ISO week 20 2025

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

Week begins: Monday, May 12, 2025

Notation:

Calendar

Date	Zodiac day	Events
Mon, May 12, 2025	24	🌕 Full Moon · Milk Moon — 16:55:56 UTC β Cha — V 4 — Antarctic Spring C3, NGC 4236, spiral galaxy in Draco — V 9.7 — Arctic Spring C26, NGC 4244, Silver Needle, spiral galaxy in Canes Venatici — V 10.6 — Finest NGC — Northern Spring NGC 4214, galaxy in Canes Venatici — V 10.2 — Finest NGC — Northern Spring NGC 4216, galaxy in Virgo — V 11 — Finest NGC — Tropical Spring
Tue, May 13, 2025	25	Big Dipper center — Asterism — V 1.8 — Northern Spring M40, Winnecke 4, double star in Ursa Major — V 8.4 — Northern Spring M61, spiral galaxy in Virgo — V 9.7 — Tropical Spring M99, spiral galaxy in Coma Berenices — V 9.9 — Tropical Spring M106, spiral galaxy in Canes Venatici — V 8.4 — Northern Spring NGC 4274, galaxy in Coma Berenices — V 11.3 — Finest NGC — Northern Spring
Wed, May 14, 2025	26	Corvus center — Constellation — V 2.9 — Tropical Spring M84, lenticular galaxy in Virgo — V 9.1 — Tropical Spring M85, lenticular galaxy in Coma Berenices — V 9.1 — Tropical Spring M100, spiral galaxy in Coma Berenices — V 9.3 — Tropical Spring C108, NGC 4372, globular cluster in Musca — V 7.8 — Antarctic Spring NGC 4361, planetary nebula in Corvus — V 10.9 — Finest NGC — Tropical Spring NGC 4388, galaxy in Virgo — V 11.9 — Finest NGC — Tropical Spring
Thu, May 15, 2025	27	Acrux (α1 Cru) — V 1 — Southern Spring α2 Cru — V 2 — Southern Spring Crux center — Constellation — V 1.4 — Southern Spring M49, elliptical galaxy in Virgo — V 8.4 — Tropical Spring M86, lenticular galaxy in Virgo — V 8.9 — Tropical Spring C21, NGC 4449, irregular galaxy in Canes Venatici — V 9.4 — Finest NGC — Northern Spring NGC 4414, galaxy in Coma Berenices — V 11 — Finest NGC — Northern Spring NGC 4438, The Eyes with 4435, galaxy in Virgo — V 10.9 — Finest NGC — Tropical Spring
Fri, May 16, 2025	28	Chara (β CVn) — V 4 — Northern Spring Gacrux (γ Cru) — V 2 — Southern Spring Musca center — Constellation — V 3.6 — Antarctic Spring Southern Cross center — Asterism — V 0.8 — Southern Spring M87, elliptical galaxy in Virgo — V 8.6 — Tropical Spring M88, spiral galaxy in Coma Berenices — V 9.6 — Tropical Spring NGC 4490, Cocoon Galaxy, galaxy in Canes Venatici — V 9.8 — Finest NGC — Northern Spring NGC 4494, galaxy in Coma Berenices — V 10.7 — Finest NGC — Northern Spring NGC 4517, often mislabeled NGC 4437, galaxy in Virgo — V 11.1 — Finest NGC — Tropical Spring NGC 4526, galaxy in Virgo — V 10.6 — Finest NGC — Tropical Spring
Sat, May 17, 2025	29	Kraz (β Crv) — V 3 — Tropical Spring α Mus — V 3 — Antarctic Spring M58, barred spiral galaxy in Virgo — V 9.7 — Tropical Spring M89, elliptical galaxy in Virgo — V 9.8 — Tropical Spring M90, spiral galaxy in Virgo — V 9.5 — Tropical Spring M91, barred spiral galaxy in Coma Berenices — V 10.2 — Tropical Spring C36, NGC 4559, spiral galaxy in Coma Berenices — V 9.8 — Finest NGC — Northern Spring C38, NGC 4565, Needle Galaxy, spiral galaxy in Coma Berenices — V 9.6 — Finest NGC — Northern Spring NGC 4535, Lost Galaxy, galaxy in Virgo — V 10.5 — Finest NGC — Tropical Spring NGC 4567, Siamese Twins, galaxy in Virgo — V 12.1 — Finest NGC — Tropical Spring NGC 4568, Siamese Twins, galaxy in Virgo — V 11.7 — Finest NGC — Tropical Spring
Sun, May 18, 2025	30	γ Cen — V 2 — Southern Spring M59, elliptical galaxy in Virgo — V 9.6 — Tropical Spring M68, globular cluster in Hydra — V 7.8 — Southern Spring M104, Sombrero Galaxy, spiral galaxy in Virgo — V 8.0 — Tropical Spring C32, NGC 4631, Whale Galaxy, spiral galaxy in Canes Venatici — V 9.3 — Finest NGC — Northern Spring NGC 4605, galaxy in Ursa Major — V 10.8 — Finest NGC — Northern Spring

Weekly Solar-System Ephemeris

Snapshot: May 12, 2025 · 00:00 UTC

Notation:

Naked Eye

☉︎ Sun	☽︎ Moon	☿︎ Mercury	♀︎ Venus	♂︎ Mars	♃︎ Jupiter	♄︎ Saturn
♉︎ 21°32′ β −0°00′	♏︎ 13°49′ β −3°46′	♉︎ 2°32′ β −2°16′	♈︎ 7°29′ β −0°27′	♌︎ 10°49′ β +1°47′	♊︎ 23°38′ β −0°13′	♓︎ 28°54′ β −2°02′
Observing
☉		☉

Extended targets:

⚳︎ Ceres	♅︎ Uranus	♆︎ Neptune	♇︎ Pluto
♓︎ 28°27′ β −9°00′	♉︎ 26°57′ β −0°13′	♈︎ 1°25′ β −1°17′	♒︎ 3°48′ β −3°35′
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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