00491+5749 Position and Visibility Tonight
Where is 00491+5749 right now?
00491+5749 is located in the constellation Cassiopeia. It is currently above the horizon at an altitude of 69° toward the north, with an apparent magnitude of 3.52.
Twilight begins at 23:23 local time. At that moment, 00491+5749 will be 69° above the horizon toward the north.
Twilight begins at 23:23 local time. At that moment, 00491+5749 will be 69° above the horizon toward the north.
00491+5749 visibility on 2026-09-27
00491+5749 Visible all night
00491+5749 rise and set timetable
| Time | Elevation | |
| 00491+5749 is always above the horizon | ||
Moonrise, 99.8% illuminated  | 16:51 | 26° |
| Sunset | 16:57 | 27° |
| Civil sunset | 17:24 | 30° |
| Twilight start (−12°) | 17:54 | 34° |
| Astronomical observing session begins | 18:25 | 37° |
| 00491+5749 is always above the horizon | ||
| 00491+5749 transit | 23:32 | 70° |
| Astronomical observing session ends | 03:33 | 46° |
| Twilight end (−12°) | 04:03 | 42° |
| Civil sunrise | 04:34 | 38° |
| Sunrise | 05:01 | 35° |
| Moonset | 06:07 | 27° |
Track 00491+5749 position throughout the night
← 27 September 2026 →
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Shift the map to change the time and observe 00491+5749 changing position in the night sky.
Star system description: 00491+5749
System 00491+5749 — 18-star system, is located in the constellation Cassiopeia, at coordinates RA: 00h 49m 06s", Dec: 57° 48' 54s.
The primary and secondary magnitudes are 3.52 and 7.36. Their separation is 11.3 arcseconds, at position angle 62°. The magnitude difference is 3.84 magnitudes; the primary is approximately 34.4 times brighter.
The primary is yellow; the secondary is red.
The following technical data come from the Washington Double Star Catalog.
The primary and secondary magnitudes are 3.52 and 7.36. Their separation is 11.3 arcseconds, at position angle 62°. The magnitude difference is 3.84 magnitudes; the primary is approximately 34.4 times brighter.
The primary is yellow; the secondary is red.
The following technical data come from the Washington Double Star Catalog.
Technical details: 00491+5749
| Property | Value |
|---|---|
| System identifier | 00491+5749 |
| System type | 18-star system |
| Primary star | eta Cas |
| Right ascension (RA) | 0.81839 (00h 49m 06s") |
| Declination (Dec) | 57.81519 (57° 48' 54s) |
| Primary magnitude | 3.52 |
| Secondary magnitude | 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 |
Components of 00491+5749
| Component | Magnitude | Separation (arcseconds) | Position angle |
| AB | 7.36 | 11.3 | 62 |
| Aa,Ab | 0 | 5.1 | 134 |
| AC | 11.4 | 154.5 | 234 |
| AD | 12.8 | 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 | 355 |
| AI | 11.6 | 102.6 | 79 |
| AJ | 12.3 | 247 | 261 |
| BC | 11.4 | 147.9 | 234 |
| BD | 12.8 | 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 | 2 |
| FG | 9.53 | 141 | 189 |
Data source: Washington Double Star (WDS) Catalog. Maintained by the U.S. Naval Observatory; thanks to the WDS team.
Finder Chart for 00491+5749
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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 | 23:23 |
| Latitude | 37.3541 |
| Longitude | -121.955 |
| Elevation | 69° |
| Azimuth | 3° |
Here you can see the current position of 00491+5749 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 00491+5749 Visible Throughout the Year?
00491+5749 will remain visible until March 20, when it moves too close to the Sun and temporarily disappears from the night sky.
| Date | Mon, 28 September 2026 |
| Astronomical observing session begins | 18:19 |
| Astronomical observing session ends | 03:27 |
| Astronomical observing duration | 9h 8m |
| Rise | 00491+5749 is always up |
| Set | 00491+5749 is always up |
| Elevation at transit | 70° |
| Transit time | 23:28 |
| Equatorial coordinates | RA: 00h 49m 06s", Dec: 57° 48' 54s |
| Magnitude | 4 |
| Constellation | Cassiopeia |
The graph illustrates the annual visibility pattern of 00491+5749, 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 00491+5749 is visible throughout the year in a table with exact rise, transit, and set times for each date.
You can also see when 00491+5749 is visible throughout the year in a table with exact rise, transit, and set times for each date.
Astrometric and Physical Parameters of 00491+5749
Coordinates and Visibility
| Right Ascension | 00h 49m 06s |
| Declination | 57° 48′ 55″ |
| Magnitude | 3.52 |
| Constellation | Cassiopeia |
| Elevation | 69.5° |
| Azimuth | 3.2° |