ISO 2025-W20
Week begins: Monday, May 12, 2025
Calendar
| Date | Zodiac day | Events |
|---|---|---|
| Mon, May 12, 2025 | ♉ 24 | 🌕 Full Moon · Milk Moon — 16:55:56 UTC Finest NGC 60 / NGC 4214 · MCG 6-27-42 —  10 10.2 — Northern SpringFinest NGC 76 / NGC 4216 · MCG 2-31-72 — 11 11.0 — Tropical SpringC3 / NGC 4236 — 10 9.7 — Arctic SpringFinest NGC 61 / NGC 4244 · Silver Needle / C26 / NGC 4244 — 10 10.4 — Northern Springβ Cha —  4 4.2 — Antarctic Spring |
| Tue, May 13, 2025 | ♉ 25 | M99 — 10 9.9 — Tropical SpringM106 — 8 8.4 — Northern SpringFinest NGC 68 / NGC 4274 · MCG 5-29-60 — 11 11.3 — Northern SpringM61 — 10 9.7 — Tropical SpringM40 — 8 8.4 — Northern Spring |
| Wed, May 14, 2025 | ♉ 26 | M100 — 9 9.3 — Tropical SpringFinest NGC 75 / NGC 4361 — 11 10.9 — Tropical SpringM84 — 9 9.1 — Tropical SpringM85 — 9 9.1 — Tropical SpringFinest NGC 77 / NGC 4388 · MCG 2-32-41 — 12 11.9 — Tropical SpringC108 / NGC 4372 — 8 7.8 — Antarctic SpringM86 — 9 8.9 — Tropical Spring |
| Thu, May 15, 2025 | ♉ 27 | Finest NGC 69 / NGC 4414 · MCG 5-29-85 — 11 11.0 — Northern SpringAcrux (α1 Cru) —  1 1.3 — Southern Springα2 Cru — 2 1.6 — Southern SpringFinest NGC 78 / NGC 4438 · The Eyes with 4435 — 11 10.9 — Tropical SpringFinest NGC 62 / NGC 4449 · MCG 7-26-9 / C21 / NGC 4449 — 10 9.5 — Northern SpringM49 — 8 8.4 — Tropical Spring |
| Fri, May 16, 2025 | ♉ 28 | Finest NGC 63 / NGC 4490 · Cocoon Galaxy — 10 9.8 — Northern SpringM87 — 9 8.6 — Tropical SpringGacrux (γ Cru) — 2 1.6 — Southern SpringFinest NGC 70 / NGC 4494 · MCG 4-30-2 — 11 10.7 — Northern SpringM88 — 10 9.6 — Tropical SpringFinest NGC 79 / NGC 4517 · often mislabeled NGC 4437 — 11 11.1 — Tropical SpringChara (β CVn) — 4 4.2 — Northern SpringFinest NGC 80 / NGC 4526 · MCG 1-32-100 — 11 10.6 — Tropical Spring |
| Sat, May 17, 2025 | ♉ 29 | Finest NGC 81 / NGC 4535 · Lost Galaxy — 11 10.5 — Tropical SpringKraz (β Crv) — 3 2.7 — Tropical SpringM91 — 10 10.2 — Tropical SpringM89 — 10 9.8 — Tropical SpringFinest NGC 71 / NGC 4559 · MCG 5-30-30 / C36 / NGC 4559 — 10 10.3 — Northern SpringC38 / NGC 4565 · Needle Galaxy / Finest NGC 72 / NGC 4565 · Needle Galaxy — 10 9.6 — Northern SpringFinest NGC 82a / NGC 4567 · Siamese Twins — 12 12.1 — Tropical SpringFinest NGC 82b / NGC 4568 · Siamese Twins — 12 11.7 — Tropical SpringM90 — 10 9.5 — Tropical Springα Mus — 3 2.7 — Antarctic SpringM58 — 10 9.7 — Tropical Spring |
| Sun, May 18, 2025 | ♉ 30 | M68 — 8 7.8 — Southern SpringFinest NGC 48 / NGC 4605 · MCG 10-18-74 — 11 10.8 — Northern SpringM104 — 8 8.0 — Tropical Springγ Cen — 2 2.2 — Southern SpringM59 — 10 9.6 — Tropical SpringC32 / NGC 4631 · Whale Galaxy / Finest NGC 64 / NGC 4631 · Whale Galaxy — 9 9.3 — Northern Spring |
Weekly Solar-System Ephemeris
Snapshot: Week begins May 12, 2025, 00:00 UTC.
(-90° to +90°; defaults +45°, 21:00 LAT)
| Body | ☉︎ | ☽︎ | ☿︎ | ♀︎ | ♂︎ | ♃︎ | ♄︎ |
|---|---|---|---|---|---|---|---|
| Ecliptic | ♉︎ 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 |  | -12.4 | ☉︎ | -4.6 | 1.1 | -2.0 | 1.1 |
| Rise | 04:39 | 18:43 | 04:04 | 02:59 | 10:13 | 06:31 | 02:50 |
| Set | 19:21 | 04:05 | 17:33 | 15:25 | 01:05 | 22:00 | 14:36 |
Extended targets:
| Body | ⚳︎ | ♅︎ | ♆︎ | ♇︎ |
|---|---|---|---|---|
| Ecliptic | ♓︎ 28°27′ β −9°00′ | ♉︎ 26°57′ β −0°13′ | ♈︎ 1°25′ β −1°17′ | ♒︎ 3°48′ β −3°35′ |
| Observing | 9.3 | ☉︎ | 7.8 | 14.5 |
| Rise | 03:26 | 04:57 | 02:51 | 00:48 |
| Set | 14:19 | 19:47 | 14:51 | 09:36 |
β = ecliptic latitude (+ north, − south).
Rise and set are Local Apparent Time for the selected latitude.
Naked-eye observing uses the Sun’s altitude at the selected Monday observer time: Daylight (Sun ≥ −0.833°), Civil twilight (−0.833° to −6°), Nautical twilight (−6° to −12°), Astronomical twilight (−12° to −18°), and Night (below −18°).
Solar Glare identifies a body too close to the Sun when the sky-state rule does not already supersede its naked-eye classification.
The Sun’s observing status uses this same five-state sky classification.
Planet Finder
Sky Notes
Kilroy: Sky Notes · generated 2026-10-23 09:19:03 UTC
ISO 2025-W20 runs from May 12 through May 18. Ceres and Saturn are separated by about 0.4° in geocentric ecliptic longitude at the Monday 00:00 UTC snapshot. Jupiter is about 1.1° in ecliptic longitude from Elnath in Taurus.
Naked eye: 🌕 Full Moon · Milk Moon — 16:55:56 UTC. Bright moonlight favors prominent stars and planets while reducing contrast on faint deep-sky objects. Use Acrux, Alpha2 Cru, Gacrux, Kraz, α Mus, Gamma Cen as the week’s fixed-sky framework.
Planets: Moon: Naked eye; magnitude -12.4; direct motion; 99.4% illuminated. Monday 00:00 UTC snapshot. Opposition in ecliptic longitude May 12 16:55 UTC. Conjunction with Pluto in ecliptic longitude May 18 12:33 UTC. Mercury: In solar glare; magnitude -0.5; direct motion; 76.4% illuminated. Monday 00:00 UTC snapshot. Venus: Naked eye; magnitude -4.6; direct motion; 37.2% illuminated. Below the horizon at 21:00 local apparent solar time, 45°N. Monday 00:00 UTC snapshot. Mars: Naked eye; magnitude 1.1; direct motion; 90.1% illuminated. Monday 00:00 UTC snapshot. Ceres: Telescope; magnitude 9.3; direct motion; 98.1% illuminated. Below the horizon at 21:00 local apparent solar time, 45°N. Monday 00:00 UTC snapshot. Conjunction with Saturn in ecliptic longitude May 13 21:41 UTC. Jupiter: Naked eye; magnitude -2.0; direct motion; 99.7% illuminated. Monday 00:00 UTC snapshot. Saturn: Naked eye; magnitude 1.1; direct motion; 99.8% illuminated. Below the horizon at 21:00 local apparent solar time, 45°N. Monday 00:00 UTC snapshot. Conjunction with Ceres in ecliptic longitude May 13 21:41 UTC. Uranus: In solar glare; magnitude 5.8; direct motion; 100.0% illuminated. Monday 00:00 UTC snapshot. Solar conjunction in ecliptic longitude May 17 23:32 UTC. Neptune: Telescope; magnitude 7.8; direct motion; 100.0% illuminated. Below the horizon at 21:00 local apparent solar time, 45°N. Monday 00:00 UTC snapshot. Pluto: Substantial telescope; magnitude 14.5; retrograde motion; 100.0% illuminated. Below the horizon at 21:00 local apparent solar time, 45°N. Monday 00:00 UTC snapshot. Conjunction with Moon in ecliptic longitude May 18 12:33 UTC.
Binoculars: Trace Chamaeleon’s charted figure in the finder, then identify β Cha at its charted position. Trace Canes Venatici’s charted figure in the finder, then identify Chara at its charted position.
Small telescope: MCG 6-27-42: consult its dedicated finder and observing story for equipment guidance; MCG 2-31-72: consult its dedicated finder and observing story for equipment guidance; NGC 4236: consult its dedicated finder and observing story for equipment guidance; Silver Needle: consult its dedicated finder and observing story for equipment guidance; M99: consult its dedicated finder and observing story for equipment guidance; M106: consult its dedicated finder and observing story for equipment guidance; MCG 5-29-60: consult its dedicated finder and observing story for equipment guidance; M61: consult its dedicated finder and observing story for equipment guidance; M100: consult its dedicated finder and observing story for equipment guidance; NGC 4361: consult its dedicated finder and observing story for equipment guidance; M84: consult its dedicated finder and observing story for equipment guidance; M85: consult its dedicated finder and observing story for equipment guidance; MCG 2-32-41: consult its dedicated finder and observing story for equipment guidance; NGC 4372: consult its dedicated finder and observing story for equipment guidance; M86: consult its dedicated finder and observing story for equipment guidance; MCG 5-29-85: consult its dedicated finder and observing story for equipment guidance; The Eyes with 4435: consult its dedicated finder and observing story for equipment guidance; MCG 7-26-9: consult its dedicated finder and observing story for equipment guidance; M49: consult its dedicated finder and observing story for equipment guidance; Cocoon Galaxy: consult its dedicated finder and observing story for equipment guidance; M87: consult its dedicated finder and observing story for equipment guidance; MCG 4-30-2: consult its dedicated finder and observing story for equipment guidance; M88: consult its dedicated finder and observing story for equipment guidance; often mislabeled NGC 4437: consult its dedicated finder and observing story for equipment guidance; MCG 1-32-100: consult its dedicated finder and observing story for equipment guidance; Lost Galaxy: consult its dedicated finder and observing story for equipment guidance; M91: consult its dedicated finder and observing story for equipment guidance; M89: consult its dedicated finder and observing story for equipment guidance; MCG 5-30-30: consult its dedicated finder and observing story for equipment guidance; Needle Galaxy: consult its dedicated finder and observing story for equipment guidance; Siamese Twins: consult its dedicated finder and observing story for equipment guidance; Siamese Twins: consult its dedicated finder and observing story for equipment guidance; M90: consult its dedicated finder and observing story for equipment guidance; M58: consult its dedicated finder and observing story for equipment guidance; M68: consult its dedicated finder and observing story for equipment guidance; MCG 10-18-74: consult its dedicated finder and observing story for equipment guidance; Sombrero Galaxy: consult its dedicated finder and observing story for equipment guidance; M59: consult its dedicated finder and observing story for equipment guidance; Whale Galaxy: consult its dedicated finder and observing story for equipment guidance
Substantial telescope: No fixed-sky Calendar object is classified as requiring a substantial telescope this week.
Other objects listed this week: Siamese Twins
Mercury
Mercury: in solar glare at the Monday 00:00 UTC snapshot. Rises 04:04; sets 17:33 (45°N, local apparent solar time). Visual magnitude -0.5. The disk is 76.4% illuminated (gibbous). It is 19.1° from the Sun, on its west side. Motion is direct at 1.731° per day in ecliptic longitude at the snapshot. Position reference: Alrescha, 7.3° away. Mercury: 7.3° from Alrescha in the Pathfinder.
Venus
Venus: naked eye at the Monday 00:00 UTC snapshot. At 45°N and 21:00 local apparent solar time, it is 42.5° below the horizon. Rises 02:59; sets 15:25 (45°N, local apparent solar time). Visual magnitude -4.6. The disk is 37.2% illuminated (crescent). It is 44.0° from the Sun, on its west side. Motion is direct at 0.758° per day in ecliptic longitude at the snapshot. Position reference: Fumalsamakah, 20.8° away. Venus: 20.8° from Fumalsamakah in the Pathfinder.
Moon
Moon: naked eye at the Monday 00:00 UTC snapshot. At 45°N and 21:00 local apparent solar time, it is 17.6° above the horizon. Rises 18:43; sets 04:05 (45°N, local apparent solar time). Visual magnitude -12.4. The disk is 99.4% illuminated (waxing nearly full). It is 171.4° from the Sun, on its east side. Motion is direct at 11.866° per day in ecliptic longitude at the snapshot. Position reference: Zubenelgenubi, 4.4° away. Opposition in ecliptic longitude May 12 16:55 UTC. Conjunction with Pluto in ecliptic longitude May 18 12:33 UTC. Moon: 4.4° from Zubenelgenubi in the Pathfinder.
Mars
Mars: naked eye at the Monday 00:00 UTC snapshot. At 45°N and 21:00 local apparent solar time, it is 41.3° above the horizon. Rises 10:13; sets 01:05 (45°N, local apparent solar time). Visual magnitude 1.1. The disk is 90.1% illuminated (gibbous). It is 79.3° from the Sun, on its east side. Motion is direct at 0.489° per day in ecliptic longitude at the snapshot. Position reference: Acubens, 7.6° away. Mars: 7.6° from Acubens in the Pathfinder.
Jupiter
Jupiter: naked eye at the Monday 00:00 UTC snapshot. At 45°N and 21:00 local apparent solar time, it is 8.8° above the horizon. Rises 06:31; sets 22:00 (45°N, local apparent solar time). Visual magnitude -2.0. The disk is 99.7% illuminated (nearly full). It is 32.1° from the Sun, on its east side. Motion is direct at 0.211° per day in ecliptic longitude at the snapshot. Position reference: Elnath, 5.6° away. Jupiter: 5.6° from Elnath in the Pathfinder.
Saturn
Saturn: naked eye at the Monday 00:00 UTC snapshot. At 45°N and 21:00 local apparent solar time, it is 47.3° below the horizon. Rises 02:50; sets 14:36 (45°N, local apparent solar time). Visual magnitude 1.1. The disk is 99.8% illuminated (nearly full). It is 52.7° from the Sun, on its west side. Motion is direct at 0.091° per day in ecliptic longitude at the snapshot. Position reference: Fumalsamakah, 14.9° away. Neptune is 2.6° away at the snapshot. Conjunction with Ceres in ecliptic longitude May 13 21:41 UTC. Saturn: 14.9° from Fumalsamakah in the Pathfinder.
Uranus
Uranus: in solar glare at the Monday 00:00 UTC snapshot. Rises 04:57; sets 19:47 (45°N, local apparent solar time). Visual magnitude 5.8. The disk is 100.0% illuminated (nearly full). It is 5.4° from the Sun, on its east side. Motion is direct at 0.058° per day in ecliptic longitude at the snapshot. Position reference: Aldebaran, 14.2° away. Solar conjunction in ecliptic longitude May 17 23:32 UTC. Uranus: 14.2° from Aldebaran in the Pathfinder.
Neptune
Neptune: telescope at the Monday 00:00 UTC snapshot. At 45°N and 21:00 local apparent solar time, it is 45.7° below the horizon. Rises 02:51; sets 14:51 (45°N, local apparent solar time). Visual magnitude 7.8. The disk is 100.0% illuminated (nearly full). It is 50.1° from the Sun, on its west side. Motion is direct at 0.027° per day in ecliptic longitude at the snapshot. Position reference: Fumalsamakah, 16.2° away. Saturn is 2.6° away at the snapshot. Neptune: 16.2° from Fumalsamakah in the Pathfinder.
Ceres
Ceres: telescope at the Monday 00:00 UTC snapshot. At 45°N and 21:00 local apparent solar time, it is 54.0° below the horizon. Rises 03:26; sets 14:19 (45°N, local apparent solar time). Visual magnitude 9.3. The disk is 98.1% illuminated (gibbous). It is 53.6° from the Sun, on its west side. Motion is direct at 0.329° per day in ecliptic longitude at the snapshot. Position reference: Diphda, 12.6° away. Conjunction with Saturn in ecliptic longitude May 13 21:41 UTC. Ceres: 12.6° from Diphda in the Pathfinder.
Pluto
Pluto: substantial telescope at the Monday 00:00 UTC snapshot. At 45°N and 21:00 local apparent solar time, it is 39.0° below the horizon. Rises 00:48; sets 09:36 (45°N, local apparent solar time). Visual magnitude 14.5. The disk is 100.0% illuminated (nearly full). It is 107.7° from the Sun, on its west side. Motion is retrograde at 0.003° per day in ecliptic longitude at the snapshot. Position reference: Dabih, 8.2° away. Conjunction with Moon in ecliptic longitude May 18 12:33 UTC. Pluto: 8.2° from Dabih in the Pathfinder.
Highlights
Mercury
In solar glare; magnitude -0.5; direct motion; 76.4% illuminated. Monday 00:00 UTC snapshot. Mercury: 7.3° from Alrescha in the Pathfinder.
Venus
Naked eye; magnitude -4.6; direct motion; 37.2% illuminated. Below the horizon at 21:00 local apparent solar time, 45°N. Monday 00:00 UTC snapshot. Venus: 20.8° from Fumalsamakah in the Pathfinder.
Moon
Naked eye; magnitude -12.4; direct motion; 99.4% illuminated. Monday 00:00 UTC snapshot. Opposition in ecliptic longitude May 12 16:55 UTC. Conjunction with Pluto in ecliptic longitude May 18 12:33 UTC. Moon: 4.4° from Zubenelgenubi in the Pathfinder.
Mars
Naked eye; magnitude 1.1; direct motion; 90.1% illuminated. Monday 00:00 UTC snapshot. Mars: 7.6° from Acubens in the Pathfinder.
Jupiter
Naked eye; magnitude -2.0; direct motion; 99.7% illuminated. Monday 00:00 UTC snapshot. Jupiter: 5.6° from Elnath in the Pathfinder.
Saturn
Naked eye; magnitude 1.1; direct motion; 99.8% illuminated. Below the horizon at 21:00 local apparent solar time, 45°N. Monday 00:00 UTC snapshot. Conjunction with Ceres in ecliptic longitude May 13 21:41 UTC. Saturn: 14.9° from Fumalsamakah in the Pathfinder.
Uranus
In solar glare; magnitude 5.8; direct motion; 100.0% illuminated. Monday 00:00 UTC snapshot. Solar conjunction in ecliptic longitude May 17 23:32 UTC. Uranus: 14.2° from Aldebaran in the Pathfinder.
Neptune
Telescope; magnitude 7.8; direct motion; 100.0% illuminated. Below the horizon at 21:00 local apparent solar time, 45°N. Monday 00:00 UTC snapshot. Neptune: 16.2° from Fumalsamakah in the Pathfinder.
Ceres
Telescope; magnitude 9.3; direct motion; 98.1% illuminated. Below the horizon at 21:00 local apparent solar time, 45°N. Monday 00:00 UTC snapshot. Conjunction with Saturn in ecliptic longitude May 13 21:41 UTC. Ceres: 12.6° from Diphda in the Pathfinder.
Pluto
Substantial telescope; magnitude 14.5; retrograde motion; 100.0% illuminated. Below the horizon at 21:00 local apparent solar time, 45°N. Monday 00:00 UTC snapshot. Conjunction with Moon in ecliptic longitude May 18 12:33 UTC. Pluto: 8.2° from Dabih in the Pathfinder.