Tag Archives: Andromeda

Specola Guestbook | June 16, 1924: Knut Lundmark and Sten Asklöf

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This entry is part 76 of 84 in the series Specola Guestbook

Since its founding in 1891, many people have passed through the doors of the Vatican Observatory.  A quick perusal of our guestbook reveals several Names, including Popes, Nobel laureates, astronauts, actors, and saints. Today’s guestbook entry is from June 16, 1924, when Knut Lundmark and Sten Asklöf made a visit. Next to his name, Knut Emil Lundmark (1889-1958) wrote, “Ph.D., Upsala, Sweden.” He had completed his Ph.D. at Uppsala in 1920 and subsequently worked at the Lick and Mount Wilson observatoies. In 1929 he became director of the observatory at Lund University in Lund, Sweden. Lundmark’s scientific work was primarily concerned with galaxies.  He measured the distance to the Andromeda Galaxy in 1919 using  novae as standard candles. [Note: while certain types of supernovae function well as standard candles, novae in general vary in maximum brightness and do not serve the purpose well.] He measured a distance of about 650,000 ly (compared to the modern value of 2.5 million ly), which … Continue reading →

In the Sky This Week – December 3, 2019

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This entry is part 126 of 185 in the series In the Sky This Week

At last night’s meeting of the Warren Astronomical Society, the topic of the Starlink satellite constellation came up during the “In the News” segment, and a groan of dismay could be heard from the entire audience. If you are unfamiliar with Starlink, it is a constellation of potentially tens of thousands of communication satellites created by SpaceX with the goal of providing global high-speed internet – that concept sounds great! Starlink satellites during a meteor shower on Nov. 22. pic.twitter.com/wJVk1qu49E — Patrick Treuthardt, Ph.D. (@PTreuthardt) November 25, 2019 The first time I became aware of Starlink was after the 2nd satellite deployment mission of May of 2019, when 60 satellites were put into a 53° Earth orbit. Almost immediately satellite sightings started pouring in from around the world. Videos show a long trail of lights traversing the sky, virtually painting the orbits of the satellites in your mind’s eye, and literally painting them in the cameras of astronomers and astrophotographers … Continue reading →

Dark Sky Painting 3 Edu-painting

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  August 25th I gave a presentation about the Heritage of Astronomy in Ireland. The event was part of Heritage Week 2018. The talk emphasised the fact that Mayo has some of the darkest skies in Europe, therefore we should embrace that fact.  Our Neolithic ancestors claimed their heritage moments in standing stones and circles. These incredible menhirs are still tactile in the land today. Their heritage moments linking them for centuries to our star and the dark sky heavens above. The audience agreed to be some of the ingredients of my Dark Sky Painting homage.  The dark sky reminds us of our place on Earth  and in the universe.  The dark sky teaches us that we to are part of the landscape.  It is in our sprits as are the flora and fauna that surrounds us in this beautiful county. Our 2018 heritage week  moment. The Edu- Painting The painting shows the view looking to the north-east and slightly … Continue reading →

In the Sky This Week – July 17, 2018

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This entry is part 53 of 185 in the series In the Sky This Week

As Mars opposition nears, the planet shines bright in the southwestern sky before sunrise. I find myself looking out my back window for Mars every morning after I awake. The waxing crescent Moon joins Venus in the western sky near sunset; Jupiter appears more to the south, and is a great observing target for several hours after sunset. The Moon The Moon is a waxing crescent visible in the western sky around dusk. The Moon will be at first quarter on July 20th, after which it will be a waxing gibbous, visible in the southern sky after sunset. The Moon will be a great observing target all week! The Moon will travel across the southern sky all week; the first quarter Moon will appear close to Jupiter in the south-southwestern sky on July 20th. The waxing gibbous Moon will appear very close to Saturn in the south-southeastern sky on July 24th. Observing Target: M31 – The Andromeda Galaxy M31 – … Continue reading →

In the Sky This Week – July 18, 2017

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This entry is part 17 of 185 in the series In the Sky This Week

Venus continues to dominate the morning sky in the east, but appears slightly lower in the sky each morning as it pulls ahead of us in its orbit. The waning crescent Moon will appear near Venus the the star Aldebaran on the mornings of July 19th and 20th. The New Moon will be on the 23rd. Jupiter and Saturn appear in the south-southwestern sky after sunset; Jupiter will appear slightly lower in the western sky each day as the Earth pulls ahead of Jupiter in its orbit. The constellations Pegasus and Andromeda appear low in the northeast sky after sunset; the wispy cloud of M31, the Andromeda galaxy, makes a good target for telescope observers. M31 is the nearest major galaxy to the Milky Way. It is 2.5 million light years distant, and heading straight at us; in a little over 4 billion years, it will collide with the Milky way, and the two galaxies will merge into a large … Continue reading →

High-Definition Panoramic View of the Andromeda Galaxy

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The largest NASA Hubble Space Telescope image ever assembled, this sweeping bird’s-eye view of a portion of the Andromeda galaxy (M31) is the sharpest large composite image ever taken of our galactic next-door neighbor. Though the galaxy is over 2 million light-years away, the Hubble telescope is powerful enough to resolve individual stars in a 61,000-light-year-long stretch of the galaxy’s pancake-shaped disk. It’s like photographing a beach and resolving individual grains of sand. And, there are lots of stars in this sweeping view — over 100 million, with some of them in thousands of star clusters seen embedded in the disk. This ambitious photographic cartography of the Andromeda galaxy represents a new benchmark for precision studies of large spiral galaxies that dominate the universe’s population of over 100 billion galaxies. Never before have astronomers been able to see individual stars inside an external spiral galaxy over such a large contiguous area. Most of the stars in the universe live inside … Continue reading →