# Why do we only have one major meteor shower from 3200 Phaethon?

When talking to my son about the Geminid meteor shower tonight, we read up on 3200 Phaethon, and were curious: why is there only one meteor shower from 3200 Phaethon, and not two? Given its orbit, the Earth crosses the sunward orbit of 3200 Phaethon in December, and the after-sun orbit the next September or October (see this orbital diagram on wikipedia for example.)

Why does only the one side of the orbit have a major meteor shower, and not the other (as far as I know, anyway)? This seems true for any of the major showers – Swift-Tuttle also crosses our orbit twice as well, of course, once in (northern hemisphere) spring and once in August, as must any other comet (assuming none are perfect tangents to our orbit, which seems unlikely). Why does only one side of the orbit cause a meteor shower?

And, why it is it not always the same side of its orbit – 3200 Phaethon causes the shower heading towards the sun, while Swift-Tuttle causes the Perseid shower after it’s past the Sun and is headed back out? (I’d thought perhaps the shower was caused by debris from the sun approach at first, but of course that mustn’t be the case if I read the orbital diagram properly; and then later I thought that maybe the Sun vacuumed up the debris, but then Swift-Tuttle has the opposite result.)

Is it simply orbits in three dimensions (and the comet/asteroid coincidentally crosses Earth’s orbit once on Earth’s orbital plane, but the other crossing is on a different plane)? Would both sides of the orbit produce similar effects, if the comet was in precisely the same plane as Earth? Or are there "dusty" and "clean" portions of the asteroid’s/comet’s orbits?

Astronomy Asked on December 28, 2020

Note the short straight lines that hang down (or stick up) from the orbital track of 3200 Phaethon you reference.

These indicate the distance above or below the plane of earth's orbit (the ecliptic) 3200 Phaethon is at that point.

So 3200 Phaethon passes well above Mars' orbital track and passes through the Earth's orbital track (just about)

Then it passes under Venus, under Mercury, makes a U-turn around the Sun, and passes back over Mercury, Venus Earth, and Mars.

So your supposition in the last paragraph is correct.

Correct answer by DJohnM on December 28, 2020

## Related Questions

### What observatories provide data similar to USNO?

0  Asked on November 27, 2021 by sigrlami

### Basic explanation of baryon acoustic oscillations; what if anything is actually oscillating?

2  Asked on November 27, 2021

### How many satellites orbit their planet faster than the planet rotates?

2  Asked on November 22, 2021

### How can the Earth and the Moon be in synchronous rotation if the Moon won’t be in geostationary orbit?

2  Asked on November 22, 2021

### What is the accepted theory as to why Uranus’ axis is tilted so severely?

3  Asked on November 20, 2021

### Is it possible to find what crater the Mars meteorites come from?

1  Asked on November 20, 2021

### Gravitational wave detection time difference between LIGO Livingston and LIGO Hanford

5  Asked on November 19, 2021 by gollum

### Does Saturn raise tides on Titan’s lakes?

2  Asked on November 17, 2021 by christietowin

### Where should I be looking to see Neowise in southern Sweden?

1  Asked on November 17, 2021

### Density of a sunspot compared to the surrounding photosphere?

0  Asked on November 15, 2021

### Which stellar properties can we describe as “first principles” in which we can derive the rest?

2  Asked on November 13, 2021

### Will NEOWISE be known as the Great Comet of 2020?

2  Asked on November 8, 2021

### Seeing comet NEOWISE?

5  Asked on November 8, 2021

### How much of the Sun’s disk must be covered for a visible shadow to be cast?

1  Asked on November 5, 2021 by user267545

### Where do we have it from that the Moon is migrating away from Earth?

2  Asked on September 28, 2021

### What are Kepler’s laws (as he wrote them)?

1  Asked on September 28, 2021 by profrob

### Charged black holes selective eaters

0  Asked on September 28, 2021 by helena-wells

### Is it true that we see the center of the milky-way for only half of the year?

2  Asked on September 28, 2021 by riorio

### Which moons do have neutrospheres?

0  Asked on September 28, 2021

### Were radio spectroscopic observations ever used to first measure a distance successfully?

1  Asked on September 28, 2021 by questionhang