[AZ-Observing] Re: FW: C/2015 ER61 (PanSTARRS) -- Got Him this morning !!
- From: Brian Skiff <bas@xxxxxxxxxx>
- To: az-observing@xxxxxxxxxxxxx
- Date: Sun, 09 Apr 2017 09:46:36 -0700
On Sun, 2017-04-09 at 08:14 -0700, David Douglass wrote:
Last Friday evening at the SAC meeting, I showed images of a comet which I
had just recently captured.
Both a single “observation sheet”, and an animation of 15 frames of 2-minutes
each (1 second per frame).
That was C/2017/E4 (Lovejoy).
This morning, I went after another one…. C/2015 ER61 (PanSTARRS).
Imaged this morning 04:30 AM through 05:00 AM
Starting Elevation was 17 Degrees… (YUK !!)
These are nice frames and animations. Getting comets
down in the dirt is the usual thing, so get used to it!
(They're brightest when they're close to the Sun, of course.)
If my arithmetic is right, you're getting about 0".5/pixel
with your telescope + camera set-up. For extended objects
like this you might try binning the CCD 3x3 to get roughly
1".5 pixels (if the camera-control allows on-chip binning).
This would greatly increase you efficiency and also mask
some of the tracking errors in these images.
This post highlights that fact that at present we have
three "pretty bright" comets available through the night.
Despite the bright Moon, Comet 41P Tuttle-Giacobini-Kresak
is a mag 6 object up in the evening well north (away
from the Moon), and in just about an optimal viewing location.
The other two mentioned above are up only at dawn, in fact
rather deep in the morning twilight. There is also
C/2015V2 Johnson down at mag 8, but also well north and visible
from late evening hours until dawn.
A good place to keep up with what comets are available
is Seiichi Yoshida's pages here:
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