Star Almanack
Alexander Ferrari Miller

ISO 2027-W37

Week begins: Monday, September 13, 2027

Notation:

Calendar

DateZodiac dayEvents
Mon, Sep 13, 2027♍ 22
Sadr (γ Cyg) — Naked eye 2 — Northern Summer
M29 — Telescope 7 — Northern Summer
Tue, Sep 14, 2027♍ 23
Peacock (α Pav) — Naked eye 2 — Southern Summer
Wed, Sep 15, 2027♍ 24
🌕 Full Moon · Harvest Moon — 23:03:31 UTC
Finest NGC 107 / NGC 6939 · Collinder 423 — Telescope 10 — Northern Summer
Thu, Sep 16, 2027♍ 25
C47 / NGC 6934 — Telescope 9 — Tropical Summer
Finest NGC 106 / NGC 6940 · Collinder 424 — Telescope 7 — Northern Summer
C12 / NGC 6946 / Finest NGC 108 / NGC 6946 · Fireworks Galaxy; Arp 29 — Telescope 10 — Northern Summer
Fri, Sep 17, 2027♍ 26
Rotanev (β Del) — Binoculars 4 — Tropical Summer
α Ind — Naked eye 3 — Southern Summer
Sat, Sep 18, 2027♍ 27
Sualocin (α Del) — Binoculars 4 — Tropical Summer
Deneb (α Cyg) / Deneb (α Cygni) — Naked eye 1 — Northern Summer — in the Milky Way
Sun, Sep 19, 2027♍ 28
β Pav — Naked eye 3 — Southern Summer
C34 / NGC 6960 · Western Veil Nebula / Finest NGC 99b / NGC 6960 · Veil Nebula (West) — Telescope — Northern Summer
Aljanah (ε Cyg) — Naked eye 2 — Northern Summer

Weekly Solar-System Ephemeris

Snapshot: Week begins September 13, 2027, 00:00 UTC.

(-90° to +90°; defaults +45°, 21:00 LAT)

Notation:
Body☉︎☽︎☿︎♀︎♂︎♃︎♄︎
Ecliptic♍︎ 20°00′
β +0°00′		♒︎ 17°18′
β +0°34′		♎︎ 13°46′
β −1°14′		♍︎ 28°44′
β +1°19′		♏︎ 7°13′
β −0°24′		♍︎ 10°27′
β +0°56′		♈︎ 26°54′
β −2°44′
ObservingNightNaked eye -11.7Naked eye -0.0☉︎Naked eye 1.4☉︎Naked eye 0.3
Rise05:3916:5507:4806:2409:5104:4819:46
Set18:2102:5519:0318:4520:0118:0408:55

Extended targets:

Body⚳︎♅︎♆︎♇︎
Ecliptic♍︎ 19°35′
β +7°36′		♊︎ 9°57′
β −0°06′		♈︎ 5°40′
β −1°28′		♒︎ 5°01′
β −4°48′
Observing☉︎Binoculars 5.7Telescope 7.7TelescopeTelescope 14.5
Rise05:2121:3218:5416:52
Set19:0012:4807:0601:31

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.

Notation:

Planet Finder

Planet Finder — Greek / Symbols
Greek / Symbols
Planet Finder — English
English
Planet Finder — Mixed Learner
Mixed Learner

Sky Notes

Kilroy: Sky Notes · generated 2026-10-22 20:05:49 UTC

View:

ISO 2027-W37 runs from September 13 through September 19. Uranus is about 0.2° in ecliptic longitude from Aldebaran in Taurus.

Naked eye: 🌕 Full Moon · Harvest Moon — 23:03:31 UTC. Bright moonlight favors prominent stars and planets while reducing contrast on faint deep-sky objects. Use Sadr, Peacock, α Ind, Deneb, β Pav, Aljanah as the week’s fixed-sky framework.

The star in the middle of the Northern Cross — Sadr sits at the intersection of the Northern Cross, making it one of the most useful landmarks in the rich star fields of Cygnus.

The Peacock Star: A Bright Beacon in the Constellation Perseus — An in-depth look at the prominent star Alpha Pavonis, its astronomical significance, and its place in the southern sky.

Alpha Ind: The Brightest Beacon in Indus — A luminous star guiding astronomers and stargazers alike, Alpha Ind holds a prominent place in its constellation.

The bright star that should not look this bright — Deneb looks comparable to Vega and Altair in the Summer Triangle, but it is vastly farther away and therefore enormously more luminous.

Beta Pav: A Shining Beacon in the Pav Constellation — An overview of Beta Pav, its celestial characteristics, and its place in the night sky.

Aljanah: A Bright Beacon in the Northern Sky — An exploration of Aljanah, a prominent star nestled near the Northern Cross, whose steady glow has guided astronomers and stargazers alike.

Planets: Moon: Naked eye; magnitude -11.7; direct motion; 92.1% illuminated. Monday 00:00 UTC snapshot. Opposition in ecliptic longitude Sep 15 23:03 UTC. Conjunction with Saturn in ecliptic longitude Sep 18 15:40 UTC. Conjunction with Neptune in ecliptic longitude Sep 16 23:41 UTC. Mercury: Naked eye; magnitude -0.0; direct motion; 74.6% illuminated. Below the horizon at 21:00 local apparent solar time, 45°N. Monday 00:00 UTC snapshot. Venus: In solar glare; magnitude -3.9; direct motion; 98.8% illuminated. Monday 00:00 UTC snapshot. Mars: Naked eye; magnitude 1.4; direct motion; 93.6% illuminated. Below the horizon at 21:00 local apparent solar time, 45°N. Monday 00:00 UTC snapshot. Ceres: In solar glare; magnitude 8.4; direct motion; 99.9% illuminated. Monday 00:00 UTC snapshot. Jupiter: In solar glare; magnitude -1.7; direct motion; 100.0% illuminated. Monday 00:00 UTC snapshot. Saturn: Naked eye; magnitude 0.3; retrograde motion; 99.9% illuminated. Monday 00:00 UTC snapshot. Conjunction with Moon in ecliptic longitude Sep 18 15:40 UTC. Uranus: Binoculars; magnitude 5.7; direct motion; 99.9% illuminated. Below the horizon at 21:00 local apparent solar time, 45°N. Monday 00:00 UTC snapshot. Station Sep 15 09:09 UTC: turns retrograde. Neptune: Telescope; magnitude 7.7; retrograde motion; 100.0% illuminated. Monday 00:00 UTC snapshot. Conjunction with Moon in ecliptic longitude Sep 16 23:41 UTC. Pluto: Substantial telescope; magnitude 14.5; retrograde motion; 100.0% illuminated. Monday 00:00 UTC snapshot.

Binoculars: Trace Delphinus’s charted figure in the finder, then identify Rotanev at its charted position. Trace Delphinus’s charted figure in the finder, then identify Sualocin at its charted position.

Rotanev: The Guardian Star of Delphinus — An exploration of the star commonly known as Rotanev, its celestial context, and its significance within the constellation Delphinus.

Sualocin: A Bright Beacon in Delphinus — Discover the characteristics and significance of this notable star, also known as Alpha Delphini.

Small telescope: M29: consult its dedicated finder and observing story for equipment guidance; Collinder 423: consult its dedicated finder and observing story for equipment guidance; NGC 6934: consult its dedicated finder and observing story for equipment guidance; Collinder 424: consult its dedicated finder and observing story for equipment guidance; Fireworks Galaxy; Arp 29: consult its dedicated finder and observing story for equipment guidance; Western Veil Nebula: consult its dedicated finder and observing story for equipment guidance

A small cluster in a crowded city — M29 is easy to underestimate because it sits in one of the richest stellar neighborhoods in the northern Milky Way.

Collinder 423: A Prominent Open Cluster in Cepheus — An overview of this intriguing stellar grouping, its characteristics, and observational significance.

Delphini Star Cluster: A Globular Jewel of the Constellation Delphinus — An enduring target for observers, this globular cluster offers insight into ancient stellar populations.

Collinder 424: A Bright Open Cluster in Vulpecula — Discover the characteristics and significance of this intriguing stellar grouping.

The Fireworks Galaxy: A Stellar Spectacle in Cygnus — An exploration of the intriguing galaxy also known as Arp 29, situated in the constellation Cygnus.

The Western Veil Nebula: A Glimpse into a Supernova's Remnant — An enduring emblem of cosmic cataclysm, exploring the Western Veil Nebula in Cygnus.

Substantial telescope: No fixed-sky Calendar object is classified as requiring a substantial telescope this week.

Other objects listed this week: None

Mercury

Mercury: naked eye at the Monday 00:00 UTC snapshot. At 45°N and 21:00 local apparent solar time, it is 21.1° below the horizon. Rises 07:48; sets 19:03 (45°N, local apparent solar time). Visual magnitude -0.0. The disk is 74.6% illuminated (gibbous). It is 23.8° from the Sun, on its east side. Motion is direct at 1.341° per day in ecliptic longitude at the snapshot. Position reference: Spica, 10.5° away. Mercury: 10.5° from Spica in the Pathfinder.

Venus

Venus: in solar glare at the Monday 00:00 UTC snapshot. Rises 06:24; sets 18:45 (45°N, local apparent solar time). Visual magnitude -3.9. The disk is 98.8% illuminated (gibbous). It is 8.8° from the Sun, on its east side. Motion is direct at 1.241° per day in ecliptic longitude at the snapshot. Position reference: Zavijava, 1.3° away. Venus: 1.3° from Zavijava 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 28.5° above the horizon. Rises 16:55; sets 02:55 (45°N, local apparent solar time). Visual magnitude -11.7. The disk is 92.1% illuminated (waxing gibbous). It is 147.3° from the Sun, on its east side. Motion is direct at 11.839° per day in ecliptic longitude at the snapshot. Position reference: Sadalsuud, 10.3° away. Opposition in ecliptic longitude Sep 15 23:03 UTC. Conjunction with Saturn in ecliptic longitude Sep 18 15:40 UTC. Conjunction with Neptune in ecliptic longitude Sep 16 23:41 UTC. Moon: 10.3° from Sadalsuud 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 10.7° below the horizon. Rises 09:51; sets 20:01 (45°N, local apparent solar time). Visual magnitude 1.4. The disk is 93.6% illuminated (gibbous). It is 47.2° from the Sun, on its east side. Motion is direct at 0.669° per day in ecliptic longitude at the snapshot. Position reference: Zubenelgenubi, 8.3° away. Mars: 8.3° from Zubenelgenubi in the Pathfinder.

Jupiter

Jupiter: in solar glare at the Monday 00:00 UTC snapshot. Rises 04:48; sets 18:04 (45°N, local apparent solar time). Visual magnitude -1.7. The disk is 100.0% illuminated (nearly full). It is 9.6° from the Sun, on its west side. Motion is direct at 0.216° per day in ecliptic longitude at the snapshot. Position reference: Regulus, 10.2° away. Jupiter: 10.2° from Regulus 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 12.4° above the horizon. Rises 19:46; sets 08:55 (45°N, local apparent solar time). Visual magnitude 0.3. The disk is 99.9% illuminated (nearly full). It is 143.0° from the Sun, on its west side. Motion is retrograde at 0.055° per day in ecliptic longitude at the snapshot. Position reference: Alrescha, 6.9° away. Conjunction with Moon in ecliptic longitude Sep 18 15:40 UTC. Saturn: 6.9° from Alrescha 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 5.2° below the horizon. Rises 21:32; sets 12:48 (45°N, local apparent solar time). Visual magnitude 5.7. The disk is 99.9% illuminated (nearly full). It is 100.0° from the Sun, on its west side. Motion is direct at 0.002° per day in ecliptic longitude at the snapshot. Position reference: Aldebaran, 5.4° away. Station Sep 15 09:09 UTC: turns retrograde. Uranus: 5.4° 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 21.3° above the horizon. Rises 18:54; sets 07:06 (45°N, local apparent solar time). Visual magnitude 7.7. The disk is 100.0% illuminated (nearly full). It is 164.3° from the Sun, on its west side. Motion is retrograde at 0.026° per day in ecliptic longitude at the snapshot. Position reference: Diphda, 19.5° away. Conjunction with Moon in ecliptic longitude Sep 16 23:41 UTC. Neptune: 19.5° from Diphda in the Pathfinder.

Ceres

Ceres: in solar glare at the Monday 00:00 UTC snapshot. Rises 05:21; sets 19:00 (45°N, local apparent solar time). Visual magnitude 8.4. The disk is 99.9% illuminated (nearly full). It is 7.6° from the Sun, on its west side. Motion is direct at 0.460° per day in ecliptic longitude at the snapshot. Position reference: Denebola, 5.2° away. Ceres: 5.2° from Denebola 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 21.2° above the horizon. Rises 16:52; sets 01:31 (45°N, local apparent solar time). Visual magnitude 14.5. The disk is 100.0% illuminated (nearly full). It is 134.8° from the Sun, on its east side. Motion is retrograde at 0.015° per day in ecliptic longitude at the snapshot. Position reference: Dabih, 9.4° away. Pluto: 9.4° from Dabih in the Pathfinder.