[AZ-Observing] Re: The Crab Nebula - Enhanced Hydrogen Comparison

  • From: "Jimmy Ray" <jimmy_ray@xxxxxxx>
  • To: <az-observing@xxxxxxxxxxxxx>
  • Date: Thu, 22 Jan 2009 18:25:06 -0700

Not to focus too much on the Asteroid vs. the spectacular intended image but
when I zoom in I see three dark bands across the object which would lead me
to believe that those are the filter change on R,G,B and luminance with the
brightness change due to the asteroid itself possibly tumbling / rotating...

Jimmy Ray

-----Original Message-----
From: az-observing-bounce@xxxxxxxxxxxxx
[mailto:az-observing-bounce@xxxxxxxxxxxxx] On Behalf Of tpolakis@xxxxxxx
Sent: Thursday, January 22, 2009 2:33 PM
To: az-observing@xxxxxxxxxxxxx
Subject: [AZ-Observing] Re: The Crab Nebula - Enhanced Hydrogen Comparison

Original Message:
-----------------
From: Richard Harshaw rharshaw2@xxxxxxx

>I thought it might be a tumbling rocket booster. Notice the dashes in the
image.


Dick,

Since tumbling space junk would cross that frame in seconds, it seems like
it would extend off the edges of the frame, or at least fade gradually into
the earth's shadow rather than abruptly end.  Since this is a multiple
exposure using a filter wheel, I thought that the "dashes" might be due to
the short delay between exposures while the filter is being changed. 
Whatever it is, in moved only a couple arcminutes in a couple hours of
exposure time.

Also, the Crab Nebula is close to the ecliptic, so there are a lot of
main-belt asteroids in the area.  It looks like the direction of motion is
roughly parallel to the ecliptic.

Tom


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