OCTOBER 2025 (Northern Hemisphere)
| 2 | Dwarf planet 1 Ceres at opposition at 4h UT. Mag. 7.6. |
| 3 | Mercury 1.7° NNE of Spica at 0h UT (14° from Sun, evening sky). Mags. −0.4 and 1.0. |
| 4 | International Observe the Moon Night Join the global celebration: moon.nasa.gov/observe |
| 6 | Moon near Saturn at 1h UT (evening sky). Mag. 0.7. |
| 7 | Full Moon at 3:48 UT. |
| 8 | Comet C/2025 K1 (ATLAS) at perihelion. Mag. 9.4 (est.) • C/2025 K1 (ATLAS) (Orbit & Observations) |
| 8 | Moon at perigee (closest to Earth) at 12:50 UT (distance 359,819km; angular size 33.2′). |
| 9 | Pluto at southernmost declination (−23.5°) at 21h UT (evening sky). Mag. 14.5. |
| 10 | Moon near the Pleiades at 6h UT (morning sky). |
| 12 | Moon near M35 Cluster at 12h UT (morning sky). |
| 13 | Moon near Castor at 18h UT (morning sky). |
| 13 | Last Quarter Moon at 18:13 UT. |
| 14 | Moon near Pollux at 0h UT (morning sky). |
| 14 | Moon near Jupiter at 1h UT (morning sky). Mag. −2.2. |
| 15 | Moon near Beehive Cluster (M44) at 2h UT (morning sky). |
| 16 | Moon near Regulus at 19h UT (morning sky). |
| 19 | Moon near Venus at 19h UT (19° from Sun, morning sky). Mag. −3.9. |
| 19 | Mercury 2.0° SSW of Mars at 21h UT (22° from Sun, evening sky). Mags. −0.2 and 1.5. |
| 20 | Comet C/2025 R2 (SWAN) makes its closest approach to Earth (0.26 AU). Mag. 7.1 (est.) • C/2025 R2 (SWAN) (Wikipedia) • C/2025 R2 (SWAN) (Orbit & Observations) |
| 21 | Comet C/2025 A6 (Lemmon) makes its closest approach to Earth (0.60 AU). Mag. 3.2 (est.) • C/2025 A6 (Lemmon) (Wikipedia) • C/2025 A6 (Lemmon) (Orbit & Observations) |
| 21 | Orionid meteor shower peaks. Arises from the debris field of Comet Halley. Active from October 2 to November 7. Produces very fast (67 km/sec), generally faint meteors (10−20 per hour). Radiant located near Orion’s club asterism. • Orionids (Wikipedia) • Orionids (American Meteor Society) • 2025 Meteor Shower Calendar (PDF) (International Meteor Organization) |
| 21 | New Moon at 12:25 UT. Start of lunation 1272. |
| 23 | Moon, Mercury and Mars within 4.3° circle at 11h UT (22° from Sun, evening sky). Mags. −0.2 and 1.5. |
| 23 | Moon near Mercury at 16h UT (23° from Sun, evening sky). Mag. −0.2 |
| 24 | Moon at apogee (farthest from Earth) at 0h UT (distance 406,444km; angular size 29.4′). |
| 25 | Moon near Antares at 2h UT (evening sky). |
| 29 | First Quarter Moon at 16:21 UT. |
| 29 | Interstellar Comet 3I/ATLAS at perihelion. Mag. 11.7 (est.) • 3I/ATLAS (Wikipedia) • 3I/ATLAS (Orbit & Observations) |
| 29 | Mercury at easternmost elongation at 22h UT (23.9° from Sun, evening sky). Mag. −0.1. |
All times in Universal Time (UT).
- US Eastern Daylight Time = UT − 4 hours.
- US Pacific Daylight Time = UT − 7 hours.
- Australian Eastern Standard Time = UT + 10 hours
- Singapore Standard Time = UT + 8 hours.
More sky events and links at http://Skymaps.com/skycalendar/
Visit my YouTube Page for captures of many of the Night Sky events for each month.