Re: Obs rep and notes on Saturn Venus conjunction

On Jul 2, 4:37 pm, r...@xxxxxxxxxxxxxx (Rob Johnson) wrote:

Rob wrote:
I took an image of the conjunction as well, but with the
camera mounted at the prime focus of my 105mm refractor. I did use
a 2x barlow to get an EFL of 1470mm. This was about as much as I
could use and still get both planets in one frame.
<http://www.whim.org/nebula/astro/vsalign20070630.html>

Nice image. Because both the cusps of Venus's terminator and Saturn
are visible, it demonstrates the point I made about the ecliptic plane
reference frame that I made up-thread. It is hard to make an image
with both Saturn and Venus properly exposed. Thanks for posting it. -
Kurt

P.S. -

A couple of other science-ee notes for star parties this week and
Venus-Saturn:

5) Inferior planets exhibit maximum enlongation with respect to a
superior planet; Superior planets do not show maximum enlongation.

Venus past maximum enlongation about a month ago. Venus will reach
maximum brightness in about a week. Maximum elongation means the
apparent position of Venus (from Earth's orbit) is the furthest that
it gets from the Sun. For the next couple months, Venus will appear
to travel closer to the twlight setting Sun. Near maximum elongation,
Venus closer to Earth. The combination of its crescent phase and
proximity to the Earth result in its maximum brightness.

Because it is a superior planet, Saturn does not display maximum
elongation relative to the Earth. Conversely, if the Cassini orbiter
were to look back at Earth and Venus, both would be near maximum
elongation as seen from Saturn.

The JPL/NASA solar system planectia can be used to display a "from
above" image of the solar system to show relative planet positions.

http://space.jpl.nasa.gov/

Display the "Solar System" from "Above" and set the "field of view" to
2 degrees.

A 3-D diagram can be generated using the NASA-JPL small body orbit
simulator.

http://neo.jpl.nasa.gov/orbits/

Enter "Vesta" in the object box to generate a suitable display.

Suitable diagrams also are published each month in Sky & Telescope.

6) There unmanned orbiters at both Saturn and Venus returning
images.

Enjoyment of Earth-based visual observing of Saturn and Venus can be
enhanced by follow-up viewing of current oribter images of those
planets.

Saturn - Cassini
http://ciclops.org/index.php?flash=1&flash=1&js=1
http://saturn.jpl.nasa.gov/home/index.cfm
http://www.esa.int/SPECIALS/Cassini-Huygens/index.html

Venus - Venus Express
http://www.esa.int/SPECIALS/Venus_Express/index.html

NASA Cassini image returns are closer to real time. Like other ESA
missions (SMART-1), Venus Express image postings are made
infrequently, but are available.

- Kurt


.

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