Comet 90000324 21P/Giacobini-Zinner Observation Details
21P/Giacobini-Zinner Daily Motion
Tonight, observing 21P/Giacobini-Zinner may prove challenging owing to its low elevation. It will reach its transit at by 11:31 and set before sunset at 17:30. Rising near twilight's end at 05:30, it will fade away by 05:50, peaking at just 5° above the horizon.90000324 21P/Giacobini-Zinner will become visible in September, 20. After being too close to the Sun to observe, it will reappear in the night sky. Starting from September, 20, 90000324 21P/Giacobini-Zinner can be seen again, providing a good opportunity for observation.
21P/Giacobini-Zinner Visibility Timetable on August 13
21P/Giacobini-Zinner Rise and Set Timetable
| Time | Elevation | |
| 21P/Giacobini-Zinner transit | 11:31 | 88° |
| 21P/Giacobini-Zinner set | 17:30 | |
| Astrosession begin | 20:19 | -42° |
| Moon Rise, 75.6% illuminated | 22:41 | -78° |
| 21P/Giacobini-Zinner rise | 05:30 | |
| Astrosession end | 05:50 | 5° |
| Civil sunrise | 06:39 | 17° |
| Sunrise | 07:02 | 23° |
| Moon Set | 11:07 | 84° |
Track 21P/Giacobini-Zinner Position Throughout the Night
← Wed, 13 August 2025 →
| Time | |
| Altitude | |
| Azimuth |
Shift the map to change the time and observe 21P/Giacobini-Zinner changing position in the night sky.
21P/Giacobini-Zinner Description
21P/Giacobini-Zinner, designated as 90000324 21P/Giacobini-Zinner, is an Encke-type comet. At the moment, 90000324 21P/Giacobini-Zinner is 2.882 AU (431,111,144 km) from Earth, and it is located in the constellation Monoceros.Current position of 21P/Giacobini-Zinner in Solar System
| Date | Wed, 13 August 2025 |
| Distance from Earth to 21P/Giacobini-Zinner | 2.8818 AU (431,111,144km) |
| Elongation | 28° |
| Angular diameter | " |
| Magnitude | 18.1 |
Finder Chart for 21P/Giacobini-Zinner
Double-click to unlock the map.
| Object name | 90000324 21P/Giacobini-Zinner |
| Field of view | |
| Limiting magnitude | |
| 90000324 21P/Giacobini-Zinner coordinates | 7.99896, -1.89328 |
| Center coordinates | 7.99896, -1.89328 |
Annual motion of 21P/Giacobini-Zinner
| Date | Thu, 14 August 2025 |
| Twighlight start | 20:15 |
| Twighlight end | 05:45 |
| Twighlight duration | 9h 30m |
| Rise | 05:30 |
| Set | 17:28 |
| Elevation at transit | 88° |
| Transit time | 11:29 |
| Equatorial coordinates | RA: 08h 01m 52s", Dec: -2° 02' 43s |
| Magnitude | 18 |
| Constellation | Monoceros |
The graph illustrates the annual visibility pattern of a 21P/Giacobini-Zinner, providing a comprehensive overview of its daily appearances and transit times throughout the year.
The graph is structured with the vertical axis showing the hours of the day, ranging from 12 AM to 12 AM the next day, while the horizontal axis spans each day of the year.
The reddish shaded area indicates the periods when the 21P/Giacobini-Zinner is above the horizon, visible to observers. The white line marks the times when the celestial object reaches its highest point in the sky each day, known as the transit.
The graph is structured with the vertical axis showing the hours of the day, ranging from 12 AM to 12 AM the next day, while the horizontal axis spans each day of the year.
The reddish shaded area indicates the periods when the 21P/Giacobini-Zinner is above the horizon, visible to observers. The white line marks the times when the celestial object reaches its highest point in the sky each day, known as the transit.
Acknowledgments
We acknowledge NASA's Jet Propulsion Laboratory (JPL) for providing essential data on asteroids and comets through their Small-Body Database (SBDB) and Center for Near-Earth Object Studies (CNEOS). Their continuous efforts in tracking and cataloging these celestial bodies make it possible to offer accurate and up-to-date information on their positions, orbits, and physical characteristics.