Venus Transit - 2012 AD.

A casual person might be enjoying a nice walk to lunch under an overcast sky or just business as usual, but none were aware of what has unfolded right above their heads at that moment.  According to the acceptable 'buzz' of most informed 'earthlings', the atmosphere was more historical than astronomical - between 06:13 to 12:47 (+0800 GMT) 6th June, our beloved evening star Venus passed between us and the Sun.  It's The Venus Transit, a rare event.  Owing to its smaller-inside orbit than Earth, it passed us and from now on, becomes the morning star.

In that event, Venus in its 'inferior conjunction' was only 26.9 million miles from us.  If you are a Venusian, Earth would light up your sky like a  very bright beacon with a 'very shiny moon' beside it - knowing we're a  little bigger than Venus does make one proud.  If you just knew what it's like to be on the surface of Venus, believe me, you will be proud that you are an earthling!  I'm not writing a science journal (you can read that elsewhere) but after surviving much anxiety from the cloud-filled skies and being drenched in sweat from producing these shots, that day something significant did happened above us.

You don't know how hot it is to set-up for this event! With sweat dripping off your eyebrows and forehead - you want to constantly wipe it off to look through the lens.  This is my 'DIY solar filter' aka survival blanket over the scope in which the results are in the photos below. 

Taken with my iPhone 3GS through the telescope lens

For your pleasure, NASA took this photo from a telescope in space.  Thanks, NASA!

See you in the morning Venus!

The Orion Nebula (M42).

The Great Orion Nebula - M42

The Orion Nebula as seen from my 102mm (4-inch) cassegrain-maksutov telescope, the Celestron Nexstar 4 SE.  It is the easiest, brightest  nebula that can be seen with the naked eye.  More normally be better seen with a simple binoculars, one can see it as a 'bright-whitish' cloud located in the constellation of Orion; which within itself has many messier objects and other nebulas like the Horsehead Nebula and the Witchhead Nebula.  The photo above is a 'flipped image', a trademark of all cassegrain reflector telescopes.  Just 'flip' the image like a page to the left, and you'll have the correct orientation.  See 'Telescopes' for other examples and explanation

The constellation of Orion with the Orion Nebula (lower middle).

Latest Images 2 - Saturn

Wide angle of Saturn, overexposed to show its moons.

Saturn. (00:40 +8 GMT) 2/4/12

Latest Images - Saturn

Looking East

Spica, (right) in the constellation of Virgo and Saturn (left). 23:30 (+8GMT) 2/4/12

Overexposed image showing Saturn's 4 moons, and possibly a fifth hidden by the glare.

Clear skies does carry a new meaning, in that it usually means sacrificing comforts - mosquitoes, the heat and humidity for now!  Clear skies it was - cloudless skies.  I got out my scope and all my gear and stuff alike to brave the heat and 'little blood-sucking friends' Mr.Mossie!  But it was worth it.  The Opposition of Saturn will be on the 15th of April.  Which means Mr. Gas planet no.2 will be closest to Earth in its orbit this month.  More images will be up soon so watch out.  See also 'Planet Hunt' for other planets.

How Big is BIG - Antares

 

Antares, in the Constellation of Scorpius rising in the SE. (March 2012).[/caption]

We've seen Betelgeuse in 'How Big Is BIG?'.  The super-giant star Antares sits to the lower-left of M4 (NGC6121), the globular cluster in the Constellation of Scorpius.  They are mainly observed in young galactic structures such as open clusters, the arms of spiral galaxies, and in irregular galaxies.

Classed in the 'red' category, its other popular counterpart, Betelgeuse are called old stars and are much cooler that 'blue' stars.

It is about 550 light years away from Earth and its luminosity is measured at 65,000 times brighter than that of our Sun.  Notice the comparison between Arcturus and Antares in the diagram below.

Also known to ancient astronomers as one of four Royal Stars including, Aldebaran (East), Regulus (North) and Fomalhaut (South).

Antares in comparison to the other giant stars.

How Big is BIG - Arcturus

 

Arcturus, the giant star.

Arcturus, the third brightest star in our night sky after Sirius and Canopus, sits in the Constellation of Bootes, or also known as 'Bootes the Herdsman'. As of now in the month of April in conjunction with the early rise of Saturn (near Spica), just look left towards ENE, this hugh star presents itself without any hassle.

Distance to Earth is about 36.7 light years away.  Not completely a 'red' star but somewhere in between would prove just right - an orange giant star.  See 'How Big is BIG' for comparison between Arcturus and Betelguese - don't fall of your chair!   Next up, Antares! Feel free to share your comments. Clear skies.

Size comparison.

How Big is BIG - Betelgeuse

Defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in a space in one year.   1 light year = 6 trillion miles (10 trillion km)

 

Betelgeuse, the red supergiant.

One of my 'favourite stars' to shoot when I was at sea long time ago - I will blog about it some other time!  And also one of the most popular stars in the skies.

Currently measured to be 640 lights years away from Earth, in the 'Red supergiant' class, Betelgeuse.

'Red', because its old (by astronomical standards) and cooler than 'Blue' stars, hence blue stars are hotter.

Comparison between Betelgeuse and our Sun.

Our Sun is only 1 pixel compared to Betelgeuse in the above illustration.  Look at the 'arrow' underneath Betelgeuse.

Its position in 'Orion'.

What is Big?

If Betelgeuse is as big as Wembley Stadium, then our Sun is just a 'small pebble' on the field!

If you fit Betelgeuse in the middle of our Solar system, then its diameter is as big as from the Sun all the way past the asteroid belt, possibly till Jupiter's orbit!

More Nights Like This.

 

When will it be like this again? Soon maybe?

Cowboys and Asteroids.

Yeee-hah!! Cowboys and Indians?  Nope.  This week’s thoughts are on cowboys chasing NEOs.
That’s right, ‘Near Earth Objects’ or NEO.  Looking into deep space is not the only thing you do with a telescope but another ‘rush’ amateur astronomers do is identifying objects that ‘pass near’ to Earth’s orbit.  Namely, asteroids, comets and minor planets. Scientist deduced that they are remnants from the time our planets were formed.

How to find them?  Fortunately, some people have done their ‘homework’ and plotted out the paths of these objects as they make their way around in space.

1.  Look-up the time-schedule of all these objects from a good prediction software online.   A good one is the IASC (International Astronomical Search Collaboration) website.  This is the Asteroid Observer’s Planner.

2.  Choose which asteroid, or any other published object you want to track from the Planner.  Time, magnitude, position in the sky.

3.   If you have a good filter for your lens, It’ll help make the object ‘stand-out’ in you view.

4.   Normally asteroids and comets appear as a ‘thin line’; unlike stars which appear as a ‘dot’.

5.   Take a few photographs within few hours apart to search for any object that has moved within your FOV (Field of vision)

6.   Make a sketch map of the search area. Note down all observations, put an entry into your journal for future records.

7.   Do not choose an object at your zenith (above your head).  Avoid angles from 80˚ - 90˚ of Declination.  Refer to RA (Right Ascension) and Declination from the planner.

Give it a try?  Why not!  Clear skies please.

Next up, Tracking orbiting satellites, space junk and ISS (International Space Station).  You’ll be notified when this happens.

Jupiter & Venus - Transit

Who says the number 13 is an unfortunate number.  March the 13th is the best of times because after an overcast and cloud-filled skies above me never seemed to open up.  But the sudden appearance of my 'two friends' suddenly said 'Hi' through my gloomy spell.

Both continue their journey westward, pulling away 1˚ each day now.

Jupiter (left), and Venus. 8:30pm

The close coincidence of Venus and Jupiter in conjunction, (or transit) the steep angle of the ecliptic and Venus’ greatest evening elongation keeps these worlds up for several hours after dark – and ensures  a beautiful gathering of worlds in the western evening sky this month. They are well worth getting outside to see.

Bottom line: Venus and Jupiter are in conjunction on March 13, 2012. This is the best evening Venus-Jupiter conjunction for years, as seen from different parts of the hemisphere.  Venus and Jupiter stay out for nearly four hours after sunset. Venus and Jupiter are close throughout the month of March 2012. They are like twin beacons – two very bright planets – near each other in the west as soon as the sun goes down. (Excerpt from EarthSky.org)

Other than Messier and Caldwell objects, running parallel to these are my quest for 'Near-Earth objects'.  Or a layman would say, asteroids and comets.  And not-so-distant away, the imminent hunt for orbiting satellites and other space junk would not be foreign as before.

So lookout for my posts, as they say, 'will arise from the East' and you know it's here!

Clear Skies Please.

I has been 'gloomy' since my last quest ended with that shot on Venus and 'The Three Friends'.

(Read my earlier blogs)  Seeing conditions are poor, as in cloudy and more towering nimbus clouds at times.  Or,..cold, whispy clouds of altostratus, cirrostratus dancing away high where some may call it beautiful.

For now, my gear is sitting on my table....checking, checking and re-checking, warming up for the next clear skies.  The conjuction of Venus and Jupiter will happen next week - 13th March.Clear skies pleeeeease!

How To Open the Nexstar 4 SE

Use a small 'Philips' screwdriver to remove your finder scope. Fig.1

Make sure you mark your screws before removing them using any sort of 'marker' that wouldn't be rubbed off by your fingers.  You would want the same screws to go into the same hole, and the correct tension, hence the 'marker'. Fig. 2

Also, it makes sense to mark all three screws differently.  You can mark all three screws 1, 2, 3.  I 'dot' mine accordingly.  Fig. 3

Then you can proceed to remove all three screws and 2 screws that secures the quick-release 'slider' to the rear housing.  No need to unscrew the screw at the front end of the slider. Fig. 4

Once all the necessary screws are removed and stored safely, slide out the tube and the rear housing apart slowly and carefully not letting the 'inner tube' touch the body of the scope. Use your common sense!

Store and cover the rear cell away safely from arms reach (you do not want it to roll away do you?).

Again carefully not touching anything of the mirror or tube assembly! Fig. 6

Hold the tube with the opening facing 'down' so any dust would just drop away while you use the 'puffer' as I called it. Fig. 7

If your hands are small enough you could use the soft lens brush to brush lightly away on the 'corrector lens'.

Once again be gentle and use very, very light strokes.  Make SURE your brush is CLEAN and free of particles!!

'Stand' the tube like this Fig. 8 so dust would not enter the tube as you work away on the other part of the telescope.

Now we come to the mirror.  The object is that you don't want scratches on the mirror!  So use light strokes for dust particles that seem to 'stick' on the mirror.  Fig. 9

You can use the 'puffer' first to blow away the particles. Fig.10  Whichever way you can alternate between them.  Use the 'puffer' at an angle to the surface whether its the mirror or the front lens you're cleaning, so dust is removed effectively away from the surface.

A word on using the lens brush, brush on the surface as if you're almost touching it. Remember that you want to remove the particles and not 'pressing' them onto the glass while you swipe away.

Fig.11 At times I would also clean the angled-mirror inside from the lens barrel.  The same goes through the rear of the cell where you'd screw the 'T-Adapter' at the back - remembering to hold the rear cell pointing downwards for the dust to fall through.

Give it a soft and gentle sway of left to right motion to let any residue fall away. A gentle 'shake' would also do the job.

NOTE: For an 'un-opened' Nexstar 4SE

NEVER..ever use a vacuum cleaner's hose and suck dirt from the opening of the rear cell!! Fig.12

I've read from a forum that someone did that and guess what? I did it! Foolish me!

By doing so, all the dust or whatever that's at the back of every corner of the rear cell is going to get sucked into the main tube and get stuck to the back of the 'corrector lens', then you're a goner!!  The suction power will multiply through the secondary tube inside the telescope's main tube.  My heart dropped when I saw my corrector lens was full of dust particles stuck on the corrector lens.  That is how I dared to learn to open my one-week new 'baby' and cleaned it.  I wanted to clean it because of a speck of dirt that I saw on the lens.  Of course I managed to find someone who did open his Nexstar 4 SE on YouTube.

Lastly, I didn't post anything on using lens-cleaning liquids here, especially on cleaning the main mirror.  You shouldn't be touching it anyway!

But I did use some alcohol dropped onto a lint-free soft cloth (camera or spectacle cloth) and folded without any nasty crease on it.  Just straight folds.  I 'puffed' the mirror first to make sure I would not scratch it when I wiped it with the cloth.  And that's it!  I just imagined that I was an archeologist dusting away some precious artifact - that's how you should do it.  With greatest care.

I'd like to remind you again that I only cleaned using the the alcohol twice, only after my foolish act and none after that.  Like I mentioned, you've got no business letting your fingers wander near the mirror, all because the focusing screws are behind that mirror.  Never put pressure on the mirror, or any parts inside the tube and rear cell.

The Nexstar 4 SE is known for its 'no collimation needed' assurance. So if any of its assemblies are 'off' by your mishandling, then its back to the dealers for adjustments - minus your warranty and plus whatever costs needed!!

Re-assembling is easy enough.  Just reverse the process, carefully as you go along and lastly screw it back to its mark.  Hope my 'foolish' adventure helps.  'Curiosity Kills the Cat.'  Clear skies!!!

 End note: I did checked with the dealers that sold me the scope about my 'dirt', and they say it's nothing to worry about as it wouldn't have any detrimental effects as far as viewing is concerned.  So no worries!!

My Precious.

The clouds cleared, and there it was.  Fortunately, I've checked the weather - it was good!!

6th February, the end of Chinese New year.

Out came the Moon, home alone and nowhere to go but to marvel at the beautiful face of 
'My Precious'.  All is quiet but the smell of burnt powder from some distant fireworks.

Awesome!

One night I was just stargazing with my new scope, and right at the corner of my vision I 'see' this blueish dot coming in and out of my view.  I trained my scope to the apparent area FOV (field of view) and tried looking to the sides of this object and by the time I did that, my eyes had adjusted to the darkness. And lo and behold!! I saw my first Nebula called the Ghost of Jupiter - or scientifically called NGC 3242.

Taken by 4" Nexstar 4SE Schmidt-Cassegrain computerised telescope - Celestron

Neximage USB camera.  This is what I see through the lens. 

This planetary nebula NGC 3242 is most frequently called the Ghost of Jupiter, or Jupiter's Ghost, but it is also sometimes called the Eye Nebula. It can easily be observed with amateur telescopes, and appears bluish-green to most observers. Larger telescopes can distinguish the outer halo as well.^[3]

This is what the nebula supposed to look like, taken from a 16" hypergraph telescope.  

Be reminded that mine is only a 4" telescope!

And this is what it looks like taken from Hubble Space Telescope

Moon Craters

Out came the moon and I whipped out the telescope, punched in the coordinates of my locality into the handheld computer and away it went - slewing to the moon!  It was a clear night, so forget about shooting the stars.  The Moon is just too bright.  But look at those craters!!

Lunar Eclipse 2011

It's starting!

Closeup

2011, the year of the Red Moon.