My version of NGC6905 + Nova Delphini
Posted 17 August 2013 - 12:10 PM
Posted 17 August 2013 - 05:31 PM
*Very* nice. Your drawing captures the quality of looking through the telescope with you.
Most people have reported the nova appearing either yellow/yellow-white or white/blue-white. Yours is the first report of a greenish color I've read.
Posted 18 August 2013 - 02:34 AM
With the moon light it's quite difficult to appreciate the color. Anyway during the first night of my observation : 16th, I will say White-blue White color but yesterday, 17th and this very morning, the color was maybe changing with some blue-green light. To be confirmed !!!
Posted 18 August 2013 - 04:56 AM
The nova seemed to have a very slight greenish hue and this wasn't due to the FOV border astigmatism, because I also noticed it when I put it at the centre. So was this my imagination, false colour from the eyepieces or can anyone confirm that it is real?
Very nice as ever Peter!
Funnily enough I thought the nova quite greenish too: I was observing same date/time as you with the 415mm D-K (x365 with binos). Then I found I had mis-pointed the scope and was actually looking at 29 Vul (spec A0)! The nova I found to be a creamy-white (matching F5 –F7 stars - more yellow with my 120mm refractor x25). Nevertheless from your fine rendition you seem to have indeed got the nova! Curiouser and curiouser!!
At first thinking the nova greenish I was not too surprised as they can go through quite a gamut of hues as they fade. One in Cassiopeia (or Cygnus?) I recall displaying the deepest blue I’ve seen in any star, and one in Vulpecula (60s/70s?) the most delightful intense mauve/magenta. I need to seek my records with these – going from memory).
Not been clear since but hopefully tonight I will check out 29 Vul and the nova. I plan to keep a record of the nova’s hues in coming weeks and maybe put a compilation of impressions here. Have we actually got a green single star (29 Vul) I don’t know. I’m not that disposed to seeing the greens as ascribed to some doubles – usually more blue. Similarly the often stated greenish hue of Beta Lib has always eluded me simply looking blue-white.
The moon was a mild nuisance that night but I do not think the hues were affected in the dark x365 field of the D-K to any degree.
Posted 18 August 2013 - 06:02 AM
I am aware that the ES eyepieces do suffer from yellowish false colour, especially by the FOV edge. So, blue and yellow make green... This is getting complicated...
Posted 18 August 2013 - 07:26 AM
Posted 18 August 2013 - 11:27 AM
Love the widefield sketch. Knowing what is going on while looking at a classic nova makes it exciting but of course the stealer of this beautiful sketch is the planetary NGC 6905.
Posted 18 August 2013 - 02:43 PM
Very nice version of NGC 6905 & the Nova in Delphini .
Posted 18 August 2013 - 04:12 PM
Posted 20 August 2013 - 04:54 AM
Posted 23 August 2013 - 04:04 PM
Posted 24 August 2013 - 12:57 PM
Posted 25 August 2013 - 03:59 AM
@Larry: NGC6905 is not a very well known object, also because it resides in such an obscure little constellation. But it is a real beauty and like you said you can easily push it to high Macs and it will reveal a lot of detail.
Posted 26 August 2013 - 10:47 PM
I'm always very very impressed by you night sketches. The representation of the stars is so real, exactly like looking throught your scope. Beautiful sketch my friend. You have a so great talent in sketching the stars.
Posted 27 August 2013 - 01:57 AM
Excellent work Peter!