February 11, 2019 at 2:43 pm #4431
DaveM beat all of us in his report on the newly observed C/2018 Y1 (Iwamoto). Great report Dave! Saturday night myself, JoshW (25″ f/4), BobJ (with his 20″ f/5 Obsession), Igor ( imaging something neat I’m sure, didn’t ask him) and ElanL and some newbies (sent to Frank’s BMVO by TedM from SkiesUnlimited) all observed the comet with binoculars and telescopically.
Using the updated RA/Dec from SkySafari Pro and entering that into the ArgoNavis (under Setup Scratch) I easily located C/2018 Iwamoto with Sol Invictus. Using the 21 Ethos (TFOV 0.91°, 110x) the coma of Iwamoto easily filled most of the observable eyepiece FOV. I’d estimate without using any filter the apparent angular size of the coma was at least 1/2 degree, HUGE, as big as the Full Moon. There was a bright central condensation. No tail ( ion or dust) was noted. I added the Lumicon® “Comet Filter”, essentially optimized BandPass for ionized 1λ2,2λ2-ethene (C2) and also isolates the 501nm OIII line as well as both C2 lines at 511nm and 514nm, and the Coma grew larger!
I was easily able to “sweep” it up with my Canon 10x42IS binos; we all debated whether we were able to also see it visually but the nearby bright star Chi Leonis (63 Leo) at +4.6 mag had us fooled!
This puppy is mov’n fast!
Today it’s in the “body” of Leo between 46 and 37 Leo.
BTW when Josh and I left the field at 6:00 AM it was 14ºF!
GastronautFebruary 11, 2019 at 4:48 pm #4434
Comet Iwamoto has already brightened to sixth magnitude.
DaveFebruary 11, 2019 at 5:12 pm #4435
Comet C/2018 Y1 (Iwamoto) will pass just 3.5 arc minutes south of the tenth-magnitude galaxy NGC 2903 at approximately 21:20 UT (4:20 p.m. EST) on February 13th.
Finder charts can be found at https://cometchasing.skyhound.com/comets/2018_Y1.pdf and https://s22380.pcdn.co/wp-content/uploads/Iwamoto-chart-updated-V2.jpg
Comet Iwamoto was the subject of the February 9th APOD.February 11, 2019 at 8:17 pm #4436
THAT’S WHAT I’M TALKIN’ ABOUT!!!! Thanks for the reports folks. I’m sorry I couldn’t be there. Tony woulda loved it, too.February 11, 2019 at 11:23 pm #4437
Here is a snapshot of the comet taken between 11:54 and 11:57 pm on February 09, 2019 at BMVO. This is a stack of 7 x 30 sec frames taken through 8″ reflector with ASO1600 camera. North is up. Field of view is ~ 48 arc-min by 66 arc-min. A great number of faint background galaxies can also be found in the image including the galaxy cluster ACO 1159 below the comet. The image can also be viewed in my Google album at: https://goo.gl/photos/wcHSUXdu8UYy8E159February 12, 2019 at 10:26 am #4440
Nice one! Thanks for posting.
FrankFebruary 12, 2019 at 12:34 pm #4441
Best photo I’ve seen yet of C/2018 Y1, Igor. Beautiful, especially with ACO 1159 in the frame.February 12, 2019 at 12:44 pm #4442
That is a wonderful shot, Igor!
Bob Jorgenson, did you or your wife take any pictures? If so, I’d like to see them.
Here’s a few that I took with my Ioptron skytracker.
Photo 1: f/1.8 || 50mm || ISO 800 || 23 secondsFebruary 12, 2019 at 12:45 pm #4444February 12, 2019 at 12:45 pm #4446
Photo 3: f/1.8 || 50mm || ISO 1600 || 34 secondsFebruary 12, 2019 at 7:54 pm #4456
No photos here. Too cold for Erin. I saw the comet in my binoculars. I didn’t confirm seeing it in my 20″ Obsession. However I am now positive I did see it. In reviewing Igor’s image and Doc’s report, it is evident to me that I had the comet in sight. I just used too much power. The center core is almost stellar with a very diffuse coma surrounding it. At higher powers you miss the coma.
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