Monday, 12 October 2026

The Astronomy Show on Drystone Radio

 Join me, Martin Lunn MBE every Monday evening from 7.00 pm-9.00 pm on the award-winning Astronomy Show on Drystone Radio, probably the only regular astronomy show on any radio station in the country. 

I will take my weekly look at the night sky and look at all the latest news in astronomy. There will be the astronomical anniversaries this week plus the latest news from the astronomical societies in the north of England.


The Astronomy Show every Monday evening only on Drystone Radio live online at www.drystoneradio.com DAB radio in Bradford and East Lancashire, or 102 and 103.5 FM and can also be heard later on the Drystone Radio Podcast.

Sunday, 11 October 2026

A little ramble through Pisces the Fishes

 Pisces the Fishes

An ancient constellation representing a pair of fishes tied by their tails, the knot being marked by the star alpha. One legend identifies the constellations with Venus and her son Cupid, who turned themselves into fishes and swam away from the attack of the monster Typhon.

Pisces was known as a fish to the Babylonians who called it Nunu, the Persians called it Mahik while to the Turkish astronomers it was Balik. The Chinese called it Tseu Tsze and the Arab astronomers knew it as Al Samakah.

The constellation’s most celebrated feature is that it contains the vernal equinox – the point at which the Sun moves across the celestial equator into the northern hemisphere each year. The point originally lay in Aries, but has now moved into Pisces because of precession, eventually it will move onto in Aquarius. It is still called the First Point of Aries.

Pisces can be seen in the autumn, and it is a zodiacal constellation. None of the stars that form Pisces are very bright


Alpha or Alrisha which means Cord has a magnitude of 3.8 is actually made of two stars of magnitude 4.3 and 5.2, a small telescope will show both stars. Alpha is 311 light years away and is an A class star.

Eta the brightest star in Pisces was known to the Babylonians as Kullat Nunu or The Cord of the Fish. Eta has with a magnitude of 3.6, it lies 350 light years away and is a G class giant star with a temperature of 4,700’ C

Gamma magnitude 3.7 is a G class stars with a temperature of 4,600’C and is 138 light years away

FL19 or TX Pisces is a deep red irregular variable.  One of the reddest stars that can be seen by the naked eye. TX varies between magnitude 4.9 – 5.5 in a period of between 224-450 days. Its 900 light years distant.

M74 a spiral galaxy called the Phantom Galaxy is 32 million light years away It has a magnitude of only 10 discovered meaning you would need a telescope to see it. M74 was discovered by  Messier in 1780, it is one of the most elusive of the Messier objects.


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Saturday, 10 October 2026

A little ramble through the Astronomical Register May 1863 - colonial astronomy

 We learn from the Melbourne Argus of the 23d of February that the new observatory, for which a grant of £ 4500 was recently voted by the Colonial Legislature, is nearly completed, and the colonists are proud of it, as they may well be.

The transit instrument will be second only to those at Greenwich and Capetown; and Airy's zenith sector is at present in constant use in connexion with the survey of the colony, and the determination of the boundary between Victoria and South Australia.

 It has been determined to provide this observatory with a telescope of much greater optical power than any previously used in the southern hemisphere, to be employed chiefly in observations of nebulæ; and the advice of the Royal Society was desired as to the best instrument to be used.

 We believe that it has been decided that a reflector as large as, and similar to Lord Rosse’s, to be constructed in this country, should be employed. Should this course, which really seems rather a hazardous one, be adopted, we trust that the effects of the long voyage, and extremes of temperature, and loss of figure and polish, may all be avoided, and that the colony may reap all the laurels it deserves.


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Friday, 9 October 2026

Cooke Telescope Tales - BA meeting in York in 1881

 Messrs Thomas Cooke and Sons of York had a display of scientific instruments for the meeting of the British Association for the Advancement of Science. It was the 50th anniversary meeting in York. The first was held in York in 1831. 

Cookes had on display an achromatic telescope OG of 15.5 inches in a brass cell. In addition, there was a transit instrument and a large fixed equatorial telescope for the Spanish Transit of Venus expedition in 1882. 

There was also an electrically controlled chronograph for recording astronomical observations. In addition, a solar spectroscope with 5 prisms and double ray reversion equal to 20 prisms.


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Thursday, 8 October 2026

A little ramble through Pictor the Painters Easel

A faint constellation overshadowed by the brilliant star Canopus in Carina to one side and the Large Magellanic Cloud in Dorado on the other. Pictor cannot be seen from Britain.

The constellation was invented by Lacaille in the 1750s while in the southern hemisphere. There are no myths or legends attached to the constellation.

The brightest star alpha with a magnitude of 3.3, if there is any mist or moonlight the star cannot be seen. It’s an A class star 7,000 degrees and is 97 light years away.

The only other star worth mentioning is beta a magnitude of 3.9 another A class star this time hotter with a temperature of 8,000 degrees and is 65 light years away. Beta is a young star only 20-26 million years old. There are three planets orbiting the star.

A bright nova was seen by R. Watson in South Africa on May 25th, 1925 when it had a magnitude of 2.3 and reached a maximum brightness of magnitude 1.2 on June 9th, 1925, by July 4th it had faded to magnitude 3 then unexpectedly rose again to magnitude  1.9 on August 9th. The nova which today is known as RR Pictor is classed as a slow nova unlike nova Aquila 1918 and Nov Puppis 1942 which are fast nova. RR is believed to be around 1,700 light years away.

A nova is a binary system with a small white dwarf star and a large cool giant star they orbit each other. The white dwarf pulls gas from the giant star towards it and some of this gas then cascades down onto the surface of the white dwarf which throws this gas into space.

 In the Middle Ages before the invention of the telescope when people saw this kind of star appearing in the sky where nothing had been seen before they called it a Nova which in Latin means new. They thought a star was being born.  Today we know that these are older stars going through a cycle in their timeline.


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Wednesday, 7 October 2026

Cooke telescope Tales - 50 years of service

In August 1947 a social evening was held to commemorate the retirement of 5 veteran craftsmen at Cookes. Messrs A Harrison, T Dwyer, C Grewer, W Wrigley and J Danby all had worked for over 50 years at Cookes, they all stared at the end of the 19th century. 

The social evening was held at the clubhouse where Mr E W Taylor joint managing director and son of HD Taylor who designed the Cooke Portrait Lens attended to present the proceeds of collections to each of the retired men. 

Some of Mr Taylor’s anecdotes were enlightening to a younger generation, whilst others created amusement which continued with responses from the honoured guests. 

It was a very pleasant evening.


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Tuesday, 6 October 2026

A little ramble through the Astronomical register June 1863 - Ormsby MacKnight Mitchel

The Astronomische Nachrichten of Jan. 26 notifies the death of Ormsby MacKnight Mitchel at the age of 52. Professor (or Major General) Mitchel was the founder, and for some time Director, of the Cincinnati Observatory, and was more recently Director of the Dudley Observatory, Albany, F.S.A. At the time of his death Professor Mitchel was serving as a Major General in the army of the Northern American (Federal) States.


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