The Propeller Nebula
New label example
Common Non-Stellar label example
The non-stellar object known as the "Propeller Nebula" has been added to the
Common Non-Stellar SDB file for plotting, searching, and labeling in TheSky6.
Look for it in future releases (version 6.0.0.53 and later).
Initially,
I found a rough set of coordinates for the object on the web. Then, using the Palomar Sky Survey, I created a digital image for the
approximate location then added an Auxiliary Object the approximate (subjective) center of the nebula. This becomes the label "Propeller Nebula".
All databases present in TheSky6 and on-line astronomical database searches
failed to locate the coordinates of this object. (Searching for the object DWB
111 found no matches either.
Following is the image created in
TheSky6 using the 102 CD version of the Palomar Sky Survey.
By adding an auxiliary object at
the "Cursor Position" which is right at the center of the nebula the label
appears. The coordinates from the "Cursor Position" are then added to the SDB
file with the object's name.
Next, following is the new object
entry based on the above image. The fields in order are "0" plot control (see
below), Right Ascension, Declination (Epoch 2000), object name, and the
ALIAS or Cross Reference field.
The leading "0" in the first column determines whether or not the object plots
at all zoom levels or only when zoomed in less than 50 degrees. 0 = only plot at
less than 50 degrees a 1 = plot at all zoom levels.
The word "NONE" in the last field is found in
the ALIAS field.
Since there is no objects to cross reference, I choose NONE. This object
is not an NGC, IC, or found in other standard astronomical catalogs.
0 20.26954722 43.68038889 Propeller Nebula
NONE
And now the new entry placed in
alphabetical order in the Common Non-Stellar text file.
Just make sure that the new entry
is line with the others. All spacing must be the same.
.............snip
0 8.66641584
19.64893350 Praesepe
NGC2632
0 20.26954722 43.68038889 Propeller Nebula
NONE
1 17.89633333 -34.78333333 Ptolemy's Cluster
NGC6475
............snip
After adding your new object to
the text file "Propeller Nebula", click Data | Import and then
click Browse to locate the text file
by name. Finally, click Compile. The Common Non-Stellar text file is found in the
..\TheSky6\Data\Auxiliary Files folder as highlighted on the Import dialog
below.
Data | Import
Find Common Non Stellar.txt and Compile
Warning!
When you compile the text file (after
adding the new entry) you will be asked if you want to "Add to Auto Load
Database List" as highlighted below. Choose "No" as shown below.
Do not add the database
a second time or you will end up with
two labels for all these objects!
Click No when prompted.
Do not add again
Once the data has been compiled
you can now search for the Propeller Nebula. Click Edit | Find and enter
Propeller
Nebula. It is also listed under the Common Names group as well. Here is the Find
dialog showing this.
Edit | Find Propeller Nebula
Now just enter the object!
If you do not see the Propeller
Nebula listed go back and double check the entry in the Common Non-Stellar Text
and re-compile after making any changes!
If there are two labels for all
the non-stellar objects, don't panic.
Just remove the repeated SDB. Here is how.
Click Data | Sky Database Manager and remove
the second Common Non-Stellar.SDB from the list.
Highlight Common Non-Stellar
SDB here and then click Remove.
Remove this since the SDB is already loaded
automatically by default!
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