Double Star 00491+5749 Position and Visibility Tonight
Where is 00491+5749 right now?
00491+5749 is located in the constellation Cassiopeia. Although it is currently above the horizon at an altitude of 55 degrees, 00491+5749 is not visible because it is daytime.
Twilight begins at 18:43 local time, and at that moment, 00491+5749 will appear at an altitude of 15 degrees toward the northeast.
Twilight begins at 18:43 local time, and at that moment, 00491+5749 will appear at an altitude of 15 degrees toward the northeast.
00491+5749 Visibility on April 17
00491+5749 is Not visible tonight
00491+5749 Rise and Set Timetable
| Time | Elevation | |
| 00491+5749 is always above the horizon | ||
Moon Rise, 3.1% illuminated  | 03:49 | 27° |
| 00491+5749 transit | 10:17 | 70° |
| Moon Set | 17:17 | 24° |
| Sunset | 17:42 | 21° |
| Civil sunset | 18:11 | 18° |
| Twighlight start | 18:43 | 15° |
| Astrosession begin | 19:17 | 12° |
| 00491+5749 is always above the horizon | ||
| Astrosession end | 02:57 | 22° |
| Twighlight end | 03:30 | 26° |
| Civil sunrise | 04:03 | 30° |
| Sunrise | 04:31 | 33° |
Track 00491+5749 Position Throughout the Night
← Fri, 17 April 2026 →
| Time | |
| Altitude | |
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Shift the map to change the time and observe 00491+5749 changing position in the night sky.
00491+5749 Star System Description
00491+5749 is 18-star Star System located in constellation Cassiopeia at coordinates RA: 00h 49m 06s", Dec: 57° 48' 54s.
The primary component has a magnitude of 3.52, while the secondary component has a magnitude of 7.36. They are separated by 11.3 arcseconds at a position angle of 62 degrees. The brightness difference between the two components is 3.84 magnitudes, with the primary component being approximately 34.4 times brighter than the secondary.
The primary star is yellow in color, and the secondary star is red.
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 3.52, while the secondary component has a magnitude of 7.36. They are separated by 11.3 arcseconds at a position angle of 62 degrees. The brightness difference between the two components is 3.84 magnitudes, with the primary component being approximately 34.4 times brighter than the secondary.
The primary star is yellow in color, and the secondary star is red.
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 00491+5749
| Property | Value |
|---|---|
| Star System Identifier | 00491+5749 |
| System Type | 18-star Star System |
| Primary Star | eta Cas |
| Right Ascension (RA) | 0.81839 (00h 49m 06s") |
| Declination (Dec) | 57.81519 (57° 48' 54s) |
| Magnitude (Primary) | 3.52 |
| Magnitude (Secondary) | 7.36 |
| Spectral Type (Primary/Secondary) | G1V+M (yellow/red) |
| Separation (Arcseconds) | 11.3 |
| Position Angle | 62° |
| Discovery Year | 2015 |
| Last Observed | 2015 |
| Primary Proper Motion (Ra, Dec) | +114-057 |
| Secondary Proper Motion (Ra, Dec) | |
| Number of Observations | 2 |
00491+5749 Components
| Component | Magnitude | Separation (arcseconds) | Position Angle |
| AB | 7.36 | 11.3 | 62 |
| Aa,Ab | . | 5.1 | 134 |
| AC | 11.4 | 154.5 | 234 |
| AD | 12.80 | 159.8 | 34 |
| AE | 10.15 | 276.2 | 118 |
| AF | 11.53 | 281.7 | 268 |
| AG | 9.53 | 293.7 | 231 |
| AH | 8.41 | 689.0 | 355 |
| AI | 11.6 | 102.6 | 79 |
| AJ | 12.3 | 247.0 | 261 |
| BC | 11.4 | 147.9 | 234 |
| BD | 12.80 | 172.2 | 1 |
| BE | 10.15 | 207.3 | 118 |
| BF | 11.53 | 359.1 | 274 |
| BG | 9.53 | 396.1 | 253 |
| BH | 8.41 | 651.0 | 2 |
| FG | 9.53 | 141.0 | 189 |
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 eta Cas
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| Object name | 00491+5749 |
| Field of view | |
| Limiting magnitude | |
| 00491+5749 coordinates | 0.81839, 57.81519 |
| Center coordinates | 0.81839, 57.81519 |
00491+5749 Passage Through Night
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Current position of 00491+5749
| Time | 13:10 |
| Latitude | 37.3541 |
| Longitude | -121.955 |
| 00491+5749 elevation | 55° |
| 00491+5749 Azimuth | 40° |
Here you can see the current position of the 00491+5749 on the map, as well as its positions for rise and set. This tool allows you to track the 00491+5749's movement throughout the night, providing you with accurate and up-to-date information.
Annual motion of 00491+5749
00491+5749 will become visible in May, 1. After being too close to the Sun to observe, it will reappear in the night sky. Starting from May, 1, 00491+5749 can be seen again, providing a good opportunity for observation.
| Date | Fri, 17 April 2026 |
| Twighlight start | 19:12 |
| Twighlight end | 02:52 |
| Twighlight duration | 8h 40m |
| Rise | 00491+5749 is always up |
| Set | 00491+5749 is always up |
| Elevation at transit | 70° |
| Transit time | 10:13 |
| Equatorial coordinates | RA: 00h 49m 06s", Dec: 57° 48' 54s |
| Magnitude | 4 |
| Constellation | Cassiopeia |
The graph illustrates the annual visibility pattern of a 00491+5749, 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 00491+5749 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.
You can also view detailed visibility information in a dedicated table, including exact rise, transit, and set times for each date.
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 00491+5749 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.
You can also view detailed visibility information in a dedicated table, including exact rise, transit, and set times for each date.
Astrometric & Physical Parameters of 00491+5749
Coordinates & Visibility
| Right Ascension | 0.81839° |
| Declination | 57.81519° |
| Magnitude | 3.52 |
| Constellation | Cassiopeia |
| Elevation | 55.2° |
| Azimuth | 39.9° |