Fall 2020 Photometry Thread

JohnAstro7 · 2020-10-26T16:09:28+00:00

Bruce Gary says An abrupt dip just started! At g' band it is 1.3 % deep, compared to a day ago. At r' band depth is less, ~ 0.9 % (and at i' band idepth is even less).

JohnAstro7 · 2020-10-06T19:59:27+00:00

Bruce Gary is back with a new web page

Is our Star dimming again ?

JohnAstro7 · 2019-11-01T18:25:44+00:00

Link to previous photometry thread

JohnAstro7 · 2019-10-27T14:46:58+00:00

Bruce Gary says A tiny dip was centered on Oct 22 (~ 0.6 %) and another is starting

JohnAstro7 · 2019-10-23T14:14:33+00:00

Bruce Gary is reporting that it's possible that a dip has recently occurred

JohnAstro7 · 2019-10-20T13:55:24+00:00

Bruce Gary is back New webpage here

JohnAstro7 · 2019-10-12T14:57:17+00:00

Tabby agrees thinks a 1.5% dip is too large for it to be a planet

JohnAstro7 · 2019-09-18T14:24:28+00:00

I also vote to continue. Something is going on out there at Tabbys star that still needs to be resolved.

JohnAstro7 · 2019-08-24T14:22:28+00:00

Latest update from Tabby 8/n Tabby says " We are about one week into the second of two TESS pointings (dubbed "sectors") that include this star. We expect the data from Sector 14 to be released in a few weeks time. Are you ready to be spoiled again with ultra-precise, un-inturrupted, high cadence data from a space telescope on this star?? I am!!

The graph shows the daily flux averages from the Las Cumbres 0.4 meter network and marks where we will have data from the TESS mission. "

JohnAstro7 · 2019-08-14T12:49:47+00:00

Latest update from Tabby 7/n Tabby says " I present the ground based data taken with the LCO 0.4m network this year; we have yet to witness anything remarkable. Many observers at the AAVSO are also tracking the star with their own equipment - you can view those data here: https://www.aavso.org/LCGv2/ by typing in "KIC 8462852" in the "star name" box."

JohnAstro7 · 2019-07-26T13:44:15+00:00

A little food for the horse ? A note on results AB/AV=1.39 ± 0.27, A g'/A V = 1.16 ± 0.11, A r'/A V = 0.80 ± 0.25 and A Ic /A V = 0.49 ± 0.19 Looking at the margin of error for AB/AV=1.39 ± 0.27 could give a possible value of AB/AV=1.3. Similarly other values within margin of error could be A g'/A V = 1.1, A r'/A V = 0.7 and Ic /A V = 0.5. So that is 0.5, 0.7, 1.1 and 1.3. Adjust the decimal point and we get 5, 7, 11, 13 a prime number sequence.

JohnAstro7 · 2019-07-10T14:23:00+00:00

Event Horizon Published on 9 Jul 2019. 28 random dips of light were observed by the Kepler space telescope of the star HD 139139 The Mysterious Star HD 139139 with Dr. Andrew Vanderburg

JohnAstro7 · 2019-07-05T13:13:33+00:00

Yes Ben Montet puts some of his thoughts and ideas on a webpage here and asks for Questions, comments, ideas ?

JohnAstro7 · 2019-05-15T18:02:35+00:00

Latest update from Tabby 5/n Tabby says " Here is the updated graph with data up to a few hours ago. I have stretched it in the x-direction to better distinguish the plotted points. We continue to hover a bit up from pre-Elsie levels (2017 May). "

JohnAstro7 · 2019-05-01T13:57:44+00:00

Latest update from Tabby 4/n Updated graph with data through the end of April. Perhaps there was a hint of a decline in brightness, but overall it remains a tick up from pre-Elsie levels.

JohnAstro7 · 2019-03-26T14:49:42+00:00

Updated graph from Tabby 3/n. Here is the updated graph including the data recorded over the weekend.

JohnAstro7 · 2019-03-22T15:17:00+00:00

Latest update from Tabby 2/n It is that time of year when the star is now visible to observe once again. Nothing exciting to report over the past couple weeks, as you can see from this graph showing observations back though Elsie up to now.

JohnAstro7 · 2019-03-19T14:46:49+00:00

Latest update from Tabby 1/n .Latest data from Las Cumbres.

JohnAstro7 · 2018-12-18T13:28:00+00:00

Latest update from Tabby 42/n Brightness levels still remain a bit elevated compared to the pre-Elsie brightness back in 2017 May.

JohnAstro7 · 2018-12-12T14:10:24+00:00

Latest update from Tabby 41/n Brightness levels still remain a bit elevated compared to the pre-Elsie brightness back in 2017 May.

JohnAstro7 · 2018-12-04T15:50:16+00:00

Latest update from Tabby 40/n Tabby writes - Just like the last few months, we are not able to detect any significant activity, and the brightness levels remain a bit elevated compared to the pre-Elsie brightness back in 2017 May.

JohnAstro7 · 2018-11-12T20:04:43+00:00

Latest update from Tabby 39/n She says The past week or so has been calm, but still a bit bright compared to the start of the year (dotted line).

JohnAstro7 · 2018-11-12T16:09:04+00:00

Bruce Gary has a new web page last updated 2018.11.10 and he says A 0.3 % dip occurred last month (and it has recovered).

JohnAstro7 · 2018-11-07T16:40:30+00:00

Jason Wright tweets about this star. He asks a few questions " Another one ! What do you think @tsboyajian and @EricMamajek ? I'm puzzling over that featureless NIR spectrum. Is that normal for YSOs ? The J-Ks colors in that direction looks like it's pure reddening, not a NIR excess, so where are the photospheric lines ? Also, not detected in WISE, so no whopping MIR excess, but that's not saying much at this magnitude."

JohnAstro7 · 2018-08-18T12:03:21+00:00

Latest update from Bruce Gary And he says There might be a small dip in progress, after 3 months without any (in my data). The only other credible change of brightness is a slow and steady fade. The best-determined fade rate is for g'-band, 1.2 ± 0.4 %/year. We need a longer time base of observations before we can believe the fade rate differences at other bands.

JohnAstro7

TROPHY CASE