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San Jose Astronomical Association @sjastronomy.bsky.social · 19h

These transits occur during a six-month window every 15 years, as the Earth passes through the plane of Titan's orbit, which is closely aligned with the plane of Saturn's rings. The first transit of this cycle occurred in April, and the last one was on Sunday, which will not happen again until 2038.

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San Jose Astronomical Association @sjastronomy.bsky.social · 19h

The shadow of Saturn's largest moon, Titan, transited Saturn from Earth's vantage point on October 5, 2025. Luckily, member Christos Gougoussis captured the transit using his Celestron C11 telescope and ZWO ASI462MC camera. 🔭 🧪

Black background. Somewhat grainy image of Saturn, with the rings almost edge on to our view from Earth. At the ten o’clock position, a dark spot is seen. That is the shadow of Saturn’s largest moon, Titan.

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San Jose Astronomical Association @sjastronomy.bsky.social · 2d

Having an unobstructed view of the eastern horizon will allow for observing the Moon/Pleiades pair sooner, as they are lower in the sky. The bright moonlight will wash out any naked eye view of the Pleiades. But if you have binoculars or a telescope, the view will be more favorable.

- Joe Fragola

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San Jose Astronomical Association @sjastronomy.bsky.social · 2d

Mid-occultation will occur around 9:20 pm with the Moon sitting in the middle of the Pleiades cluster at an elevation of almost 11°. The occultation will end around 11 pm with the Moon and Pleiades at an elevation of 29°.

So, if the skies are clear Thursday night, step outside and take a look.

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San Jose Astronomical Association @sjastronomy.bsky.social · 2d

From San Jose, next week's lunar occultation of the Pleiades begins before 8 pm local time, while the Moon is still below the horizon. At Moonrise (8:12 pm), the occultation will continue, but it will still be a while before the Moon climbs high enough in the sky to get a good view.

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San Jose Astronomical Association @sjastronomy.bsky.social · 2d

Occultations are fairly common and can involve different combinations of objects. Lunar occultations occur when the Moon blocks the view of a planet or background star(s). Stellar occultations also happen when the light of a star is blocked by a planet or asteroid.

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San Jose Astronomical Association @sjastronomy.bsky.social · 2d

As the waning gibbous Moon rises on Thursday, October 9, it will be passing in front of the famous Pleiades star cluster (aka Messier 45). This type of event, known as an occultation, occurs when one celestial object temporarily blocks the view of another object. 🔭 🧪

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San Jose Astronomical Association @sjastronomy.bsky.social · 9d

Join SJ Astronomy for our next Starry Nights Star Party - Saturday, October 11, 2025, 7:30 pm. 🔭 🧪

You must be a member of the SJ Astronomy Meetup group to register to attend (it's free): www.meetup.com/sj-astronomy/

Link for October 11 Starry Nights registration: www.meetup.com/sj-astronomy...

Black background, white text. Text: by SJ Astronomy - Starry Nights Star Party - Saturday, October 11, 2025, 7:30 pm. RSVP on Meetup. Inset image: Banner of stars and star clusters across the middle of the graphic.

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San Jose Astronomical Association @sjastronomy.bsky.social · 14d

Member Brad Haakenson captured this lovely image of the entire Veil Nebula on Monday night, September 22, 2025. It was a beautiful night at Rancho Cañada del Oro Open Space Preserve – warm with no dew and very clear. The seeing even improved through the night. 🧪 🔭

Alt Text
Astrophotograph of the entire Veil Nebula, seen as wisps of gas and dust forming a variety of shapes, from the hooded Eastern Nebula on the left to Pickering’s Triangle in the middle and the Witch’s Broomstick on the right.

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San Jose Astronomical Association @sjastronomy.bsky.social · 21d

Comet 3I/ATLAS is the third known interstellar object, discovered in July, and is on a fast approach toward the Sun. It is currently about magnitude 14.8 and located in the constellation of Libra, between Zubenelgenubi and Zubeneschamali.

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San Jose Astronomical Association @sjastronomy.bsky.social · 21d

Comet 3I/ATLAS is getting lower in the sky but should be capturable with a smart scope and would be a good challenge object for larger telescopes in dark skies this week, leading into the new moon.

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San Jose Astronomical Association @sjastronomy.bsky.social · 21d

Member Michael Madden captured interstellar comet 3I/ATLAS using his Seestar S50 on September 13, 2025, at Rancho Cañada del Oro Open Space Preserve during a Starry Nights event. The Seestar was able to capture about 40 minutes of light until 3I/ATLAS disappeared below the ridge to the southwest. 🔭

Astrophotograph showing numerous stars. In the center are two red lines, one vertical and one horizontal, indicating the location of interstellar comet 3I/ATLAS, seen as a faint fuzzy dot trailing a fuzzy tail to the lower right.

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San Jose Astronomical Association @sjastronomy.bsky.social · 23d

Timelapse of the sunspots from the last Solar Sunday at Houge Park, September 7, 2025. This timelapse was captured over 2 hours, with over 8,000 pictures taken. It was taken on a Seestar S30 by member Creighton Voon.

#space #science #astronomy #astrophotography

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Reposted by San Jose Astronomical Association

David Blanchflower BSc @davidbflower.bsky.social · 26d

Five celestial events to look out for this autumn. 🔭 🧪 www.bbc.co.uk/weather/arti...

Supermoons and meteor showers: Five celestial events to look for this autumn

From supermoons to meteor showers, Elizabeth Rizzini has your guide to what may delight in the autumn night skies.

www.bbc.co.uk

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San Jose Astronomical Association @sjastronomy.bsky.social · 27d

PUBLIC TALK: October 4, 2025, 7:30 pm

Our October meeting is for you to share your unique telescope builds, tell the story behind your favorite astro-photos, pass on image processing tips, or share brief astro-travelogues. 🔭 🧪 #BayArea

Sign up at our Meetup: www.meetup.com/sj-astronomy...

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San Jose Astronomical Association @sjastronomy.bsky.social · Sep 3

PUBLIC TALK: September 6, 2025, 7:30 pm

Dr. Katya Arquilla will discuss how long-duration exploration missions present challenges more intense than those encountered in low-Earth orbit.

Sign up: www.meetup.com/sj-astronomy...

#astronomy #bayarea 🔭 🧪

The challenges of crewed long-duration exploration missions to the Moon and Mars, Sat, Sep 6, 2025, 7:30 PM | Meetup

Come join us for our monthly Astronomy talk! 7:30pm-8pm: Social time with snacks  8pm: Talk begin Title: **The challenges of crewed long-duration exploration missions to

www.meetup.com

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Reposted by San Jose Astronomical Association

David Blanchflower BSc @davidbflower.bsky.social · Sep 1

Tomorrow morning Venus continues to appear close to the Beehive Cluster. 🔭 🧪 🎨 #astrophotography #SciArt #photography

The beehive cluster of star dots at centre. Planet Venus disc lower right of frame.

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San Jose Astronomical Association @sjastronomy.bsky.social · Aug 25

Another great image from last week’s event at the Rancho Cañada del Oro Open Space Preserve! This picture of the Western Veil Nebula (Caldwell 34) and Pickering’s Triangle comes from member Kal Krishnan, using two hours of data with a dual-band (L-Enhance) filter on his Astro DSLR. 🔭 🧪

The Western Veil Nebula is in the upper right, curving from top to the right, shown in purples and pinks. Pickering’s Triangle is on the left and “pointing” toward the center. Background stars fill the image.

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San Jose Astronomical Association @sjastronomy.bsky.social · Aug 22

Member Doug Loyer captured this fantastic image of the Elephant Trunk Nebula (IC 1396A) earlier this week from the Rancho Cañada del Oro Open Space Preserve.

Collection and processing detail: Askar 120 APO, 63 x 60s images, ASI533MC, ZWO Duo Filter

Processed using Nebula Magic 🔭

#astrophotography

A red nebula reaches up through the night sky, vaguely shaped like the trunk of an elephant. Several bright stars dot the foreground of the image while many smaller stars are scattered throughout.

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San Jose Astronomical Association @sjastronomy.bsky.social · Aug 21

Apologies, everyone! The date on the graphic is correct: September 6, 2025, 7:30 pm. #bayarea 🔭 🧪

San Jose Astronomical Association @sjastronomy.bsky.social · Aug 19

PUBLIC TALK: July 12, 2025, 7:30 pm

Dr. Katya Arquilla will discuss how long-duration exploration missions present challenges more intense than those encountered in low-Earth orbit.

Sign up: www.meetup.com/sj-astronomy...

#astronomy #bayarea 🔭 🧪

Text: THE TALK: The Challenges of Crewed Long-duration Exploration Missions to the Moon and Mars With Dr. Katya Arquilla, September 6, 2025, 7:30 pm, Houge Park, San Jose, CA. Inset photos: (top left) Photo of Dr. Katya Arquilla sitting in a NASA chair in front of two monitors and looking back at the camera. (top right) A group of four scientists in numbered space suits, working together with a robot dog in a Mars analog site on Earth. (bottom) A panoramic view of the Mars analog site, with red sedimentary rock in the foreground and thicker layered rock cliffs in the background, plus four scientists in orange jumpsuits on top of a mound.

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San Jose Astronomical Association @sjastronomy.bsky.social · Aug 19

PUBLIC TALK: July 12, 2025, 7:30 pm

Dr. Katya Arquilla will discuss how long-duration exploration missions present challenges more intense than those encountered in low-Earth orbit.

Sign up: www.meetup.com/sj-astronomy...

#astronomy #bayarea 🔭 🧪

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San Jose Astronomical Association @sjastronomy.bsky.social · Aug 18

A rare Titan shadow-transit season is happening now! Saturn’s largest moon is casting its shadow on the ice giant every 16 days through early October. So grab a telescope (3-in+), aim at dawn, and don’t miss this once-in-15-years chance. 🔭 🧪

skyandtelescope.org/astronomy-ne...

Titan Shadow Transit Season Underway

Titan shadow transits are rare, occurring only about every 15 years. Don't miss the chance to see one this observing season.

skyandtelescope.org

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Reposted by San Jose Astronomical Association

David Blanchflower BSc @davidbflower.bsky.social · Aug 15

Tomorrow Jupiter continues to appear close to Venus. Look east from around 3am. If awake enjoy the sight, if asleep have nice dreams. 🔭 🧪 🎨 #astrophotography #SciArt #photography #StormHour #ThePhotoHour

Planet Venus dot below centre. Planet Jupiter dot above centre.

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Reposted by San Jose Astronomical Association

EarthSky @earthskyscience.bsky.social · Aug 14

Would you like to see the #Andromeda galaxy? Here's how. 🌌

Tonight, try star-hopping to the Andromeda galaxy - 2.5 million light-years away - from the constellation #Cassiopeia. If your sky is dark, you might even spot this hazy patch of light with no optical aid.

buff.ly/zgwwj0y

📸 EarthSky.

Star chart of constellations Cassiopeia and Andromeda with labeled Andromeda galaxy between them.

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San Jose Astronomical Association @sjastronomy.bsky.social · Aug 13

Many thanks to the amazing rangers and staff at Yosemite National Park for helping to make this year's SJAA-led Glacier Point star party a huge success! The crescent moon rising over Half Dome, as seen in this all-sky timelapse taken on July 19th, perfectly punctuated this phenomenal experience. 🔭

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