ATRONOMY – METEOR, COMET & MALL BODIE (20) CALCULATOR
Meteor Entry Speed
A precise tool.
What is the Meteor Entry Speed & How does it work?
When a meteoroid encounters Earthβs atmosphere it begins to decelerate due to aerodynamic drag. The observed speed at a given altitude is often lower than the true entry speed because the meteoroid has already lost kinetic energy. Understanding the entry speed is crucial for classifying meteors and estimating the energy released during atmospheric entry. The entry speed can be estimated from the observed speed and the entry angle (the angle between the meteoroidβs trajectory and the local horizontal). Assuming a straightβline trajectory and neglecting ablation, the relationship is given by the geometric projection of the velocity vector onto the atmospheric plane. Classifying meteors by entry speed helps scientists infer their origin: slow meteors (<β―11β―km/s) are typically of asteroidal origin, moderate meteors (11β25β―km/s) often come from Jupiterβfamily comets, and fast meteors (>β―25β―km/s) are associated with longβperiod or Halleyβtype comets. This classification also informs impact risk assessments.
v_{entry};=;frac{v_{obs}}{sintheta}
v_{entry} = true entry speed (km/s), v_{obs} = observed speed at altitude (km/s), ΞΈ = entry angle (degrees)
Parameters
Result
β
Frequently Asked Questions
How do I calculate the entry speed of a meteor?
Use the formula: Entry Speed = Observed Speed / cos(Entry Angle).
What is the significance of the entry angle in meteor calculations?
The entry angle affects how much the meteor decelerates due to atmospheric drag.
Why is it important to know the true entry speed of a meteor?
It helps classify meteors and estimate the energy released during atmospheric entry.
Can this calculator be used for any celestial body, not just Earth?
The basic principles apply, but specific atmospheric conditions vary by celestial body.
What factors can affect the observed speed of a meteor?
Factors include atmospheric density, meteoroid size, and composition.
How accurate is this calculator for estimating entry speeds?
Accuracy depends on precise measurements of observed speed and entry angle.
Is there a way to convert the entry speed from km/s to mph?
Yes, multiply the entry speed in km/s by 2236.94 to get mph.
Results are for informational purposes only and do not constitute professional advice.