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Old Yesterday, 11:52 AM
Dennis
Dazzled by the Cosmos.

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Join Date: May 2005
Location: Brisbane
Posts: 11,817
Quaoar (18.76m) C11 ASI2600MM

Here we have the trail of Quaoar as recorded in 50x60 sec exposures from our back garden in Brisbane on 19th July 2025.

Image #1 is the full field with a full res crop inset showing the trail.
Image #2 is a full res 1280x960 crop around Quaoar.

I downloaded an Ephemeris for 19th July for our back garden and imported it into The Sky X Pro as a custom database (SDB) which plotted the position of this Dwarf Planet in TSX.
Celestron 11 Edge HD at F10
ASI 2600 MM Duo
Paramount MX+
50x60 sec exposures.

Here is some information from SkyTools 4 Imaging.
(50000) Quaoar Dwarf Planet
R.A. 18h39m32.5s Dec. -14°55'59" (2000) in Scutum
Magnitude: 18.76

Orbit Period: 283.5 years
Diameter: 620 - 2000 km
Earth Distance: 41.7 AU
Sun Distance: 42.6 AU
Total motion: 2.80 "/hr PA 263.0°
RA: -69.13 "/day
Dec: -8.24 "/day
Apparent Data for 2025 Jul 19 GMT+10 at Back Garden:
Apparent RA: 18h41m01.6s, Apparent Dec: -14°54'36"

The Sky X Pro gave these results for the full field.
******** ASTROMETRIC SOLUTION RESULTS ********
Center RA (2000.0): 18h 39m 33.10s
Center Dec (2000.0): -14° 55' 54.7"
Scale: 0.5470 arcseconds/pixel
Size (pixels): 3124 x 2088
Angular Size: 0° 28' 29" x 0° 19' 02"
Position Angle: 0° 16' from north through east
FWHM: 4.85 pixels, 2.65 arcseconds
*********************************** ************

Dennis.
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Click for full-size image (QUAOAR-C11-F10-ASI2600MM-50x60secs-AVG-Wins-DBE-NXT-BXT-Crop-1600-FR.jpg)
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  #2  
Old Yesterday, 03:58 PM
Leo.G (Leo)
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Location: Lithgow, NSW, Australia
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AMAZING results as always Dennis!
If I ever lose a grain of sand in my back yard I'll give you a call, I'm sure you are the one person who could find it from Brisbane with your telescope.
I'm guessing you have a nice permanent set up where you don't have to align everything every time you set up and can have precision at all times, it certainly seems like it?
You must also be a very patient person with the remarkable results you get.
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  #3  
Old Yesterday, 04:23 PM
Dennis
Dazzled by the Cosmos.

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Join Date: May 2005
Location: Brisbane
Posts: 11,817
Quote:
Originally Posted by Leo.G View Post
AMAZING results as always Dennis!
If I ever lose a grain of sand in my back yard I'll give you a call, I'm sure you are the one person who could find it from Brisbane with your telescope.
I'm guessing you have a nice permanent set up where you don't have to align everything every time you set up and can have precision at all times, it certainly seems like it?
You must also be a very patient person with the remarkable results you get.
Thanks Leo, but I set up and tear down each night as our back garden is exposed.

However, I have x3 off 12 inch circular concrete pavers sunk into the lawn in which I have drilled shallow depressions where the tripod feet pads sit, so I am reasonably polar aligned once I have everything set up.

In twilight, I run a T-Point Model in The Sky X Pro which slews the scope to say, between 70 and 120 user defined points in the sky, takes a 10 sec image for each slew and then calculates where it is actually pointing to versus where the SW “thinks” it is pointing to.

I use these results to perform an accurate polar alignment and when I then activate T-Point, ProTrack and PEC in TSX, they all help improve the pointing and tracking accuracy.

I am just the dumb operator!

It sounds long winded, but now that I am familiar with the process, it only takes some 30-40 mins and by then it is getting dark enough to begin imaging. Of course I have to go to the gym 3 times a week and lift weights so I am strong enough to carry all the gear outside!

There is something quite soothing in sitting at twilight, preparing for the evening’s session, watching the ‘scope slewing around the celestial sphere taking all these 10 sec calibration images.

Cheers

Dennis.
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  #4  
Old Yesterday, 04:53 PM
Leo.G (Leo)
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Location: Lithgow, NSW, Australia
Posts: 1,606
I had pavers but it was just never accurate enough, you get amazing results for a non permanent set up.
My biggest issue is a sloping yard and clay foundation which I think with constant rain made the pavers move a little, somehow i had it right then I just didn't.
I've since dug a big hole to put a peir in, I have the big pier and I drove 3/4" re-bar into all 4 corners radiating out at 45-60 dergee angle to stabilise the clay a little around 1200mm depth, crossing in the middle (thereabouts). I've had it dug for ages but constant rain and not prepared to get the aggregate in to leave in a sloping driveway and have all of the sand wash out. I'll get to it one day, it would be nice.


Throw in we get our clearest skies in winter and it drops below -10 locally. I was out last Monday in -5 and froze. I must find some gloves.
Your results are still amazing Dennis, even more so for a pack away every night set up.
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  #5  
Old Yesterday, 07:24 PM
Dennis
Dazzled by the Cosmos.

Dennis is offline
 
Join Date: May 2005
Location: Brisbane
Posts: 11,817
Yes - a pier would be good and an observatory even better! Good luck with the project.

Hmm, -5 Deg C, that is on the cool side. I think we only get it to around +5 to +7 on our coldest nights and that's cold enough such that Jack Frost nips at your toes and fingers!

Cheers

Dennis


Quote:
Originally Posted by Leo.G View Post
I had pavers but it was just never accurate enough, you get amazing results for a non permanent set up.
My biggest issue is a sloping yard and clay foundation which I think with constant rain made the pavers move a little, somehow i had it right then I just didn't.
I've since dug a big hole to put a peir in, I have the big pier and I drove 3/4" re-bar into all 4 corners radiating out at 45-60 dergee angle to stabilise the clay a little around 1200mm depth, crossing in the middle (thereabouts). I've had it dug for ages but constant rain and not prepared to get the aggregate in to leave in a sloping driveway and have all of the sand wash out. I'll get to it one day, it would be nice.


Throw in we get our clearest skies in winter and it drops below -10 locally. I was out last Monday in -5 and froze. I must find some gloves.
Your results are still amazing Dennis, even more so for a pack away every night set up.
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