Fox Fur and Cone Nebula
Fox Fur and Cone Nebula
I have ready for upload the texture and 3ds model for NGC 2264 (Fox Fur Nebula and Cone Nebula), but I'm missing a dsc file with info about it. Where can I found info on this?
A Google search for "NGC 2264" the best way to start. SEDS has its coordinates to the nearest minute of arc.
I usually use either VirtualSky or SkyView to create a wideangle (0.5 degree) snapshot of the sky around the object, align that snapshot with Celestia's stars, and then align the model with the snapshot. See my billboard page for details.
Remember, the coordinates for your model will not be the same as the accepted coordinates for the astronomical object. The shape of your 3DS model is different.
I usually use either VirtualSky or SkyView to create a wideangle (0.5 degree) snapshot of the sky around the object, align that snapshot with Celestia's stars, and then align the model with the snapshot. See my billboard page for details.
Remember, the coordinates for your model will not be the same as the accepted coordinates for the astronomical object. The shape of your 3DS model is different.
Selden
I found this site http://simbad.u-strasbg.fr/sim-id.pl?protocol=html&Ident=NGC+2264&NbIdent=1&Radius=10&Radius.unit=arcmin&CooFrame=FK5&CooEpoch=2000&CooEqui=2000&output.max=all&o.catall=on&output.mesdisp=N&Bibyear1=1983&Bibyear2=2004&Frame1=FK5&Frame2=FK4&Frame3=G. But I ment how can I convert this data to work with Celestia, like this for example:
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Distance 8500
RA 10.7345
Dec -59.752
Radius 219
Simbad says
that means
RA = 06 H 41.1 Min
Dec = 9 Degrees 53 Min
You then have to convert the fractional minutes into hours (and degrees) and add them:
RA = 6.0 + (41.1/60.0) = 6.685
Dec = 9.0 + (53.0/60.0) = 9.883
The distance you have to get from other sources. You'll find lots of different values because the different methods of determining the distance have "large error bars". That means that they're really hard to measure with any reliability. For star clusters like NGC 2264, I usually use the value mentioned in
WebDA
It claims that NGC 2264 is about 667 parsecs (x2.63 = 1755 LY) away. That's close enough that some of its members probably were measured by Hipparcos.
Yup: WebDA lists HIP 31939, HIP 31955, HIP 31978, HIP 32030 and HIP 32053 as cluster members. According to Celestia, most of them are at a distance of about 1000-1200 LY. This suggests that traditional spectroscopic methods of estimating the distances of the cluster's members may have been overestimating the distance to the cluster. (This often is the case for stars within a nebula. The "interstallar reddening" effect due to dust is very hard to measure, especially since it varies from one star to another within a complex nebular structure.)
Since the stars seem to be burning away the nebula, this suggests that the distance to the nebulas is about the same as the distance to the stars in the cluster. Since the nebula is glowing red due to the starlight coming through it toward us, its front is slightly closer.
Does this help?
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ICRS 2000.0 coordinates
06 41.1 +09 53 D ~ that means
RA = 06 H 41.1 Min
Dec = 9 Degrees 53 Min
You then have to convert the fractional minutes into hours (and degrees) and add them:
RA = 6.0 + (41.1/60.0) = 6.685
Dec = 9.0 + (53.0/60.0) = 9.883
The distance you have to get from other sources. You'll find lots of different values because the different methods of determining the distance have "large error bars". That means that they're really hard to measure with any reliability. For star clusters like NGC 2264, I usually use the value mentioned in
WebDA
It claims that NGC 2264 is about 667 parsecs (x2.63 = 1755 LY) away. That's close enough that some of its members probably were measured by Hipparcos.
Yup: WebDA lists HIP 31939, HIP 31955, HIP 31978, HIP 32030 and HIP 32053 as cluster members. According to Celestia, most of them are at a distance of about 1000-1200 LY. This suggests that traditional spectroscopic methods of estimating the distances of the cluster's members may have been overestimating the distance to the cluster. (This often is the case for stars within a nebula. The "interstallar reddening" effect due to dust is very hard to measure, especially since it varies from one star to another within a complex nebular structure.)
Since the stars seem to be burning away the nebula, this suggests that the distance to the nebulas is about the same as the distance to the stars in the cluster. Since the nebula is glowing red due to the starlight coming through it toward us, its front is slightly closer.
Does this help?
Selden
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Brendan
- Posts: 296
- Joined: 15.07.2003
- With us: 21 years 4 months
- Location: Bellows Falls, VT
- Contact:
I could not get the Cone nebula unzipped. It doesn't work when trying to extract the jpg file. Winzip shows:
All of the above files except for the jpg file got extracted. I have downloaded both parts of the zip file a few times but I still get the error.
Brendan
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Extracting to "C:\Program Files\Celestia\nebulae\"
Use Path: yes Overlay Files: no
Extracting install.txt
Extracting Cone.3ds
Extracting NGC 2264.dsc
Extracting NGC2264.jpg
Error: invalid compressed data to inflate
All of the above files except for the jpg file got extracted. I have downloaded both parts of the zip file a few times but I still get the error.
Brendan
