Orionids from Istanbul in 2026

Orionids from Istanbul: the short answer

For Istanbul, Orionids maximum lands at 21:23 on 21 October 2026. Culmination 05:25 at 64.6° — that is 90% of what the same stream would deliver with the radiant overhead — and the ceiling on the rate is 18.0 meteors an hour.

That ranks it 4th of twelve from Istanbul this year, behind the Geminids (148.2/h) and the Perseids (85.0/h).

The radiant track over this city

At 41.0°N a declination-+15.7° radiant traces an arc from 22:28 to 12:21, topping out at 64.6° at 05:25 bearing 180°. Inside the dark window it only manages 64.1°, and that lower figure is the one the rates are built from. The radiant currently lies in Orion.

When it gets dark here

The dark hours here run 19:46 to 05:51 — 10 h 5 min of astronomical night, bracketed by sunset at 18:14 and sunrise at 07:23. Civil twilight ends at 18:42; anything earlier than that is wasted effort.

Local solar midnight, the true middle of the night, falls at 00:48 here rather than at 00:00: Europe/Istanbul runs 64 minutes ahead of mean solar time at 28.95°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

Moonlight is the limiting factor on this night from Istanbul. The Moon is 79% lit and only 4 of 12 sampled hours are moon-free. Moonrise 15:53. Moonset 03:01. At the best hour it stands 22.0° below the horizon, pulling the limiting magnitude down to 6.50.

Why 18 an hour and not 20

The published ZHR of 20 assumes the radiant overhead and a sky at limiting magnitude 6.5. Here the radiant reaches 64.1° inside the dark window and the limiting magnitude at the best hour is 6.50, which with r = 2.5 gives 18.0 an hour. Entry speed is 66.1 km/s.

Hour by hour the modelled rate runs from 0.0 at 19:00 (radiant -29.3°) to 8.0 at 06:00 (radiant 63.5°), peaking at 18.0. That spread across 12 hours is why a "what time" answer beats a "how many" answer.

The stream comes from Comet 1P/Halley and is listed as active 2 October to 7 November, so 21 October 2026 is the best night from Istanbul rather than the only one.

Watching from around Istanbul

Istanbul is the 6th largest of the 300 cities covered here, with a population of 15.70 million at 39 m above sea level. The nearest other cities on the site are Bursa (91 km S), İzmir (328 km SSW), Ankara (352 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.