Perseids from Hanoi in 2026

Perseids from Hanoi: the short answer

For Hanoi, Perseids maximum lands at 09:00 on 13 August 2026. Culmination 05:43 at 53.1° — that is 80% of what the same stream would deliver with the radiant overhead — and the ceiling on the rate is 75.0 meteors an hour.

That ranks it 2nd of twelve from Hanoi this year, behind the Geminids (147.2/h).

The radiant track over this city

The radiant rises at 21:11 bearing NNE, culminates 53.1° up at 05:43 towards north (0°), and sets at 14:12. It lies inside Cassiopeia. The rate scales with the sine of that altitude, so 53.1° buys you 80% of a zenith radiant.

When it gets dark here

Hanoi loses the Sun at 18:28 and gets it back at 05:34. True astronomical darkness — the only part that counts for faint meteors — runs 19:47 to 04:16, 8 h 29 min out of 11 h 6 min of night.

Local solar midnight, the true middle of the night, falls at 00:01 here rather than at 00:00: Asia/Bangkok runs 3 minutes behind mean solar time at 105.84°E. That offset is why the best hour on this page is not the hour you would guess from the clock.

What the Moon does here

The Moon is 0% illuminated and below the horizon for 11 of the 11 sampled dark hours, so moonlight subtracts essentially nothing here. Moonrise 05:52. Moonset 18:15. At the best hour the limiting magnitude reaches 6.50 — the reference sky's full value.

Why 75 an hour and not 100

Converting ZHR 100 into something useful for Hanoi means multiplying by sin(52.2°) and dividing by 2.2 raised to (6.5 − 6.50). That lands at 75.0 meteors an hour, from fast 58.8 km/s entries.

Hour by hour the modelled rate runs from 0.0 at 19:00 (radiant -9.5°) to 1.4 at 05:00 (radiant 52.2°), peaking at 75.0. That spread across 11 hours is why a "what time" answer beats a "how many" answer.

The stream comes from Comet 109P/Swift-Tuttle and is listed as active 17 July to 24 August, so 13 August 2026 is the best night from Hanoi rather than the only one.

Watching from around Hanoi

Hanoi is the 32nd largest of the 300 cities covered here, with a population of 8.05 million at 10 m above sea level. The nearest other cities on the site are Haiphong (89 km ESE), Nanning (324 km NE), Haikou (482 km ESE) — close enough that the radiant altitudes barely change, far enough that sunset and moonrise do.

What this page does not know

Light-pollution data for this location is not connected yet. Rates on this page are computed against the reference rural sky the zenithal hourly rate is defined for (naked-eye limiting magnitude 6.5); they are not a claim about how bright the sky is where you are standing. Once the light-pollution layer is connected these figures will be recomputed for the local sky and will generally fall.

Cloud cover is a forecast, not a constant, so it is resolved when you load the tonight card and is deliberately absent from this prerendered page — the hourly table shows "unavailable" rather than assuming clear skies. Meteor outbursts, local terrain and building horizons are not modelled.

A single observer with an unobstructed horizon typically records 30–50% below the ideal-sky figure. Give your eyes twenty minutes to adapt, keep bright screens away, look about halfway up the sky rather than straight at the radiant, and count for a full hour before judging a shower.