Backyard Astronomy: August 2016

backyard_astro

Here are some fun astronomical events you and your family can enjoy in the month of August. All you need is an inexpensive telescope or binoculars for most of these events, but some of them are viewable with the naked eye.

August 12-13: Perseids Meteor Shower. Meteor showers occur when the Earth moves through a cloud of debris left behind by a comet. The Perseids are debris from Comet Swift-Tuttle. As meteor showers go, this one is top-notch, producing many bright streaks and up to 60 meteors per hour at its peak. The shower runs every year from July 17th to August 24th, but will peak on the night of the 12th and the early morning of the 13th. Look in the direction of the constellation Perseus after midnight for your best chance.

August 16: Mercury at Greatest Eastern Elongation. Mercury will be at its greatest apparent distance (~27 degrees) from the Sun in the sky. It can be a little tricky to observe tiny Mercury as it follows the setting Sun on the Western horizon. The closer you are to the equator, the higher Mercury will be in the sky before it descends, and the easier it will be to see it.

August 27: Conjunction of Jupiter and Venus. You don’t want to miss this one. A conjunction occurs when two or more planets appear to overlap or come very close together in the sky. (Remember, in terms of their physical separations, these planets are still very far away from each other.) This conjunction will take place just after sunset, when Jupiter and Venus will appear less than a tenth of a degree away of each other on the sky. That’s super-close!

Backyard Astronomy: November 2015

backyard_astro

There’s not a lot going on in the November sky, but here are couple events you and your family can enjoy, with or without binoculars.

November 5,6: Taurids Meteor Shower. Meteor showers occur when the Earth moves through a cloud of debris left behind by a celestial object, like a comet. The Taurids are unusual in that they are debris from two objects: Asteroid 2004 TG10 and Comet 2P Encke. The meteors will appear to radiate from the constellation Taurus. As meteor showers go, this one is wimpy, with a modest 5-10 meteors per hour at its peak. The shower runs every year from September 7 to December 10, but will peak after midnight in the early morning of the 6th.

November 17,18: Leonids Meteor Shower. The Leonids are debris from Comet Tempel-Tuttle, and appear to radiate from the constellation Leo. As meteor showers go, this one is average with 15 meteors per hour at its peak. The shower runs every year from November 6th to November 30th, but will peak after midnight in the early morning of the 18th.

Backyard Astronomy: October 2015

Here are several fun astronomical events you and your family can enjoy in the month of October — plus, a reminder for the lunar eclipse at the end of September. All you need is an inexpensive telescope or binoculars for most of these events, but some of them are viewable with the naked eye.

Reminder! September 27-28: Total Lunar Eclipse. A total lunar eclipse occurs when the Earth moves between the Sun and the Moon (see below). Unlike a solar eclipse, in which the Moon moves between the Sun and the Earth, you don’t need any protective eyewear to watch a lunar eclipse. During the eclipse, the Moon will gradually get darker, ultimately turning red in color. The lunar eclipse will be visible from the Americas, Europe, Africa, and parts of Asia. See here to determine visibility and times in your part of the world.

lunar_eclipse

October 1: Comet C/2013 US10 Catalina. This comet was discovered on Halloween 2013. It could be bright enough to be visible with the naked eye in the Southern hemisphere by the beginning of October. By mid-November, it should be bright and visible in the North.

October 8: Draconids Meteor Shower. Meteor showers occur when the Earth moves through a cloud of debris left behind by a comet. The Draconids are debris from Comet 21P Giacobini-Zinnere, and appear to radiate from the constellation Draco. As meteor showers go, this one is kind of paltry with a modest 10 meteors per hour at its peak. The shower runs every year from October 6th to October 10th, but will peak in the early evening of the 8th.

October 16: Mercury at Greatest Western Elongation. Mercury will be at its greatest apparent distance from the Sun in the sky (~18 degrees). Mercury is best observed in the morning, just before sunrise.

October 21,22: Orionids Meteor Shower. The Orionids are debris from Comet Halley, and appear to radiate from the constellation Orion. As meteor showers go, this one is average with 20 meteors per hour at its peak. The shower runs every year from October 2nd to November 7th, but will peak the night of the 21st and early morning of the 22nd.

October 26: Venus at Greatest Eastern Elongation. Venus will be at its greatest apparent distance (~46 degrees) from the Sun in the sky. It’s a great time to observe Venus, because it’ll be highest in the sky in the morning, just before sunrise.

October 26: Conjunction of Jupiter and Venus. A conjunction occurs when two or more planets overlap, or appear very close together, in the sky. This is the second conjunction of these two planets this year (the closest occurred in July). In the early morning of the 26th, just before sunrise, Jupiter and Venus will appear within 1 degree of each other on the sky, which is the same distance as two Moon diameters.

October 28: Conjunction of Jupiter, Mars, and Venus. This is a rare three-planet conjunction, in which Jupiter, Mars, and Venus form a 1-degree triangle on the sky. It will be visible in the early morning of the 28th, just before sunrise.

Backyard Astronomy: September 2015

Here are some fun astronomical events you and your family can enjoy in the month of September. All you need is an inexpensive telescope or binoculars for most of these events, but some of them are viewable with the naked eye.

September 4: Mercury at Greatest Eastern Elongation. What this means in plain language is that Mercury will be at its greatest apparent distance (27 degrees) from the Sun in the sky. It’s a great time to observe Mercury, because it’ll be highest in the sky in the evening, just after sunset.

September 23: September Equinox. During an equinox, the Sun shines directly onto the equator, so there is an equal amount of day and night everywhere in the world. This marks the first day of fall in the Northern Hemisphere (Autumnal Equinox), and the first day of spring in the Southern Hemisphere (Vernal Equinox).

September 27-28: Total Lunar Eclipse. A total lunar eclipse occurs when the Earth moves between the Sun and the Moon (see below). Unlike a solar eclipse, in which the Moon moves between the Sun and the Earth, you don’t need any protective eyewear to watch a lunar eclipse. During the eclipse, the Moon will gradually get darker, ultimately turning red in color. The lunar eclipse will be visible from the Americas, Europe, Africa, and parts of Asia. See here to determine visibility and times in your part of the world.

lunar_eclipse

Backyard Astronomy: August 2015

Here are some fun astronomical events you and your family can enjoy in the month of August. All you need is an inexpensive telescope or binoculars for most of these events, but some of them are viewable with the naked eye.

August 7: Mercury, Jupiter, and Regulus will be within one degree of each other in the sky.

August 12-13: Perseids Meteor Shower. Meteor showers occur when the Earth moves through a cloud of debris left behind by a comet. The Perseids are debris from Comet Swift-Tuttle. As meteor showers go, this one is top-notch, producing many bright streaks and up to 60 meteors per hour at its peak. The shower runs every year from July 17th to August 24th, but will peak on the night of the 12th and the early morning of the 13th. Look in the direction of the constellation Perseus after midnight for your best chance.

August 19: Mars will appear to cross in front of the Beehive Cluster, an open cluster of stars located in the constellation Cancer.

August 29: Super Moon. The Moon will be at its closest approach to the Earth during its full moon phase, making it a little bigger and brighter than usual. This will be the first of three Super Moons for 2015.

Backyard Astronomy: June 2015

Here are some fun astronomical events you and your family can enjoy in the month of June. All you need is an inexpensive telescope or binoculars for most of these events, but some of them are viewable with the naked eye.

May 30 – June 4: International Space Station Observing Season. Believe it or not, it’s easy to see the ISS with the naked eye as it passes over the Earth. It’s got a fair amount of surface area that reflects sunlight, which means the best time for spotting it is when the sky is dark but the ISS is lit by the Sun — before sunrise or after sunset. Because of its highly inclined orbit, the ISS approaches full illumination as we near either of the solstices. During this period the ISS will be in permanent illumination, making it easy to spot. Universe Today explains how to prepare for ISS observing season. And here is a handy NASA website for predicting ISS sightings by location and date. By the way, you know how to distinguish it from airplanes, right? Unlike airplanes, the ISS has no blinking lights on it.

June 2: Full Strawberry Moon. A full Moon occurs when it’s on the opposite side of the Earth from the Sun, with the half that’s facing us fully illuminated. When it coincides with the peak of strawberry season, it’s known as a Full Strawberry Moon. Contrary to what you might think, this is not the best time to observe the Moon through a telescope. It’s not only too bright through most telescopes, but you don’t get to see the dramatic shadows on mountains and craters along the terminator (the line that separates the illuminated part from the shadowed part) that you do when the Moon is going through other phases. However, a full Moon can be enjoyed either with the naked eye or through a pair of binoculars. With a decent pair of binoculars, you should be able to see a lot of craters and some of the crater rays emanating from giant craters like Tycho and Copernicus (find them on this handy Moon atlas).

June 6: Venus at Greatest Eastern Elongation. What this means in plain language is that Venus will be at its greatest apparent distance (~45 degrees) from the Sun in the sky. It’s a great time to observe Venus, because it’ll be highest in the sky in the evening, just after sunset.

June 21: June Solstice. If you’re in the Northern Hemisphere, it’s the first day of summer. Enjoy the longest day of the year with a BBQ and a star party! If you’re in the Southern Hemisphere, it’s the first day of winter. You’ll have a longer observing night than the Northerners!

June 24: Mercury at Greatest Western Elongation. This means Mercury will be at its greatest apparent distance from the Sun in the sky (~22 degrees). Mercury is best observed in the morning just before sunrise.

Backyard Astronomy: July 2014

A bit late in posting this, but there isn’t much going on this month, anyway.

July 29-30: Delta Aquarid Meteor Shower. This shower runs mid-July to mid-August and peaks the night of the 29th / the early morning of the 30th. The meteors are debris from Comets Marsden and Kracht. The expected rate is a moderate 20 meteors per hour.

Backyard Astronomy: June 2014

June 7: Conjunction of the Moon and Mars. Conjunction is when two celestial objects line up along the line of sight from the Earth. For instance, during the New Moon phase, the Moon is in conjunction with the Sun. During this month’s Moon-Mars conjunction, the two objects will come within two degrees of each other in the sky. It’s not super-close — by way of comparison, the angular size of the Moon is just half a degree — but it makes for a nice pairing for binoculars or a telescope.

Moon - Mars conjunction

 

June 22 – July 2: June Boötids meteor shower. As far as meteor showers go, this one’s pretty wimpy. The expected rate is one to two meteor per night, though on rare occasions there can be strong outbursts. Unlike most meteor showers, this one is best viewed in the evening hours.

Camelopardalid “storm” a dud

Oh, by the way, the much-anticipated Camelopardalid meteor “storm” (camelopardala)didn’t live up to the hype. We were clouded out here in Central Texas, so I didn’t even get a chance to try to watch it. After predictions of possibly hundreds of meteors per hour, the actual tens per hour that were observed must’ve been pretty disappointing to those who had clear skies and tried to watch.

Astronomy and Astrophysics curriculum officially announced

Astronomy and Astrophysics

It’s official:

Today we are officially announcing the publication of ASTRONOMY AND ASTROPHYSICS, a curriculum created by Dr. Sarah Salviander, a research scientist whose areas of particular interest are quasars and supermassive black holes. She is a research scientist at the University of Texas, is one of the authors of “Evolution of the Black Hole Mass – Galaxy Bulge Relationship for Quasars in the Sloan Digital Sky Survey Data Release 7” and “Narrow Emission Lines as Surrogates for σ * in Low- to Moderate-z QSOs” in addition to many other scientific papers, and teaches classes as a visiting professor of physics at Southwestern University. Dr. Salviander describes the new curriculum at Castalia House:

“Look around the web for a high-quality, modern-science astronomy homeschool course and you won’t find much. There are a handful of scripture-based astronomy courses that seem to cover little more than the seasons and motions of the night sky, and one very expensive software-based curriculum. I realized there was a need for a comprehensive, modern, and affordable astronomy homeschool curriculum, and set out to develop one based on my years of teaching astronomy at the university level. A couple of years ago, I mentioned this in an offhand way to Vox Day; it turns out Vox had been contemplating offering a series of affordable, electronically-available homeschool curricula, and so we began to discuss the possibility of making astrophysics the first of many such courses.”

The course is suitable for ages 13+ with the appropriate background in mathematics — basic algebra and geometry — but there is no science prerequisite. It was designed primarily with homeschoolers in mind, but it would also work very well in public/private high schools, either as a conventional science course or as an independent study for motivated students. It is also suitable for adults who wish to learn about astronomy and astrophysics in a self-guided continuing education sort of way.

We’ve had at least one person ask whether the course is suitable for students in the Southern Hemisphere. The answer is yes, mostly, with the exception of a couple of lab activities; I’m going to look into adapting the two lab activities that only work in the Northern Hemisphere. If anyone has other questions about the curriculum, don’t hesitate to contact me.