21 January 2015

KFOG Broadcast: January 21, 2015

Had a good show with Renee, Irish Greg and No Name at KFOG. The Morning Show is always a lot of fun, with twists and turns along the way. We talked about Astronomy apps, Aliens, Star Parties, Orion, Comet Lovejoy, Pluto and New Horizons, and more. Click here to listen.

20 January 2015

Moon and Venus in the West

lender Moon and Venus
Wednesday January 21st, a very slender young Moon and Venus form a compact group immediately after sunset. You'll need binoculars to spot this grouping, as the thin crescent Moon will be easily lost in the glare of the sunset sky, but bright Venus should be easier to spot. There's something magic about the sight of the thin crescent Moon, just barely glowing as a small bit of its illuminated side is visible to us, and that small light has to be seen through the glowing atmosphere with the refracted sunlight still filtering through it.

In San Francisco, the Sun sets around 5:20 pm so the view here should be accurate for 6:00 pm. You'll need a clear horizon due west to see this. Best of luck and happy viewing!

If you miss the view on Wednesday, look again on Thursday as the Moon sweeps past Mars.

09 January 2015

Close Encounters

Close Encounters
The evening sky features a close encounter with the two inner planets, Venus and Mercury. When two celestial objects align, the visual effect is usually quite brilliant. Venus is 100s of times brighter than smaller and more distant Mercury, but nonetheless the two make an impressive pair this weekend. You'll need a clear view to the south-west just after sunset. Binoculars will make it faster and easier to locate the pair. The two planets will remain in close proximity for several days. And next week, the old Moon and Saturn will also have a close encounter. There's always much to see in the sky.

Happy Viewing!

Image courtesy Sky & Telescope.

04 January 2015

Comet Lovejoy arrives in the night sky

Comet Lovejoy C/2014 Q2
Comet C/2014 Q2 Lovejoy has arrived in the night sky for viewers in the Northern Hemisphere, and in the coming days promises to be a fine sight especially through binoculars or a telescope, shimmering in green light with a slight tail. The comet is on a trajectory around the Sun and will pass nearest to Earth on January 7th, but given the geometry of its path, it will be ideally placed for viewing over the next few weeks as it rises high into the southern sky and as the Moon moves from Full to Waning phase. The finder chart, courtesy of Sky & Telescope, shows the daily movement of the comet across the backdrop of stars.
Path of Comet Lovejoy
I had good success finding it on January 1st despite the glow of the Waxing Moon, and look forward to tracking it down as soon as the moonlight begins to fade in a week. Stay tuned for updates. 

More information can be found in this excellent article from Sky & Telescope: http://www.skyandtelescope.com/astronomy-news/observing-news/spot-comet-lovejoy-tonight-122920141/

25 December 2014

The "Zero G Day" Hoax

Fake tweet
I enjoy the occasional science hoax, and the resurgence of the "Zero G Day" hoax brings a smile to my face. It is a claim that on January 4th, 2015 at 9:47 PST, gravity on Earth will be momentarily diminished due to an alignment of Pluto and Jupiter. There is just enough science in the claim to make many believe it could be true, but in fact it's far from the truth, just a fun prank started by the astronomer Patrick Moore years ago. Nonetheless, if thousands of people jump at that moment, we can test out the theory that the Earth might move if everyone jumped at once, a scientific idea explored well by the science video series from Vsauce.

I like this hoax almost as much as the "Mars will be bigger than the Full Moon" hoax that surfaces every year. It's getting harder to separate fact from fiction in our socially-networked world. I look to Slate's Phil Plait and his Bad Astronomy blog for this, along with snopes.com.

23 December 2014

Moon and Mars

Moon and Mars
The lunar month starts with the slim crescent Moon glowing in the western sky, sweeping past the bright orange beacon of Mars and the faint stars of Capricornus. Venus is just starting to appear in the west after sunset, so if you have a clear view of the western horizon, look for it shortly after sunset. It will soon be higher and easier to spot as 2014 comes to an end.

Image courtesy Sky & Telescope.

26 November 2014

Lunar Month Begins

Lunar Month Begins
Thanksgiving in the USA is accompanied by a young Moon,  a few days into the lunar cycle and the new lunar month. I enjoy the changing face of our nearest neighbor in the Solar System, a lovely sight early in its cycle. This week we'll see the Moon pass near Mars and then wander through the faint constellation Capricorn, en route to encounters with Neptune and Uranus. The San Francisco Bay Area is being graced with clear, crisp November nights so when the Sun sets after your Thanksgiving dinner, step outside and enjoy the view to the west, and a few hours later you'll also see the spectacular bright stars and constellations of winter rising in the east.

Image courtesy Sky & Telescope.

15 November 2014

Leonid Meteor Shower 2014

I enjoy the annual Leonids meteor shower for many reasons, not the least of which is that it is my birthday meteor shower, peaking on my birthday each year. The peak of the Leonids comes on the evening of November 17 into the early morning hours of November 18, and this year the Moon is a thin waning crescent in the early morning and won't disrupt the viewing of meteors. So, get a warm blanket and a clear view of the sky and enjoy this annual shower that promises

Leonid 'Radiant'
Like all meteor showers, they are caused by a remnant of a celestial object, most often a comet or asteroid that leaves a wake of particles that intercept the Earth's atmosphere on a predictable annual basis. The Leonids are caused by Comet Temple-Tuttle that orbits the Sun every 33 years. The debris stream from Temple-Tuttle is littered with sand-like particles that glow and shine in the upper atmosphere when they strike it at thousands of miles per hour, creating the beautiful 'shower' of light. Under dark skies you can see 10-20 Leonids per hour, so set your expectations appropriately and be patient. You can't hurry a meteor shower - let it come to you and present itself in all its splendor. This year Jupiter adds to the mix, now in a location near the center of Leo and therefore near the 'radiant' of the shower. Here's to clear skies and good viewing.

Here are more detailed write-ups. I found the Sky & Telescope article to be quite informative.



Image courtesy of Sky & Telescope.