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.

 

Cooke Telescope Tales - solar eclipse in Ceylon 1871

 Englishman's Overland Mail Wednesday 27^th December 1871 

 

The Eclipse as Observed in Ceylon 

The solar eclipse on December 12^th 1871 was most favourably observed at all the stations occupied by the scientific party under Mr Lockyer’s direction as well as by Mr Janssen. Important scientific results may be expected  to be shortly made known as indicated in the the message from Mr Lockyer. 

Here in Colombo the weather during the eventful morning was all that could be desired, but being beyond the line of totality and shadow no special scientific value can be attached to the highly interesting observations made here by several gentlemen. 

Our column this time will be unusually full of information respecting the eclipse and the special expeditions sent from home to observe it. About 3.5 inches of rain fell in Colombo between 8 00 pm on the 11^th and 5.00 am on the 12^th. We add the results of local observations:- the Sun rose obscured by clouds, which cleared off by about 6.30 .The whole surface of the Sun presented the usual strippled broken appearance, with here and there large spots. In the neighbourhood of these spots the strippling was more apparent than over the parts free of spots, but they came out in bold relief on the part of the Sun  close to the Moon’s limb. Probably this increase of distinctness was caused by contrast of the black spot &c of the dark limb of the moon. This could not be seen through the 3-inch telescope. Some little time before the greatest obscuration a halo was visible around the sun, which gave place to short bright rays. This latter appearance was probably an ocular deception, as no trace of it was visible through the 4.5-inch telescope under a low power. 

At the greatest obscuration no trace of corona was observable through the same instrument, with a solar eyepiece with a power of about 30. This was carefully looked for. The unobscured portion of the sun, about 15-16ths of its disc, was well defined, without appendages of any kind. Towards the time of centrality the diminution of daylight was very conspicuous—going from the open air into the house it was very striking. Standing in the centre of the room, and looking through the open window, the sun-shine outside was of a neutral tint. The crows commenced to assemble on the tree-tops, cawing after their usual fashion, when preparing for their night's rest. The planet Venus, high in the sky, was distinctly visible to the naked eye, and Jupiter, low down in the western horizon, was plainly discernible with the aid of an opera-glass. The thermometer at the commencement of the eclipse indicated 91.5 °F  in the sun.  At 7-15 it showed a rise of 2.5 degrees and at the greatest phase it had  fallen to 84.5°.  In the shade it stood at 76 degrees; at 6-45 and at the greatest obscuration at 75°  At 9-10, with the full blaze of the then unobscured sun, the thermometer indicated 113 °; in the shade 81°. 

 Mr. Van Dort, of the Surveyor- General's Department, with the aid of a 3-inch telescope, power 50, made some careful drawings of the different phases of the eclipse. The attempt to take the time of first contact and the ending of the eclipse proved abortive. An ordinary watch was the only time- keeper at hand. 

Instruments used in the above observations : Equatorial Telescope by Cooke and Sons, of York, 4.5  inches clear aperture, 66 inches focal length. Telescope by same makers, 3 inches clear aperture, 42 inches focal length, mounted on tripod stand." 

The above indicates the result of observations taken by Mr. Stainfurth Green at his residence in Colpetty. Mr. Stoddart, of the Surveyor- General's Office, took observations at the local observatory, showing the actual time to be 

First contact 06 h 47m 30 s am 

Greatest darkness 07h.50 m15s

Last contact 09h.00 m 20s 

Mr. W. L.H Skeen took some very successful photographic views, which show not only the progress of the eclipse, but the direction and form of the huge rays, projected from the sun or its corona, so much talked of.—Ceylon Observer.

                                                   www.theramblingastronomer.co.uk

A little ramble through 19th century astronomy - Fl 4 Aquarius

 Nature August 12^th 1875

The Binary star 4 Aquarius

If good measures if this stars are practicable during the present season, an idea of the form of the orbit may perhaps be obtained. Dawes’s series of epochs will be material service in this respect; without them, doubt might have been occasioned by the two discordant epochs of Madler, which may have been owing to distorted images at low altitude.

The object is certainly one of considerable difficulty, and really trustworthy measures are perhaps only to be expected from practised observers in command of instruments of excellent definition. In Barclay’s second catalogue it is described as just elongated in the direction 144 degrees, with power of 450 on the 10 inch refractor at Leyton at th epoch 1865.74; this angle shows direct progress, very much in accordance with Dawes’s measures. Possibly the companion may now be found nearly due south of the primary.

                                                      www.theramblingastyronomer.co.uk

A little ramble through Libra the Scales

 A small faint constellation of the zodiac, the ancient Greeks knew it as the ‘claws of the scorpion’ an extension of the neighbouring constellation of the Scorpion, rather than the scales we see it as today.

However, the Romans made it a separate constellation at the time of Julius Caesar. Since then the scales of Libra have come to be regarded the symbol of justice held aloft by the goddess of justice Astraea.

The Arab astronomers knew these stars as Al Zubana or the Claws. Syrain astronomers regarded it as Masa’tha the scales the Persians also saw  a set of scales but called it Terazu.

In India it was Tula the balance while in China it was known to early astronomers as Show Sing the Star of Longevity bit later it became Tien Ching the Celestial Balance.

Alpha or Zubenelgenubi which means the ‘Southern Claw’ is actually the second brightest star with a magnitude of mag 2.7 lying at a distance of 77 light years. Zubenelgenubi is a F3 class star. A pair of binoculars will reveal that alpha is actually a double star.

Beta or Zubeneschamali or ‘Northern Claw, is actually the brightest star at magnitude  2,6 lying at a distance of 185 light years. Zubeneschmali is a B8 class star.

Gamma or Zubenelakrab or ‘Scorpion’s Claw’ magnitude 3.9 and a G8 giant star lying at a distance of 163 light years. 

Ther are no clusters or galaxies brighter than magnitude 9 in Libra

                                                     www.theramblingastronomer.co.uk

Cooke Telescope Tales -Transit of Mercury May 7th 1878 & 1924

Mercury is the closest planet to the Sun in our solar system and there will be times that it will pass in front of the Sun and can be seen as a small dot slowly moving across the face of the Sun. This is a Transit of Mercury, they occur on average 13 times per century, the last was in November 2019 the next will be in 2032. 

Here is a little-known astronomical fact, two transits of Mercury separated by 46 years which occurred on the same date and were both seen using Cooke of York telescopes. 

The transit of Mercury on May 7^th 1878 (it was May 6^th in the UK) was observed at 06 hours and 40 minutes as the Sun rose in Australia, with Mercury already halfway across the surface of the Sun, this observation was made by W J MacDonnell at Sydney using a 4.25 inch Cooke telescope. 

Then 46 years later in 1924 also on May 7^th A F Bennett this time using a 6 inch Cooke telescope started observing a Transit of Mercury from 16 hours and 57 minutes from his home in Suffolk. 

Although he lived in Suffolk, he was actually born in Goole East Yorkshire and was educated at Bramham College.

www.theramblingastronomer.co.uk

Cooke Telescope tales - York Exhibition 1881

 Yorkshire Gazette Saturday 7^th May 1881 

York Exhibition 

In the space intervening between the central and Great Halls, a large equatorial mounted telescope which stands 15 feet high is exhibited by Messrs T Cooke & Sons York opticians, the instrument which is an object of curiosity with an object glass of 10 inches.

 

The sale price is £1200 (my note; today that telescope would cost over £186,000)

                                                         www.theramblingastronomer.co.uk

A little ramble through 19th century astronomy - Messier 11

 Nature August 5^th 1875

The Great Cluster messier 11

As the first special publication of the Observatory of Hamburg, we have Prof. Helmert’s memoir detailing the results of his micrometrical observations of the components of this well-known cluster in the constellation of Aquila or in Clypeum or Scutum Sobieski, as many of the continental astronomers continue to call that part of the heavens which it is situate.

The memoir has a particular interest from the circumstance of Dr Lamont having similarly employed the Munich refractor in the years 1836-39.The investigation of any changes that may take place in the constituents of these groups of stars, as regards position or brightness, becomes a very attractive one, and as we know from the excellent work of Heer Pihl on the Perseus Cluster, it is not one always requiring the use of large instruments, such as have been employed in the hands of Lamont and Helmert, upon Messiewr 11.

D’Arrest terms this cluster ”magnifica innumerabilium stellarum coaservatio”; the amateur will remember Admiral Smyth’s comparison of the configuration of the components  to “ a flight of wild ducks”

                                                       www.theramblingastronomer.co.uk