Asteroid 85 Io Observation Details
Io Daily Motion
Io will be visible throughout the entire night. It will rise at 16:08, just before twilight begins, and will be at 20° when twilight starts at 17:50. It will reach its transit at 61° at 22:32, and will fade away as twilight ends at 03:54, being at 12° elevation.85 Io will be visible until March, 23, when it will move too close to the Sun. During this time, its proximity to the Sun will cause it to disappear from the night sky, making it unobservable for a while.
Io Visibility Timetable on October 21
Io Rise and Set Timetable
| Time | Elevation | |
| Moon Rise, 0.9% illuminated | 04:37 | 5° |
| Moon Set | 15:52 | -3° |
| Io rise | 16:08 | |
| Sunset | 16:22 | 3° |
| Civil sunset | 16:49 | 8° |
| Astrosession begin | 17:50 | 20° |
| Io transit | 22:32 | 61° |
| Astrosession end | 03:54 | 12° |
| Civil sunrise | 04:55 | 0° |
| Io set | 04:57 |
Track Io Position Throughout the Night
← Tue, 21 October 2025 →
| Time | |
| Altitude | |
| Azimuth |
Shift the map to change the time and observe Io changing position in the night sky.
Io Description
Io, designated as 85 Io, is a main-belt asteroid, located between Mars and Jupiter in the solar system. With a diameter of 154 km, 85 Io completes its orbit around the Sun in 4.3 years. At the moment, 85 Io is 1.328 AU (198,651,013 km) from Earth, and it is located in the constellation Pisces.Current position of Io in Solar System
| Date | Tue, 21 October 2025 |
| Distance from Earth to Io | 1.3281 AU (198,680,932km) |
| Elongation | 175° |
| Angular diameter | " |
| Magnitude | 10.6 |
Finder Chart for Io
Double-click to unlock the map.
| Object name | 85 Io |
| Field of view | |
| Limiting magnitude | |
| 85 Io coordinates | 1.41985, 8.33186 |
| Center coordinates | 1.41985, 8.33186 |
Annual motion of Io
| Date | Wed, 22 October 2025 |
| Twighlight start | 17:49 |
| Twighlight end | 03:53 |
| Twighlight duration | 10h 4m |
| Rise | 16:04 |
| Set | 04:52 |
| Elevation at transit | 61° |
| Transit time | 22:28 |
| Equatorial coordinates | RA: 01h 24m 27s", Dec: 08° 08' 47s |
| Magnitude | 11 |
| Constellation | Pisces |
The graph illustrates the annual visibility pattern of a Io, 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 Io 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 Io 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.
Astrometric & Physical Parameters of 85 Io
Coordinates & Visibility
| Right Ascension | 1.41985° |
| Declination | 8.33186° |
| Magnitude | 10.6 |
| Constellation | Pisces |
| Elevation | -2.4° |
| Azimuth | -77.6° |
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.