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Thread: Comet 21 P Giacobini-Zinner, and OC Pismis-Moreno1 on the 19th July, 2018

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    Default Comet 21 P Giacobini-Zinner, and OC Pismis-Moreno1 on the 19th July, 2018



    Hello all,

    The fairly bright comet 21 P Giacobini-Zinner, moving now through Cepheus, has been a good reason to haul the 6” refractor on the terrace, even if the transparency of the skies has been by far not as good as yesterday.

    The comet 21 P Giacobini-Zinner has been easily found through the 17.3 mm TV Delos close to the expected position of Teu 53, about 2° north off Delta Cephei.
    The best view has been at the magnification of 214x through the Pentax XW 3.5mm,
    revealing a small core with a tail. The visual extension of the tail has been estimated as 15 arcminutes.

    The Pismis-Moreno1 open cluster has been for a long time on my observing list,
    but there are always some more important things to do, though.
    The cluster is framed by a wide pair of two stars. The best view has been through the 6mm BCO, revealing a loose group of 6 faint stars in this ‘exotic’ open cluster.

    Date and time: 19th July, 2018, 23:00 – 24:00 local summer time
    Observing conditions: Milky Way hardly visible
    Place: Backyard
    Telescope: 6” Synta (Sky-Watcher) F/5 achromatic refractor
    Eyepieces: Tele Vue 17.3mm Delos (magnification 43.3x, exit pupil 3.5mm),
    BCO 6mm (magnification 125x, exit pupil 1.2mm)
    Pentax XW 3.5mm (magnification 214x, exit pupil 0.7mm
    Side-by binoculars: 10.5x70 BA8

    Thanks for reading,

    JG
    Binoculars: Leica Ultravid 7x42, 8x42HD; Swarovski EL 8.5x42 Swarovision; Nikon 10x70 Astroluxe; Docter Nobilem 7x50 Porro; Jenoptem 7x50W, 10x50W; BA8: 10.5x70, 15x85; 25x100FB, AsahiPentax 8x40, Refractors: Sky-Watcher 150mm/750mm; Leica APO Televid 82mm (25x-50x WW ASPH); EPs:Baader Classic Orthos; Fujiyama ortho, Leica B WW, ultrawide zoom ASPH, Periplan GF, HC Plan S, L; DOCTER UWA; Wild UW mil; Tele Vue Delos, Nagler Zoom, Plössls; Swarovski SW; Pentax XW; ZEISS diascope B WW T*, Carl Zeiss E-Pl; Hensoldt mil; Filters: Astrodon, Astronomik, Baader (CCD), TS; Astrophotography: AstroTrac; Leica R7: Leica 2/50, 2/90mm, 2.8/180mm lenses
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    Default Re: Comet 21 P Giacobini-Zinner, and OC Pismis-Moreno1 on the 19th July, 2018

    Thank you JG for this fine, detailed report.
    I now have two more interesting targets to look forward to.
    Only 6 stars in Pismis? Or only 6 resolved?

    Thank you.
    Telescope: Mak; 127, Meade 8 LXD75, Fracs; ES127mmFcd100,ES80Essential, SW 100ED Evostar, Skychief 60mmF15. Mount: cg4, az/eq5, slt, lxd75, farpoint Para. EP: Doctor 12.5 UWA, Pentax 7-14XW, KK Ortho 4-25, Meade Plossl x3, TV 22Panoptic, Leitz 10X,12.5X, Leica 10X25 HC, Bits of other glass. Binoculars: 8x43 Pentax, 10X30 Swarovski, 25X100 Oberwerk.Cam;Nikon d90, Nikon d810.
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    Default Re: Comet 21 P Giacobini-Zinner, and OC Pismis-Moreno1 on the 19th July, 2018

    Hello Don,

    I have seen only 6 stars which I would count as the cluster members. This does not exclude, that some other stars far away, I have also seen, may belong also to the cluster.
    Here is more info: WEBDA: Open cluster page

    Clear skies,

    JG
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    Default Re: Comet 21 P Giacobini-Zinner, and OC Pismis-Moreno1 on the 19th July, 2018

    Great catch JG. I believe you had a better view than I did since I examined the comet at low power and did not ratchet up the magnification.

    One thing that I am noticing is that with the 152mm scope at low power the skyglow is a bit brighter than with the Z10 and the Obsession, softening the background. This makes it tougher to see distended objects (e.g., galaxies) at the lower magnifications. The problem is somewhat cured if I switch to a 9mm to 12mm eyepiece.

    Thanks for the fine report and glad that you could enjoy a session as the weather has not been very cooperative for you.
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    Michael
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    Default Re: Comet 21 P Giacobini-Zinner, and OC Pismis-Moreno1 on the 19th July, 2018

    Thank you JG.
    I have a wonderful book on this subject I shall pull from the shelf and study a bit.
    This one seems like it could be easily missed without some forknowledge.

    Best of skies to you!
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    "The pendulum of the mind oscillates between sense and nonsense"
    "Gratuitus affermations of a dominant theory can mesmerize the unwary."

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    Default Re: Comet 21 P Giacobini-Zinner, and OC Pismis-Moreno1 on the 19th July, 2018

    Congratulations on the comet JG!

    It would seem both hemispheres are currently enjoying the pleasure of comets.
    I hope to get out soon, we have clear skies, and do a follow up observation of the Southern comet C/2016 M1 (PANSTARRS).
    Thanks for the report.
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    Default Re: Comet 21 P Giacobini-Zinner, and OC Pismis-Moreno1 on the 19th July, 2018

    Quote Originally Posted by helicon64 View Post
    Great catch JG. I believe you had a better view than I did since I examined the comet at low power and did not ratchet up the magnification.

    One thing that I am noticing is that with the 152mm scope at low power the skyglow is a bit brighter than with the Z10 and the Obsession, softening the background. This makes it tougher to see distended objects (e.g., galaxies) at the lower magnifications. The problem is somewhat cured if I switch to a 9mm to 12mm eyepiece.

    Thanks for the fine report and glad that you could enjoy a session as the weather has not been very cooperative for you.
    Hello Michael,

    2 little improvements are needed on the cheap refractors.
    1. Oversized lens hood. I have made it from a black rough but lightweight doormat.
    2. 3" microbaffled focuser and a rough blackened 2" tube with a premium dielectric diagonal.
    I have cut 2 'baffles' from a black carton paper for the 2" tube, and put a filterwheel between the diagonal and the eyepiece tube. The 1.25" threaded holes in the filter wheel are the "baffles of the last resort".

    Herewith I get high contrast views I would have never dreamed of,

    JG
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    Default Re: Comet 21 P Giacobini-Zinner, and OC Pismis-Moreno1 on the 19th July, 2018

    Thanks Clinton!

    You have been blessed with some great comets in south, whereas we have been gazing at the clouds.
    Looking forward to your reports,

    JG
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    Default Re: Comet 21 P Giacobini-Zinner, and OC Pismis-Moreno1 on the 19th July, 2018

    Nice catches JG! I tried for the tail, but my sky was not good enough to push power above 100x.
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    Default Re: Comet 21 P Giacobini-Zinner, and OC Pismis-Moreno1 on the 19th July, 2018

    Well done JG. I noticed the WEBDA page for Pismis-Moreno 1 shows the cluster involved with the nebula Sh 2-140. Here is one sketch I found of the cluster.

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