Tony Dunn
@tony873004
Followers
19K
Following
8K
Media
2K
Statuses
5K
Orbit simulations of planets, comets, asteroids, spacecraft, and other interesting stuff. Amateur astronomer. BA: Physics & Astronomy, SFSU.
San Francisco
Joined April 2010
2025 QD8 will brighten to mag 13.7, moving at 20k "/hour on Tuesday night / Wednesday morning. Here is a view from San Francisco skies.
0
1
13
Imaging may be tricky as they are moving very quickly across your field of view. 2025 OQ7 will brighten to mag 14.5 on Saturday night / Sunday morning as it races across the sky at 10k "/hour. Here is a view from San Francisco skies. Sim:
1
5
19
Two newly-discovered asteroids, 2025 QO7 and 2025 QD8 will pass closer than the Moon in the next few nights. They may be bright enough to image in your #eVscope or other backyard set up. @Unistellar
5
81
232
Introducing Planet Y (cyan), warping the Kuiper Belt’s mean plane. Here's a simulation of Planet Y and the 46 TNOs mentioned in the new paper by @TheAmirSiraj
4
15
46
#Asteroid (669952) Kootker, named after @LisetteKootker, was discovered by @Marco_Langbroek and @sarneczky. Most named asteroids are common main-belters. Not Kootker. It is in an 8:11 librating resonance with Mars. So in a rotating frame, it traces a striking path. #astronomy
5
45
122
Just to answer a few FAQs:. 2025 PF2 is ~2-6 meters 🦒. It missed Earth by ~22,000 km (altitude).at a speed of ~13 km/s. 2025 PU1 is about ~1-3 meters🏋️. It missed Earth by about 29,000 km (altitude).at a speed of ~10 km/s.
9
32
213
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
35
205
935
The "phase" of the airplane and the phase of the Moon match quite nicely. Good job!.
Good mooning, passengers & crew!!!.✈️🌖 Edinburgh to Geneva, Airbus A320-214 .@EDI_Airport @easyJet @easyJet_press @AirbusPRESS @Airbus @StormHour @ThePhotoHour
2
3
43
A spacecraft that loops endlessly between Earth & Moon without extra fuel? . See this 1:1 Earth–Moon cycler from @RossDynamicsLab’s “Stable, Low-Energy Prograde Earth–Moon Cycler Orbits”.📄 🖥️ Simulation: #astronomy
8
62
274
Yes. It's not just a 0.5 meter splash like a fun day at the beach. It's a 0.5 meter wall of water that hits, and then just keeps coming and coming without stop.
@tony873004 I just heard a report, back then in 2011, someone in Papua died from 0.5m tsunami.
3
3
37
#SanFrancisco, a 1-foot tsunami is not the same as a 1 foot tide. It is a wall of water in motion. It's the energy, not the height, that's dangerous. Don't go to the beach to watch this. #tsunami.
11
27
175
Trans Neptunian object 2020 VN40 is in a 10:1 resonance with Neptune. Here is an animation holding Neptune stationary so you can see this resonance.
4
30
116
July’s full Moon will be another “not-quite-full” Moon. Right now, the southern limb is in shadow, but over the next 12 hours the shadow will shift to the northern limb, where it’ll be clearly visible at peak.
4
5
39
July 10's Full Moon, competes with June's full Moon for lowest full Moon in years. Many northern hemisphere locations will not see it at all. Here's the waxing gibbous from #SanFrancisco today.
3
12
85
from 2023. .
Newly-discovered #asteroid 2023 NT1 passed about 1/4 the Moon's distance on July 13, but wasn't discovered until July 15, as it approached Earth in the daytime sky. It may be as large as 60 meters across, possibly larger than the asteroid that caused Meteor Crater in Arizona.
2
15
94
RT @Science_Release: ATLAS彗星に関する内容、もうプレプリントとか早すぎるよ！.直径約20kmというのは、小惑星のアルベド約0.05を仮定しての算出結果なのを再確認。あの時には彗星かどうか断定されてなかったからね。.なので彗星だと確認されている現在では、….
0
16
0