Opinion

A grand tour of the solar system

Thursday, June 11, 2009

Technically all nine planets have the possibility of being viewed during the month of June. I hear you. You said "nine" in a questioning manner. Yes, nine. I still consider Pluto to be a planet.

Alas, for us non-early risers, only one will be in the evening sky. That is our ringed friend, Saturn. It is just below Leo the Lion and can be found about 45 degrees above the southwest horizon beginning at about 9 p.m. local time.

Look for the backward question mark indicating Leo's head. The bright star Regulus is the point of the question mark. Saturn can be found a little more than the width of your fist held at arms length to the left of Regulus.

A telescope will show the almost flat ring plain. The ring plain has been closing for several months now and will be totally flat in September. An event we won't see because Saturn will be lost in the glow of the Sun.

If you really want to see this "parade of planets" set your alarm for 4 a.m., on Saturday, June 13. I know, I am sorry, but that has to be the time if you are really serious about planet hunting.

That morning head outside for a place with a real good view to the south and bring your binoculars. This will be easy because a 20-day old moon will be showing us the way to find Jupiter and Neptune, although the glow of the moon may wash out the dim outer planet, it is still worth a look. Again, don't confuse the star Mu Capricorni for the planet. The star is slightly to the right and level with Jupiter while Neptune is above and to the right on a line drawn from the moon to the king of planets.

OK, that's three planets. On Tuesday, June 16, again set your alarm for 4 a.m., grab the coffee and the binoculars and head out for your favorite dark place. This time, look to the southeast for a slender crescent of a moon with the very dim outer planet Uranus about six degrees to the lower right of the moon, a little more than the width of your binocular field of view. OK, that's four in the bag.

Now, I will have a little mercy on you. This time set the alarm for 4:30 a.m. on Friday, June 19. Look in the east, again for a slender crescent of a moon. Just to the moon's lower right a very bright Venus will be showing off. Between the moon and Venus will be a much dimmer Mars.

If you really want to test your viewing skills, check further down and left of the celestial trio and attempt to find the Pleiades star cluster, the Seven Sisters.

OK, now, that is six down and three to go and this next one will be a toughie. Since we are already out on the 19th, why not try for a very difficult to find Mercury. Binoculars at least will be needed and at the extreme a telescope. Look just beyond the Pleiades star cluster about as far and down and to the left of the Pleiades as the Pleiades are from Venus. Mercury will be a very small dot in the growing glow of the sunrise.

If you can't find it on the 19th, come back on the 21st at the same time and use an excruciatingly slender crescent moon to find the inner most planet. It will be level with the moon and a little more than the width of your binocular viewing field of view to the right.

OK, that's seven. Now, remember way back at the first of the column I said there was a "technical possibility" of viewing all the planets. Well, that is an extreme possibility because Pluto is in the sky, but a very large telescope combined with some astro-photography will be needed to find it. It is located just above the top of the lid on the tea pot shape of Sagittarius in the south at about 11:30 p.m. You will just have to take it by faith that it is there. That makes eight.

Wait, want about the ninth? Look down, you are standing on it.

SKY WATCH: I think that is about enough viewing for one week.

NEXT TIME: More astronomical blathering.

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  • You are absolutely right! Pluto is still a planet. Only four percent of the IAU voted on the controversial demotion, and most are not planetary scientists. Their decision was immediately opposed in a formal petition by hundreds of professional astronomers led by Dr. Alan Stern, Principal Investigator of NASA's New Horizons mission to Pluto. One reason the IAU definition makes no sense is it says dwarf planets are not planets at all! That is like saying a grizzly bear is not a bear, and it is inconsistent with the use of the term "dwarf" in astronomy, where dwarf stars are still stars, and dwarf galaxies are still galaxies. Also, the IAU definition classifies objects solely by where they are while ignoring what they are. If Earth were in Pluto's orbit, according to the IAU definition, it would not be a planet either. A definition that takes the same object and makes it a planet in one location and not a planet in another is essentially useless. Pluto is a planet because it is spherical, meaning it is large enough to be pulled into a round shape by its own gravity--a state known as hydrostatic equilibrium and characteristic of planets, not of shapeless asteroids held together by chemical bonds. These reasons are why many astronomers, lay people, and educators are either ignoring the demotion entirely or working to get it overturned. I am a writer and amateur astronomer and proud to be one of these people. You can read more about why Pluto is a planet and worldwide efforts to overturn the demotion on my Pluto Blog at http://laurele.livejournal.com

    -- Posted by laurele on Thu, Jun 11, 2009, at 3:25 PM
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