18443 3940 Position and Visibility Tonight
Where is 18443+3940 right now?
18443+3940 is located in the constellation LYRA. Although 18443+3940 is currently 26° above the horizon, it is not visible because it is daytime.
Twilight begins at 18:12 local time. At that moment, 18443+3940 will be 88° above the horizon toward the north.
Twilight begins at 18:12 local time. At that moment, 18443+3940 will be 88° above the horizon toward the north.
18443+3940 visibility on 2026-09-16
18443+3940 Visible from sunset until early morning
18443+3940 rise and set timetable
| Time | Elevation | |
Moonrise, 16% illuminated  | 09:41 | 1° |
| Sunset | 17:13 | 78° |
| Civil sunset | 17:41 | 84° |
| 18443+3940 transit | 18:11 | 88° |
| Twilight start (−12°) | 18:12 | 88° |
| Astronomical observing session begins | 18:43 | 83° |
| Moonset | 19:28 | 75° |
| 18443+3940 set | 02:47 | |
| Astronomical observing session ends | 03:22 | -4° |
| 18443+3940 rise | 09:32 |
Track 18443+3940 position throughout the night
← 16 September 2026 →
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Star system description: 18443+3940
System 18443+3940 — 20-star system, is located in the constellation Lyra, at coordinates RA: 18h 44m 20s", Dec: 39° 40' 12s.
The primary and secondary magnitudes are 5.15 and 6.10. Their separation is 4 arcseconds, at position angle 45°. The magnitude difference is 0.95 magnitudes; the primary is approximately 2.4 times brighter.
The primary is white; the secondary is yellow-white.
The following technical data come from the Washington Double Star Catalog.
The primary and secondary magnitudes are 5.15 and 6.10. Their separation is 4 arcseconds, at position angle 45°. The magnitude difference is 0.95 magnitudes; the primary is approximately 2.4 times brighter.
The primary is white; the secondary is yellow-white.
The following technical data come from the Washington Double Star Catalog.
Technical details: 18443+3940
| Property | Value |
|---|---|
| System identifier | 18443+3940 |
| System type | 20-star system |
| Primary star | eps 1 Lyr |
| Right ascension (RA) | 18.73897 (18h 44m 20s") |
| Declination (Dec) | 39.67011 (39° 40' 12s) |
| Primary magnitude | 5.15 |
| Secondary magnitude | 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 |
Components of 18443+3940
| 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 |
Data source: Washington Double Star (WDS) Catalog. Maintained by the U.S. Naval Observatory; thanks to the WDS team.
Finder Chart for 18443+3940
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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 | 12:31 |
| Latitude | 37.3541 |
| Longitude | -121.955 |
| Elevation | 26° |
| Azimuth | 59° |
Here you can see the current position of 18443 3940 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 18443 3940 Visible Throughout the Year?
18443+3940 will remain visible until December 25, when it moves too close to the Sun and temporarily disappears from the night sky.
| Date | Wed, 16 September 2026 |
| Astronomical observing session begins | 18:39 |
| Astronomical observing session ends | 03:16 |
| Astronomical observing duration | 9h 37m |
| Rise | 09:32 |
| Set | 02:43 |
| Elevation at transit | 88° |
| Transit time | 18:07 |
| Equatorial coordinates | RA: 18h 44m 20s", Dec: 39° 40' 12s |
| Magnitude | 5 |
| Constellation | Lyra |
The graph illustrates the annual visibility pattern of 18443 3940, 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 18443 3940 is visible throughout the year in a table with exact rise, transit, and set times for each date.
You can also see when 18443 3940 is visible throughout the year in a table with exact rise, transit, and set times for each date.
Astrometric and Physical Parameters of 18443+3940
Coordinates and Visibility
| Right Ascension | 18h 44m 20s |
| Declination | 39° 40′ 12″ |
| Magnitude | 5.15 |
| Constellation | Lyra |
| Elevation | 25.9° |
| Azimuth | 58.5° |