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Paul, it’s an object discovered in WISE data. It is an elliptical ring, visible faintly in W1, but mainly in W2.
The team have taken a J band image from the Palomar 200-inch telescope, but could only get a faint detection of the nebula that overlaps the star inside the ring. They weren’t been able to detect the ring itself. While the ring is only detected in the infrared so far, the inner nebula does have an HSC (an instrument on the Subaru telescope) r-band detection from an archival PI large area survey, so we know that there is some visible light stuff going on too. R band on subaru coincides with the 656nm Halpha line, so we think that’s the best shot at getting a detection from the ground. While we don’t see a sign of a white dwarf at the centre of the ring, it is theoretically possible that this is some sort of strange planetary nebula or supernova remnant.
The coordinates of the approx centre of the ring are 04:27:05.688 +34:15:00.00Peter
Max, I’m involved in a Citizen Science Project called Backyard Worlds: Planet 9. See https://www.zooniverse.org/projects/marckuchner/backyard-worlds-planet-9/about/team
They’ve asked me to capture as much data on an object that they are researching.
There is some urgency as the object will soon be too low to capture until next winter.
Specifically they need enough data to put together a case for time on the HST (HST cycle 32 is now open for proposals).
Time on iTelescope would be invaluable in helping them put together the case.Peter
Yes I have had twin 6″ APM LZOS refractors for some years and wouldn’t swap them for any other refractor.
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I manage to image at up to 100% humidity. I have a dew shield and dew heater strap around the refractor glass. I find that I get the same misting of the glass as you show if I turn the heater on just as I start imaging – and it can take an hour or so to clear. So I turn the heater on well before I start – at least an hour beforehand.
Clouds prevented me from capturing this from London, but there were clear skies in Spain so I managed to capture it from there at 09:18 CET this morning. The image was produced using a short exposure (1/100th second) and a red filter. I did some test imaging this morning of both the moon and venus. Both red and Ha filters worked fine, although I felt that the Ha was more successful – don’t ask me why! The key thing is that the moon requires one tenth of the shutter speed of that venus needs. So the choice is an over-exposed venus or very faint moon. In my case the moon was best at around 0.3s with the Ha filter, and Venus at 0.03s. I’m tempted to try with both exposures on Friday, and then combine the images.
Yes of course I will. I have used Ha filters on the moon in daylight, but as David Arditti suggests a red filter might also be an option. If I get organised I will try different flters on both the moon and venus separately before they get to conjunction, and then capture the conjunction with whatever seems to work best.
I will try and attempt this, weather permitting of course. Will experiment on the moon beforehand to see how well it comes out with different filters.
