January 21st 2019

Monday 21st January from about 4 to 6 am

Club members gathered at 4:15 on Patricks Hill to witness a total eclipse of the Moon.  Totality lasted from 4:40 to 5:11.  After an unpromising start they were rewarded with a moderately clear night.

21st January 2019

A total lunar eclipse will take place on 21 January 2019 UTC (Coordinated Universal Time). For observers in the Americas, the eclipse will take place between the evening of Sunday, January 20 and the early morning hours of Monday, January 21. For observers in Europe and Africa, the eclipse will occur during the morning of January 21. The eclipse will occur during a supermoon. It will also be the last total lunar eclipse until May 2021.

The eclipse will be visible in its entirety from North and South America, as well as portions of western Europe and northwest Africa. From locations in North America, the eclipse will begin during the evening hours of January 20. Observers at locations in Europe and much of Africa will be able to view part of the eclipse before the Moon sets in the early morning (pre-dawn) hours of January 21.

Contact points relative to Earth’s umbral and penumbral shadows, here with the Moon near its descending node

The timing of total lunar eclipses are determined by its contacts:

P1 (First contact): Beginning of the penumbral eclipse. Earth’s penumbra touches the Moon’s outer limb.
U1 (Second contact): Beginning of the partial eclipse. Earth’s umbra touches the Moon’s outer limb.
U2 (Third contact): Beginning of the total eclipse. The Moon’s surface is entirely within Earth’s umbra.
Greatest eclipse: The peak stage of the total eclipse. The Moon is at its closest to the center of Earth’s umbra.
U3 (Fourth contact): End of the total eclipse. The Moon’s outer limb exits Earth’s umbra.
U4 (Fifth contact): End of the partial eclipse. Earth’s umbra leaves the Moon’s surface.
P4 (Sixth contact): End of the penumbral eclipse. Earth’s penumbra no longer makes contact with the Moon.

The penumbral phases of the eclipse changes the appearance of the Moon only slightly and is generally not noticeable.

Source: https://en.wikipedia.org/wiki/January_2019_lunar_eclipse


January 14th 2019

On Tuesday Near-Earth asteroid 433 Eros makes its closest approach to Earth since 2012 today, when it comes within 19.4 million miles (31.2 million kilometers) of our planet. It glows at 9th magnitude all week and will be bright enough to see through small telescopes. The asteroid resides about 10° southwest of brilliant Capella this evening, a region that lies high in the east after darkness falls. Be sure to catch Eros sometime this month — it won’t be as close or as bright again until 2056.

Source: http://www.astronomy.com/observing/sky-this-week/2019/01/the-sky-this-week-from-january-11-to-january-20


31st December 2018

Update: The Ultima Thule flyby was a complete success!

An excellent start to the New Year, the New Horizons probe will flyby Ultima Thule, which will be the most distant object a space probe has ever explored. Ultima Thule is a tiny rock orbiting roughly 4 billion miles (6.5 billion kilometres) from the sun.

“We’ve never in the history of spaceflight gone to a target that we’ve known less about,” Alan Stern, principal investigator of New Horizons and a researcher at the Southwest Research Center in Colorado, told reporters Sunday (December 30th).

But when the spacecraft arrives, it will turn a suite of instruments onto the mysterious object, and many of its mysteries will be unveiled. It’s the second historic rendezvous for New Horizons, which zipped by Pluto in July 2015, the first ever flyby of Pluto.

New Horizons will fly only 2,200 miles (3,500 km) above the surface of the KBO, three times closer than it buzzed Pluto. To help conserve power, several components of the spacecraft will be temporarily turned off, according to Chris Hersman, Missions Systems Engineer at JHU APL. The student dust counter, which picks up roughly one micrometer-sized dust particle per day, and the transmitting portion of one of the radio transmitters. By turning off these tools, the spacecraft will be able to operate its scientific instruments.

In the hours leading up to the flyby, the spacecraft will be pointed at Ultima Thule, unable to communicate with Earth.

“We can’t be in contact with the spacecraft and get data,” said Alice Bowman, New Horizons’ Mission Operation Manager.

Whatever New Horizons reveals, it will definitely be something that has never been seen before.




24th December 2018

Isaac Newton was born in 1643 in Woolsthorpe, England. His father was a wealthy, uneducated farmer who died three months before Newton was born. Newton’s mother remarried and he was left in the care of his grandmother.

Newton became interested in mathematics after buying a book at a fair and not understanding the math concepts it contained. Newton graduated with a bachelors degree in 1665. The further pursuit of an education was interrupted by the plague. Trinity College was closed due to the highly contagious, deadly disease. Newton went home. It was during this time that Newton started to pursue his own ideas on math, physics, optics and astronomy. By 1666 he had completed his early work on his three laws of motion. The university reopened and Newton took a fellowship in order to obtain his masters degree.

As the years progressed, Newton completed his work on universal gravitation, diffraction of light, centrifugal force, centripetal force, inverse-square law, bodies in motion and the variations in tides due to gravity. His impressive body of work made him a leader in scientific research. However, in 1679 his work came to standstill after he suffered a nervous breakdown. Upon regaining his health Newton returned to the university. He became a leader against what he saw as an attack on the university by King James II. The king wanted only Roman Catholics to be in positions of power in government and academia. Newton spoke out against the king. When William of Orange drove James out of England, Newton was elected to Parliament. While in London he became more enchanted with the life of politics than the life of research. After suffering a second breakdown in 1693 Newton retired from research. He became Warden of the Royal Mint in 1696. He became Master of the Royal Mint in 1699. Newton was very instrumental in developing techniques to prevent counterfeiting of the English money.

Throughout Newton’s career he was torn between his desire for fame and his fear of criticism. His overwhelming fear of criticism caused him to resist immediate publication of his work. As a consequence Newton often felt compelled to defend his work against plagiarism. One such dispute arose over calculus. Though Newton had been the first to derive calculus as a mathematical approach, Gottfried Leibniz was the first one to widely disseminate the concept throughout Europe. The dispute with Leibniz dominated the last years of his life. Newton died in 1727.

Source: https://starchild.gsfc.nasa.gov/docs/StarChild/whos_who_level2/newton.html

But was he really born on Christmas Day?

Newton was born in England on Christmas Day 1642 according to the Julian calendar, the calendar in use in England at the time. But by the 1640’s, much of the rest of Europe was using the Gregorian calendar, (the one in general use today); according to this calendar, Newton was born on Jan. 4, 1643. So we have this ambiguity where Isaac Newton could have correctly stated during his entire life that he was born on Christmas day, but according to our modern calendar this is not the case.

Nevertheless I couldn’t resist the idea of having someone of such great importance to astronomy linked with Christmas day, so I’m saying that Isaac Newton was (sort of!) born on Christmas day.




Space News – December 17th 2018

Josep Comas i Sola (17  December 1868 – 2 December 1937) was a Spanish astronomer and discoverer of minor planets, comets, and double stars. He was born of Catalan origin in Barcelona.

He wrote his first astronomy notes at 10, and was only fifteen when he published an article in a French specialist magazine.

He observed planets including Mars  and Saturn, measuring the rotation period of the latter. He wrote some books popularizing astronomy, and was first president of the Sociedad Astrónomica de España y América. He discovered the periodic comet 32P/Comas Solà, and co-discovered the non-periodic comet C/1925 F1 (Shajn-Comas Solà); he is also credited by the Minor Planet Center with the discovery of 11 asteroids during 1915–1930. Comas i Solà is also credited with the discovery of the double star SOL 1.

In 1905, Solà received the Prix Jules Janssen, the highest award of the Société astronomique de France, the French astronomical society. In 1907 he claimed to observe limb darkening of Saturn’s moon Titan, the first evidence that the body had an atmosphere. He was the head of Fabra Observatory since it was established in 1904.

The asteroids 1102 Pepita (from his nickname Pepito) and 1655 Comas Solà are named after him.


Wikipedia: https://en.wikipedia.org/wiki/Josep_Comas_i_Sol%C3%A0#cite_note-6


Space News – December 10th 2018

On Thursday, 13th December, Comet 46P/Wirtanen will make its closest approach to the Sun, at a distance of 1.05 AU.

From Cork, it will be visible in the evening sky, becoming accessible at around 17:51 (GMT) as the dusk sky fades, 19° above the eastern horizon. It will then reach its highest point in the sky at 22:22, 46° above the southern horizon. It will continue to be observable until around 03:12, when it sinks to 18° above the western horizon.

Source: https://in-the-sky.org/news.php?id=20181213_18_100


Space News – December 3rd 2018

On December 7th, Mars and Neptune will share the same right ascension, with Mars passing 0°02′ to the north of Neptune.

At around the same time, the two objects will also make a close approach, technically called an appulse.

From Cork, the pair will be visible in the evening sky, becoming accessible at around 17:04 (GMT) as the dusk sky fades, 27° above your south-eastern horizon. They will then reach its highest point in the sky at 18:28, 30° above your southern horizon. They will continue to be observable until around 22:40, when they sink to 10° above your south-western horizon.

Mars will be at mag 0.1, and Neptune at mag 7.9, both in the constellation Aquarius.

The pair will be close enough to fit within the field of view of a telescope, but will also be visible through a pair of binoculars.


Source: In-The-Sky.org


Space News – 26th November 2018

Insight, short for Interior Exploration using Seismic Investigations, Geodesy and Heat Transport, is the first outer space robotic explorer to study the crust, mantle and core of Mars. Studying Mars’ interior structure answers important questions about the early formation of rocky planets in our inner solar system as well as rocky exoplanets. Insight will also measure tectonic activity and meteorite impacts on Mars today. This mission is part of NASA’s Discovery Program for highly focused science missions that ask critical questions in solar system science.

The rocket that launched Insight also launched a seperate NASA technology experiemt: two mini-spacecraft called Mars Cube One, or MarCO. These briefcase-sized Cubesats fly on their own path to Mars behind Insight.

Insight seeks to uncover how a rocky body forms and evolves to become a planet by investigating the interior structure and composition of Mars. The mission will also determine the rate of Martian tectonic activity and meteorite impacts.

Source: https://mars.nasa.gov/insight/mission/overview/

UPDATE: Insight has successfully landed on the Martian surface.


Space News – 19th November 2018

Hendrik Christoffel van de Hulst was born on November 19th 1918 in Utrecht, the Netherlands. He predicted theoretically the 21-cm (8.2inch) radio waves produced by interstellar hydrogen atoms. His calculations later were of great help in mapping the Milky Way  Galaxy, and were the basis for radio astronomy during its early development.

In addition to his work in radio astronomy, he made important contributions to the understanding of light scattering by small particles, the solar corona, and interstellar clouds. From the 1960’s Van de Hulst became a leader in international and European space research and development efforts.

Van de Hulst died on July 31st 2000 aged 81.