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INDI Library v1.8.5 Released (19 Apr 2020)

April 2020 release of INDI Library v1.8.5 introduces new drivers while providing fixes and improvements to existing devices and core framework.

Re:How to shoot comets?

2 months 5 days ago 2 months 5 days ago by maxthebuilder.
maxthebuilder
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Re:How to shoot comets? #51504
How to shoot/track comets properly with kstars/ekos?
How to process afterwards? I use DSS or APP.
Any advise?
Thanks!

Max S.
RPI 3 B+ with ABerry and RPI 4 B (4Gb) with SMate.
Nikon D5500 H-a modified. 180 mm f/2.8 antique Nikon. Tamron AF 28-75mm f/2.8. Rokinon 135mm f/2.
AT72EDII.
ZWO ASI294MC Pro
ZWO ASI120MC-S on ZWO 30F4 MiniScope.
SW AZ-GTi.
SW HEQ5.
iOptron SkyTracker Pro.

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2 months 4 days ago
TallFurryMan
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Re:How to shoot comets? #51505
Exposure duration depends on your guider, and the speed of the comet. For comet Atlas C/2019 Y4, the speed is about 1 arcmin per minute, probably more, so check how many pixels that result in if you guide on stars. Guiding on comet directly is supported by phd2, but it's tricky and manual.

If you decide you can capture with star-based guiding, you can use the scheduler to add capture jobs. Run enough captures so that the comet doesn't evade your field of view, then duplicate the observation jobs so that Ekos recenters the comet periodically.

Oh and don't forget to update comet orbital information in kstars before that.

Processing in DSS is fairly easy, as DSS can locate the comet core in each frame and stack accordingly.

-Eric

HEQ5-Pro - Atik 314E - Orion ED80T - DMK21 on Orion 50mm
DIY 3D-printed Moonlite and FWheel RGB/LPR
KStars and indiserver on two Atom 1.6GHz 1GB RAM Linux, VPN remote access

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2 months 4 days ago
PDB
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Re:How to shoot comets? #51507
"Guiding on comet directly is supported by phd2, but it's tricky and manual"

from CdC you can send the comet guiding parameters directly to Phd2

Paul

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2 months 4 days ago 2 months 4 days ago by maxthebuilder.
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Re:How to shoot comets? #51523
Thanks!
Will try tonight using your suggestions.

Max S.
RPI 3 B+ with ABerry and RPI 4 B (4Gb) with SMate.
Nikon D5500 H-a modified. 180 mm f/2.8 antique Nikon. Tamron AF 28-75mm f/2.8. Rokinon 135mm f/2.
AT72EDII.
ZWO ASI294MC Pro
ZWO ASI120MC-S on ZWO 30F4 MiniScope.
SW AZ-GTi.
SW HEQ5.
iOptron SkyTracker Pro.

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2 months 4 days ago
maxthebuilder
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Re:How to shoot comets? #51530
Oh... I was completely unaware of the "Edit Comet Mode" in DSS. Now I am.
That's something I was missing (I was wrongly assuming that DSS would auto-detect a comet)

Max S.
RPI 3 B+ with ABerry and RPI 4 B (4Gb) with SMate.
Nikon D5500 H-a modified. 180 mm f/2.8 antique Nikon. Tamron AF 28-75mm f/2.8. Rokinon 135mm f/2.
AT72EDII.
ZWO ASI294MC Pro
ZWO ASI120MC-S on ZWO 30F4 MiniScope.
SW AZ-GTi.
SW HEQ5.
iOptron SkyTracker Pro.

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2 months 4 days ago 2 months 4 days ago by Aurneth.
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Re:How to shoot comets? #51534
If you had a big enough guidescope, could you guide directly on the comet with KStars?

The processing program Siril can also deal with stacking frames containing a comet, though it helps to already be familiar with Siril as it has a bit of a learning curve (helps if you can read French, too).

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2 months 4 days ago
maxthebuilder
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Re:How to shoot comets? #51538
I don't even see the comet on my guide camera...
Well. Shooting it right now. C/2019 Y4 ATLAS.
AT72ED with ATI294MC. 120 sec exposure, Gain 200. Guiding on stars. Internal guider.
The comet looks pretty small with my setup.

Max S.
RPI 3 B+ with ABerry and RPI 4 B (4Gb) with SMate.
Nikon D5500 H-a modified. 180 mm f/2.8 antique Nikon. Tamron AF 28-75mm f/2.8. Rokinon 135mm f/2.
AT72EDII.
ZWO ASI294MC Pro
ZWO ASI120MC-S on ZWO 30F4 MiniScope.
SW AZ-GTi.
SW HEQ5.
iOptron SkyTracker Pro.

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2 months 4 days ago
TallFurryMan
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Re:How to shoot comets? #51539

PDB wrote: from CdC you can send the comet guiding parameters directly to Phd2


Agreed. KStars/Ekos doesn't have that feature. However, once the rates are sent, it still requires the mount to have good polar alignment and low periodic error. So that makes use of tricky prerequisites.

PHD2 also has a "comet training mode", which requires those guiding parameters, and around ten minutes of manual guiding to refine those for your own setup.

Note that none of this is "guiding on the comet" unfortunately. That's already quite cool!

-Eric

HEQ5-Pro - Atik 314E - Orion ED80T - DMK21 on Orion 50mm
DIY 3D-printed Moonlite and FWheel RGB/LPR
KStars and indiserver on two Atom 1.6GHz 1GB RAM Linux, VPN remote access

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2 months 4 days ago
TallFurryMan
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Re:How to shoot comets? #51540

maxthebuilder wrote: The comet looks pretty small with my setup.


You're supposed to look for the coma :) it is expected to be around 12-15 arcmin currently, which your telescope can certainly handle. Leave the core for higher focal lengths.

-Eric

HEQ5-Pro - Atik 314E - Orion ED80T - DMK21 on Orion 50mm
DIY 3D-printed Moonlite and FWheel RGB/LPR
KStars and indiserver on two Atom 1.6GHz 1GB RAM Linux, VPN remote access

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2 months 4 days ago
maxthebuilder
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Re:How to shoot comets? #51542
It's certainly visible. I am on the 40th frame right now..
The comet is close to a bright street light unfortunately. Getting terrible flares. I have limited viewing angles in my front yard : (

TallFurryMan wrote:

maxthebuilder wrote: The comet looks pretty small with my setup.


You're supposed to look for the coma :) it is expected to be around 12-15 arcmin currently, which your telescope can certainly handle. Leave the core for higher focal lengths.

-Eric


Max S.
RPI 3 B+ with ABerry and RPI 4 B (4Gb) with SMate.
Nikon D5500 H-a modified. 180 mm f/2.8 antique Nikon. Tamron AF 28-75mm f/2.8. Rokinon 135mm f/2.
AT72EDII.
ZWO ASI294MC Pro
ZWO ASI120MC-S on ZWO 30F4 MiniScope.
SW AZ-GTi.
SW HEQ5.
iOptron SkyTracker Pro.

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2 months 4 days ago 2 months 4 days ago by maxthebuilder.
maxthebuilder
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Re:How to shoot comets? #51543
Is there any other software other than DSS and Siri to stack comet sequences? PI, I guess... (but I am not getting there).
I am still to try Siril.
DSS sort of works.
In 'comet only" mode it produces some strange artifacts.
In "comet and stars" mode the result looks better at first look but the background looks weird and the color is missing...
Maybe all this is just because my dataset is not very good.

Max S.
RPI 3 B+ with ABerry and RPI 4 B (4Gb) with SMate.
Nikon D5500 H-a modified. 180 mm f/2.8 antique Nikon. Tamron AF 28-75mm f/2.8. Rokinon 135mm f/2.
AT72EDII.
ZWO ASI294MC Pro
ZWO ASI120MC-S on ZWO 30F4 MiniScope.
SW AZ-GTi.
SW HEQ5.
iOptron SkyTracker Pro.

Please Log in or Create an account to join the conversation.

2 months 2 days ago
TallFurryMan
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Re:How to shoot comets? #51599
Keep trying, it should work. My version of DSS can't handle the mode putting both comet and stars stacked, but the two others are working for me.

PI is not easy at all with comets (my own experience). However, you can batch-process your subs for noise and contrast and create a time-lapse, which is equally cool.

-Eric

HEQ5-Pro - Atik 314E - Orion ED80T - DMK21 on Orion 50mm
DIY 3D-printed Moonlite and FWheel RGB/LPR
KStars and indiserver on two Atom 1.6GHz 1GB RAM Linux, VPN remote access

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