Author Topic: Boyajians Star Updates And Discussion  (Read 196278 times)

Offline Star One

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Re: Boyajians Star Updates And Discussion
« Reply #1000 on: 01/13/2018 08:33 AM »
MMO = Maria Mitchell Observatory, for anyone else wondering (who hadn't clicked thru to twitter, above).

Twitter?

Offline Cinder

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Re: Boyajians Star Updates And Discussion
« Reply #1001 on: 01/13/2018 09:15 AM »
An important development I think.

Quote
Jason Wright
@Astro_Wright
Michael Castelaz finds MMO photometry supports Schaefer claim of century-long dimming of #TabbysStar
@tsboyajian
@hippke

https://mobile.twitter.com/Astro_Wright/status/951490197132337153

/tangent
The pork must flow.

Offline Mongo62

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Re: Boyajians Star Updates And Discussion
« Reply #1002 on: 01/14/2018 02:43 PM »
Posting Fredric Parker's latest update because it shows that David Lane's (one of the few observatories currently able to take measurements, due to its high northern latitude) measurements currently show an approximate 2% dimming in the V band from where it was a couple of weeks ago.

« Last Edit: 01/14/2018 02:45 PM by Mongo62 »

Offline ChrisWilson68

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Re: Boyajians Star Updates And Discussion
« Reply #1003 on: 01/14/2018 07:14 PM »
My money is currently on Bruce Gary’s solution especially now his predictions are starting to pan out.

He's been making lots of predictions, nearly all of which did not pan out.

Offline Star One

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Re: Boyajians Star Updates And Discussion
« Reply #1004 on: 01/14/2018 07:36 PM »
My money is currently on Bruce Gary’s solution especially now his predictions are starting to pan out.

He's been making lots of predictions, nearly all of which did not pan out.

Both your statements are disingenuous to Mr Gary.

Offline ChrisWilson68

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Re: Boyajians Star Updates And Discussion
« Reply #1005 on: 01/14/2018 08:16 PM »
My money is currently on Bruce Gary’s solution especially now his predictions are starting to pan out.

He's been making lots of predictions, nearly all of which did not pan out.

Both your statements are disingenuous to Mr Gary.

Huh?  Do you even know what disingenuous means?  Being disingenuous to someone means to lie to that person.  So you're literally accusing me of lying to Bruce Gary.

Anyway, I'm not lying to Bruce Gary or anyone else.

Remember Bruce Gary's "accelerating long term dimming trend"?  He predicted the star was on an exponential dimming trend and in a few years would be entirely invisible.  But the observations since then have not followed his predicted dimming trend curve.

Offline ChrisWilson68

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Re: Boyajians Star Updates And Discussion
« Reply #1006 on: 01/14/2018 08:43 PM »
Are you going to add anything constructive or just snipe at people actually trying to come up with a solution.

You claimed Bruce Gary's "predictions are starting to pan out".  I thought that was a misleading characterization of his record of predictions, so I replied stating my opinion.

That's what a discussion is -- people offering different opinions.  I thought yours was incorrect and offered a contrasting one.  Readers can make up their own minds.

In reply, you could have offered evidence to back up your opinion.  Instead, you accused me of lying and sniping, said I wasn't being constructive, and said I should leave this forum and go to Twitter.

I'll leave it as an exercise for the reader to decide which one of us is the less constructive party in this discussion.
« Last Edit: 01/14/2018 08:44 PM by ChrisWilson68 »

Offline Lar

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Re: Boyajians Star Updates And Discussion
« Reply #1007 on: 01/14/2018 10:02 PM »
Less sniping at each other please.
"I think it would be great to be born on Earth and to die on Mars. Just hopefully not at the point of impact." -Elon Musk
"We're a little bit like the dog who caught the bus" - Musk after CRS-8 S1 successfully landed on ASDS OCISLY

Offline Star One

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Boyajians Star Updates And Discussion
« Reply #1008 on: 01/14/2018 10:12 PM »
Are you going to add anything constructive or just snipe at people actually trying to come up with a solution.

You claimed Bruce Gary's "predictions are starting to pan out".  I thought that was a misleading characterization of his record of predictions, so I replied stating my opinion.

That's what a discussion is -- people offering different opinions.  I thought yours was incorrect and offered a contrasting one.  Readers can make up their own minds.

In reply, you could have offered evidence to back up your opinion.  Instead, you accused me of lying and sniping, said I wasn't being constructive, and said I should leave this forum and go to Twitter.

I'll leave it as an exercise for the reader to decide which one of us is the less constructive party in this discussion.

Read this thread about Mr Gary’s paper.

https://www.reddit.com/r/KIC8462852/comments/7fkc8t/kic_8462852_potential_repeat_of_the_kepler_day/
« Last Edit: 01/14/2018 10:13 PM by Star One »

Offline Stan-1967

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Re: Boyajians Star Updates And Discussion
« Reply #1009 on: 01/15/2018 06:02 AM »

Read this thread about Mr Gary’s paper.

https://www.reddit.com/r/KIC8462852/comments/7fkc8t/kic_8462852_potential_repeat_of_the_kepler_day/

The link to Mr. Gary's paper says they predict a RV change on the order of 1-2 km/s.  ( enormous!)  Yet the lastest update from Jason Wright's blog says that RV measurement from Keck/HiRise showed no RV change.   

I don't think it is stated if the November dip is the basis for this null result on the RV, & if B.Gary predicted an observable RV change in Oct/Nov 2017, he has had an opportunity to make that observation & report the result.

Offline Star One

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Boyajians Star Updates And Discussion
« Reply #1010 on: 01/15/2018 06:25 AM »

Read this thread about Mr Gary’s paper.

https://www.reddit.com/r/KIC8462852/comments/7fkc8t/kic_8462852_potential_repeat_of_the_kepler_day/

The link to Mr. Gary's paper says they predict a RV change on the order of 1-2 km/s.  ( enormous!)  Yet the lastest update from Jason Wright's blog says that RV measurement from Keck/HiRise showed no RV change.   

I don't think it is stated if the November dip is the basis for this null result on the RV, & if B.Gary predicted an observable RV change in Oct/Nov 2017, he has had an opportunity to make that observation & report the result.

I think there’s actually two current issues for Mr Gary one is the fact he appears to have closed his website down for updates in coordination with his inability now to observe the star so it’s unlikely we will see any response to critics/observations of his paper at this time. Second, a lot of his predictions are comparatively long term so can’t be seen to be correct or otherwise definitely for years.
« Last Edit: 01/15/2018 06:36 AM by Star One »

Offline Star One

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Boyajians Star Updates And Discussion
« Reply #1011 on: 01/17/2018 10:07 PM »
Fairly large update on the latest observations of the star from professor Boyajian.

http://www.wherestheflux.com/single-post/2018/01/17/Dip-update-130n

Also an update from Reddit on Bruce Gary.

Quote
Unfortunately Bruce was in a bad car accident recently. He escaped serious injury but needs time to recover. Hopefully his health improves in the near future.
« Last Edit: 01/17/2018 10:09 PM by Star One »

Offline Star One

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Re: Boyajians Star Updates And Discussion
« Reply #1012 on: 01/19/2018 08:41 PM »
New research update from Jason Wright.

A Reassessment of Families of Solutions to the Puzzle of Boyajian's Star

http://iopscience.iop.org/article/10.3847/2515-5172/aaa83e/meta

Offline Star One

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Re: Boyajians Star Updates And Discussion
« Reply #1013 on: 02/28/2018 03:59 PM »
Bruce Gary it appears is starting to make observations again.

http://www.brucegary.net/ts6/

Online hop

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Re: Boyajians Star Updates And Discussion
« Reply #1014 on: 03/07/2018 04:36 AM »
Paper on the MMO observations mentioned upthread

KIC 8462852: Maria Mitchell Observatory Photographic Photometry 1922 to 1991 Michael Castelaz, Thurburn Barker
Accepted for publication in the Journal of the AAVSO

Quote
A new study of the long-term photometric behavior of the the unusual star KIC 8462852 (Boyajian's Star) has been carried out using archival photographic plates from 1922-1991 taken at the Maria Mitchell Observatory (MMO). We find five episodes of sudden, several day, decreases in magnitude occurring in 1935, 1966, 1978, and two in 1980. Episodes of sudden increase in magnitude appear to occur in 1967 and 1977. Inspection of archival light curves of KIC 8462852 from two previous studies based on the Harvard and the Sonneberg plate collections finds apparent corresponding events to these observed episodes in the MMO light curve. Also, a general trend of 0.12±0.02 magnitudes per century decrease is observed in the MMO light curve, significant, but less than the trend of 0.164±0.013 observed in the Harvard light curve.

Offline as58

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Re: Boyajians Star Updates And Discussion
« Reply #1015 on: 03/12/2018 03:28 PM »
The assumed companion star does not appear to be orbiting KIC 8462852 and it may well be just a chance alignment. Abstract of https://arxiv.org/abs/1803.03299:

Quote
A faint star located 2 arcsec from KIC 8462852 was discovered in Keck 10 m adaptive optics imaging in the JHK near-infrared (NIR) in 2014 by Boyajian et al. (2016). The closeness of the star to KIC 8462852 suggested the two could constitute a binary, which might have implications for the cause of the brightness dips seen by {\it Kepler} (Boyajian et al. (2016) and in ground-based optical studies Boyajian et al. (2018). Here, NIR imaging in 2017 using the Mimir instrument resolved the pair and enabled measuring their separation. The faint star had moved 67±7 milliarcsec (mas) relative to KIC 8462852 since 2014. The relative proper motion of the faint star is 23.9±2.6 mas yr−1, for a tangential velocity of 45±5 km s−1 if it is at the same 390 pc distance as KIC 8462852. Circular velocity at the 750 AU current projected separation is 1.5 km s−1, hence the star pair cannot be bound.

Offline jebbo

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Re: Boyajians Star Updates And Discussion
« Reply #1016 on: 03/12/2018 04:12 PM »
A useful result. And hopefully, the upcoming Gaia release will tell us if it's an M2V at roughly the same distance, or a closer, later M dwarf.

--- Tony

Offline jebbo

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Re: Boyajians Star Updates And Discussion
« Reply #1017 on: 03/19/2018 04:34 PM »
It's misbehaving again ... currently about 4% down.

--- Tony

Online hop

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Re: Boyajians Star Updates And Discussion
« Reply #1018 on: 03/19/2018 06:39 PM »
Update on wtf blog http://www.wherestheflux.com/single-post/2018/03/19/tldr-DIPPING
Quote
On Friday (2018 March 16) we noted the last data taken were significantly down compared to normal. Due to poor weather conditions at all 3 sites we weren't able to observe the star again until last night...  This is the deepest dip we have observed since the Kepler Mission in 2013!  WOW!!

And from Jason Wright https://twitter.com/Astro_Wright/status/975798782414737408
Quote
Does anyone happen to have time tonight or very soon on a telescope with an IR camera? Out to 5 microns, preferably?

Asking for a friend who is @tsboyajian

Offline Star One

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Boyajians Star Updates And Discussion
« Reply #1019 on: 03/19/2018 08:02 PM »
This star is an attention seeker isn’t it starting the observing year with a bang so to speak!

https://twitter.com/tsboyajian/status/975821799060590592?s=20

Quote
OK folks, I TRIPLE DOG DARE you to show there is an IR excess.

Hopefully this much awaited main ‘body’ coming through our field of view.

Main body of dust.

A brown dwarf.

Somebody’s Dyson sphere.
« Last Edit: 03/19/2018 08:11 PM by Star One »

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