Double Star 18443+3940 Observation Details
18443+3940 Daily Motion
18443+3940 will rise before twilight begins, at 19:09, and will reach 19° elevation by the time twilight commences at 21:29. It will reach its transit at 89° by 03:57 and gradually fade away as the night ends at 04:43, maintaining an elevation of around 81°.18443+3940 will be visible until December, 27, 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.
18443+3940 Visibility Timetable on May 21
18443+3940 Rise and Set Timetable
| Time | Elevation | |
| 18443+3940 rise | 19:09 | |
| Sunset | 20:19 | 9° |
| Civil sunset | 20:51 | 13° |
| Astrosession begin | 22:11 | 26° |
| Moon Rise, 41.7% illuminated | 02:31 | 73° |
| 18443+3940 transit | 03:57 | 89° |
| Astrosession end | 04:01 | 89° |
| Civil sunrise | 05:21 | 74° |
| Sunrise | 05:53 | 68° |
| 18443+3940 set | 12:45 | |
| Moon Set | 14:05 | -7° |
Track 18443+3940 Position Throughout the Night
← Wed, 21 May 2025 →
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18443+3940 Star System Description
18443+3940 is 20-star Star System located in constellation Lyra at coordinates RA: 18h 44m 20s", Dec: 39° 40' 12s.
The primary component has a magnitude of 5.15, while the secondary component has a magnitude of 6.10. They are separated by 4 arcseconds at a position angle of 45 degrees. The brightness difference between the two components is 0.95 magnitudes, with the primary component being approximately 2.4 times brighter than the secondary.
The primary star is white in color, and the secondary star is yellow-white.
Below is a table with star system details from the Washington Double Star (WDS) Catalog. This catalog is a comprehensive source of information on double and multiple star systems, providing key data on the positions, magnitudes, and separations of stellar components.
The primary component has a magnitude of 5.15, while the secondary component has a magnitude of 6.10. They are separated by 4 arcseconds at a position angle of 45 degrees. The brightness difference between the two components is 0.95 magnitudes, with the primary component being approximately 2.4 times brighter than the secondary.
The primary star is white in color, and the secondary star is yellow-white.
Below is a table with star system details from the Washington Double Star (WDS) Catalog. This catalog is a comprehensive source of information on double and multiple star systems, providing key data on the positions, magnitudes, and separations of stellar components.
Technical Details of Star System 18443+3940
| Property | Value |
|---|---|
| Star System Identifier | 18443+3940 |
| System Type | 20-star Star System |
| Primary Star | eps 1 Lyr |
| Right Ascension (RA) | 18.73897 (18h 44m 20s") |
| Declination (Dec) | 39.67011 (39° 40' 12s) |
| Magnitude (Primary) | 5.15 |
| Magnitude (Secondary) | 6.10 |
| Spectral Type (Primary/Secondary) | A4V+F1V (white/yellow-white) |
| Separation (Arcseconds) | 4.0 |
| Position Angle | 45° |
| Discovery Year | 1777 |
| Last Observed | 2023 |
| Primary Proper Motion (Ra, Dec) | +011+061 |
| Secondary Proper Motion (Ra, Dec) | +002+047 |
| Number of Observations | 654 |
18443+3940 Components
| Component | Magnitude | Separation (arcseconds) | Position Angle |
| AB | 6.10 | 4.0 | 45 |
| AB,CD | 4.56 | 207.3 | 173 |
| AD | 5.38 | 209.0 | 172 |
| AI | 10.12 | 145.4 | 135 |
| BC | 5.25 | 210.6 | 173 |
| BD | 5.38 | 212.2 | 173 |
| BI | 10.12 | 145.5 | 136 |
| Ca,Cb | . | 0.2 | 66 |
| CD | 5.38 | 2.0 | 180 |
| CD,F | 12.7 | 94.5 | 359 |
| CD,G | 14.2 | 76.3 | 294 |
| CD,H | 13.9 | 96.6 | 313 |
| CE | 12.3 | 63.7 | 333 |
| CI | 10.12 | 129.1 | 37 |
| DI | 10.12 | 126.4 | 36 |
| EF | 12.7 | 45.0 | 41 |
| EG | 14.2 | 42.6 | 247 |
| EI | 10.12 | 109.1 | 68 |
| GH | 13.9 | 25.0 | 356 |
The data presented in this table is sourced from the Washington Double Star (WDS) Catalog, a comprehensive repository of double and multiple star system information maintained by the U.S. Naval Observatory. We thank the WDS team for their continued efforts in providing accurate and detailed astronomical data.
Finder Chart for eps 1 Lyr
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| Object name | 18443+3940 |
| Field of view | |
| Limiting magnitude | |
| 18443+3940 coordinates | 18.73897, 39.67011 |
| Center coordinates | 18.73897, 39.67011 |
18443+3940 Passage Through Night
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Current position of 18443+3940
| Time | 10:04 |
| Latitude | 39.0469 |
| Longitude | -77.4903 |
| 18443+3940 elevation | 23° |
| 18443+3940 Azimuth | 57° |
Here you can see the current position of the 18443+3940 on the map, as well as its positions for rise and set. This tool allows you to track the 18443+3940's movement throughout the night, providing you with accurate and up-to-date information.
Annual motion of 18443+3940
| Date | Wed, 21 May 2025 |
| Twighlight start | 22:07 |
| Twighlight end | 03:56 |
| Twighlight duration | 6h 49m |
| Rise | 19:09 |
| Set | 12:45 |
| Elevation at transit | 89° |
| Transit time | 03:57 |
| Equatorial coordinates | RA: 18h 44m 20s", Dec: 39° 40' 12s |
| Magnitude | 5 |
| Constellation | Lyra |
The graph illustrates the annual visibility pattern of a 18443+3940, 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 18443+3940 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 18443+3940 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.