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PostPosted: Sun, 22-11-15, 10:27 GMT 
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Saw this one got into some of the science pages, e.g. here.

Paper in question is Frew, Parker and Bojičić (2015) "The Hα surface brightness–radius relation: a robust statistical distance indicator for planetary nebulae"

Maybe of interest for Celestia.Sci? (Though I guess it would need to be combined with other sources to get shape/size/orientation data)


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PostPosted: Sun, 22-11-15, 10:58 GMT 
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ajtribick wrote:
Saw this one got into some of the science pages, e.g. here.

Paper in question is Frew, Parker and Bojičić (2015) "The Hα surface brightness–radius relation: a robust statistical distance indicator for planetary nebulae"

Maybe of interest for Celestia.Sci? (Though I guess it would need to be combined with other sources to get shape/size/orientation data)


Andrew,

many thanks for the paper! It will be useful indeed. So far for good reasons, PN's are among the most neglected deepsky objects in celestia.Sci (and in Celestia as well, of course). The found correlation between PN distance and their H_alpha surface brightness looks simple and convincing to me.

Another problem with the 3D rendering of nebulae in general is the generic lack of symmetry in their shapes. Hence automatical rendering by computer remains a big challenge...

Fridger

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PostPosted: Tue, 01-12-15, 21:09 GMT 
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I'd collected several Simbad PN catalogs, filtered-out duplicates within a spreadsheet and set up the parameters Celestia require; now that I've got the two A3-A4 1k planetary nebulae distances (the "supporting information" of the above paper) I will continue on the subject. Then I will send to you the spreadsheet for check/revision. I think that at this point the basic concern is HOW TO NAME the PNs, some having up to 20 different names/designations. :shock:

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PostPosted: Sun, 06-12-15, 19:31 GMT 
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Added RA-DEC ICRS/J2000 to the PN A4 table. RA-DEC have been got by sending/returning a .txt file with the PN identifier to Simbad. kpc have neen converted also in ly and the uncertaintly is moved within its proper column. The last three columns have the data Celestia require. Up to 50 PNs are returned with unidentified catalog, therefore no RA-DEC for these (##.#### is shown). Note that about 70% of the A4 PN table are southern PNs.

Attachment:
Nebule_A4.zip [285.91 KiB]
Downloaded 45 times

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PostPosted: Mon, 07-12-15, 0:01 GMT 
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For 1084 of 1133 PNs .DSC Celestia's preview:

Attachment:
planetary_nebule.zip [25.89 KiB]
Downloaded 44 times

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PostPosted: Tue, 08-12-15, 16:18 GMT 
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ERRATA CORRIGE:
There is a (my) typo for PN Abell 18 (row 617) it should be:
MEAN DISTANCE kpc = 2.64;
MEAN DISTANCE ly = 8610.528
MEAN NEBULA RADIUS = 1.669

below the corrected .DSC
Attachment:
planetary_nebule.zip [25.89 KiB]
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PostPosted: Fri, 11-12-15, 16:34 GMT 
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ERRATA CORRIGE 2 (debug info)

Within the .DSC, the identifier of the PN NGC 650/1 (the Little Dumbbell Nebula) should be changed as:
Code:
Nebula "NGC 650-1"
or the nebula will not be selected by Celestia (albeit shown in console).

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