Our session at Toa Payoh Central on 31/12

Alright, this is for sharing of your observation experience. Or, if you are arranging gatherings, star-gazing expeditions or just want some company to go observing together, you can shout it out here.
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harlequin2902
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Our session at Toa Payoh Central on 31/12

Post by harlequin2902 »

Hi all,

We had a small observing session over at Toa Payoh Central too. I was joined by Zong Yao, Richard (not Airconvent) and the occasional family or passer-by.

Though the sky was very clear when I looked out of the window at 8pm, huge clouds came out of no where just after I brought everything down at around 8:30pm and the whole sky was covered. It took approximately an hour's wait before our primary target, Saturn finally appeared through a gap in the clouds.

From there, we were "see-sawing" between Saturn and the Moon : when clouds moved in to cover Saturn, the area where the Moon was in cleared..then when the Moon was covered, Saturn re-appeared from behind the clouds again ! :lol: :lol: :lol: You should have seen the way the scope was manouvered to observe these 2 targets - like a see-saw ! :lol:

Around 10:30pm, the sky suddenly cleared completely. All the clouds just "disappeared" ! And this was also the time where we experimented with various combinations of barlow and eyepieces we had with us...we even managed to go up to 1143x :shock: magnification on Saturn with a 4mm + 2x barlow + 3x barlow ! (well, you only get about one good chance like this per year... so why waste it ? :lol: ) At this mind numbing magnification, at least we could still identify Saturn, it's rings, the main belt and a bit of the Cassini Division, but the image was already breaking down and the occasional light breeze added to the challenge of getting a clean focus and a steady image. At 1143x, Saturn was HUGE and stretched across nearly 75% of the Radian's 60 deg AFOV. My RA drive also decided not to work even though I did replace the battries with brand new ones in the afternoon, so observing at high magnifications wasn't a really pleasant experience as we had to pause after every few seconds to get the object back into view. Also, all 3 of us agreed that the Vixen GP couldn't really handle the scope very well, and vibrations introduced by the wind or from focusing at high magnifications (3XX - 4XX) and adjusting the slow motion knobs took a longer than desired time to damp out.

The brightly lit environment of Toa Payoh Central made it impossible to do any comet hunting or serious deep sky viewing (we did had a brief look at M42 when it was directly overhead), so we were only restricted to Saturn, Jupiter and the Moon. All were superb. We did have a great time exploring the Moon didn't we, Zong Yao ? :lol:

From 1am onwards, we turned our attention to a rising (and *ugh* boiling) Jupiter, and we had to wait till 2am before we managed to get a better and steadier image. Just before we packed up, we managed to catch the GRS that was slowly rotating into view. It was about 2:45am when we our session ended. Wow, so we actually spent 6 solid hours standing around the scope in the middle of Toa Payoh ! A great way to end 2003 and cross into 2004 huh :lol:
Samuel Ng
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Post by zong »

Yea, the session at toa payoh was fun although the (very, very, very, very...) bad light pollution plagued us in the observations. But Samuel's MN56 proved to be superb, and gave me the super staggering view @ 1143x! It was nothing I ever saw, only it would be better if the motor drive worked, then we wouldn't have to keep putting Saturn back into view..

The moon was another great fun, although my school has a C8 which offers 2000mm focal, it could not beat the MN56! We explored the moon, and in it we saw really fun things, like the mountains, and a pattern of 5 craters looking like a monkey face :lol: :lol: :lol:

And finally when jupiter came up we did see it with much fun, experimented with different eyepiece and barlow combinations, and we also saw the GRS spin into view slowly but nicely..

Oh ya! Samuel forgot one very fun thing we did, to challenge the MN56! We went into the orion nebula in high magnification up to 400x, to search for the 'E' and 'F' stars in the trapezium! I only managed to see one though, but didn't know whether it was E or F, as the scope was really quite wobbly.

The 6 hours at Toa Payoh was crazy indeed, but a very novel and interesting way for us to move from 2003 into a great new year. Hope in this year we have more of such nights to come! :D
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harlequin2902
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Post by harlequin2902 »

Oh ya! Samuel forgot one very fun thing we did, to challenge the MN56! We went into the orion nebula in high magnification up to 400x, to search for the 'E' and 'F' stars in the trapezium! I only managed to see one though, but didn't know whether it was E or F, as the scope was really quite wobbly.
Yeah, pity. I guess a beefier mount is required someday, but I'll just have to make do with what I have now. We have to bring the scope down to Dempsey Rd one day. The numerous dwarf buildings in the area will help to keep the full force of any wind away from the setup. Toa Payoh is just too open.

You'll be guaranteed more of such nights this year. Afterall, yesterday was only the very beginning :lol: Really looking forward to the next trip to Mersing (first trip of the year !) too 8)
Samuel Ng
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Post by elton »

erm... 400x to see the E & F of trapezium seems a little excessive especially since the limited aperture of the MN56 will make them really dim. Try 150 to 200x instead.
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harlequin2902
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Post by harlequin2902 »

I checked with a blown up diagram of the trapezium, and confirmed it was 'E' which we saw.

I can't remember if the mag which we actually spotted 'E' at was around 400x (but I'm certain we did go up to 400x to study the 4 trapezium stars), because we switched eyepiece/barlow combinations pretty rapidly while concentrating on what is being seen through the eyepiece and not so much on how much magnification was used. So when we finally managed to catch 'E', it could have been around 200x like you said, with the 2x barlow removed.

If possible, will try again tonight to confirm (and look for 'F').
Samuel Ng
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