Slew Speed Time

ATRONOMY – ATROPHOTOGRAPHY & IMAGING (40) CALCULATOR Slew Speed Time A precise tool.
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What is the Slew Speed Time & How does it work?
In astrophotography the time it takes a telescope mount to move, or *slew*, from one target to another directly impacts how efficiently you can capture multiple objects during a session. The slew speed is usually expressed in degrees per second and is a key performance metric for both equatorial and alt‑azimuth mounts. The angular distance between two targets, often measured in degrees, is the amount of sky the mount must rotate. This distance depends on the coordinates of the objects and the current pointing of the telescope. Larger angular separations naturally require longer slew times, assuming a constant slew speed. By combining the angular distance (Δθ) with the mount’s slew speed (S), the required slew time (t) can be calculated. This simple relationship helps observers plan imaging sequences and estimate total session duration.
t = frac{Deltatheta}{S}
t = slew time (seconds)  |  Deltatheta = angular distance (degrees)  |  S = slew speed (degrees/second)
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Frequently Asked Questions
What is slew speed in astronomy?
Slew speed refers to how fast a telescope mount can move from one celestial object to another, measured in degrees per second.
How do I calculate the slew time for my telescope?
To calculate slew time, divide the angular distance between two targets by the mount’s maximum slew speed.
What factors affect a telescope’s slew speed?
Factors include the type of mount (equatorial or alt-azimuth), motor performance, and the load on the mount.
Can I increase my telescope’s slew speed?
Yes, you can improve slew speed by upgrading motors, reducing mechanical friction, or using better firmware.
Why is slew speed important in astrophotography?
Slew speed affects how efficiently you can capture multiple objects during a session. Faster slews allow for more targets within the same timeframe.
What is the typical slew speed of a high-end telescope mount?
High-end equatorial mounts typically have a maximum slew speed of around 1-2 degrees per second, while alt-azimuth mounts might be slightly slower.
How does temperature affect telescope slewing?
Temperature changes can cause slight variations in the mount’s performance, potentially affecting the accuracy and speed of slews.

Results are for informational purposes only and do not constitute professional advice.