Asteroid 221 Eos Observation Details
Eos Daily Motion
Eos will rise at 00:47, during twilight, and will ascend to 37° by the time twilight ends at 04:44.221 Eos will be visible until November, 11, 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.
Eos Visibility Timetable on May 09
Eos Rise and Set Timetable
| Time | Elevation | |
| Moon Rise, 87.7% illuminated | 17:00 | -59° |
| Astrosession begin | 22:10 | -31° |
| Eos rise | 00:47 | |
| Astrosession end | 04:44 | 37° |
| Moon Set | 04:47 | 37° |
| Civil sunrise | 05:57 | 41° |
| Eos transit | 06:09 | 41° |
| Sunrise | 06:28 | 41° |
| Eos set | 11:32 |
Track Eos Position Throughout the Night
← Fri, 9 May 2025 →
| Time | |
| Altitude | |
| Azimuth |
Shift the map to change the time and observe Eos changing position in the night sky.
Eos Description
Eos, designated as 221 Eos, is a main-belt asteroid, located between Mars and Jupiter in the solar system. With a diameter of 96 km, 221 Eos completes its orbit around the Sun in 5.2 years. At the moment, 221 Eos is 2.301 AU (344,224,700 km) from Earth, and it is located in the constellation Aquila.Current position of Eos in Solar System
| Date | Fri, 9 May 2025 |
| Distance from Earth to Eos | 2.301 AU (344,224,700km) |
| Elongation | 111° |
| Angular diameter | " |
| Magnitude | 12.83 |
Finder Chart for Eos
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| Object name | 221 Eos |
| Field of view | |
| Limiting magnitude | |
| 221 Eos coordinates | 19.812497636095, -11.509341070736 |
| Center coordinates | 19.812497636095, -11.509341070736 |
Annual motion of Eos
| Date | Sat, 10 May 2025 |
| Twighlight start | 22:11 |
| Twighlight end | 04:42 |
| Twighlight duration | 7h 31m |
| Rise | 00:43 |
| Set | 11:29 |
| Elevation at transit | 41° |
| Transit time | 06:06 |
| Equatorial coordinates | RA: 19h 49m 07s", Dec: -11° 28' 33s |
| Magnitude | 13 |
| Constellation | Aquila |
The graph illustrates the annual visibility pattern of a Eos, 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 Eos 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 Eos 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.