ISO week 20 2027

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

Week begins: Monday, May 17, 2027

Notation:

Calendar

Date	Zodiac day	Events
Mon, May 17, 2027	28	Chara (β CVn) — V 4 — Northern Spring Kraz (β Crv) — V 3 — Tropical Spring Musca center — Constellation — V 3.6 — Antarctic Spring M89, elliptical galaxy in Virgo — V 9.8 — 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 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 NGC 4535, Lost Galaxy, galaxy in Virgo — V 10.5 — Finest NGC — Tropical Spring
Tue, May 18, 2027	29	α Mus — V 3 — Antarctic Spring M58, barred spiral galaxy in Virgo — V 9.7 — Tropical Spring M68, globular cluster in Hydra — V 7.8 — Southern Spring M90, spiral galaxy in Virgo — V 9.5 — Tropical Spring M104, Sombrero Galaxy, spiral galaxy in Virgo — V 8.0 — Tropical Spring C38, NGC 4565, Needle Galaxy, spiral galaxy in Coma Berenices — V 9.6 — Finest NGC — Northern Spring NGC 4605, galaxy in Ursa Major — V 10.8 — Finest NGC — Northern 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
Wed, May 19, 2027	30	γ Cen — V 2 — Southern Spring M59, elliptical galaxy in Virgo — V 9.6 — Tropical Spring M60, elliptical galaxy in Virgo — V 8.8 — Tropical Spring C32, NGC 4631, Whale Galaxy, spiral galaxy in Canes Venatici — V 9.3 — Finest NGC — Northern Spring C98, NGC 4609, open cluster in Crux — V 6.9 — Southern Spring NGC 4656, Hockey Stick or Crowbar, galaxy in Canes Venatici — V 9.7 — Finest NGC — Northern Spring
Thu, May 20, 2027	31	🌕 Full Moon · Blue Moon — 10:59:02 UTC Mimosa (β Cru) — V 1 — Southern Spring β Mus — V 3 — Antarctic Spring Coma Berenices center — Constellation — V 4.3 — Tropical Spring
Fri, May 21, 2027	1	Sun enters Gemini — 06:18:14 UTC M94, spiral galaxy in Canes Venatici — V 8.2 — Northern Spring C52, NGC 4697, elliptical galaxy in Virgo — V 9.3 — Tropical Spring NGC 4725, galaxy in Coma Berenices — V 9.9 — Finest NGC — Northern Spring NGC 4699, galaxy in Virgo — V 10.4 — Finest NGC — Tropical Spring
Sat, May 22, 2027	2	α1 CVn — V 6 — Northern Spring Cor Caroli (α2 CVn) — V 3 — Northern Spring Alioth (ε UMa) — V 2 — Northern Spring C94, NGC 4755, Jewel Box Cluster, open cluster in Crux — V 4.2 — Southern Spring C99, Coalsack, Coalsack Nebula, dark nebula in Crux — Southern Spring NGC 4762, galaxy in Virgo — V 11.1 — Finest NGC — Tropical Spring
Sun, May 23, 2027	3	M64, Black Eye Galaxy, spiral galaxy in Coma Berenices — V 8.5 — Tropical Spring C35, NGC 4889, elliptical galaxy in Coma Berenices — V 11.4 — Northern Spring C105, NGC 4833, globular cluster in Musca — V 7.3 — Antarctic Spring

Weekly Solar-System Ephemeris

Snapshot: May 17, 2027 · 00:00 UTC

Notation:

Naked Eye

☉︎ Sun	☽︎ Moon	☿︎ Mercury	♀︎ Venus	♂︎ Mars	♃︎ Jupiter	♄︎ Saturn
♉︎ 25°54′ β −0°00′	♎︎ 14°15′ β −4°19′	♊︎ 14°39′ β +2°15′	♉︎ 2°35′ β −1°34′	♍︎ 0°54′ β +1°39′	♌︎ 18°42′ β +0°58′	♈︎ 22°27′ β −2°17′
Observing
☉		☉

Extended targets:

⚳︎ Ceres	♅︎ Uranus	♆︎ Neptune	♇︎ Pluto
♋︎ 28°14′ β +8°05′	♊︎ 5°10′ β −0°07′	♈︎ 5°54′ β −1°22′	♒︎ 7°10′ β −4°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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