What is the difference between a meteoroid, meteor, and meteorite?

A meteoroid is the solid grain or rock fragment traveling in outer space. A meteor is the streak of light produced when that grain burns up in Earth's atmosphere. A meteorite is any remnant fragment that survives atmospheric flight to strike the ground.

What does Zenithal Hourly Rate (ZHR) actually mean?

ZHR is a standardized theoretical calculation representing the number of meteors a single observer would see under ideal Bortle 1 skies with the shower's radiant positioned directly overhead at the zenith. Actual counts are virtually always lower.

Can I hear a meteor streak across the sky?

Standard sonic booms take minutes to travel down from 80 km. However, extremely bright bolides can produce electrophonic sounds—instantaneous crackling or hissing caused by very low frequency (VLF) radio waves inducing vibrations in nearby physical objects like wire glasses or pine needles.

Field Guidance Compendium

Observation FAQ

Practical guidance answering common technical questions on astronomical observing, camera preparation, and meteoroid properties.

A meteoroid is a small rocky or metallic body drifting through interplanetary space. A meteor is the visible streak of light generated when that particle enters Earth's atmosphere and vaporizes through shock compression. A meteorite is any surviving physical fragment that successfully decelerates and reaches Earth's surface.

ZHR is a standardized calculation assuming pristine dark skies (limiting magnitude +6.5) and the shower's radiant located directly at the zenith (90° overhead). In practical field observing, light pollution, lower radiant altitude, and cloud obstruction mean real-world counts typically run 30% to 50% below the published ZHR.

Ordinary acoustic shock waves travel at the speed of sound and take roughly two to four minutes to reach the ground from 80 km up. However, rare fireballs produce electrophonic sounds—instantaneous rustling or popping sounds caused by electromagnetic radiation generated by the plasma trail interacting with conductive objects (wire fences, eyeglasses, damp foliage) near the observer.

Commercial aircraft fly at cruising altitudes between 10 and 12 kilometers. The overwhelming majority of shower meteoroids completely ablate in the mesosphere between 80 and 105 kilometers altitude, far above aviation airspace.

Use manual exposure mode: Lens wide open (f/1.4–f/2.8), ISO set between 1600 and 3200, and exposure times between 15 and 25 seconds (governed by the 500 Rule to prevent star trailing). Lock a wired intervalometer to shoot continuous exposures throughout the peak 3-hour watch window.

Meteors streak across the sky in a fraction of a second to a few seconds, frequently demonstrating flares or deceleration before vanishing. Satellites move at a steady, uniform pace across several minutes without flashing, and airplanes display rhythmic, blinking navigation strobe lights.

Virtually never. Shower meteoroids are minuscule, fragile cometary dust grains that disintegrate completely high in the atmosphere. Ground-recovered meteorites almost exclusively originate from sporadic asteroidal fragments with significant mass and structural integrity.

High moisture content suspends micro-droplets in the air that scatter artificial ground lighting, multiplying light domes and degrading atmospheric transparency. Dry, elevated mountain sites provide vastly superior streak sharpness and contrast.