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alanjgreen

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alanjgreen last won the day on January 17 2019

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About alanjgreen

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    Brown Dwarf

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    Cumbria. UK

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  1. This morning I observed SNAT2021J in NGC4414 and it is bright! (now listed as 13.2) Here is my observing sketch: I was using the 20" Dob and Televue EPs connected to PVS-14 NVD. This supernova was immediately seen in both the 27mm (x77 magnification) and 18.2mm (x111 magnification) TeleVue EPs. I also tried with the Televue 67mm eyepiece (at a miniscule x31 magnification) and I could still just make out the SN even at this low magnification! I marked a few stars on my diagram - star "G" was about the same brightness as the SN. I know you may not have a NVD but at
  2. Just ordered the new version of the TNVC Televue adapter to connect PVS-14 to Televue eyepieces from FLO. https://www.firstlightoptics.com/tele-vue-eyepieces/tele-vue-tnv-14-eyepiece-adapter.html The image shows the original 15mm aperture connector but Grant opened a box and confirmed that they are the new 22mm aperture version! They also have the 67mm converter lens for the 55mm plossl in stock too... https://www.firstlightoptics.com/tele-vue-eyepieces/tele-vue-67mm-converter-for-55mm-plssl.html Saves paying to import from the USA. Alan
  3. The 55mm plossl did not perform well when used with a fast telescope, my f3.6 dob for example. Early adopters are saying this new lens fixes all the issues with the eyepiece for fast scopes. Night vision devices only show 40 degree afov anyway so why not increase the focal length at the same time and allow a wider exit pupil too. It now lets 20% more light through the eyepiece than the vanilla plossl (as an added bonus). Alan
  4. Here is a humble Televue 55mm Plossl (my most used eyepiece). It has its flaws and Televue have been listening to their customers and have been working to improve the eyepiece and also to increase the focal length to the maximum possible and still provide a 40 degree afov. Here is the new Televue 67mm conversion kit... Remove the screw top from the 55mm Plossl... Screw in the new 67mm conversion lens (using the inner thread of the top)... Replace the screw top of the 55mm Plossl... It still looks like a 55mm Plossl, but it is now a
  5. Steve, Congrats on your purchases You won’t be disappointed with your 2100 FOM setup that’s for sure! 1. Get a Televue 55mm plossl and the new Televue 67mm converter (fits inside the 55mm plossl ) - that they designed for night vision users - ordered then you are good to go... http://www.televue.com/engine/TV3b_page.asp?id=36 https://www.cloudynights.com/topic/711777-67mm-fl-conversion-lens-for-televue-55mm-plossl/ 2. I use a Baader 610nm red filter to filter out the moon (when I am not using the Ha filter) https://www.firstlightoptics.com/baader-filters/baader-colour
  6. I have an Astrosystems Dob cover imported from USA https://www.astrosystems.biz/covers.htm I went for the 20” f5 cover and it’s way too big for the f3.6!! but better too large and the shed has a dessicant dehumidifier that runs three hours a day https://www.airconcentre.co.uk/products/ecoair-dd1-simple-desiccant-dehumidifier-ecodd122sim?variant=15428686381154&currency=GBP&utm_source=google&utm_medium=cpc&utm_campaign=google+shopping&gclid=EAIaIQobChMIo6ez7vKr6QIVxLHtCh2XtA_TEAYYAiABEgJ1w_D_BwE - the dessicant versions work at lower
  7. Date: Sunday 10th May 2020. 2240-0130hrs Scope: 20” f3.6 Lukehurst Dob with Paracorr (fl = 2089mm & f4.1). Night Vision: PVS-14 with Photonis 4g INTENS. Eyepieces: Plossl 55mm (f2 x38), Panoptic 35mm (f3 x60), Panoptic 27mm (f4 x77), DeLite 18.2mm (f5.8 x115). Introduction I had made a plan to attempt five supernovae earlier in the day and had drawn some star charts to match against once I had the target galaxy in the fov. The weather gods were on my side yesterday and I managed to get an immediate opportunity to search for the SN last night...
  8. Here are my SN targets for next week (weather permitting)... 1.NGC 3643, SN2020hvf, Mag 12.4 (observed on 27th April & 8th May) http://www.rochesterastronomy.org/supernova.html?#2020hvf 2.M61, SN2020jfo, Mag 14.5 (observed on 8th May) http://www.rochesterastronomy.org/supernova.html?#2020jfo 3.NGC 6118, SN2020hvp, Mag 14.6 http://www.rochesterastronomy.org/supernova.html?#2020hvp 4.UGC 10561, SN2020hvq, Mag 15.9 http://www.rochesterastronomy.org/supernova.html?#2020hvq 5.PGC 056685, SN2020fhs, Mag 16.1 http://www.rochest
  9. I was on a mission last night (to bag the SN in M61 before the rise of the Devils Orb due around 2300). I went outside at 2215 to get setup and was so disappointed to see that it was still dusk. Only the few brightest stars were visible naked eye (but at least I could complete 2-star alignment). By 2235 I was setup (with the 20" and NV setup) and nudged over to M100 for a test with the 55mm Plossl. M100 was just about visible so I felt a little deflated (but it is very large and surface brightness is lower) so I nudged down to M61 and SN2020jfo... To my surprise the supernova was eas
  10. I observed 2020hvf in NGC3643 on 28th April. It is very bright and obvious. It was mag 14.9 back then. (rotate by 180 degrees to match the view from a dob) There is also a new SN in M61 (2020jfo) which was mag 14.6 when discovered 2 days ago. It will get much brighter over the next 10 days. Should be even easier that 2020hvf. See Alan
  11. Mark, You should also have a crack at SN2020hvf in NGC3643 . I observed it on 28th April and it was bright and easy. It has brightened further to mag 13.0 now. Here are the links: http://www.rochesterastronomy.org/sn2020/sn2020hvf.html (rotate this image 180 degrees to match the view to a dob!). Alan
  12. Type II supernova found in M61 on 6th May. http://www.rochesterastronomy.org/supernova.html#2020jfo link to image stated as mag 14.6 already, will get much brighter... happy hunting next week! Alan
  13. New supernovae target in NGC3643 named 2020hvf discovered 21/4/20. Brightness is now reported at mag 14.4 Image here Good luck, Alan
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