100 Her Position and Visibility Tonight
Where is 100 Her right now?
100 Her is located in the constellation Hercules. Although 100 Her is currently 11° above the horizon, it is not visible because it is daytime.
Twilight begins at 19:36 local time. At that moment, 100 Her will be 41° above the horizon toward the north-west.
Twilight begins at 19:36 local time. At that moment, 100 Her will be 41° above the horizon toward the north-west.
100 Her visibility on 2026-10-29
100 Her Visible from sunset until before midnight
100 Her rise and set timetable
| Time | Elevation | |
| 100 Her transit | 16:41 | 65° |
| Sunset | 18:49 | 50° |
| Civil sunset | 19:11 | 46° |
| Twilight start (−12°) | 19:36 | 41° |
| Astronomical observing session begins | 20:01 | 36° |
Moonrise, 89% illuminated  | 21:56 | 10° |
| 100 Her set | 22:43 | |
| Astronomical observing session ends | 05:35 | -59° |
| Moonset | 10:35 | -0° |
| 100 Her rise | 10:36 |
Track 100 Her position throughout the night
← 29 October 2026 →
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Shift the map to change the time and observe 100 Her changing position in the night sky.
Star system description: 100 Her
A double or multiple star system in Hercules.
Pair AB has a measured separation of 14.7″; a telescope may be needed to split it.
The diagram uses the latest WDS measurements; north is up and east is right. Measurements may be from different years. Unconnected groups are arranged separately; close pairs may merge, and pairs without reliable geometry are omitted.
Technical details: 100 Her
| Property | Value |
|---|---|
| System identifier | WDS 18078+2606 |
| Bayer / Flamsteed designation | 100 Her |
| Constellation | Hercules |
| System type | multiple star system |
| Right ascension (RA) | 18h 07m 49s" |
| Declination (Dec) | 26° 06' 04s |
| Component | AB |
| Primary magnitude | 5.81 |
| Secondary magnitude | 5.84 |
| Separation (arcseconds) | 14.7″ |
| Position angle | 183° |
| Discovery year | 1777 |
| Last observed | 2025 |
| Spectral type (primary/secondary) | A3V |
| Number of observations | 224 |
4 components are identified in WDS; this is not a count of resolved stars.
Components of 100 Her
Each row is a separate WDS component pair. Measurements may come from different years.
| Component | Primary magnitude | Secondary magnitude | Separation (arcseconds) | Position angle | Last observed |
|---|---|---|---|---|---|
| AB | 5.81 | 5.84 | 14.7″ | 183° | 2025 |
| Aa,Ab | 5.90 | 8.80 | 0.2″ | 313° | 2023 |
| AC | 5.87 | 11.80 | 79.9″ | 127° | 2000 |
Notes
- U: Proper motion indicates a non-physical pair.
Data source: Washington Double Star (WDS) Catalog. Maintained by the U.S. Naval Observatory; thanks to the WDS team.
Finder Chart for 100 Her
100 Her Passage Through Night
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Current position of 100 Her
| Time | 11:27 |
| Latitude | 1.35208 |
| Longitude | 103.82 |
| Elevation | 11° |
| Azimuth | 64° |
Here you can see the current position of 100 Her on the map, as well as its positions for rise and set. This tool lets you track its movement throughout the night with accurate, up-to-date information.
When Is 100 Her Visible Throughout the Year?
100 Her will remain visible until November 12, when it moves too close to the Sun and temporarily disappears from the night sky.
| Date | Fri, 30 October 2026 |
| Astronomical observing session begins | 19:59 |
| Astronomical observing session ends | 05:32 |
| Astronomical observing duration | 10h 33m |
| Rise | 10:36 |
| Set | 22:39 |
| Elevation at transit | 65° |
| Transit time | 16:37 |
| Equatorial coordinates | RA: 18h 07m 49s", Dec: 26° 06' 04s |
| Magnitude | 6 |
| Constellation | Hercules |
The graph illustrates the annual visibility pattern of 100 Her, including its daily appearances and transit times. The vertical axis shows the hours of the day and the horizontal axis spans the year. The reddish area marks when the object is above the horizon, while the white line marks its daily transit.
You can also see when 100 Her is visible throughout the year in a table with exact rise, transit, and set times for each date.
You can also see when 100 Her is visible throughout the year in a table with exact rise, transit, and set times for each date.
Astrometric and Physical Parameters of 100 Her
Coordinates and Visibility
| Right Ascension | 18h 07m 50s |
| Declination | 26° 06′ 04″ |
| Magnitude | 5.81 |
| Constellation | Hercules |
| Elevation | 10.6° |
| Azimuth | 63.7° |