Jump to content

  •  

CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.

Photo

Resolving protoplanetary disks in Orion

  • Please log in to reply
7 replies to this topic

#1 Lucullus

Lucullus

    Viking 1

  • -----
  • topic starter
  • Posts: 833
  • Joined: 14 Feb 2012

Posted 21 June 2020 - 06:09 AM

Leaving aside all kinds of seeing aspects, can amateurs detect protoplanetary disks, e.g. in the Orion nebula stellar nursery? What might be the maximal pixel scale to do so; would 0.5"/pixel suffice?



#2 pbealo

pbealo

    Apollo

  • *****
  • Posts: 1,052
  • Joined: 12 Oct 2006
  • Loc: New Hampshire

Posted 21 June 2020 - 10:25 AM

The problem isn't pixel size. It's seeing. What's your typical seeing? 2 or 3 Arc Sec??



#3 Lucullus

Lucullus

    Viking 1

  • -----
  • topic starter
  • Posts: 833
  • Joined: 14 Feb 2012

Posted 21 June 2020 - 05:14 PM

2-3 arcseconds. But that isn't the question, which is specifically without the influence of seeing.



#4 robin_astro

robin_astro

    Viking 1

  • -----
  • Posts: 948
  • Joined: 18 Dec 2005

Posted 24 June 2020 - 12:24 PM

 e.g. in the Orion nebula stellar nursery?  would 0.5"/pixel suffice?

Yes 



#5 gregj888

gregj888

    Vanguard

  • -----
  • Posts: 2,459
  • Joined: 26 Mar 2006
  • Loc: Oregon

Posted 24 June 2020 - 06:33 PM

You might be able to detect them but you won't resolve them,  Just a small darkened spot.

 

When the start talking about radio telescopes there is always a reason-

 

https://arxiv.org/pdf/1805.03669.pdf

 

If I did the math right, some of the bigger ones are about 1 arc-sec.  If you have 4x that resolution (0.25 arc sec) then you start to discern shape.  At 10x with star to see "stuff) (i.e. 0.1 arc sec),

 

Just my guess, I haven't tried it.  Be really tough with seeing.

 

Greg



#6 Lucullus

Lucullus

    Viking 1

  • -----
  • topic starter
  • Posts: 833
  • Joined: 14 Feb 2012

Posted 24 June 2020 - 07:58 PM

I wonder if it might be something for a 24inch or so telescope and a high QE CMOS with 20 to 30 fps and if several hundred of the sharpest subframes stacked would reveal a rough protoplanetary disk? Would be a cool experiment. Anyone with a good equipment having nothing better to do?

#7 robin_astro

robin_astro

    Viking 1

  • -----
  • Posts: 948
  • Joined: 18 Dec 2005

Posted 24 June 2020 - 08:43 PM

This one should be just about be resolvable as being elongated at 1 arcsec resolution (~1x4 pixels at 0.5 arcsec/pixel)

https://www.spacetel...mages/opo9545h/

 

Robin


  • gregj888 likes this

#8 gregj888

gregj888

    Vanguard

  • -----
  • Posts: 2,459
  • Joined: 26 Mar 2006
  • Loc: Oregon

Posted 25 June 2020 - 12:33 AM

Lucullus

 

You may want to download the Speckle Tool Box and try you data set with Bi-Spectrum.  You can combine it with Lucky as well.

 

https://groups.io/g/...einterferometry

 

Greg




CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.


Recent Topics






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics