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hoys.bsky.social
HOYS
@hoys.bsky.social
75 followers 34 following 84 posts
HUNTING OUTBURSTING YOUNG STARS
The HOYS citizen science project works with amateur astronomers on long-term photometric monitoring of young stellar clusters to find outbursting and other interesting objects.
https://hoys.space/
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hoys.bsky.social
hoys.space/lightcurve-o... 🔭
Lightcurve of the week 345 - HOYS Citizen Science
This week we look again at a non-YSO variable. It is the Mira type star KS Cyg, which is situated in the MWSC3274 target region. We showed some V-band data of this source in week 116. In the above pl...
hoys.space
August 20, 2025 at 6:12 PM
hoys.bsky.social
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Lightcurve of the week 344 - HOYS Citizen Science
The last time we looked at the light curve of this object, was in week 26. This was pre having the HOYS website, when the posts where exclusively placed on the Facebook Group. The source is a backgrou...
hoys.space
August 20, 2025 at 6:12 PM
hoys.bsky.social
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Lightcurve of the week 343 - HOYS Citizen Science
We look at another 'simulation' plot this week :-) What if you had a forming protoplanet close to a young star and this planet accretes material? This means a large fraction of the volume around the ...
hoys.space
August 20, 2025 at 6:12 PM
hoys.bsky.social
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Lightcurve of the week 342 - HOYS Citizen Science
We have a look at some items related to spots on young stars this week. The properties (size and temperature) of these spots are determined from amplitudes in periodic light curves in various filters....
hoys.space
August 1, 2025 at 6:22 PM
hoys.bsky.social
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Lightcurve of the week 341 - HOYS Citizen Science
This week we have  look at the light curve of the young star Mayrit 789281. It is located in the sigma-Ori target region of HOYS. This field has very good coverage in the last 5yr. We show the long t...
hoys.space
August 1, 2025 at 6:22 PM
hoys.bsky.social
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Lightcurve of the week 340 - HOYS Citizen Science
The plot above looks like the usual spot induced periodic light curve of a young star. But it is not :-) . We show the light curve for the star BS Vel. It is actually a nearby star (distance 181pc) w...
hoys.space
August 1, 2025 at 6:21 PM
hoys.bsky.social
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Lightcurve of the week 339 - HOYS Citizen Science
This week we look at V608Mon, a T-Tauri star near the Cone Nebula in the target region NGC2264. The last time we looked at this source was in week 286, about one year ago. In images the object is sur...
hoys.space
August 1, 2025 at 6:21 PM
hoys.bsky.social
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Lightcurve of the week 338 - HOYS Citizen Science
This week we revisit the light curve for the star 2MASS J20522802+4403311. We looked at it about one year ago in week 282 and found it to be an Orion type variable. These are objects whose variations ...
hoys.space
August 1, 2025 at 6:21 PM
hoys.bsky.social
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Lightcurve of the week 337 - HOYS Citizen Science
This week we have a look at the HOYS data for the star RW Ori. It is in the well observed Sigma Ori target region of the project. towards the end of 2023 we had a look at this object during weeks 254 ...
hoys.space
June 27, 2025 at 9:10 PM
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Lightcurve of the week 336 - HOYS Citizen Science
If you’ve been following our updates, you’ll know we often talk about starspots on the surfaces of young stars. These spots are responsible for the periodic dips and rises we see in their light curves...
hoys.space
June 20, 2025 at 5:48 PM
hoys.bsky.social
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Lightcurve of the week 335 - HOYS Citizen Science
This week, we turn our attention once again to a familiar and intriguing object in our project: the young star GM Cep in the IC 1396A target field. We last reported on it back in Week 299, when the st...
hoys.space
June 15, 2025 at 11:12 AM
hoys.bsky.social
We are back with our HOYS-LCO program for next Winter (2025/26). If you want to get your pupils involved apply now on the website: hoys.space/lco-project/
Please share this if you have any teacher contacts that might be interested. 🔭
LCO PROJECT - HOYS Citizen Science
LCO PROJECT YEAR 6 Our project as a Global Sky Partner of Las Cumbres Observatory, this time for school teachers and their students. Join and gather data using these telescopes for the HOYS project...
hoys.space
June 9, 2025 at 6:35 PM
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Lightcurve of the week 334 - HOYS Citizen Science
We revisit the variable star V350Cep in NGC7129 this week - an old friend of the project. The last time we looked at it was about 6 months ago in week 309. The object is a suspected FU Ori outburstin...
hoys.space
June 6, 2025 at 10:39 AM
hoys.bsky.social
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Lightcurve of the week 333 - HOYS Citizen Science
We have not had a look at one of our "old friends" NSW284 for quite a while. The last time we looked at it was in week 257, about 1.5yr ago. This object was the first Be type outburst star we accident...
hoys.space
May 30, 2025 at 9:46 PM
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Lightcurve of the week 332 - HOYS Citizen Science
"Not V2492Cyg again!" ... is what the regular reader of these posts might shout. I know! But this one is special, and a follow up on the post from week 316 in January. The plot is a screenshot from a ...
hoys.space
May 24, 2025 at 1:20 PM
hoys.bsky.social
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Lightcurve of the week 331 - HOYS Citizen Science
We have a look at a light curve from the Lambda-Ori target region this week. This field, which is centred on the cluster also known as Collinder 69, or MWSC 0580, is one of the lesser observed targets...
hoys.space
May 18, 2025 at 9:00 PM
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Lightcurve of the week 330 - HOYS Citizen Science
This weeks light curve does not look very interesting. But it is :-) We show the R and I-band data for the last two years for the star Cl* IC 348 LRL 237. It is situated in the IC348 target region in...
hoys.space
May 8, 2025 at 3:11 PM
hoys.bsky.social
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Lightcurve of the week 329 - HOYS Citizen Science
Sometimes you are analysing your data to find out something about it, and while contemplating your results you realise that you answered another question, much more interesting than the one you had in...
hoys.space
May 1, 2025 at 7:29 PM
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Lightcurve of the week 328 - HOYS Citizen Science
Please enjoy this picture while I am on a break. We are back with interesting light curves next week :-) Apologies - I forgot to post this last week ....
hoys.space
April 29, 2025 at 8:34 PM
hoys.bsky.social
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Lightcurve of the week 327 - HOYS Citizen Science
We return to an old friend of the project this week. The young star V1490Cyg in the Pelican Nebula. The star has been the subject of one of our first papers, and we subsequently looked at its light cu...
hoys.space
April 29, 2025 at 8:33 PM
hoys.bsky.social
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Lightcurve of the week 326 - HOYS Citizen Science
This week we look at the light curve of the young star V1787Ori in the L1641N target region. We have looked at parts of the light curve for this object several times, for example in weeks 98, 201, 202...
hoys.space
April 29, 2025 at 8:33 PM
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Lightcurve of the week 325 - HOYS Citizen Science
In week 110 (more than 4 years ago) we had a look at the star BL Vel, which is situated in the southern HOYS field of Gaia19eyy. Back then we found that on occasion the star shows periodic variability...
hoys.space
April 7, 2025 at 2:39 PM
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Lightcurve of the week 324 - HOYS Citizen Science
We have a look at the V, R, and I-band photometry for the star T-Ori this week. We only show the data from the last observing season, i.e. the winter of 2024/25. The star is placed near a bright filam...
hoys.space
March 28, 2025 at 11:30 AM
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Lightcurve of the week 323 - HOYS Citizen Science
This week we look at the light curve of the variable star GQ Mon. It is situated in the NGC2264 target region and classified as a T Tauri star. We have now nine observing seasons worth of data - but ...
hoys.space
March 20, 2025 at 8:00 PM
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Lightcurve of the week 322 - HOYS Citizen Science
We are back looking at a light curve this week. The image above shows the V, R, and I-band data we have for the star V594Ori. It is situated to the South East of the Orion Nebula in the L1641N target ...
hoys.space
March 20, 2025 at 8:00 PM