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Polaris

Polaris is Earth's current northern pole star, and thus is commonly referred to as the North Star. Historically, Polaris was used by sailors and navigators to determine their current latitude while crossing oceans. Please place all questions about Polaris, the brightest star in the constellation Ursa Minor, into this category.

543 Questions

What is the altitude of polaris?

The altitude of Polaris, also known as the North Star, is approximately equal to the observer's latitude in the Northern Hemisphere. For example, if you are at a latitude of 40 degrees North, Polaris will be about 40 degrees above the northern horizon. Conversely, in the Southern Hemisphere, Polaris is not visible, as it is positioned above the North Pole.

Is polaris brighter than the sun?

It all depends on your point of view - literally.

  • Apparent magnitude: +1.97
  • Absolute magnitude: -3.63

See related question.

Does polaris move less than any other visible star in the sky?

Yes. Polaris (The Pole Star) Is very nearly overhead at the North Pole.

As the Earth turns on it's axis all the other starts appear to move overhead in an arc. As Polaris is near the centre of rotation, it only appears to move in a small circle.

What is an electronic throttle?

Electronic throttle control (ETC) is an automobile technology which severs the mechanical link between the accelerator pedal and the throttle. Most automobiles already use a throttle position sensor (TPS) to provide input to traction control, antilock brakes, fuel injection, and other systems, but use a bowden cable to directly connect the pedal with the throttle. An ETC-equipped vehicle has no such cable. Instead, the electronic control unit (ECU) determines the required throttle position by calculations from data measured by other sensors such as an accelerator pedal position sensor, engine speed sensor, vehicle speed sensor etc. The electric motor within the ETC is then driven to the required position via a closed-loop control algorithm within the ECU.

The benefits of ETC are largely unnoticed by most drivers because the aim is to make the vehicle power-train characteristics seamlessly consistent irrespective of prevailing conditions, such as engine temperature, altitude, accessory loads etc. The ETC is also working 'behind the scenes' to dramatically improve the ease with which the driver can execute gear changes and deal with the dramatic torque changes associated with rapid accelerations and decelerations.

Contrary to popular belief, except in concert with other technologies such as gasoline direct injection, ETC provides only a very limited benefit in areas such as air-fuel ratio control, exhaust emissions and fuel consumption reduction. ETC however makes it much easier to integrate features to the vehicle such as cruise control, traction control, stability control and others that require torque management, since the throttle can be moved irrespective of the position of the driver's accelerator pedal. A criticism of the very early ETC implementations was that they were "overruling" driver decisions. Nowadays, the vast majority of drivers have no idea how much intervention is happening.

Much of the engineering involved with drive-by-wire technologies including ETC deals with failure and fault management. Most ETC systems have sensor and controller redundancy, even as complex as independent microprocessors with independently written software within a control module whose calculations are compared to check for possible errors and faults.

Anti-lock braking (ABS) is a similar safety critical technology, whilst not completely 'by-wire', it has the ability to electronically intervene contrary to the driver's demand. Such technology has recently been extended to other vehicle systems to include features like brake assist and electronic steering control, but these systems are much less common, also requiring careful design to ensure appropriate back-up and fail-safe modes.

Above retrieved from, http://en.wikipedia.org/wiki/Electronic_throttle_control

Viper1

How can you find polaris using the big dipper?

The two stars in the front of the bowl of the Big Dipper point to Polaris.

What is the color size and apparent brightness of polaris?

The main star in the Polaris system, Polaris Aa, is a yellow super-giant, with a radius which is 46 +/- 3 times that of the sun. Its apparent magnitude is 1.98 but it is a Cepheid variable.

What is the most powerful star in the universe?

Depends on how you define power.

If we take it as transferring energy then it will have to be the most luminous.

So the most luminous star known in the Universe is R136a1

What is polaris apparent magnitude?

The apparent magnitude od the main star in the Polaris system is 1.98

What age is polaris?

The main star is the Polaris system is 7*10^7 years old.

What is the altitude or polaris in utica?

43 degrees because the altitude of polaris is equal to the latitude of utica.

Is The North Star is the last star in the constellation known as Ursa Minor?

Polaris, also known as the North Star, is the final star in the handle of Ursa Minor, which is known as "The Little Dipper." It is easy to find because the two stars that make up the side of the bowl of Ursa Major that are not attached to its handle point directly to it.

Does Polaris seem to change positions throughout the year?

No, Polaris is always in the same spot in the sky.

Where is the polaris located the star?

Almost directly above the North Pole.

What star pattern points to polaris?

The Big Dipper, or Ursa Major has two stars (sometimes called the pointer stars) which line up directly with Polaris. Those two stars, at the "lip" edge of the Big Dipper, are Dubhe and Merak. Merak is at the "bottom" of the Big Dipper, and Dubhe is right at the "lip".

Is polaris star on big dipper?

No, Polaris (the North Star) is part of the Little Dipper (which is part of the constellation Ursa Minor, "The Little Bear"). Polaris is the bottom-most star in the "handle" of the Little Dipper.

What is the apparent brihtness of the polaris?

The apparent brightness of the main star in the system is 1.98 but remember that this is a Cepheid variable.

Seen from northern latitudes what is the location of the star Polaris?

Polaris, the North Star, would only appear overhead if you were standing at the North Pole. From my location near Sacramento, CA, the star Polaris is visible about 40 degrees above the horizon, and is always in the same place. It does not appear to move.