Post:
If you select the option to display 'discrepant' data, then you can see the points that have been manually removed
17) Message boards : SETI@home Science : KIC 8462852 dimming events (Message 1787057)
Posted 12 May 2016 by Profile Jon Golding
Post:
Here's the plot showing the dip in brightness in the context of the (usually) steady brightness of around 11.8 - 11.9 mag.
I've taken the raw data from https://www.aavso.org/apps/webobs/results/?star=KIC+8462852&page=21 and made a plot of the dimming event. The entire dimming event lasts around 2 hr and is made up of a series of rapid dips in brightness. This would appear to fit with a cluster of objects rapidly moving across the face of the star (comets?)

18) Message boards : SETI@home Science : KIC 8462852 dimming events (Message 1786241)
Posted 9 May 2016 by Profile Jon Golding
Post:
Wow! That's a huge reduction in brightness. Even bigger than the largest 20% dip reported (https://arxiv.org/abs/1509.03622)
19) Message boards : SETI@home Science : KIC 8462852 dimming events (Message 1786158)
Posted 9 May 2016 by Profile Jon Golding
Post:
Seems that the series of observations showing a possible transit were all recorded by the same observer, so the results could be explained by a technical problem or local atmospheric effect that day. Going back to the original paper on KIC 8462852, some of those dimming events happened in clusters, so there may be more along anytime soon now. Hopefully someone can get a spectrum of the star during a dimming event and that might yield some clues as to what (or who!) is doing this.
20) Message boards : SETI@home Science : KIC 8462852 dimming events (Message 1786118)
Posted 9 May 2016 by Profile Jon Golding
Post:
Seems like there was a recent dimming of KIC 8462852 (Tabby's star), as monitored by the American Association of Variable Star Observers. https://www.aavso.org/lcg
Is this star planned to be included in the Breakthrough targeted search when Parkes telescope data becomes available?


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