jump to navigation

NameExoWorlds: An IAU Worldwide Contest to Name Exoplanets and their Host Stars | Press Releases | IAU July 10, 2014

Posted by aquillam in Astronomy.
Tags: ,
add a comment

NameExoWorlds: An IAU Worldwide Contest to Name Exoplanets and their Host Stars | Press Releases | IAU.

You wanted some input into naming all those new planets, now you’ve got it. The IAU set up  www.NameExoWorlds.org  to help collect suggestions and vote on the winners. Participation is free, so visit as often as you want!

Urban observing July 2014 July 2, 2014

Posted by aquillam in Astronomy, Urban Observing.
Tags: , , , , , , ,
add a comment

I guess time flies when you’re having fun, because the start of July really snuck up on me.

Special Events

Aphelion occurs on July 3. This is the day when the Earth is farthest from the Sun. Clearly, our distance from the Sun is not related to the temperature outside here in the northern hemisphere!

Meteor Showers

July and August bring some of the best meteor showers of the year. The July ones in particular tend to have prolonged peaks, so there are many good nights for watching meteor showers. The June Bootids are winding down as the month begins. A weak shower, this one is primarily worth watching because the radiant is near zenith at 1 AM, which is not only a good position, it’s also after Moonset, which eliminates at least one big source of light pollution. Mid July brings the Alpha Capricornids, active July 11 – August 10. The peak will be the night of July 29, but it’s a wide peak, so a night or two on either side should be good too, a timeframe that happens to coincide with the new moon and the next few nights. Although it typically only produces about 5 meteors an hour, a relatively high number of fireballs makes it worth watching anyway, even from poor urban skies. The Delta Aquariids are active from July 21st to August 23rd with the peak on July 28. This is a strong shower with a rate of around 16 meteors per hour, but often fairly dim meteors with few fireballs. However, it is one of the best showers for observers in the tropics.

Locations of the radiants of the Alpha Capricornids and  Delta Aquariids.

Locations of the radiants of the Alpha Capricornids and Delta Aquariids on July 28 at 2 AM. Image made with Starry Night.


The full moon is July 12 at 7:25 UT. That’s 3:25 AM local time Ann Arbor. New Moon falls on the 26th, so the end of the month is your best chance for deep sky observing.


Mercury returns to the morning sky at the opening of the month. It reaches greatest Westward elongation on the 13th. It is at it’s closest to Venus on the 16th, and they make a rather nice pair in the predawn sky.

Venus is in the middle of the image, Mercury about half way beteen Venus and the horizon. The first rays of dawn appear to the left of Mercury.

Looking ENE half an hour before dawn on July 16. Image made with Starry Night.

Venus is still slowly making its way towards superior conjunction. It starts the month close to the red giant Aldebaran. Look for it among the stars of Gemini’s feet along with a very old moon, Mercury, and a rising Orion on July 24 at 5:30 in the morning in Ann Arbor.

A very thin crescent moon is next to Venus, which is above Mercury.

Venus, Mercury, and a very old moon about 45 minutes before sunrise on July 24. Image made with Starry Night.

Mars and the star Spica make a striking pair in the evening skies this month. They’re at their closest to each other on July 13. On July 5, the first quarter Moon will pass less than a degree from Mars, making it possible to get both into the field of view of a small telescope.

Mars and the Moon are practically on top of each other.

Looking SSW at 10 PM on July 5. Mars and the Moon are in conjunction. Image made using Starry Night.

Jupiter is basically lost in the glare of the sun this month. Conjunction occurs on the 24th, so look for it to reappear in the morning skies in August.

Saturn is the gem of the evening skies this month. Look southward at 10 PM all month to find it. On July 7, a fat first quarter moon passes less than half a degree from Saturn.

Saturn and the Moon are practically on top of each other.

Looking SSW at 10 PM on July 7. Saturn and the Moon are in very close conjunction.

Deep sky objects

As the nights lengthen, it becomes reasonable to look for deep sky objects at 10 or 11 PM again. M13, the great cluster in Hercules is one of the nicest globular clusters in the sky. It’s also relatively easy to find, being not far from one of the stars in the Keystone. Not far away are two more nice globular clusters, M3 and M92.

Several consellations and some of the brighter deep sky objects are marked

Looking toward zenith while facing south (ie north is at the top, east is to the left.) Click for a larger version. Image made using Starry Night.

You can’t beat summer nights for planetary nebulae. M57 is one of the higher surface brightness nebulae, and is relatively easy to find, being located between two stars in Lyrae. An OII or nebula filter can make this pop out of even some pretty bad city skies. Nearby, if you have darker skies, you’ll be able to see the larger but lower surface brightness dumbbell nebula. It’s a tough catch from Ann Arbor, but not completely impossible.

If you’re a fan of open star clusters, two of the nicest, the butterfly cluster (M6) and Ptolemy’s cluster (M7), finally make it above the horizon at a reasonable time in the end of July. Not far from the double star Shaula in the tail of Scorpius, these can be a bit tough to spot in light polluted skies, but if you can get them in your telescope, they’re well worth it.

Sagittarius, Scorpius, and several star clusters are marked.

Looking south on July 22nd at 11 PM. Image made with Starry Night.


Buying a Name for a Celestial Object June 17, 2014

Posted by aquillam in Astronomy.
Tags: ,
add a comment

Recently there have been a number of new offers to name things, from the old star naming offers to lunar features and Mars craters, and now exoplanets. So the question is, are these legit?

The answer is probably not.

The IAU is the recognized organization for naming things not on this planet. They publish the Gazetteer of Planetary Nomenclature. This is the resource used by NASA, ESA, astronomers, space scientists, and the makers of astronomy software. 

The USGS hosts the Gazetter, and they have a nice, succinct response the the question of whether or not you can pay a fee to name a crater on Mars. Basically, no.

Some organizations offering to sell names have some counter arguments to get you to buy it anyway. Here are a few.

No one “owns” the naming rights. 

True, sort of. No one “owns” the naming rights to roads, townships, states, or other municipalities either. If you want to start calling the road you live on “my road”, no one can stop you. You could even publish maps, put up signs (on your property), and give it to others as your mailing address. However, the Post Office is not obliged to deliver using that address. Your local municipality provides the official records, and if you don’t follow official channels, official names don’t get changed. For more on how astronomical objects get named officially, visit the IAU page on Naming Astronomical Objects.

Unlike those other companies, we publish our database.

Great. Again, you can publish your own maps with “my road” as the name of the road you live on, but until you get it officially recognized, it’s not going on official maps, etc. If  the organization selling the names can convince the space agencies, astronomers, space scientists, and software companies to use its database, it could end up on the official maps anyway. However, space agencies, astronomers, space scientists, and software companies are very unlikely to use databases from commercial, for-profit entities (If a NASA scientist took the picture that revealed the existence of a crater, why should s/he have to pay to name it??)

The IAU relaxed its stance, saying it would accept input from the public for names.

True, but they still have rules, like no living person, and no political, religious, or otherwise divisive names.  The rules for public naming campaigns also includes the following statement: “The process cannot request nor make reference to any revenues, for whatever purpose.” So if you paid money for a name, the IAU explicitly says it doesn’t count.  

However, this last item does mean that if you want to name something, and the name follows the rules, you can suggest it to the IAU for free. Find the section on the IAU page on Naming Astronomical Objects  about the kind of object you want to name and follow the directions for who to contact. 

Ovation Aurora moved June 16, 2014

Posted by aquillam in Astronomy.
Tags: ,
add a comment

A while ago, I blogged about the ovation aurora site for aurora predictions. At that time it was still in “beta” mode, being tested. The Space Weather Prediction Center has finished it’s testing and moved it to production.

You can now find the OVATION Aurora site at http://www.swpc.noaa.gov/ovation/

For general reference, in Ann Arbor, a Kp index of 7 means we should be able to see aurora, as long as its dark enough.


Get every new post delivered to your Inbox.

Join 224 other followers