So Friends, let’s have a look at whats up for September, 2018 in the sky?
This month will be dominated by the Milky Way and the Planet Parade. Look in the south western sky just after sunset to catch Venus. See along the ecliptic, from the west to south to the eastern sky to observe Jupiter, Saturn and Mars all through this month.
Through binoculars or a telescope, you can catch Venus’s phase change dramatically from nearly a half phase to a larger thin crescent.
We also have beautiful constellation trail this month- Sagittarius, Aquila, Cygnus and Lyra. Although we don’t have any meteor showers this month you may enjoy the M4 Globular Cluster in Scorpius, Lagoon and Trifid Nebulas in Sagittarius and The Beehive cluster in Cancer if you can get your hands on a small telescope or a pair of binocs. You may even think of hunting for the Andromeda Galaxy if you can stay up for a couple of hours after midnight.
That’s all for September, ’18. Clear skies!
Let’s have a look at whats up for August, 2018 in the sky?
This month’s prime attraction would be the Perseids Meteor Shower. The Shower will reach its peak at midnight on 12th August. Best observations can be made on the days of and around the peak. Another factor making it beautiful is that the day of peak shower would be a moonless one. The radiant of this shower is the constellation Perseus. At last this month will be followed by the parade of planets- Venus, Jupiter, Saturn and Mars.
Hope you have a great month ahead. Clear Skies!
A team of astronomers from the Inter University Centre for Astronomy & Astrophysics (IUCAA), Indian Institute of Science Education and Research (IISER) and two other universities have recently discovered ahuge galactic supercluster of galaxies 4 billion light-years away.
Galaxies travel along the filaments of the cosmic web and form dense groups of tens and thousands of galaxies called superclusters. Our own Milky Way galaxy is a member of the “Laniakea” supercluster.
Named “Saraswati,” after the river ‘Saraswati’ and the Hindu goddess of knowledge, art and wisdom, this galactic supercluster is by far one of the most massive large- scale structures ever discovered. Located in the direction of the constellation Pisces, the “Saraswati” supercluster of galaxies is as big as 600 million light-years and is thought to be equivalently heavy as 20 million billion mighty Suns!
Since light takes time to travel across space, so light from faraway galaxies help us take a peek back in time. Making it easy, light from a galaxy 10 million light-years away takes 10 million years to travel to us. So, observing it lets us see the galaxy as it was 10 million years back. With the “Sarawasti” supercluster being at a whooping 4 billion light-years away from us, observing this dense distribution of galaxies will help us get an idea of the universe as it was 4 billion years ago (those good ‘ol days when the universe was 10 billion years old).
This huge discovery will help unveil deeper mysteries of the sky which have been tantalizing astronomers and cosmologists for all these years and those to come.
Written by Janmejoy Sarkar || Source : http://www.iucaa.in/News.html
ISS, flying 400km above Earth surface at a speed of 27,500 km per hour is the largest man made flying machine of enormous 100 meter in size. But at that distance, it appears to our eye with an angular size of only 50 arc second. Even smaller than a small marble hold at an distance of around 50 meters. or the distance between Barpost and Mid Field of a football ground. One can well imagine how critical could it be to shoot this when infrequently ISS becomes visible from a specific small patch of Earth Surface as a solid black silhouette against the face of Sun, that too only for 1/2 second, on its way through its own precise orbit around Earth.
This was SWAN's fifth ISS Solar Transit attempt and the fourth successful one. Thanks to all including the local villagers there at the location.
Things to know before you start is what it mean by "Altitude of Sun in sky?"
The solar elevation angle is the altitude of the sun, the angle between the horizon and the centre of the sun's disc.
In simple words it is the position of Sun in height wise in the sky. For example when Sun is rising it is in 0° and as hour pasts it increases its altitude and gain the highest altitude of 90° at the noon time. After that Sun started decreasing it's altitude to 0°, that is the sun going bellow horizon.
Starting time of this transit is 11:12 UTC that means 16:42 IST or 4:42 pm on the 9th of may. Clearly by the timing given we can see it is the time when Sun started going down bellow horizon. So as a rule of nature the Eastern part of country like Assam, West Bengal, Odisha, East part of Tamilnadu and Andhra Pradesh will have Sun in low horizon making it hard to observe. Where as the states like J&K, Delhi, Himachal Pradesh , UP, MP, Telengana, Karnataka will be in much better condition than eastern states. But the good news come for the Western Indian state or the states adjacent to west coast of India, Because Sun will be in much better altitude than the rest of India.
So it's better if you are in western part of India. Now Chose a high roof top or a area where the west horizon is completely clear. It is better if you move out from city area because the SPM Level in the low horizon sky in the city area are much higher. And because the Mercury will appear a tiny dot (.) in the sun disk so you may not resolve Mercury in that condition.
Now that you are completely positioned lest's enjoy the show with a protective eye gear. DO NOT EVER LOOK AT THE SUN WITHOUT ANY PROTECTIVE GALSS / FILETR .
Point to note.
*This picture intend for India only Timings are given in IST the upper figures indicating the Sun's altitude at starting of transit (16:42 IST) & the lower figure indicating the sun set time for that region.
**To get exact timing of your place click here.
In general perception the tip of your little finger will create 1° by holding the hand at right angles to a fully extended arm. And then the size of Sun disk is exactly the half of your finger tip. So you can well imagine how small the Sun appears in our sky. The size of sun then is ~31° means 31 X 60 = 1860" (Arcsecond). The size of Mercury on event day will be 12" so that will appear as 1/300th times of your little finger tip. So you can well imagine the size. For reference look at the picture. If the red line will be the observable size of Sun (By the help of Optical Instruments) then you can find mercury as a dot (.) appearing in the Sun disk.
On 26th of February vast area on Earth surface will find Venus to play hide and seek with our beloved Moon as it will come directly in between of Venus and Earth.
Thus, a Lunar Occultation of Venus will take place.
So what is Occultation ?
When one celestial body hides another one behind it, astronomers call the event occultation. By this definition, therefore, the solar eclipse is a Lunar occultation of Sun.
What will happen on 26 Feb 2014?
If you live in the right where this occultation is visible, Venus will disappear behind Moon through the illuminated part of its edge. After almost two hours, it will reappear through the opposite side of the Lunar disc edge, the dark side. Outside the occultation area, Venus will appear to pass either through north or south of Moon.
Places in Africa, may see the incident in the predawn and/or dawn sky on February 26. And in other place like India and Southeast Asia – it’ll be at daytime. So, for India a Chrystal clear sky is a must to have a chance to see this celestial phenomenon at daytime.
How to observe ?
The occultation will take place at a particular time. That may be dawn for some place or mid-day for some other place. For those places where the occultation will take place on night time or just on the predawn or dawn phase it will be not difficult to see this event as you can clearly locate Venus and Moon on sky if your sky is free of cloud.
But for people in other places, a simple way to check the probability is, if you can see faint and Crescent Moon at around 10am in the morning, you have a have a chance. Target your binocular to that. Immediately after the Lunar edge in the eastern side, you will find Venus. These will come closer very slowly to touch each other. Beginning of the occultation.
Here we present you the latest SOHO image of Sun and ISON.
Clearly visible, ISON, at the upper portion of the image is featuring as a foggy patch only. It has failed to appear with its bright core portion. It looks like ISON is disintegrating now. And it's brightness is decreasing rapidly. We will wait for the scientists to build up their opinions.
But so far our own understanding goes-- we would prefer editing the headline of this post.----
" Here we present you the latest SOHO image of Sun and ISON ... WHAT IT WAS ONCE 'ISON.' "
We might have lost ISON visually, but it will remain in discussion for long because of its unique and dynamic presence in our sky. But to compensate the sharp pain of losing ISON, we have Comet LOVEJOY (C/2013R1) now - visible with its glory. Even a small Binocs can get it to us. The comet is losing its apparent separation from sun fast. means its position in sky is getting closer and closer to sun every day. So, sooner the better. Try it out. We took this LOVEY picture on 1st Dec early Morning.