Membership details:


● £20 per year*


● Non-members £3.50 first 3 meetings  then annual membership subscription due pro rata for remaining meetings.


● Free to under-18s and full-time students. Proof of status may be required


● Under 16s must be accompanied by an adult.

Meeting held at:

Tewingbury Farm

Hertford Road

Welwyn Garden City



Tel:01438 717793

Wednesday 9 January 8:00pm


Surveying the sky for radio galaxies


Martin Hardcastle


Please note this meeting is being held in the Millstream Room at Tewinbury Farm, Hertford Road, WGC, AL6 0JB

What happens at our meetings?


Doors open at 7:00 for the meeting due to start at 8:00 but several club members and friends gather before this to have a drink and chat in the bar.


Following welcome announcements we have a guest speaker who speaks on the subject of the evening for about 45 - 60 minutes.  This is followed by questions relating to the talk.


Announcements about forthcoming events follow.


You can then choose from the following activities:


1. If the weather is clear telescopes and binoculars brought by members are set up outside for some observation.  Members doing so will be pleased to share their scopes with others.


2.  Learn about what will be coming into view in the next few weeks with an extra talk at 9:30.


3. If you need help with some equipment then now is your chance to bring it in.  Others in our club will be more than willing to help you.  Don’t be shy, we get just as excited about a telescope bought at the charity shop for £20 as we do one costing many times more.


4. Just socialise with others - about anything!


We look forward to seeing you.  No need to book - just turn up.


Martin Hardcastle is an astrophysicist specializing in radio astronomy, high-energy astrophysics and the physics of active galactic nuclei, and is the Director of the Centre for Astrophysics Research at UH. He has published more than 220 papers in refereed journals. A former Royal Society Research Fellow, he worked for Cambridge, Bristol and the Open University before moving to UH.


Radio galaxies and their relatives, radio-loud quasars and blazars, are types of active galaxy nuclei that are very luminous at radio wavelengths, with luminosities up to 1039 W between 10 MHz and 100 GHz.  The radio emission is due to the synchrotron process. The observed structure in radio emission is determined by the interaction between twin jets and the external medium, modified by the effects of relativistic beaming. The host galaxiesare almost exclusively large elliptical galaxies. Radio-loud active galaxies can be detected at large distances, making them valuable tools for observational cosmology. Recently, much work has been done on the effects of these objects on the intergalactic medium, particularly in galaxy groups and clusters.


Something Extra!


What is in the sky for the next few weeks


Following the message on a previous newsletter for items for the committee to consider Barbara Goult came up with a great idea:


"I think it would be interesting to all members, and useful to those of us new to astronomy, to have a small item at the beginning of the meeting that looks at the night sky for the month ahead, highlighting anything of particular interest  to lookout for."


We discussed how to go about it and felt that trying to start it before the meeting might be a bit difficult as people would be arriving and possibly not creating for the best of presentations.  Also we know how memory works (a bit) and that what we might impart before the main talk may easily be forgotten by the end of the talk.  However, we thought that it would be perfectly possible to have the event after the main speaker had finished  - after a 10 minute or so gap to stretch legs, go to the loo etc.


Martin led the first session at the November meeting and it was cleraly a popular addition to our evening so we will be repeating it in the future.


Thanks to Barbara for suggesting it and to Maring for doing it.


If there are any other suggestions from other folk do let us know.

Proposed Programme for 2018-19

(Subject to Change)

September 12th

Roger O'Brien

'oumuamua and other things out there

October 10th

*Mark Thompson

(note change of speaker)

The Bayfordbury Observatory

November 14th

Martin Braddock

Artificial Gravity

December 12th

Alice Sheppard

Galaxy Zoo

January 9th

Martin Hardcastle

Surveying the sky for radio galaxies

*Note: this event is being held in:

Millstream Room, Tewin Bury Farm

February 13th

Paul Money

Images of the Universe - Part 3

March 13th

Alistair Scott

Britain in Space

April 10th

John Timmins

Telescope Choices

May 8th

Bob Marriott

Silver-on-Glass Revolution and AGM

June 12th

Jerry Stone

Apollo 11 - 50 years on the Moon