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Sky-Tonight.com / Asteroids / 221 Eos
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Observation Settings

Or select it on the map:
This Earth map fragment is intended to illustrate celestial motion across the sky, emphasizing both bearing and elevational perspectives. The map's center point corresponds to the transit, showcasing celestial objects at their highest point, while elevation gradually decreases towards the map edges. This dynamic representation offers insights into the changing positions of celestial bodies with a focus on their bearing and elevational trajectories.
Your location: Columbus, United States
Timezone:
Latitude:
39.9625
Longitude:
-83.0061

Asteroid 221 Eos Observation Details

Eos

Eos Daily Motion

Eos will be visible throughout the entire night. It will rise at 19:42, just before twilight begins, and will be at 29° when twilight starts at 22:48. It will reach its transit at 36° at 00:54, and will fade away as twilight ends at 04:28, being at 17° elevation.
221 Eos will be visible until October, 12, 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 July 22

Eos Rise and Set Timetable

TimeElevation
Moon Set18:42-11°
Eos rise19:42
Sunset20:5312°
Civil sunset21:2618°
Astrosession begin22:4829°
Eos transit00:5436°
Moon Rise, 8.4% illuminated02:3032°
Astrosession end04:2817°
Civil sunrise05:503°
Eos set06:06

Track Eos Position Throughout the Night

← Tue, 22 July 2025 →

Elevation (degrees)
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 1.769 AU (264,683,513 km) from Earth, and it is located in the constellation Sagittarius.

Current position of Eos in Solar System

Earth Eos
DateTue, 22 July 2025
Distance from Earth to Eos1.77 AU (264,788,231km)
Elongation168°
Angular diameter"
Magnitude11.6
This section provides an interactive projection of the solar system, illustrating the relative positions of Eos, Earth, and the Sun throughout the year. By sliding the image left or right, you can change the day of the year, observing how the positions of Eos and Earth shift in their orbits around the Sun.

Finder Chart for Eos

Double-click to unlock the map.
Object name221 Eos
Field of view
Limiting magnitude
221 Eos coordinates19.39253, -13.75356
Center coordinates19.39253, -13.75356

Annual motion of Eos

Time
DateTue, 22 July 2025
Twighlight start22:44
Twighlight end04:22
Twighlight duration6h 38m
Rise19:42
Set06:05
Elevation at transit36°
Transit time00:54
Equatorial coordinatesRA: 19h 22m 46s", Dec: -13° 50' 52s
Magnitude12
ConstellationSagittarius
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.

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.