ISO 2025-W40
Week begins: Monday, September 29, 2025
Calendar
| Date | Zodiac day | Events |
|---|---|---|
| Mon, Sep 29, 2025 | ♎ 8 | 🌓 First Quarter — 23:53:50 UTC β Equ —  5 5.2 — Tropical Autumn |
| Tue, Sep 30, 2025 | ♎ 9 | |
| Wed, Oct 1, 2025 | ♎ 10 | Alfirk (β Cep) —  3 3.2 — Arctic AutumnM15 —  6 6.2 — Tropical Autumn |
| Thu, Oct 2, 2025 | ♎ 11 | Sadalsuud (β Aqr) — 3 2.9 — Tropical AutumnM39 — 5 4.6 — Northern AutumnM2 — 7 6.5 — Tropical Autumn |
| Fri, Oct 3, 2025 | ♎ 12 | |
| Sat, Oct 4, 2025 | ♎ 13 | M30 — 7 7.2 — Tropical Autumn |
| Sun, Oct 5, 2025 | ♎ 14 | Finest NGC 109 / NGC 7129 · Small Cluster Nebula — 12 11.5 — Northern AutumnHerschel's Garnet Star (μ Cephei) — — Northern AutumnEnif (ε Peg) — Var 2 2.4 0.7–3.5 — Tropical Autumn |
Weekly Solar-System Ephemeris
Snapshot: Week begins September 29, 2025, 00:00 UTC.
(-90° to +90°; defaults +45°, 21:00 LAT)
| Body | ☉︎ | ☽︎ | ☿︎ | ♀︎ | ♂︎ | ♃︎ | ♄︎ |
|---|---|---|---|---|---|---|---|
| Ecliptic | ♎︎ 6°07′ β −0°00′ | ♐︎ 25°01′ β −5°13′ | ♎︎ 17°59′ β +0°08′ | ♍︎ 11°37′ β +1°14′ | ♏︎ 4°30′ β −0°03′ | ♋︎ 22°13′ β +0°01′ | ♓︎ 27°55′ β −2°31′ |
| Observing |  | -9.6 | ☉︎ | -3.9 | 1.6 | -2.1 | 0.6 |
| Rise | 06:04 | 13:22 | 07:08 | 03:54 | 08:36 | 23:36 | 17:44 |
| Set | 17:56 | 21:07 | 18:20 | 17:09 | 18:57 | 14:51 | 05:24 |
Extended targets:
| Body | ⚳︎ | ♅︎ | ♆︎ | ♇︎ |
|---|---|---|---|---|
| Ecliptic | ♈︎ 10°25′ β −15°10′ | ♊︎ 1°15′ β −0°13′ | ♈︎ 0°36′ β −1°22′ | ♒︎ 1°25′ β −3°47′ |
| Observing | 7.6 | 5.7 | 7.7 | 14.5 |
| Rise | 19:17 | 20:04 | 17:43 | 15:35 |
| Set | 06:03 | 11:04 | 05:41 | 00:16 |
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 17:02:11 UTC
ISO 2025-W40 runs from September 29 through October 5. Saturn and Neptune are separated by about 2.7° in geocentric ecliptic longitude at the Monday 00:00 UTC snapshot.
Naked eye: 🌓 First Quarter — 23:53:50 UTC. Moderate moonlight makes timing and local sky position important for faint targets. Use Alfirk, Sadalsuud, Enif as the week’s fixed-sky framework.
Planets: Moon: Naked eye; magnitude -9.6; direct motion; 40.5% illuminated. Monday 00:00 UTC snapshot. Conjunction with Pluto in ecliptic longitude Oct 01 22:29 UTC. Mercury: In solar glare; magnitude -0.6; direct motion; 94.4% illuminated. Monday 00:00 UTC snapshot. Venus: Naked eye; magnitude -3.9; direct motion; 90.8% illuminated. Below the horizon at 21:00 local apparent solar time, 45°N. Monday 00:00 UTC snapshot. Mars: Naked eye; magnitude 1.6; direct motion; 97.6% illuminated. Below the horizon at 21:00 local apparent solar time, 45°N. Monday 00:00 UTC snapshot. Ceres: Telescope; magnitude 7.6; retrograde motion; 99.8% illuminated. Monday 00:00 UTC snapshot. Opposition in ecliptic longitude Oct 02 13:16 UTC. Jupiter: Naked eye; magnitude -2.1; direct motion; 99.1% illuminated. Below the horizon at 21:00 local apparent solar time, 45°N. Monday 00:00 UTC snapshot. Saturn: Naked eye; magnitude 0.6; retrograde motion; 100.0% illuminated. Monday 00:00 UTC snapshot. Uranus: Binoculars; magnitude 5.7; retrograde motion; 100.0% illuminated. Monday 00:00 UTC snapshot. Neptune: Telescope; magnitude 7.7; retrograde motion; 100.0% illuminated. Monday 00:00 UTC snapshot. Pluto: Substantial telescope; magnitude 14.5; retrograde motion; 100.0% illuminated. Monday 00:00 UTC snapshot. Conjunction with Moon in ecliptic longitude Oct 01 22:29 UTC.
Binoculars: Trace Equuleus’s charted figure in the finder, then identify β Equ at its charted position.
Small telescope: Great Pegasus Globular: consult its dedicated finder and observing story for equipment guidance; M39: consult its dedicated finder and observing story for equipment guidance; M2: consult its dedicated finder and observing story for equipment guidance; M30: consult its dedicated finder and observing story for equipment guidance; Small Cluster Nebula: 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: None
Mercury
Mercury: in solar glare at the Monday 00:00 UTC snapshot. Rises 07:08; sets 18:20 (45°N, local apparent solar time). Visual magnitude -0.6. The disk is 94.4% illuminated (gibbous). It is 11.9° from the Sun, on its east side. Motion is direct at 1.617° per day in ecliptic longitude at the snapshot. Position reference: Spica, 6.6° away. Mercury: 6.6° from Spica 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 32.7° below the horizon. Rises 03:54; sets 17:09 (45°N, local apparent solar time). Visual magnitude -3.9. The disk is 90.8% illuminated (gibbous). It is 24.5° from the Sun, on its west side. Motion is direct at 1.230° per day in ecliptic longitude at the snapshot. Position reference: Regulus, 11.4° away. Venus: 11.4° from Regulus 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 0.4° above the horizon. Rises 13:22; sets 21:07 (45°N, local apparent solar time). Visual magnitude -9.6. The disk is 40.5% illuminated (waxing crescent). It is 78.9° from the Sun, on its east side. Motion is direct at 12.037° per day in ecliptic longitude at the snapshot. Position reference: Shaula, 8.6° away. Conjunction with Pluto in ecliptic longitude Oct 01 22:29 UTC. Moon: 8.6° from Shaula 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 22.1° below the horizon. Rises 08:36; sets 18:57 (45°N, local apparent solar time). Visual magnitude 1.6. The disk is 97.6% illuminated (gibbous). It is 28.4° from the Sun, on its east side. Motion is direct at 0.679° per day in ecliptic longitude at the snapshot. Position reference: Spica, 10.5° away. Mars: 10.5° from Spica 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 19.0° below the horizon. Rises 23:36; sets 14:51 (45°N, local apparent solar time). Visual magnitude -2.1. The disk is 99.1% illuminated (nearly full). It is 73.9° from the Sun, on its west side. Motion is direct at 0.127° per day in ecliptic longitude at the snapshot. Position reference: Pollux, 6.8° away. Jupiter: 6.8° from Pollux 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 30.8° above the horizon. Rises 17:44; sets 05:24 (45°N, local apparent solar time). Visual magnitude 0.6. The disk is 100.0% illuminated (nearly full). It is 171.4° from the Sun, on its east side. Motion is retrograde at 0.076° per day in ecliptic longitude at the snapshot. Position reference: Fumalsamakah, 14.6° away. Neptune is 2.9° away at the snapshot. Saturn: 14.6° from Fumalsamakah in the Pathfinder.
Uranus
Uranus: binoculars at the Monday 00:00 UTC snapshot. At 45°N and 21:00 local apparent solar time, it is 8.3° above the horizon. Rises 20:04; sets 11:04 (45°N, local apparent solar time). Visual magnitude 5.7. The disk is 100.0% illuminated (nearly full). It is 124.9° from the Sun, on its west side. Motion is retrograde at 0.019° per day in ecliptic longitude at the snapshot. Position reference: Aldebaran, 10.3° away. Uranus: 10.3° 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 31.6° above the horizon. Rises 17:43; sets 05:41 (45°N, local apparent solar time). Visual magnitude 7.7. The disk is 100.0% illuminated (nearly full). It is 174.3° from the Sun, on its east side. Motion is retrograde at 0.028° per day in ecliptic longitude at the snapshot. Position reference: Fumalsamakah, 15.6° away. Saturn is 2.9° away at the snapshot. Neptune: 15.6° 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 16.1° above the horizon. Rises 19:17; sets 06:03 (45°N, local apparent solar time). Visual magnitude 7.6. The disk is 99.8% illuminated (nearly full). It is 164.2° from the Sun, on its west side. Motion is retrograde at 0.225° per day in ecliptic longitude at the snapshot. Position reference: Diphda, 9.0° away. Opposition in ecliptic longitude Oct 02 13:16 UTC. Ceres: 9.0° 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 19.8° above the horizon. Rises 15:35; sets 00:16 (45°N, local apparent solar time). Visual magnitude 14.5. The disk is 100.0% illuminated (nearly full). It is 115.2° from the Sun, on its east side. Motion is retrograde at 0.007° per day in ecliptic longitude at the snapshot. Position reference: Dabih, 8.9° away. Conjunction with Moon in ecliptic longitude Oct 01 22:29 UTC. Pluto: 8.9° from Dabih in the Pathfinder.
Highlights
Mercury
In solar glare; magnitude -0.6; direct motion; 94.4% illuminated. Monday 00:00 UTC snapshot. Mercury: 6.6° from Spica in the Pathfinder.
Venus
Naked eye; magnitude -3.9; direct motion; 90.8% illuminated. Below the horizon at 21:00 local apparent solar time, 45°N. Monday 00:00 UTC snapshot. Venus: 11.4° from Regulus in the Pathfinder.
Moon
Naked eye; magnitude -9.6; direct motion; 40.5% illuminated. Monday 00:00 UTC snapshot. Conjunction with Pluto in ecliptic longitude Oct 01 22:29 UTC. Moon: 8.6° from Shaula in the Pathfinder.
Mars
Naked eye; magnitude 1.6; direct motion; 97.6% illuminated. Below the horizon at 21:00 local apparent solar time, 45°N. Monday 00:00 UTC snapshot. Mars: 10.5° from Spica in the Pathfinder.
Jupiter
Naked eye; magnitude -2.1; direct motion; 99.1% illuminated. Below the horizon at 21:00 local apparent solar time, 45°N. Monday 00:00 UTC snapshot. Jupiter: 6.8° from Pollux in the Pathfinder.
Saturn
Naked eye; magnitude 0.6; retrograde motion; 100.0% illuminated. Monday 00:00 UTC snapshot. Saturn: 14.6° from Fumalsamakah in the Pathfinder.
Uranus
Binoculars; magnitude 5.7; retrograde motion; 100.0% illuminated. Monday 00:00 UTC snapshot. Uranus: 10.3° from Aldebaran in the Pathfinder.
Neptune
Telescope; magnitude 7.7; retrograde motion; 100.0% illuminated. Monday 00:00 UTC snapshot. Neptune: 15.6° from Fumalsamakah in the Pathfinder.
Ceres
Telescope; magnitude 7.6; retrograde motion; 99.8% illuminated. Monday 00:00 UTC snapshot. Opposition in ecliptic longitude Oct 02 13:16 UTC. Ceres: 9.0° from Diphda in the Pathfinder.
Pluto
Substantial telescope; magnitude 14.5; retrograde motion; 100.0% illuminated. Monday 00:00 UTC snapshot. Conjunction with Moon in ecliptic longitude Oct 01 22:29 UTC. Pluto: 8.9° from Dabih in the Pathfinder.