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Comet C/2023 A3 (Tsuchinshan-ATLAS) is well on its way to becoming the best comet since 2020. Observations submitted to the Comets Section place the comet around magnitude 3 with a visual tail up to 2 degrees in length. It is currently a morning object very low in the east during twilight and will continue to be into the first days of October. One can find a plot here showing the elevation of the comet at the start of nautical twilight. Needless to say, a clear sky and a low, unobstructed horizon are needed. But don’t fret; the comet will rapidly climb into the evening sky by mid-October as a 1st to 2nd magnitude object, perhaps even with a prominent anti-tail reminiscent of C/1956 R1 (Arend-Roland). Follow the development of Tsuchinshan-ATLAS on the Comets Section page.

Image by Chris Schur on 2024 Sept 23 12:15 UT. 8" f/2 RASA, ZWO ASI2600MC, RGB = 3 mins total. 10 second subs. The images are about 40 seconds apart as the comet rose over the Mogollon Rim in northern Arizona.

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Solar Maximum Reached
10/16/2024

NASA Logo In a conference today NASA, NOAA, and the International Solar Cycle Prediction Panel announced that the Sun is in its solar maximum period where sunspots, flares, and other activity are at their greatest. This period will last approximately a year according to scientists. Such activity can lead to aurora, such as those seen deep into the continental US last week. Scientists will not be able to determine the exact peak of this solar maximum period for many months because it's only identifiable after they've tracked a consistent decline in solar activity after that peak.

Jupiter's Turbulent GRS
10/9/2024

NASA logo The Hubble Space Telescope focused on Jupiter's iconic Great Red Spot for the first three months of this year. The scientists found that the storm is jiggling like gelatin, squeezing in and out at the same time as it moves faster and slower. UV observations also demonstrated that the core is brightest when the spot is at its greatest size during the oscillations.

Check the Events Calendar

All Times are in Universal Time (UT)

2024-10-19 21:00
Moon 0.2° north of Pleiades

2024-10-21
Orionid meteor shower

2024-10-24 08:03
Last Quarter Moon

2024-11-01 12:47
New Moon (lunation 1260)

2024-11-04 01:00
Antares 0.08° north of Moon, occultation Indonesia

2024-11-09 05:55
First Quarter Moon

2024-11-11 02:00
Saturn 0.09° south of Moon, occultation Polynesia to Azores

2024-11-12
Equinox - Northern Spring/Southern Autumn;NPH breaking up

2024-11-15 21:29
Full Moon

2024-11-16
Leonid meteor shower

Explore our Galleries

Credit: Gregory Shanos
Equipment: 25cm f/10 SCT, ASI178MM
Cloud structure in our sister planet is revealed in this UV image from June, 2023.

Credit: Gary Walker
Equipment: 254mm APM refractor
The GRS approaches the central meridian with ovals A7 and A8 below it in this image from earlier in 2024

Credit: Bill Flanagan
Equipment: Canon EOS D6 with 200mm lens
Detailed view of the corona and its streamers are seen in this beautiful HDR shot.

Credit: Mike Hood
Equipment: SCT 356mm f/11
Multiple blue-white cold fronts extend southward from the North Polar Hood. Such "north polar fronts" are analogous to the jet streams that extend southward over North America every springtime on Earth.

Learn about the ALPO

The Association of Lunar and Planetary Observers (ALPO) is an international organization devoted to study the Sun, Moon, planets, asteroids, meteors, and comets. Our goals are to stimulate, coordinate, and generally promote the study of these bodies using methods and instruments that are available within the communities of both amateur and professional astronomers.

The ALPO collects and analyzes observations of various Solar System bodies and associated phenomena and publishes detailed reports concerning these bodies in its quarterly publication the Journal ALPO, otherwise known as The Strolling Astronomer. Membership in the ALPO includes receiving our journal, and back issues can be found in our Publications section.

We welcome and provide services for all individuals interested in lunar and planetary astronomy. For the novice observer, the ALPO is a place to learn and to enhance observational techniques. For the advanced amateur astronomer, it is a place where one's work will count. For the professional astronomer, it is a resource where group studies or systematic observing patrols add to the advancement of astronomy. Further details about the ALPO can be found here.

There are a range of membership levels available starting with annual dues of only $22. See the footer below for links on how you can become a member today.

Join ALPO

The Association of Lunar and Planetary Observers (ALPO) is an international organization devoted to study of the Sun, Moon, planets, asteroids, meteors, and comets. Celebrating our 75th anniversary in 2022, our goals are to stimulate, coordinate, and promote the study of these bodies using methods and resources available to both amateur and professional astronomers.

The science of astronomy has never been more exciting or dynamic than it is today - for the novice observer, the ALPO is a place to learn and enhance one’s observational techniques. For the advanced amateur astronomer, it is a place where one's work will matter. And for the professional astronomer, it is a resource where group studies or systematic observing patrols add to the advancement of astronomy.

ALPO members range from enthusiastic individuals with the desire to pursue an initial interest in astronomy to advanced amateurs to professional astronomers deeply involved in lunar and planetary astronomy.

Becoming a member is easy, and we welcome you to join us as we explore and learn more about this vast universe we all call home. Simply select one of the options below to get started.

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