Ah. Thanks for the astrometry.net mention. Not being an astrophotographer I was unfamiliar with it, but searched there for NGC 1711 etc and these two (and more) images did come up.
By the way - for months now we've rarely had more than a few minutes between clouds to glimpse anything, and most nights it's nothing but cloud and rain. Not even the moon gets through. The butterflies on the other hand are going gangbusters in my garden.
Oops - edit to add:
Quote:
Originally Posted by Bassnut
What catalog is "N" ?
Now I look again, I see we found the same page, and I have exactly the same question.
The object does show up in a SIMBAD search of your co-ordinates (attached)
When I did the search however, it returned 900 objects in a 1/4 degree
space.
As to which one it was....I have no idea.
Peter. as found now, it has a name, difficult to find though not surprised you didnt casually find it, was random on my part.
Quote:
Originally Posted by AdamJL
Good detective skills there, Batman
Was obvious in hindsight, but without the other post in astrometry.com post I would have no idea. Whatever the N catalog its not in mainstream apps it seems. I also have The Sky, but its such an unintuitive difficult exercise adding catalogs I gave up years ago.
Quote:
Originally Posted by Finbar
Ah. Thanks for the astrometry.net mention. Not being an astrophotographer I was unfamiliar with it, but searched there for NGC 1711 etc and these two (and more) images did come up.
By the way - for months now we've rarely had more than a few minutes between clouds to glimpse anything, and most nights it's nothing but cloud and rain. Not even the moon gets through. The butterflies on the other hand are going gangbusters in my garden.
Oops - edit to add:
Now I look again, I see we found the same page, and I have exactly the same question.
Yes, you found that exactly the same time I did, sorry for you miss so much work. Im retired, my time is suddenly valuless
Fred,
Excellent capture and processed image
Well done for effort and tenacity alone !!
It’s definitely on Stellarium when you zoom in but not identified
You’ll have to send the guys at Stellarium a note and get them to update details
There are a few errors in Stellarium one of which is the Gabriela Mistral nebula NGC 3324 which they call The Keyhole Nebula which is incorrect. The Keyholecis located adjacent to the star Eta Carinae.
Fred,
Excellent capture and processed image
Well done for effort and tenacity alone !!
It’s definitely on Stellarium when you zoom in but not identified
You’ll have to send the guys at Stellarium a note and get them to update details
There are a few errors in Stellarium one of which is the Gabriela Mistral nebula NGC 3324 which they call The Keyhole Nebula which is incorrect. The Keyholecis located adjacent to the star Eta Carinae.
Cheers
Martin
Thanks Martin.
You being a Startools fanboy like me, I gotta tell you Startools aint real flash with its (albiet powerfull) autodev function on very dim images, I've found it troublesome several times. I can get round it with 3 manual iterations of filmdev, so its not a deal breaker, but I wish Startools had a selection of alternative auto stretch algorithms.
Startools isn’t bullet proof , all processing software has its limitations. The object you imaged is a rare animal indeed , even unidentified on some charts.
Maybe post your image on the ST forum with your difficulties and I reckon Ivo or Mike will reply
Glad you found a workaround
Again top notch image
Martin
Sorry for the confusion guys. What catalog is "N" ?
An article titled "Optical Spectra of Supernova remnants" by Danziger and Dennefeld (1976) (Can be downloaded here) makes reference to N185 but fails to give a reference to the catalog.
Given that article Chatgpt was able to provide the following
Quote:
Object N185 is a region of ionized hydrogen gas located in the Large Magellanic Cloud (LMC), a satellite galaxy of the Milky Way. It is also known as LHA 120-N 185 or DEM L 106.
The region is characterized by its strong emission in the hydrogen-alpha spectral line, indicating the presence of ionized hydrogen gas excited by nearby hot stars. Object N185 is a type of emission nebula, also known as an HII region, and it is believed to be a site of ongoing star formation.
The region was first cataloged by the Hubble Space Telescope in the mid-1970s, and subsequent studies have used it as a benchmark for understanding the properties of HII regions in other galaxies. The article referenced in your question, published in the Publications of the Astronomical Society of the Pacific in 1976, may have been one of the early studies of Object N185.
Overall, Object N185 is a fascinating astronomical object that provides insight into the ongoing process of star formation and the properties of ionized gas in the universe.
ChatGPT also provided the following on LHA 120-N
Quote:
LHA 120-N is a catalog of HII regions (regions of ionized hydrogen gas) in the Large Magellanic Cloud (LMC), a satellite galaxy of the Milky Way. It is part of the "List of HII Regions in the Large Magellanic Cloud" catalog, which was compiled by astronomers at the European Southern Observatory (ESO) in the 1980s.
The LHA catalog provides a systematic way of identifying and studying HII regions in the LMC, which is an important target for astronomers due to its proximity and relatively low levels of dust extinction compared to the Milky Way. Each HII region in the catalog is assigned a unique identifier, such as LHA 120-N, which indicates its location within the LMC.
In the case of LHA 120-N, the "120" indicates its position in the LHA catalog, while the "N" indicates that it is located in the northern half of the LMC. The "LHA" prefix stands for "List of HII Regions in the Large Magellanic Cloud."
ChatGPT can't be relied upon for correct information so this would need to be verified with an authoritative sources before taking it to be gospel.
For LHA 120-N 185
LHA 120 N = Lamont-Hussey alpha, field 120: LMC, Nebula
from K.G. Henize, "Catalogues of H-alpha emission stars and nebulae in the Magellanic Clouds" (1956)
For DEM L 25
DEM = Davies, Elliot, and Meaburn, "The nebular complexes of the Large and Small Magellanic Clouds" (1976)
L = LMC
The numbers are the position of the object in their lists.
Thanks all; this has been an interesting learning experience.
And this time I really mean it, night, night.
Barry
For Stellarium users - just found its easy method for identifying an object via SIMBAD.
1) Add a custom marker at point of interest [Shift + left click]
- markers are temporary, and cannot be saved.
2) With marker selected, open find [Ctrl + F]
- the window opens in the SIMBAD tab; change parameters if desired.
3) Click "Query SIMBAD about selected object"
- a few seconds later basic info appeared with the identifiers.
This will be handy for the future (if I remember how). More control is available searching directly at SIMBAD by entering the coordinates, as Peter did.
For Stellarium users - just found its easy method for identifying an object via SIMBAD.
1) Add a custom marker at point of interest [Shift + left click]
- markers are temporary, and cannot be saved.
2) With marker selected, open find [Ctrl + F]
- the window opens in the SIMBAD tab; change parameters if desired.
3) Click "Query SIMBAD about selected object"
- a few seconds later basic info appeared with the identifiers.
This will be handy for the future (if I remember how). More control is available searching directly at SIMBAD by entering the coordinates, as Peter did.
Barry
wow youve done a ton of investigation there Bary, thanks m.
Theres far more info than I had found, an excellent read and ive looked at all the links you gave.
Also, excellent use of GPTchat Erick, im amazed how it performs!.
Quote:
Originally Posted by AdamJL
The more I look at this, the more I want to know what the tiny blue and red/purple nebula on the right is
Want to give that one a go too, Fred?
I will give those areas a shot actually. The position now wont give me much time on them, but worth it I think.
Fred,
Just come across this clip from Dylan O’Donnell on a strange bubble
It’s the one I saw on Stellarium which was unidentified
Obviously not the same object as yours ??
You have have boldly gone where no-one has gone before!
To infinity and beyond
And retrieved priceless details
Amazing
Thanks Paul.well, Don Goldman did . He often takes odd subjects and ive often in the past looked at his site for inspiration. Not this one though.
Quote:
Originally Posted by Startrek
Fred,
Just come across this clip from Dylan O’Donnell on a strange bubble
It’s the one I saw on Stellarium which was unidentified
Obviously not the same object as yours ??
I had a look. Its a pretty good video actually, one of his best, I like his explanations. That bubble is N70, i imaged it a few years ago, its a lot brighter and quite popular. Also interesting and easier to go deep and detailed on.
The link provided by Petra describes the difference between the 2, a good read.
The X-ray luminosity of N70 is higher than that expected
from a quiescent superbubble model; thus, the interior of N70
is most likely heated by a recent SN. The X-ray luminosity
of N185 is an order of magnitude lower than that expected
from a quiescent superbubble with the size and expansion
velocity of N185. The hot gas in N185 is most likely originating
from a SNR, as it shows nonthermal radio emission, fast and
irregular expansion, and its X-ray luminosity is consistent with
that of an evolved SNR. The large shell of N185 may be
associated with an earlier SN event. These explanations are
supported by the observed stellar population in these two large
shell nebulae.
.
