ISO week 31 2025

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

Week begins: Monday, July 28, 2025

Notation:

Calendar

Date	Zodiac day	Events
Mon, Jul 28, 2025	7	α Ara — V 3 — Southern Summer Rastaban (β Dra) — V 3 — Northern Summer NGC 6369, Little Ghost Nebula, planetary nebula in Oph — V 11 — Finest NGC — Southern Summer
Tue, Jul 29, 2025	8	Rasalhague (α Oph) — V 2 — Tropical Summer Shaula (λ Sco) — V 2 — Southern Summer
Wed, Jul 30, 2025	9	Southern δ-Aquariids peak · radiant in Aquarius · expected ZHR ≈ 25 · Moon 35% illuminated: moderate moonlight interference · Use a dark site, allow 20–30 minutes for dark adaptation, and observe with the unaided eye. Watch a broad area of sky rather than staring directly at the radiant. α-Capricornids peak · radiant in Capricornus · expected ZHR ≈ 5 · Moon 35% illuminated: moderate moonlight interference · Use a dark site, allow 20–30 minutes for dark adaptation, and observe with the unaided eye. Watch a broad area of sky rather than staring directly at the radiant. Sargas (θ Sco) — V 2 — Southern Summer M6, Butterfly Cluster, open cluster in Scorpius — V 4.2 — Southern Summer M14, globular cluster in Ophiuchus — V 7.6 — Tropical Summer
Thu, Jul 31, 2025	10	Cebalrai (β Oph) — V 3 — Tropical Summer κ Sco — V 2 — Southern Summer C86, NGC 6397, globular cluster in Ara — V 5.6 — Southern Summer
Fri, Aug 1, 2025	11	🌓 First Quarter — 12:41:19 UTC
Sat, Aug 2, 2025	12	NGC 6503, galaxy in Draco — V 10.8 — Finest NGC — Arctic Summer NGC 6445, He 2-290, planetary nebula in Sagittarius — V 13 — Finest NGC — Tropical Summer
Sun, Aug 3, 2025	13	M7, Ptolemy's Cluster, open cluster in Scorpius — V 3.3 — Southern Summer M23, open cluster in Sagittarius — V 6.9 — Tropical Summer

Weekly Solar-System Ephemeris

Snapshot: July 28, 2025 · 00:00 UTC

Notation:

Naked Eye

☉︎ Sun	☽︎ Moon	☿︎ Mercury	♀︎ Venus	♂︎ Mars	♃︎ Jupiter	♄︎ Saturn
♌︎ 5°12′ β −0°00′	♍︎ 14°32′ β +0°24′	♌︎ 11°55′ β −4°52′	♊︎ 26°21′ β −1°43′	♍︎ 23°51′ β +0°40′	♋︎ 10°51′ β −0°05′	♈︎ 1°45′ β −2°21′
Observing
☉		☉

Extended targets:

⚳︎ Ceres	♅︎ Uranus	♆︎ Neptune	♇︎ Pluto
♈︎ 16°10′ β −12°36′	♊︎ 0°48′ β −0°13′	♈︎ 2°02′ β −1°21′	♒︎ 2°32′ β −3°45′
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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