Observation details: asteroid Helena
Daily motion of Helena
101 Helena will remain visible until April 3, when it moves too close to the Sun and temporarily disappears from the night sky.
Helena visibility on 2026-08-18
101 Helena Visible from early morning until sunrise
Helena rise and set timetable
| Time | Elevation | |
Moonrise, 21% illuminated  | 09:49 | 4° |
| Astronomical observing session begins | 19:32 | -8° |
| Helena rise | 20:16 | |
| Moonset | 20:26 | 2° |
| Astronomical observing session ends | 02:51 | 70° |
| Helena transit | 03:11 | 70° |
| Twilight end | 03:26 | 70° |
| Civil sunrise | 03:59 | 68° |
| Sunrise | 04:28 | 64° |
| Helena set | 10:05 |
Track Helena Position Throughout the Night
← 18 August 2026 →
| Time | |
| Altitude | |
| Azimuth |
Shift the map to change the time and observe Helena changing position in the night sky.
Helena Description
This asteroid is designated 101 Helena, main-belt asteroid Its diameter is approximately 66 km. 101 Helena completes an orbit around the Sun in 4.2 years. It is currently 1.683 AU (251,825,576 km) from Earth, and is located in the constellation Aries.Current position in the Solar System: Helena
| Date | Tue, 18 August 2026 |
| Distance from Earth | 1.67848 AU (251,097,034km) |
| Elongation | 113° |
| Angular diameter | " |
| Magnitude | 12.2 |
Finder Chart for Helena
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| Object name | Helena |
| Field of view | |
| Limiting magnitude | |
| Helena coordinates | 1.84336, 17.38875 |
| Center coordinates | 1.84336, 17.38875 |
Annual motion of Helena
| Date | Tue, 18 August 2026 |
| Twilight start | 19:28 |
| Twilight end | 02:44 |
| Twilight duration | 7h 17m |
| Rise | 20:16 |
| Set | 10:05 |
| Elevation at transit | 70° |
| Transit time | 03:11 |
| Equatorial coordinates | RA: 01h 50m 56s", Dec: 17° 31' 39s |
| Magnitude | 12 |
| Constellation | Aries |
The graph summarizes the object’s annual visibility, daily observing windows and transit times.
The vertical axis shows time of day and the horizontal axis shows the days of the year.
The shaded area marks when the object is above the horizon; the white line marks daily transit. You can also view the detailed annual visibility table.
The vertical axis shows time of day and the horizontal axis shows the days of the year.
The shaded area marks when the object is above the horizon; the white line marks daily transit. You can also view the detailed annual visibility table.
Astrometric and Physical Parameters of 101 Helena
Coordinates and Visibility
| Right Ascension | 1.84336° |
| Declination | 17.38875° |
| Magnitude | 12.2 |
| Constellation | Aries |
| Elevation | 46° |
| Azimuth | 255.6° |
Acknowledgments
Orbital and small-body data are provided by NASA Jet Propulsion Laboratory (JPL) Small-Body Database (SBDB) and Center for Near-Earth Object Studies (CNEOS). These resources support accurate positions, orbits and physical characteristics.