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Bradycardia is a medical condition in which the heart rate is slower than normal. It occurs when the heart's natural pacemaker, the sinus node, generates slower electrical impulses than the standard rhythm. In adults, bradycardia is diagnosed when the pulse rate falls below 60 beats per minute, indicating a deviation from the normal heart rate range.
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A decreasing function describes a relationship where the output consistently declines as the input increases. This means that for any two input values, if one is greater than the other, the corresponding output is smaller. Mathematically, a function f is decreasing on an interval I if for every x1 < x2​ in I, f (x1) > f (x2). This type of behavior is visually identified on a graph that slopes downward from left to right.The nature of a function can be analyzed by calculating...
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A rapid decrease in the rotation rate of comet 41P/Tuttle-Giacobini-Kresák.

Dennis Bodewits1, Tony L Farnham1, Michael S P Kelley1

  • 1Department of Astronomy, University of Maryland, College Park, Maryland 20742, USA.

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This summary is machine-generated.

Observations of comet 41P/Tuttle-Giacobini-Kresák revealed a dramatic slowing of its rotation. This rapid change in spin rate, caused by outgassing, suggests the comet is nearing an unstable state.

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Area of Science:

  • * Planetary Science
  • * Cometary Dynamics
  • * Astrophysics

Background:

  • * Cometary outgassing generates torques that alter the spin state of cometary nuclei, influencing their evolution and lifespan.
  • * Rapid rotation can lead to nucleus fragmentation due to exceeding material strength from centripetal forces.
  • * Slowing torques can destabilize spin states, potentially leading to reorientation and increased rotation rates over time.

Purpose of the Study:

  • * To investigate the spin dynamics of comet 41P/Tuttle-Giacobini-Kresák during its close Earth approach.
  • * To observe and quantify rapid changes in cometary nucleus rotation rates.
  • * To understand the implications of observed spin state changes for cometary evolution and stability.

Main Methods:

  • * Photometric observations of comet 41P/Tuttle-Giacobini-Kresák during its 2017 close approach.
  • * Analysis of apparent rotation period changes over a two-month interval (March-May 2017).
  • * Interpretation of observed rotation rate changes in the context of cometary outgassing torques.

Main Results:

  • * Comet 41P/Tuttle-Giacobini-Kresák exhibited a significant decrease in rotation rate.
  • * The apparent rotation period increased from 20 hours to over 46 hours within two months.
  • * This observed spin-down rate is an order of magnitude greater than previously measured values.

Conclusions:

  • * The observed rapid spin-down was caused by anomalously strong torques from aligned gas emission.
  • * Comet 41P/Tuttle-Giacobini-Kresák is likely in a distinct evolutionary phase.
  • * The nucleus's rotation may be approaching a point of instability, potentially leading to fragmentation or reorientation.