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Spectral comparison of T CrB
Dear RAC and CAS, There has been recent increase in the accretion rate of the mass transfer in the T CrB recurrent nova system that was announced recently by professional astronomers. It was detected by increased emission features in the spectrum of this star. Whether this means an eruption or outburst is imminent is uncertain. I got two hours of data on the morning of February 14, 2025. The light curve was pretty stable and looked to be at magnitude 10.2. No unusual features were detected in the curve from what I have been seeing since March of 2024 when I began intensively monitoring the star. I also was able to obtain a low resolution spectrum which also looks similar to those i have been getting all along. So from my limited ability with my amateur telescope and low resolution spectra-I have not seen any changes yet that are big enough for me to detect. I have enclosed a screen shot of two spectra-one obtained on March 20, 2024 and the other on the morning of February 14, 2025. Aside from differences in clarity ( due to seeing)-they look essential unchanged. Myron |
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Re: ATel #17030 A sudden increase of the accretion rate in T Coronae Borialis
That¡¯s good to hear. I was beginning to wonder how often a ¡°regular¡± cycle recurrent nova go off cycle. It¡¯s been a while since college astronomy, but it would make sense that over time it may take longer for the parent material star to shed enough mass for the white dwarf to go nova? I can imagine that the periods between nova eruptions could get longer and longer over time until there isn¡¯t any mass left from the parent star. That would take a good couple billion years though.?
Let¡¯s blame dust!?
BWB
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WO GT81 20th anniversary edition SVB 50mm guide Mount, ES EXOS2 PMC8 ASI 533MC Pro/ASI 533MM Pro ASI 120 MM Mini ZWO EFW7 1.25¡± Pegasus Focus Cube? Stellarmate Pro 64gb, Kstars & Ekos Astro Pixel Processor, StarNet++, Affinity Photo |
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TCrB update
Dear Astronomy friends,
Observed T Corona Borealis this morning and got about 2 hours of light curve data. The star is still in quiescence and sitting at about mag V= 10.1. The spectrum looks unchanged from my baseline in March 2024 and is consistent with that of a red giant with lots of broad absorption bands. I did not see any emission features. But again my capabilities are quite limited. I¡¯ll post the light curve once I have a chance to analyze it if it shows any changes from what I¡¯ve been seeing all along. Myron |
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Re: ATel #17030 A sudden increase of the accretion rate in T Coronae Borialis
Myron, I'm going off the usual grid for a few?days to take care of my sick daughter.? I'll have a phone, but that's it. Thanks! Pete On Wed, Feb 12, 2025 at 1:12?PM Myron Wasiuta via <myrnteryx4=[email protected]> wrote: Looks like the accretion rate is rapidly increasing! This may be it- or maybe another false start. Either way everyone should be watching this star closely. It¡¯s well up in the NE sky by morning. |
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Re: Moon
Awesome pictures of the moon, Troy!
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On Feb 8, 2025, at 8:54?AM, Troy Major via groups.io <Troymajor61@...> wrote: |
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Re: Star identification???
It's red color and proximity to Orion are the clues. Glenn D. Faini GDF Photography Private and UAS Pilot Chemical and Environmental Engineer, Retired View my photos here, on Flickr On Sat, Feb 8, 2025, 9:50 AM Claire Gardiner via <vfdirector=[email protected]> wrote:
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Re: Star identification???
Thanks Glen! I did finally find it on the app. there were so many on the app that I had no idea which one it was!? It seems so prominent in the sky, that I thought it would be easier to identify in the app!! Claire On Fri, Feb 7, 2025 at 11:53?PM Glenn D. Faini via <gdfaini=[email protected]> wrote:
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Re: Star identification???
Aldebaran Glenn D. Faini GDF Photography Private and UAS Pilot Chemical and Environmental Engineer, Retired View my photos here, on Flickr On Fri, Feb 7, 2025, 11:27 PM Claire Gardiner via <vfdirector=[email protected]> wrote:
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Astronomical League Live this Friday - February 7
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-------- Original Message --------
Subject: Astronomical League Live this Friday - February 7 Date: 2025-02-04 20:39 From: <dknabb01@...> To: "Don 01 account" <dknabb01@...> Greetings MERAL Presidents, ALCors, editors, officers, and others, Attached is a graphic announcing the next Astronomical League Live show that will be shown this Friday, February 7 at 7 p.m. EST. The main presentation is by Tom Reinert, past president of Dark Sky International. I was fortunate to hear Tom's talk last summer at Green Bank Star Quest and I enjoyed the presentation a great deal. My wife and I were camping not far from Tom and his wife, and they are wonderful people. A link to view the live stream will become active on the Astronomical League Facebook page shortly before the presentation. Here is a link to that page: Please share the information about the upcoming Astronomical League Live show with your club members. Also - we are due to hold elections for the MERAL officer positions. According to the MERAL by-laws the Chair and Vice-chair should be elected during odd numbered years and the other three positions are elected during even numbered years. Therefore, the positions open for election are Chair and Vice-chair. However, the Secretary position is currently unfilled. If anyone would like to volunteer to run for any of these three positions, please let me know. If you would like to read the MERAL by-laws that define the officer positions, please let me know and I will gladly send you a copy. Clear skies, Don Knabb MERAL Chair |
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IC 405 Flaming star Nebula
Dear RAC, OK so not the best target to go after from under mediocre skies and not shooting narrow band-but wanted to see what I could get. This image is made from 4 color channels-B,V,R, and I. The near IR band is the deep rd and picks up some very obscured objects-particularly the deep red star on the left. Thers also a reddish fuzzy object near the bottom right-a background galaxy perhaps, or maybe just a nebular condensation. Ill look into this more but wanted to share this image. Its 25 minutes in each band-so not near enough exposure time. I used the MSRO/RAC 10" RC and QHY 294 M Pro cmos camera. Myron |
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Re: NGC4565 - The Needle Galaxy
¿ªÔÆÌåÓý? Wade that¡¯s beautiful! I really like how the needle tapers from yellow to blue as the density of Population II stars in the nucleus gives way to younger Population I stars in the spiral arms.? Myron On Feb 2, 2025, at 3:43?PM, Troy Major via groups.io <Troymajor61@...> wrote:
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Myron Wasiuta
Brian Barbre
Peter Laky
Wade Allen
Glenn D. Faini
