Asteroid 128 Nemesis Observation Details
Nemesis Daily Motion
Nemesis will rise before twilight begins, at 17:37, and will reach 46° elevation by the time twilight commences at 22:21. It will reach its transit at 50° by 23:35 and gradually fade away as the night ends at 04:35, maintaining an elevation of around 11°.128 Nemesis will be visible until July, 17, 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.
Nemesis Visibility Timetable on May 09
Nemesis Rise and Set Timetable
| Time | Elevation | |
| Moon Rise, 87.4% illuminated | 17:00 | -7° |
| Nemesis rise | 17:37 | |
| Sunset | 20:32 | 32° |
| Civil sunset | 21:04 | 37° |
| Astrosession begin | 22:21 | 46° |
| Nemesis transit | 23:35 | 50° |
| Astrosession end | 04:35 | 11° |
| Moon Set | 04:45 | 9° |
| Nemesis set | 05:32 |
Track Nemesis Position Throughout the Night
← Fri, 9 May 2025 →
| Time | |
| Altitude | |
| Azimuth |
Shift the map to change the time and observe Nemesis changing position in the night sky.
Nemesis Description
Nemesis, designated as 128 Nemesis, is a main-belt asteroid, located between Mars and Jupiter in the solar system. With a diameter of 162 km, 128 Nemesis completes its orbit around the Sun in 4.6 years. At the moment, 128 Nemesis is 2.196 AU (328,516,924 km) from Earth, and it is located in the constellation Virgo.Current position of Nemesis in Solar System
| Date | Fri, 9 May 2025 |
| Distance from Earth to Nemesis | 2.196 AU (328,516,924km) |
| Elongation | 148° |
| Angular diameter | " |
| Magnitude | 12.5 |
Finder Chart for Nemesis
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| Object name | 128 Nemesis |
| Field of view | |
| Limiting magnitude | |
| 128 Nemesis coordinates | 13.196639502945, -0.35164302467281 |
| Center coordinates | 13.196639502945, -0.35164302467281 |
Annual motion of Nemesis
| Date | Sat, 10 May 2025 |
| Twighlight start | 22:18 |
| Twighlight end | 04:28 |
| Twighlight duration | 6h 10m |
| Rise | 17:32 |
| Set | 05:28 |
| Elevation at transit | 50° |
| Transit time | 23:30 |
| Equatorial coordinates | RA: 13h 11m 12s", Dec: 00° 19' 57s |
| Magnitude | 13 |
| Constellation | Virgo |
The graph illustrates the annual visibility pattern of a Nemesis, 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 Nemesis 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 Nemesis 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.