Our Picks
Top content from across the community, hand-picked by us.
EP18 - Sunday, 6th September 2020 7:30pm BST - Dark Art or Magic Bullet? by Steve Richards
Grant posted a topic in StarGaZine,
This is a follow-on to the ‘Finish’ section from his original ‘Making Every Photon Count’ talk and is aimed at beginners to the dark art of image processing. The aim will be to show a complete processing workflow to produce an LRGB image of the Whirlpool Galaxy, M51. The following topics will be discussed:-
Data Preparation
Bias/Dark/Flat Frame Calibration
Image Alignment
Image Stacking
Initial Stretching
Combining Red, Green and Blue Data
Removing Light Pollution
Levels Adjustment
Curves Adjustment
Saturation Adjustment
Adding Luminance Data
Increasing Colour Saturation (PhotoShop Action available to download)
Final Colour Balance Adjustment
Sharpening (PhotoShop Action available to download)
Demonstrating the contribution of the Luminance Data
Links to Software Downloads:
FITS Liberator Version 2.3
Deep Sky Stacker (DSS)
Stargazine Actions.atn
Meeting details below:
Topic: EP18 - Sunday, 6th September 2020 7:30pm BST - Dark Art or Magic Bullet? by Steve Richards
Time: Sep 6, 2020 07:30 PM London
Join Zoom Meeting
https://zoom.us/j/93254088501?pwd=K0lDa2w5NktnMTc3ZVkvUUpTSEg3QT09
Meeting ID: 932 5408 8501
Passcode: 939401
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- 12 replies
EP17 - Sunday, 30th August 2020 7:30pm BST - An overview of N.I.N.A. - Nighttime Imaging 'N' Astronomy by Stefan Berg
Grant posted a topic in StarGaZine,
It is a software designed for all deep sky object imagers. Whether you're new to the world of DSO imaging or an experienced veteran, this project's goal is to make your image capture easier, faster, and more convenient.
You can find our more information and download N.I.N.A from here: https://nighttime-imaging.eu/
Stefan will be giving us an introduction and overview of the software 🙂
Meeting details below:
Topic: EP17 - Sunday, 30th August 2020 7:30pm BST - An overview of N.I.N.A. - Nighttime Imaging 'N' Astronomy by Stefan Berg
Time: Aug 30, 2020 07:30 PM London
Join Zoom Meeting
https://zoom.us/j/94026841093?pwd=allHblhuY25DUU1sWVBobm1yNUZEZz09
Meeting ID: 940 2684 1093
Passcode: 979003
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- 10 replies
EP16 - Sunday, 23rd August 2020 7:30pm BST - ARIEL and ExoClock by Anastasia Kokori
Grant posted a topic in StarGaZine,
Anastasia is also the Astrographic Officer at Greenwich Royal Observatory and also a planetary scientist in training at Birkbeck University of London. She is a graduate of the Space Studies Program (SSP) 2018, organised by the International Space University (ISU), and also holds an MSc in Science Communication from Dublin City University (DCU), and a Primary Education Degree from the Aristotle University of Thessaloniki. She has a long experience in observing with small ground-based telescopes and also organising projects and events that involve the public and school students.
Talk Synopsis:
ARIEL is a space mission led by the European Space Agency, planned to launch in 2028. It will be the first dedicated mission to measure the chemical composition of many exoplanets. The main objective of ARIEL is to study in detail a large diverse sample of exoplanets orbiting different types of stars. The key science questions ARIEL will address are:
• What are exoplanets made of?
• How do planets and planetary systems form?
• How do planets and their atmospheres evolve over time?
Understanding worlds beyond the Earth is a key issue for humanity and it concerns everyone, not only the scientific communities. We strongly believe that research and science is an effort that everyone can take part in.
ARIEL will observe around 1000 transiting exoplanets and for this survey to be as efficient as possible, we need to have a good knowledge of the expected transit time of the planets observed. This is where small and medium-scale telescopes can contribute significantly. To better organise this effort, we have created the project ExoClock that is open to everyone, professional and amateur astronomers as well as members of the public can get involved and contribute to the mission. In this presentation we will outline the current status on exoplanets, followed by the key points of the ARIEL mission and how the ExoClock project is contributing.
Meeting details below:
Topic: EP16 - Sunday, 23rd August 2020 7:30pm BST - ARIEL and ExoClock by Anastasia Kokori
Time: Aug 23, 2020 07:30 PM London
Join Zoom Meeting
https://zoom.us/j/93663661099?pwd=aU9qR0lRNEJhdzJYZW55V29OOHM4UT09
Meeting ID: 936 6366 1099
Passcode: 032530
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- 9 replies
EP15 - Sunday, 16th August 2020 7:30pm BST - Ikarus Observatory Public Data Pixinsight Workshop by David Wills - Pixel Skies
Grant posted a topic in StarGaZine,
Dave is an expert astrophotographer, you can see some of his work here and has had several of his images published in magazines such as Astronomy now and BBC’s Sky at Night and various AAPOD’s. He will be taking us through a full work-flow in Pixinsight using around 100 hours of Narrowband (Ha, OII and SII) data taken of M16 from the Ikarus Observatory setup. This will start from the raw data that is being released which will already have been stacked and calibrated ready for processing.
This won't be a full Pixinsight workshop as that's too much to cover in one session but, it will give you a tour of what Pixinsight can do and how you can put a workflow together. As the data will also be provided afterwards you will be able to follow along on YouTube yourself and have a go at following Dave's process or tweaking it to see what results you can achieve. We will also be announcing an image processing competition whereby we will be picking a winner of our favourite processed version 🙂
I will also be giving an update on progress with the Ikarus Observatory project and an overview of what it's all about and how SGL members can get involved.
Meeting details below:
Topic: EP15 - Sunday, 16th August 2020 7:30pm BST - Ikarus Observatory Public Data Pixinsight Workshop by David Wills - Pixel Skies
Time: Aug 16, 2020 07:30 PM London
Join Zoom Meeting
https://zoom.us/j/95946328998?pwd=a2E4bU1OWWEyL0JNTTRKYVVORDM3Zz09
Meeting ID: 959 4632 8998
Passcode: 908939
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- 13 replies
EP14 - Sunday, 9th August 2020 7:30pm BST - The Short Long History of Citizen Science in Astronomy by Chris Lintott
Grant posted a topic in StarGaZine,
Chris is a professor of astrophysics at the University of Oxford, where he is also a research fellow at New College, working on topics from galaxy evolution, transient detection and machine learning. As Principal Investigator of the Zooniverse, he leads a team who run the world’s most successful citizen science projects, allowing more than a million people to discover planets, transcribe ancient papyri or explore the Serengeti. A passionate advocate of the public understanding of science, he is best known as co-presenter of the BBC’s long running Sky at Night program. His book, ‘The Crowd and the Cosmos’, is now available from Oxford University Press.
‘Citizen Science’, through projects like Galaxy Zoo and Planet Hunters which ask volunteers to sort through data, is more popular and productive than ever before. But amateur astronomers have been making contributions to science for centuries. In this talk, which will include stories of a p**ed-off Welshman, a stoical Prussian and at least one story about penguins, Galaxy Zoo founder Chris Lintott (BBC Sky at Night) will talk about the historical foundations of citizen science, what can be done now - and what opportunities will exist in the future.
Meeting details below:
Topic: EP14 - Sunday, 9th August 2020 7:30pm BST - The Short Long History of Citizen Science in Astronomy by Chris Lintott
Time: Aug 5, 2020 07:30 PM London
Join Zoom Meeting
https://zoom.us/j/93821926723?pwd=V0hBTytNaWRncFliM0k4VCtYRE1mUT09
Meeting ID: 938 2192 6723
Passcode: 825115
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- 20 replies
EP12 - Sunday, 26th July 2020 7:30pm BST - Introduction to Astro Pixel Processor by Mabula Haverkamp
Grant posted a topic in StarGaZine,
APP is being developed primarily by Mabula who has a doctorandus and Master of Science degree in Astrophysics from the University of Utrecht, 2004.
Mabula uses current scientific insights to develop APP besides developing and creating new innovative features and algorithms like it’s unique debayer algorithm Adaptive Airy Disc, Local Normalisation Correction and fully automatic N-View mosaics.
Mabula is going to give us an overview of APP, how it works and what it can do plus a live demo and will also give us a sneak peak at upcoming features due to be introduced soon.
There will also be an opportunity for Q&A at the end.
Meeting details below:
Topic: EP12 - Sunday, 26th July 2020 7:30pm BST - Introduction to Astro Pixel Processor by Mabula Haverkamp
Time: Jul 26, 2020 07:30 PM London
Join Zoom Meeting
https://zoom.us/j/96005272477?pwd=dEExcFFGYTUvUkxwOE8zNU5CRGNUUT09
Meeting ID: 960 0527 2477
Passcode: 341269
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- 29 replies
EP11 - Sunday, 19th July 2020 7:30pm BST - An Introduction to Variable Star Observing by Gary Poyner
Grant posted a topic in StarGaZine,
Gary has been observing variable stars for over 40 years! During that time he has been Director of the BAA Variable Star Section, Editor of 'The Astronomer' magazine Variable Star pages, BAAVSS CV & Eruptive Stars Secretary, VSS Circulars editor and Web Master and Chairman of the Heart of England AS.
His main interests are Cataclysmic and Eruptive Variables, which he observes at every opportunity with his 51cm and 22cm reflectors from his observatory in North Birmingham. He also uses AAVSOnet remote telescopes in New Mexico and Arizona for CCD observations of Variables. Over the past few years he have mentored a number of observers in the UK and abroad in the art of variable star observing, and gives talks to Societies around the country. Mentoring and talking to clubs about different aspects of Variable Stars is clearly a passion.
Gary will give us a brief account of the science behind a selection of Variable Stars, explain how to observe them and discuss the reasons why we observe them. He will also touch on how and why they vary.
This should be an extremely informative talk from somebody who is an expert in the area of variable stars.
Meeting details below:
Topic: EP11 - Sunday, 19th July 2020 7:30pm BST - An Introduction to Variable Star Observing by Gary Poyner
Time: Jul 19, 2020 07:30 PM London
Join Zoom Meeting
https://zoom.us/j/98776512803?pwd=U1ExNXJlTkJDL0dmcXQwbnNseGF3dz09
Meeting ID: 987 7651 2803
Password: 543320
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- 11 replies
EP10 - Wednesday, 15th July 2020 7:30pm BST - Sequence Generator Pro by Darren Jehan
daz posted a topic in StarGaZine,
On 15th July, I'll do a session on Sequence Generator Pro - predominantly aimed at new users for this first session, but if you have any specific questions you'd like me to look at and cover, I'd be happy to...
I'll aim to do:
Overview of the interface / menu options
Profiles - User and Equipment
Connecting equipment
Set up a basic sequence
But happy to be steered by you all!
I'll then aim to do a 2nd session where we can look at things like plate solving, auto-focusing, framing and mosaic wizard, multiple targets etc. - or again, whatever you you would like!
Wednesday 15th July 2020 7:30 PM BST. As usual it will be recorded!
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- 7 replies
EP9 - Sunday, 12th July 2020 7:30pm BST - Meteorites: A Twenty-Year Gold Rush! by David Bryant
Grant posted a topic in StarGaZine,
David Bryant, BSc, Cert Ed has been described as a renaissance man: wildlife photographer, teacher, lecturer, ex-naval officer, rock guitarist, published artist, author and the UK's only full-time professional meteorite dealer, he has had what could be considered a full life! This is reflected in the breadth of content of these four books, which range from the UFO phenomenon, the Apollo lunar missions, ghosts, religious apparitions to evolution, planetary astronomy and the formation of the Universe! David has been widely published on many topics including natural history, meteoritics, climate change and ornithology.
The format of this talk will be a little different, it will be more of a conversation / interview style talk with David talking us through some of the history of meteorite collecting with lots of entertaining stories along the way! So pull up a chair, grab a glass of wine and join us on Sunday for what is sure to be a super talk!
Meeting details below:
Topic: EP9 - Sunday, 12th July 2020 7:30pm BST - Meteorites: A Twenty-Year Gold Rush! by David Bryant
Time: Jul 12, 2020 07:30 PM London
Join Zoom Meeting
https://zoom.us/j/98737087930?pwd=WVVzaHpObWtRcmpBRng1NTZmQkhIZz09
Meeting ID: 987 3708 7930
Password: 355999
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- 9 replies
EP8 - Sunday, 5th July 2020 7:30pm BST - Rebel Star – The Sun’s Greatest Mysteries by Colin Stuart
Grant posted a topic in StarGaZine,
In recognition of his efforts to popularise astronomy, the asteroid (15347) Colinstuart is named after him. In 2014 he was awarded runner-up in the European Astronomy Journalism Prize and is a Fellow of the Royal Astronomical Society. He's talked about the wonders of the universe on Sky News, BBC News and Radio 5Live and been quoted in national newspapers including The Daily Telegraph and The Observer.
Having seen a couple of Colin's talks now I can't wait for this one - he is a superb speaker and he's talking are extremely informative and entertaining - definitely not one to miss!
Rebel Star – The Sun’s Greatest Mysteries
GET TO KNOW OUR NEAREST STAR LIKE NEVER BEFORE
The Sun is many things: beauty, beacon, battery, belligerent. It’s the biggest thing for light-years around and yet we actually know relatively little about it.
That’s changing thanks to an armada of new spacecraft recently lofted into the solar system to scrutinise the Sun in unprecedented detail. In a 45 minute talk packed full of jaw-dropping images and videos, I’ll be your guide on a journey deep into the heart of our nearest star.
Meeting details below:
Topic: EP8 - Sunday, 5th July 2020 7:30pm BST - Rebel Star – The Sun’s Greatest Mysteries by Colin Stuart
Time: Jul 5, 2020 07:30 PM London
Join Zoom Meeting
https://zoom.us/j/99985123857?pwd=MU0xeklkdjJsdWEwTkNNUURkbFl6dz09
Meeting ID: 999 8512 3857
Password: 106194
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- 16 replies
EP7 - Sunday, 28th June 2020 7:30pm BST - A Closer Look at the Sun by Gary Palmer
Grant posted a topic in StarGaZine,
Gary is going to give us a talk showcasing the various methods for capturing the Sun as well as talking through his workflow and showing us lots of processing tips and tricks touching on SharpCap, Registax, Photoshop and AutoStakkert!. He will also be discussing some of the recent innovations in equipment for solar imaging.
We look forward to seeing you Sunday, at 7:30PM. Zoom meeting details will be posted here Sunday.
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- 13 replies
EP6 - Sunday, 21st June 2020 7:30pm BST - Hershel to Hawkwind by Peter Williamson
Grant posted a topic in StarGaZine,
Peter was meant to join us at last years star party to deliver this talk but following the floods in Herefordshire the star party was cancelled so we are very pleased to be able to invite Peter to deliver this talk to us virtually! 🙂
Peter is going to deliver the talk Herschel to Hawkwind, Astronomy & Music how each influence each other.
We look forward to seeing you Sunday, at 7:30PM. Zoom meeting details will be posted here Sunday.
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- 18 replies
EP5 - Wednesday, 17th June 2020 7:30pm BST - Members Talks - Mark at Beaufort & Lunator - Visual Astronomy
Grant posted a topic in StarGaZine,
We are also trialling a mid-week slot for these members talks. If anybody else fancies delivering a talk or partial talk, please let us know 🙂
Talk 1 - Observing Visual Double Stars - Jewels of the Night Sky by Ian / Lunator
Kicking off is Ian / Lunator who's specialist subject is double stars 🙂
Ian will be sharing six interesting double star targets, how to find them with star hopping and what to expect.
Talk 2 - Visual Observing Arrangements, Procedures and Tips plus some Challenges by Mark at Beaufort
Mark is a passionate visual observer and will guide us through how he plans and arranges his observing sessions with lots of tips and some observing challenges for us all to have a go at.
Each talk is going to be around 15-20 minutes with a 10-15 minute Q&A break.
As usual, I will post the Zoom meeting details in here sometime during the day Wedesday.
See you all then!
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- 15 replies
EP4 - Sunday, 14th June 2020 7:30pm BST - Ten Ways the Universe Tried to Kill You by Steve Tonkin
Grant posted a topic in StarGaZine,
Steve isn't going to be talking about binoculars (this time) but instead, we thought something less practice and more entertaining would make a nice treat so he will be giving his talk 'Ten Ways the Universe Tried to Kill You':
From gamma-ray bursts to asteroid impacts, an overview of cataclysmic events. This light-hearted but scientifically robust approach incorporates a lot of fundamental cosmological processes, from stellar evolution to galactic interaction. It is appropriate for both beginning and intermediate amateur astronomers.
We look forward to seeing you Sunday, at 7:30PM. Zoom meeting details will be posted here Sunday.
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- 17 replies
EP3 - Sunday, 7th June 2020 7:30pm BST - Summer Observing Challenges by Dave Eagle
Grant posted a topic in StarGaZine,
Dave is going to treat us to an overview of interesting Summer observing targets and challenges
We look forward to seeing you Sunday, at 7:30PM. Zoom meeting details will be posted here Sunday.
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- 22 replies
EP2 - Sunday, 31st May 2020 7:30pm BST - Adventures in Astro Image Processing by Nik Szymanek
Grant posted a topic in StarGaZine,
We will be joined by Nik Szymanek who will be giving us a talk on 'Adventures in Astro Image Processing'.
Nik was present for Steve's talk and is going to build upon some of the points and questions raised so will be covering:
Milky Way Image Processing
Deep Sky Stacker
Dithering / Calibrating your images
Using Fits Liberator
Putting together RGB and LRGB images
And more 🙂
We look forward to seeing you all Sunday - I will post meeting details Sunday lunchtime again.
Cheers,
Grant
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- 66 replies
Imaging Challenge #27 - DSLR / Mirrorless Winners
Grant posted a topic in Imaging Challenge - Announcements / Winners,
NLC arch frame By Daniel-K
Milky way, Jupiter and Rho Ophiuchi By alexbb
HDR Lunar eclipse and clouds By Ethan Roberts
Teesdale aflame... By clarkpm4242
https://stargazerslounge.com/topic/339127-teesdale-aflame/
Congratulations @Daniel-K, @alexbb, @Ethan Roberts and @clarkpm4242 please PM me your addresses so we can send you your prize mug
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- 19 replies
Imaging Challenge #26 - 30 Seconds Unguided 2 - Winners
Grant posted a topic in Imaging Challenge - Announcements / Winners,
The winners are:
Full Arch Over Joshua Tree By HunterHarling
m16 By geordie85
M13 The Great Hercules Globular Cluster By Graeme1858
Well done @HunterHarling, @geordie85 and @Graeme1858 - please PM me your addresses so we can send your prize mugs out
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- 20 replies
Imaging Challenge #30 - Celestial Motion
Grant posted a topic in Imaging Challenge #30 - Celestial Motion,
Start Date: 1st September 2019
End Date: 30th November 2019
Rules: The theme this time is Celestial Motion - we want to see star trails, time lapses, animations, comets, transits, planetary movement - anything that shows off the movement we see in the night skies. Images, animations, videos, sketches all welcome 😀
Prize: A personalised mug for 1st, 2nd and 3rd places featuring your image kindly provided by our sponsors FLO and a virtual trophy for your signature.
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RULES
All data must be captured and processed by you (no collaborative entries).
Data must be captured during the challenge start & end dates.
Multiple entries are allowed but please start a new topic for each entry.
Multiple submissions of the same image, processed differently, will not be accepted.
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To enter please start a new topic with your image in the ‘Imaging Challenge #30' forum (each challenge will have its own). Please post as much information as possible - when it was taken, how it was captured and processed, etc. The info won't necessarily be used for judging but will help fellow SGLers looking to learn and improve their knowledge and technique.
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- 14 replies
Imaging Challenge #25 - Solar - Winners
Grant posted a topic in Imaging Challenge - Announcements / Winners,
Well done to everyone who entered and congratulations to the winners below 🙂
AR2738 and environs By michael.h.f.wilkinson
AR2741 WL By Freddie
Solar disc after the thunderstorm By acr_astro
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- 10 replies
Imaging Challenge #29 - The Beauty of the Night Sky
Grant posted a topic in Imaging Challenge #29 - Beauty of the Night Sky (Now Closed),
Start Date: 1st August 2019
End Date: 31st October 2019
Rules: Open to all - any image that shows the beauty of the night sky - widefield, landscape, sketch, poster, deep sky image, video, planetary - whatever you like, inspire us!
Prize: A personalised mug for 1st, 2nd and 3rd places featuring your image kindly provided by our sponsors FLO and a virtual trophy for your signature.
--
RULES
All data must be captured and processed by you (no collaborative entries).
Data must be captured during the challenge start & end dates.
Multiple entries are allowed but please start a new topic for each entry.
Multiple submissions of the same image, processed differently, will not be accepted.
--
To enter please start a new topic with your image in the ‘Imaging Challenge #29' forum (each challenge will have its own). Please post as much information as possible - when it was taken, how it was captured and processed, etc. The info won't necessarily be used for judging but will help fellow SGLers looking to learn and improve their knowledge and technique.
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- 14 replies
Imaging Challenge #24 - Android vs iOS - Winners
Grant posted a topic in Imaging Challenge - Announcements / Winners,
Congratulations to the winners:
Moon and Venus By Angvd
Moon with Samsung S7 Android By Pete Presland
Piccolomini - Galaxy S8 By CraigT82
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- 11 replies
Imaging Challenge #28 - Lunar Landings
Grant posted a topic in Imaging Challenge #28 - Lunar Landings (Now Closed),
Start Date: 1st July 2019
End Date: 30th September 2019
Rules: To celebrate the 50th Anniversary of the Apollo 11 Moon Landing the challenge this month is to take an image or produce a sketch / drawing showing any of the Lunar Landing sites from not just Apollo missions but any place where a human made object has landed on the moon. Close-ups, wider field, animations, movies with annotation or graphics you create are all welcome 😃
Prize: A personalised mug for 1st, 2nd and 3rd places featuring your image kindly provided by our sponsors FLO 😃 and a virtual trophy for your signature.
--
RULES
All data must be captured and processed by you (no collaborative entries).
Data must be captured during the challenge start & end dates.
Multiple entries are allowed but please start a new topic for each entry.
Multiple submissions of the same image, processed differently, will not be accepted.
--
To enter please start a new topic with your image in the ‘Imaging Challenge #28' forum (each challenge will have its own). Please post as much information as possible - when it was taken, how it was captured and processed, etc. The info won't necessarily be used for judging but will help fellow SGLers looking to learn and improve their knowledge and technique.
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- 9 replies
Jupiter - better than expected
Stu posted a topic in Observing - Planetary,
My pier mounted GP-DX is not ideally positioned to see Jupiter down so low, so I popped the Sphinx down at the bottom of the garden where there is a better view back over the houses. I decided to risk the Mewlon, hoping that the seeing would be better than last night. GRS was showing as visible so I was hoping to pick it up long before it got dark. I think I first spotted it in binoculars at around 9.30pm, and got the scope centred on it. Initial views were not promising, although I could just about see GRS and Io about to drop behind the planet.
I persevered on and off for 2.5 hours, just packing in a few minutes ago and have been rewarded by the best views I've had this opposition. That is not saying an awful lot, but they were better than I expected, improving nicely as the night cooled and the planet got higher.
I stuck with x164 through the binoviewers, and as things improved, GRS became more distinct as it headed toward the limb. There was a pleasant amount of belt detail, some festoons off the NEB and distinct colour to the bands. Atmospheric CA was there when the seeing worsened but generally it was unobtrusive.
Didn't look at much else, just the Double Double and some alignment stars, but 'twas great to get out there and to be rewarded with some decent views.
Hope you are enjoying it if you are out.
PS Saturn was RUBBISH 🤣🤣, no doubt it will improve a little as it gains height, but I need my bed!!
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- 39 replies
Imaging Challenge #27 - DSLR / Mirrorless
Grant posted a topic in Imaging Challenge #27 - DSLR / Mirrorless (Now Closed),
Start Date: 1st June 2019
End Date: 31st August 2019
Rules: Very simple - any astronomical images taken with a DSLR or Mirrorless camera goes, be as creative as you like! Can be through a lens, telescope, pin hole! Videos, animations, single shots, stacks, guided, unguided all as you like but it must be captured using a DSLR or mirrorless (or point and shoot...) camera. Creative / unusual images always capture the judges eye! Have fun 📷
Prize: A personalised mug for 1st, 2nd and 3rd places featuring your image kindly provided by our sponsors FLO and a virtual trophy for your signature.
--
RULES
All data must be captured and processed by you (no collaborative entries).
Data must be captured during the challenge start & end dates.
Multiple entries are allowed but please start a new topic for each entry.
Multiple submissions of the same image, processed differently, will not be accepted.
--
To enter please start a new topic with your image in the ‘Imaging Challenge #27' forum (each challenge will have its own). Please post as much information as possible - when it was taken, how it was captured and processed, etc. The info won't necessarily be used for judging but will help fellow SGLers looking to learn and improve their knowledge and technique.
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- 3 replies