ISO week 33 2025

This week is currently in preparation and will be published as part of the Star Almanack.

Week begins: Monday, August 11, 2025

Notation:

Calendar

Date	Zodiac day	Events
Mon, Aug 11, 2025	21	Kaus Australis (ε Sgr) — V 2 — Southern Summer
Tue, Aug 12, 2025	22	Perseids peak · radiant in Perseus · expected ZHR ≈ 100 · Moon 88% illuminated: strong moonlight interference · Use a dark site, allow 20–30 minutes for dark adaptation, and observe with the unaided eye. Put the Moon behind a building, tree, or other obstruction and watch the darkest open sky. α Tel — V 3 — Southern Summer M25, open cluster in Sagittarius — V 6.5 — Tropical Summer M69, globular cluster in Sagittarius — V 7.6 — Southern Summer NGC 6633, open cluster in Oph — V 5.6 — Finest NGC — Tropical Summer
Wed, Aug 13, 2025	23	M22, Sagittarius Cluster, globular cluster in Sagittarius — V 5.1 — Southern Summer
Thu, Aug 14, 2025	24	Vega (α Lyr) — V 0 — Northern Summer α Sct — V 4 — Tropical Summer Teapot of Sagittarius center — Asterism — V 1.8 — Southern Summer
Fri, Aug 15, 2025	25	Corona Australis center — Constellation — V 4.2 — Southern Summer Scutum center — Constellation — V 4.4 — Tropical Summer M26, open cluster in Scutum — V 8.0 — Tropical Summer M70, globular cluster in Sagittarius — V 7.9 — Southern Summer
Sat, Aug 16, 2025	26	🌗 Last Quarter — 05:12:14 UTC
Sun, Aug 17, 2025	27	β Sct — V 4 — Tropical Summer M11, Wild Duck Cluster, open cluster in Scutum — V 6.3 — Tropical Summer M57, Ring Nebula, planetary nebula in Lyra — V 8.8 — Northern Summer

Weekly Solar-System Ephemeris

Snapshot: August 11, 2025 · 00:00 UTC

Notation:

Naked Eye

☉︎ Sun	☽︎ Moon	☿︎ Mercury	♀︎ Venus	♂︎ Mars	♃︎ Jupiter	♄︎ Saturn
♌︎ 18°36′ β −0°00′	♓︎ 9°52′ β −0°47′	♌︎ 4°15′ β −3°13′	♋︎ 12°37′ β −1°00′	♎︎ 2°31′ β +0°30′	♋︎ 13°49′ β −0°04′	♈︎ 1°15′ β −2°25′
Observing
☉		☉

Extended targets:

⚳︎ Ceres	♅︎ Uranus	♆︎ Neptune	♇︎ Pluto
♈︎ 16°48′ β −13°27′	♊︎ 1°11′ β −0°13′	♈︎ 1°49′ β −1°21′	♒︎ 2°12′ β −3°46′
Observing

β = ecliptic latitude (+ north, − south). Observing combines visual magnitude with solar elongation. Two telescope glyphs = substantial telescope. ☉ = Near Sun — not currently observable.

Notation:

Planet Finder

Planet Finder — Mixed Learner — Mixed Learner

Sky Notes

Naked eye

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Binoculars

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Telescope

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