[AZ-Observing] Re: Pleiades Occultation
- From: "Randy Peterson" <rgpeterson@xxxxxxx>
- To: <az-observing@xxxxxxxxxxxxx>
- Date: Fri, 14 Aug 2009 11:23:01 -0700
I recorded the eclipse and occultation you mentioned last night from about
00:47 am till almost 01:00 am. Io started out eclipsing the smaller Europa,
and then transitioned into an occultation that lasted almost 12 minutes. My
recording started over 15 minutes before the event, and ran until 15 minutes
after the event. The moons are clearly separated 15 minute out, but were
difficult to distinguish as distinctly separate within about 6 minutes
before/after the event. I used a 2x barlow with a low-light video camera on
my f/10 SCT.
The light from Europa being blocked by Io last night resulted in a predicted
drop of 0.8 magnitude in brightness. This was not readily visible to me on
the monitor, but I plan to digitize the recording and produce a graph of the
event showing the light drop.
There are 32 events in the next couple months of one of Jupiters moons
occulting or eclipsing another one. Some of these result in a magnitude
drop of 0 (!), but one of the better ones is on August 21 starting about
03:35 am, +/- 1.5 minutes, when Io eclipses Europa with a resulting
magnitude drop of 0.8. This event is predicted to last a little over 15
minutes. More at
http://www.hristopavlov.net/SatWatcher/2009-8-21-10-42-44-Io(I)_Europa(II).html
The largest magnitude drop of the 32 predicted events is on September 30
starting about 00:05 am, +/- 48 seconds. Io will eclipse Europa again. It
is predicted to drop over 1 magnitude, which may be visible visually. The
duration of this event is a bit over 8 minutes. More at
http://www.hristopavlov.net/SatWatcher/2009-9-30-7-9-56-Io(I)_Europa(II).html
Randy Peterson
----- Original Message -----
From: "Wayne (aka Mr. Galaxy)" <mrgalaxy@xxxxxxxx>
To: <az-observing@xxxxxxxxxxxxx>
Cc: <haclist@xxxxxxxxxxxxxxx>; <taaaforum@xxxxxxxxxxxxxxx>;
<amastro@xxxxxxxxxxxxxxx>
Sent: Friday, August 14, 2009 10:28 AM
Subject: [AZ-Observing] Re: Pleiades Occultation
15480 Empire Rd.
Benson, AZ 85602
hm ph: 520-586-2244
Hi Tom,
I watched the Alcyone occultation this morning after having observed Jupiter
for a couple hours. I started the evening literally trying to find a good
location on my property to look at Saturn with its edge-on rings. I finally
found a decent spot, but by that time Saturn was very low. I could see the
flattened ball of the planet, no rings, but the moon Titan was seen. I then
spent some time looking at a few double stars, most notably, Izar in Bootes,
nu Scorpii, Antares, and epsilon Lyrae, all fully resolved, with very good
seeing, though it was very humid and lots of lightning activity to the
southeast. I then watched Jupiter with the Great Red Spot followed very
closely by a smaller, red barge that I think will collide with the GRS very
soon. The NEB showed lots of detail with a few large white ovals indenting
it on the north edge. As I observed the GRS I noticed that two of Jupiter's
moons were approaching each other. Their relative movement was surprisingly
fast and if th
ere was an eclipse or transit I missed it, but I saw the moons nearly meld
into one another. All that while, I kept watching for the impact area, but I
could not see it. Has it faded out or was there too much moisture building
up on my optics that I didn't realize?
Clear skies,
Wayne (aka Mr. Galaxy)
---------- Original Message ----------
From: Tom Polakis <tpolakis@xxxxxxx>
To: AZ-Observing@xxxxxxxxxxxxx
Subject: [AZ-Observing] Pleiades Occultation
Date: Fri, 14 Aug 2009 5:25:24 -0400
There is currently a nice occultation of the Pleiades by the Third Quarter
moon in progress. The humidity is at monsoon levels in Arizona, adding a
bit of undesirable haze to the scene, but it's clear. Here is a grab with
my Canon 20D through a TV101. 1/2 second at ISO 200 showed the Earthshine
and stars best, but unfortunately also showed the haze.
http://members.cox.net/tpolakis/astro/IMG_9081.jpg
The moon is moving roughly right to left in this scene. Electra has just
emerged, and Alcyone is about to be covered.
Tom
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