Monday, October 6, 2014

Lunar Eclipse of October 8, 2014.

There will be a lunar eclipse in a couple days. Observing lunar eclipses are easy, you need to know roughly what time to look and go outside at the right time. If you have a window facing the correct direction you might not need to go outside.

  • If you live in North or South America it will be visible during the morning of October 8.
  • If you live in Asia or Australia it will be visible during the evening of October 8.
  • If you live in Europe or Africa, it will not be visible at all.

The above information is approximate (the location of visibility is somewhat smaller than indicated above), for more detailed information see this web site:

Thursday, September 25, 2014

The Future of Peach Mountain

Since the late 1970's, the University Lowbrow Astronomers have operated a 24" Cassegrain telescope located on "Peach Mountain." Peach Mountain in turn is located within "Stinchfield Woods," property owned by the University of Michigan (UM for short).

It is unclear where the name came from. With an elevation of 315 meters (1033 feet), Peach Mountain can't compare with mountains in other parts of the country. You would be forgiven if you called it a big hill. The connection with peaches or someone named Peach is unclear.

From 1960 to 2010, the Astronomy Department at UM operated a 26 meter (85 feet) radio telescope at Peach Mountain. After 2010, the Astronomy Department ceased operations at Peach Mountain (they still have access to telescopes in Arizona and other parts of the world).

The Department of Aerospace Engineering (also at UM) is in the process of upgrading the radio telescope. When the upgrades are complete, it will be used to communicate with artificial satellites.

For information about the upgrade, see this PDF document (a handout given during a tour of the facility on September 18, 2014):

For more information about the history of Peach Mountain see:

Friday, September 12, 2014

University Lowbrow Astronomers mentioned in Sky & Telescope

Many club members are regular readers of "Sky & Telescope," a magazine with articles aimed at amateur astronomers. Look at the October issue, the club is mentioned in two places....

Page 10: Club member Jim Abshier sent an e-mail which described his radio telescope observations of quasars.

Page 69: The University Lowbrow Astronomers contributed 30 loaner telescopes to the Ann Arbor District Library. For more information on the Library's telescope loaner program, see

Correction: What was reported in Sky & Telescope wasn't correct. The Lowbrows made adjustments to a set of telescopes purchased by the Library. After the adjustments, the telescopes were made available through the telescope loaner program.

Saturday, September 6, 2014

60 foot asteroid to pass close to earth

An asteroid estimated to be about 60 foot in size is expected to pass close to the earth on Sunday.

The asteroid named 2014 RC will not hit the earth, is not bright enough to see naked eye, but should be visible in a telescope.

This is about the same size as the meteor that exploded over the city of Chelyabinsk in Russia over a year ago.

For more details...

Monday, August 18, 2014

The First Planetary Nebula Spectrum

Sky and Telescope has an article "The First Planetary Nebula Spectrum." 150 years ago this month was the first time anyone had take spectrum of a planetary nebula.

At the time the word "nebula" covered a variety of objects that were visible in telescopes, but whose composition was not understood. The observed spectrum gave important clues about one type of nebula, namely the planetary nebula.

See this link....

Sunday, July 27, 2014

Calendar of Astronomy Events in Southeast Michigan

The University Lowbrow Astronomers (Lowbrows for short) maintains an astronomy calendar. This calendar is focused on events in the Southeast Michigan area and includes:

  1. Open Houses at Peach Mountain Observatory (located near Dexter Michigan).
  2. Club Meetings of the Lowbrows (held on the central campus of the University of Michigan).
  3. Other astronomy events that may be of interest in the Southeast Michigan Area.

You don't need to be a club member or affiliated with the University of Michigan to attend these events. There are four different ways to view the calendar:

1. Go to the web page:

2. If you have an Android tablet or smartphone, you can download the Lowbrow App at

This app is free. You can view the calendar directly from the app.

3. If you use a calendar program that supports the ICAL format (such as Google Calendar), you can subscribe to the Lowbrow Calendar by using the subscribe function within your calendar program. This will allow you to view Lowbrow events along with the events in your personal calendar and/or other calendars. When subscribing to the calendar, you will be asked for a URL. This is the URL:

4. If you use a calendar program that supports the ICAL format (such as Google Calendar), you can take a snapshot by downloading this file:

and importing it into your program. The events in the Lowbrow calendar will be added to events already in your calendar, but if there are changes to the Lowbrow calendar they will not be automatically incorporated into your calendar without a subsequent import.

Thursday, July 3, 2014

Ceres, Vesta and Pluto

Ceres and Vesta will be very close to each other over the next few days. (That is they appear to be close to each other when observed through a telescope).

What are Ceres and Vesta? Ceres is the largest asteroid and the first to be discovered, Vesta is the second largest asteroid and the fourth to be discovered. They are too dim to be seen naked eye, but bright enough to be easily seen in a small telescope (provided you know where to look). There is more information on this Sky and Telescope article....

Pluto reaches best visibility on July 4th, though it is possible to observe it for some time. Pluto is not visible naked eye, but if you know exactly where to look, it is possible to see it in many amateur telescopes (provided it is large enough or if the sky is dark enough). The trick is to know which of the many dots of light in the field are stars and which is Pluto. More information on this page....

When Ceres was discovered, it was considered to be a new planet. There was something called the "Titius-Bode Law", which predicted how far each planet should be from the sun. This relationship was reasonably accurate in describing the planets from Mercury to Uranus if you assumed there was a missing planet between Mars and Jupiter. (Neptune and Pluto had yet to be discovered). Ceres seemed to be that missing planet.

Over time when other objects were discovered between Mars and Jupiter, such as Pallas (an asteroid somewhat smaller than Vesta) and Vesta, they too were considered planets. However as more and more objects were found eventually it no longer made sense to consider any of them as planets; we now call them asteroids.

Since that time Neptune and Pluto were discovered and added to the list of planets. Eventually most scientists came to the conclusion that the Titius-Bode law was mere coincidence, and not a useful tool for predicting the existence of new planets. It did not correctly predict Neptune's distance from the sun, and it only predicted one object between Mars and Jupiter, not the multitude of objects now known.

Beginning twenty years or so ago, there was reason to question the status of Pluto. Objects beyond Pluto were discovered. Some are known as Kuiper-Belt objects after one of the astronomers who predicted their existence. Others are in a region called the "Scattered Disk." One of the later is bigger than Pluto. All these objects (along with Pluto and the so far unobserved Oort Cloud objects) are collectively called TNOs (trans-Neptunian objects). So it is still reasonable to consider Pluto as the ninth planet, or is it merely one of many TNOs?

Now some argued that objects in the solar system should be divided based on size. If so we have "large" objects that are in "hydrostatic equilibrium" (that is they are large enough that gravity forces them to be round). And we have smaller objects (which are generally lumpy-not round). All the traditional planets (including Pluto) would be "large". Also in this group would be Ceres, the largest moons of the solar system (including the Earth's Moon), and the largest TNOs. This list includes between 30 and 40 known objects and almost certainly includes dozens of objects yet to be discovered. This does not include the smaller asteroids (that is all asteroids except Ceres and Vesta), comets, the smaller moons and the smaller TNOs. Vesta is generally considered too small to be in hydrostatic equilibrium; however whether it is or is not is debatable.

It seemed that a clear definition of the word planet was needed. The word has always been poorly defined. With the discovery of a TNO bigger than Pluto, the issue could no longer be avoided. A definition of planet was constructed that included all of the traditional planets, with the notable exception of Pluto, and did not include any other object in hydrostatic equilibrium (moons, Ceres, the handful of large TNOs).

The definition essentially says a planet must be in hydrostatic equilibrium, and it must be the dominant gravitational object in its vicinity. This cuts off Pluto (which is under the influence of Neptune) and the other TNOs (which are under the gravitational influence of other TNOs). It cuts off Ceres (which is under the influence of Jupiter and other asteroids), and it cuts off moons (as each is under the influence of its parent body). Objects that are not planets would be called a moon if they were in a clear orbit around another object, or a dwarf-planet if they are large enough to be in hydrostatic equilibrium, not a moon, and didn't dominate their environment gravitationally. Both Pluto and Ceres are considered dwarf-planets. Vesta is probably not a dwarf-planet. This definition was adopted by the International Astronomical Union (IAU) in 2006.

An alternate argument for excluding Pluto goes as follows: Pluto is very different than rocky planets (such as Earth and Venus) and it is very different than the gas planets (such as Jupiter and Saturn). Pluto is best described as a "dirty snowball" and as such is very similar to Kuiper-Belt objects. In fact it makes sense to say that Pluto is a Kuiper-Belt object.

Note, not everyone is happy with the IAU definition...

For more reading, here are some Wikipedia articles on the topics in this post....