Chairman’s reports and sky notes
See Sky Notes. In particular:
- There will be no actual astronomical darkness until August as the sun skims under our South Lakes horizon.
- Venus, just after about 10:30 PM, is at the bright magnitude -4 above the western horizon near the crescent
moon on the 16th June.
- Jupiter is visible from sunset to sunrise, starting low in the south-east.
- Saturn will rise with the full moon late in the month.
Links to the items raised:
Variable star photometry
One of our members presented results taken over two nights of measuring the light detected from two stars, using a QHY163c CMOS astro camera connected to a 10″ telescope, compared to the light received from nearby comparison stars of known magnitude – the technique known as differential photometry. The first star was a well known contact binary star system V523Cas (with a magnitude change of ~0.9 magnitudes) which acted as a useful and successful testbed for the photometry system.
The low noise permitted the second study – the attempt to detect the transit of planet across the face of a distant star from a Kendal backyard. An online search (http://var2.astro.cz/ETD/predictions.php)
on the next clear night, 10 December 2017, suggested the excitingly labeled XO-6b with a relatively large magnitude change of 0.013 magnitudes. This 10 magnitude star, 270 light years away, was measured over an evening of deteriorating conditions. The sky conditions deteriorated so badly that all stars dimmed by 50%!
The change in brightness signal of the target star, blue, and three potential comparison stars during the night of the observations.
Nevertheless, comparisons with
light levels from neighbouring stars indicated a 1.2% diminution of the
light from the target star. The diminution is caused by an exoplanet, twice the size of Jupiter at 8% of Earth’s orbit radius,
that transits the star approximately every four days. The timing and dip in brightness occurred at both the right time and expected size.
Smoothed magnitude change for the exoplanet transit across the face of the star XO-6b.
Telescope Night (outside)
The second half of the evening was spent outside in the Museum grounds under a blue sky. Members and guests milled around asking questions and demonstrating their own telescopes, mounts and software.
Guest speaker: Professor Ian Robson “Confessions of an Astronomer”
Professor Ian Robson gave a light-hearted talk covering his career in astronomy from a telescope on the top of Queen Mary University above a London street in the 1960’s to the top of a snow-drifted Mauna Kea, Hawaii – including frequent, confessional asides. Some aspects may have been expected, such as bids for project finance and student and graduate applications on a professor’s desk. Less expected were the thousands of air miles accumulated over a lifetime in astronomy.
Prof Robson has written a book demonstrating the connections between observations and theory: Active Galactic Nuclei
Sky and Society Notes for May
See Sky Notes. In particular:
- Venus at the bright magnitude -3.9 in the evening presents a three-parts, waxing gibbous phase visible in small telescopes.
- Jupiter is visible from sunset, starting low in the south east.
- Full astronomical darkness will not occur again until August.
Major night sky imaging proposal
The society has been offered the opportunity to participate in a world wide public outreach project using the Las Cumbres Global Telescope Network. Our choice of target is likely to be the Hyades cluster in Taurus. Of significance to EAS, the displaced positions of Hyades stars were those measured by Sir Arthur Eddington during the 1919 Solar Eclipse confirming Einstein’s General Theory of Relativity.
Volunteers to present are just about enough to hold the proposed Solar System in Kendal event on Saturday 18th August.
The Constellation of the Month
Our regular member’s presentation of Constellation of the Month featured the low, summer constellation of Virgo. Leo was also included.
NASA successfully launched their Insight Mission a week ago to arrive on Mars in two months time. Over the following Mars-year (approximately 1.5 Earth years) the mission lander will probe the surface with a seismometer and then wait to measure the vibrations from any subsequent seismic events.
The upper atmosphere of an exoplanet (WASP-107b) has been analysed using the light filtered through it during a transit, revealing the (not unexpected) presence of Helium. Work to test the method on Earth’s atmosphere (Yan et al. 2014) proved that atmospheric compositions can be studied in this way and that significant biomarkers (oxygen, water, NO2) can be detected. They analysed the light that passed through Earth’s atmosphere and bounced off the moon during a lunar eclipse.
The universe expands with distance at a rate which is given by the Hubble Constant – or are there two Hubble Constants? 68 km/sec or 73 km/sec – or, even, both. Measurements have been made using the structure of the early Universe and using ‘standard candles’ in galaxies as in our February guest speaker’s research. The values obtained by the two methods appear to be different, and the chance that the difference is a fluke is currently less than 0.01%. This is nearly at ‘discovery’ level but not quite. If the difference is true, it may point the way to new physics or an overhaul of cosmological models. In the words of our member: ‘Over to the Cosmologists to sort this one out’.
Sky and Society Notes for April
See Sky Notes in particular.
Major night sky imaging proposal
The society has been offered a one-hour imaging session of an astronomical object of their choice on the Las Cumbres Global Telescope Network . The offer has come from Carl Pennypacker, one of
the teams whose studies of
supernovae led them to infer in 1998 the existence of dark energy driving the expansion of the universe.
The society is keen to involve any members who wish to engage with this imaging project, including local
schools if appropriate. We have until December to choose an object and conduct the imaging. Please get in touch here if you would like to be part of this
project, or if you have any suggestions for imaging targets.
The meeting was reminded that the upcoming event at UCLAN in Preston: The Jeremiah Horrocks
Spring Lecture Comets, Asteroids and Impacts. Should we worry and what can we do? Tuesday 15th May
2018 – 6:30 pm.
More volunteers are required for a few hours during the proposed Solar System in Kendal event on
Saturday 18th August.
The next Member’s Observing evening will be in autumn when dark nights return.
The next public Moonwatch will be on Saturday 24th November
One member demonstrated an impressive difference in colour hues using
Pixinsight on the Horsehead Nebula Not cheap software package but highly
recommended for colour correction using a star catalogue. Now listed on our Links page under Software used by members
The farthest star ever detected has been imaged by the Hubble telescope, a Blue Giant in a galaxy nine billion
light years distant: Hubble Uncovers the
Farthest Star Ever Seen. Forget the Kepler space
mission , a recent
paper encourages more enthusiastic, if not radical, members to use their standard DLSR cameras to join in
the search for exoplanets.
Guest speaker Robert Ince
“Widefield and time-lapse astrophotography”
After answering to a professional career migrating from explosives to his lifetime interest in
Astronomy, Robert Ince illustrated his personal revival of astrophotography with a camera only – without his 12″
telescope. Beginning with landscapes with star backgrounds and star trails, the talk progressed through driven
exposures, including time-lapse video and panning sequences, to the use of filters. Robert described in detail
his post-exposure processing using a wide range of software. A number of useful links were listed:
The links above are now on our
Software used by members
19th March saw us heading for Helsington Church to catch this conjunction of three heavenly bodies, under the impression that the forecast was going to deliver a clear sky. Well, I think this photo from Ted Woodburn sums it up – all three were visible at some point during the evening, but not necessarily at the same time!
Still, a good time was had by all who came out to see…
See Sky Notes in particular: Sunday 11th when the Moon and Saturn rise together, Monday 19th when the Moon, Venus and Mercury set together – suitably viewed from the Scout Scar mushroom and Helsington church grounds, Saturday 24th for the EAS public Moonwatch at the Brewery when the crater Plato will be casting shadows from the terminator division between lunar night and day and see late night 27th for Astronomical gamblers.
See SpaceX landing video for the SpaceX landing.
Astrobites has been added to our links page joining Sky & Telescope and Astronomy Now
Guest speaker Dr Anne Sansom on Dust in Early-Type Galaxies
Dr Sansom discussed the presence of dust in early-type galaxies (lenticulars and ellipticals), and what that can tell us about how these galaxies formed and evolved. Dust is an indicator of what has happened in a galaxy over its life and can be added by galaxy mergers or stars as they age, and is destroyed over time, so how much dust is present can reveal much about what has happened to a galaxy over its life.
Much of the work comes from the Herschel-ATLAS survey, the Galaxy and Mass Assembly (GAMA) project for three specific areas of the sky, and the Herschel Virgo Cluster Survey (HeVICS). The results so far show that the early-types in the GAMA regions can broadly be split into dusty, with some star formation still underway, and non-dusty. The dusty ones are “green valley” galaxies, as opposed to the “red and dead” ones on the red sequence. In contrast, galaxies in the Virgo cluster have less dust in them, but the galaxies here are closely packed together so galaxy environment could be important in how dust is generated or destroyed in a galaxy. There is still a lot of work to do with this topic, but it is an active topic and more results are on their way.
The forecast of clear skies for Tuesday 20th February had been consistent for about three days, but within an hour of announcing the observing evening at around 4pm it had completely clouded over. Such are the frustrations of organising events in Kendal.
So it was an act of complete denial to go and set up at Boundary Bank, and I was delighted to see that I was not alone. At about ten past seven, the security lights switched off, the clouds lifted and we had horizon-to-horizon clear dark skies. The cold dry air brought a clarity and transparency rarely seen in Cumbria.
A relatively small turnout of about a dozen members, but with three good telescopes to share there was plenty of eyepiece time for everyone. Special thanks go to David Glass for giving so much attention to the new members and making them feel very welcome. One commented how delighted she was that people were willing to share the views through such amazing kit – I had never really thought of it in that way.
What did we see and do? A round up of the constellations – with mythology from Moira – emphasising the difference between the rotating northern horizon and the ever-changing southern horizon, some double stars from David, star clusters including The Pleiades and the Perseus Double cluster, a long look at The Orion Nebula (below, my photo from 14 February) at various magnifications, a fruitless search for Uranus very close to the Moon.
We finished with the Moon itself, an outrageously clear waxing crescent with fabulous detail around the terminator. All in all, a very relaxed session with everyone just happy to be out.
About a dozen EAS members met at our regular Observing Evening spot on Sunday night, where the very kind staff at Boundary Bank had left the car park gate unlatched so that we could gain access. There was a bit of a scare when the security lights failed to switch off at 7pm, but all was well when they went out at about ten past.
We managed a review of the constellations, with mythological references from Moira, and picked out some less-easy asterisms such as parts of Pisces. Triangulum is now locked into my memory too.
Many thanks to David Glass for picking off some of the more difficult targets, M27 (The Dumbbell Nebula) and Uranus in particular. I found M57 (The Ring Nebula) and we marvelled at the clarity of M31 (The Andromeda Galaxy) in Ian Bradley’s generously lent 10″ reflector zinging around on my AZ-EQ6 mount. We caught M32 nestled next to M31, and also M110 as an independent and clearly visible smudge in the same field of view.
Jane and Steve got their new Celestron working, yippee!
Ian Bradley left his camera running for the session, pointed at the North America Nebula in Cygnus.
David and I set a hare running with some ideas for short talks based on the objects we viewed. Watch this space!
Two favourite moments for me were seeing M110 distinctly in the eyepiece, and identifying the star on the southern horizon pointed out by Wendy, as Formalhaut. Now there’s a short lecture on astronomy history begging to be put together – here are the first and last slides of the talk, who’d like to fill in the gaps?
Statue in Rome
Fomalhaut by Hubble
See you next time
Created from Cassini images over 20 years, apparently:
Click here for menu of solar system objects
There is a free public lecture in Preston on 28th September 2017; the Jeremiah Horrocks Autumn Lecture. The speaker is Professor Lucie Green, and the title is “15 million degrees: journey to the centre of the Sun“.
It will be in the Darwin Lecture Theatre, 6.30pm start. Although it is free, you will need to apply for a ticket in advance: