Tony Dunn

@tony873004 • 20,030 subscribers

Orbit simulations of planets, comets, asteroids, spacecraft, and other interesting stuff. Amateur astronomer. BA: Physics & Astronomy, SFSU.

Shorts

4,411,461 views

114,362 views

270,863 views

321,031 views

128,342 views

29,586 views

129,836 views

30,637 views

31,230 views

22,919 views

21,807 views

14,139 views

13,905 views

14,090 views

Videos

sweetdream.ai

Watch Anya Live

Anya is streaming live right now! Join her private show and enjoy exclusive content.

Private Show

Join now for exclusive access

Free preview available • Premium content

4,005,510 views • 3 months ago

442,783 views • 1 month ago

261,196 views • 7 months ago

63,128 views • 2 months ago

91,493 views • 4 months ago

85,286 views • 6 months ago

83,882 views • 8 months ago

88,336 views • 9 months ago

154,888 views • 1 year ago

This media may contain sensitive content.

108,404 views • 1 year ago

33,213 views • 4 months ago

42,287 views • 7 months ago

36,404 views • 6 months ago

79,817 views • 1 year ago

77,297 views • 1 year ago

31,708 views • 7 months ago

42,641 views • 1 year ago

11,897 views • 3 months ago

19,144 views • 6 months ago

13,026 views • 4 months ago

Live Cam

Tony Dunn

Shorts

3rd interstellar object discovered? Maybe. There's a lot of buzz right now in the Astro community. More observations should come in tonight to confirm if A11pI3Z is from beyond the solar system.

A rocket booster will slam into the Moon on August 5. 2025-010D is the upper stage of a Falcon 9 rocket that brought the Blue Ghost Mission 1 to the Moon.

Interstellar #comet 3I/ATLAS is hidden on the far side of the Sun from Earth. But today it sweeps past Mars, where orbiting spacecraft have ringside seats. Let’s hope they look up. #astronomy #NASA

New observations came in over night. Here's A11pl3Z's updated path. It now passes inside Mars' orbit. In yesterday's animation, the camera was below the ecliptic. This is from above, so if it looks mirrored, that's why. #astronomy #A11pl3Z

10 #asteroids passed closer than the Moon in a 5-day period from September 23-28. All were discovered this month. The largest up to 41 meters wide. #astronomy

Apophis will race through Earth's sky at naked-eye brightness in less than 3 years.

#asteroid 2024 YR4 and 200 clones pass through the Earth-Moon system on Dec 22, 2032. Three of these clones hit Earth. Another hits the Moon.

October's comets. SWAN C/2025 R2, and Lemmon (C/2025 A6). Our interstellar visitor 3I/Atlas aka C/2025 N1, is unfortunately on the wrong side of the Sun for viewing, but I included it anyway because... well... it's interstellar. #Astronomy

#Asteroid 2024_YR4 may collide with the Moon 🌙. Its nominal trajectory, based on updated observations, shows a lunar impact on Dec 22, 2032. But the odds of collision remain low.

Georgia bolide: A fiery visitor streaked through the sky today, dropping meteorites across the Peach State. The devil might’ve gone down to Georgia, but this one came in fast from above. This animation is an educated guess at its path. #Atlanta #Georgia #Astronomy #Meteor

8 new Near-Earth Asteroids have been discovered by the Vera Rubin Observatory from just 10 hours of sky scanning over the course of a few nights. Imagine what Rubin will do when it's fully operational. #LSST #RubinObservatory #NEO

🚨 New dwarf planet candidate: 2017 OF201 🚨 ~700 km wide, now 90.5 AU from the Sun. Orbit: a = 838 AU, q = 44.9 AU — deep into the inner Oort Cloud. Possibly part of a hidden population totaling ~1% of Earth’s mass. 📄 Paper: #astronomy #dwarfplanet

#Asteroid 2025 FC tried hard to avoid detection. The 3-10 meter rock approached Earth from the daytime sky. Shortly after close approach of 60,000 km over the South Pacific Ocean, it briefly hid in the Earth's shadow before being detected.

Happy Halloween. Yesterday, #asteroid 2024 UG9 buzzed Earth just 2476 km above the Indian Ocean. 6 hours later, it passed 18279 km above the Moon. It is the size of a giant pumpkin 🎃.

Videos

Watch Anya Live

Asteroid 2025 MH348 discovered last year is possibly a trojan of Neptune. #astro 🔭

Artemis II doesn’t reverse direction. Far out, its motion is mostly radial (toward Earth), so its small eastward speed is slower than Earth’s rotation, so it appears to drift west. Closer in, tangential speed grows and overtakes Earth’s rotation, so it moves east.

After billions of years heading towards us, interstellar comet #3IATLAS is currently at its closest approach to the Sun right NOW. Perihelion. #astronomy #comet

A view of Earth from Artemis II. If you can see your region, then you might be able to spot Artemis II with a telescope or binoculars.

In 1 year from today, Voyager 1 will be one light day from the Sun. 🔭

18 asteroids passed closer than the Moon in November. And every one of them was discovered this month. #Astronomy

In the last 6 days, 9 asteroids passed inside the Moon’s orbit. Estimated sizes: ~1–38 m. All were discovered this month, a reminder that countless small, faint NEOs slip by unnoticed until they make a close pass.

In the past 3 days, two asteroids — 2025 PF2 and 2025 PU1 — passed closer than the geostationary satellites delivering our preseason #NFL games this weekend. #asteroid #astronomy

Newly-discovered #asteroid 2024 UQ impacted Earth's atmosphere off the coast of North America early yesterday morning. It was 1-2 meters wide.

Sensitive content

Saturn has 128 newly-discovered moons. Here they are color-coded by their MPEC release. Orange: MPEC 2025 E153, Purple: MPEC 2025-E154, Green: MPEC 2025-E155.

Polaris is not always the North Star. Due to Earth's precession, over the course of 26,000 years, Polaris, Alderamin, Vega, and Thuban take turns as the closest prominent star to the celestial pole.

Watch Earth’s newest quasi-moon in motion. 🌍🌀 The new paper “Meet Arjuna 2025 PN7” confirms #asteroid 2025 PN7 is trapped in a quasi-satellite orbit, looping around Earth (in a rotating frame) from the 1960s to the 2080s.

The ESCAPADE mission to Mars is about to launch. It will stay near Earth for about 1 year before using an Oberth maneuver to send it to Mars.

Another October comet? Recently-discovered A11bP7I may be a Sun-grazing comet poised to put on a show in late October.

The #EuropaClipper mission will launch today. After Mars and Earth flybys, it will arrive at Jupiter in 2030. It will study the habitability of Europa, and possibly confirm the existence of its subsurface ocean.

What if Juno left Jupiter to get a closer look at interstellar comet 3I/ATLAS? With a couple of burns, Juno can get as close as 25 million km. Purely hypothetical, fun orbital mechanics! 🔭 Thanks Adam Hibberd I4IS for the research and trajectory data.

Newly-discovered #comet C/2025 K1 (Atlas) will be a northern hemisphere gem for much of the rest of the year, making 2 close approaches to Earth: 0.58 AU in August, and 0.40 AU in November.

Lunar eclipse begins soon. If you were on the Moon, it would be a solar eclipse. Here's a view from the Moon.

Asteroid 2022 RD₂ will become a mini-moon not once, but three times in 2043–2044. This may not exactly look like an orbit, But during each capture, if the Sun suddenly vanished, RD₂ would remain gravitationally bound to Earth indefinitely.

116 years of Barnard's Star: 1940 to 2056. Proper motion and parallax are visible. The field of view is ~ as wide as the full Moon. #astronomy