Tag Archives: flyby

Comet, 45P, Will Make 17th Closest (Known) Earth-Comet Encounter On February 11, 2017.

by Anura Guruge


Click to ENLARGE.

comets


Nothing to get too excited about. For a start, this same comet, 45P (where the ‘P’ indicates that it is ‘periodic’), flew by, even closer in 2011.

7.72 million mile separation is pretty respectable — 32x GREATER than the distance to the Moon.

So, don’t panic. Plus, it is quite a small comet, maybe a MILE across, max.

You may hear in the media that this the 8th closest approach by a comet. That is 8th closest as of 1950s when we really got good at measuring these distances — and you have to ALWAYS add, ‘KNOWN’.

This comet, 45P, even at this distance is unlikely to be naked eye visible!

So think of all the comet flybys our ancestors would have been oblivious to.

Also remember we are talking comets. Asteroids routinely whiz by much closer — as say did 2000EM26 in February 2014, with just 2.1 million mile separation.


Related posts:
++++ Check Category ‘astronomy’ >>>>
++++
Search ‘comets for posts from prior years >>>>


by Anura Guruge

Attractive, Animated Liberté, Fraternité, Égalité Google Doodle For Bastille Day — July 14, 2015.

Anura Guruge December 2014 thumbnail.
. .
.
.
.
.
by Anura Guruge


Last Google Doodles:
>> Pluto flyby.
>> Godzilla animator …

**** Check Category ‘Google Doodle’ (sidebar) for other Doodles >>>>


bastileday2015gd1
bastileday2015gd2

Click images to access the Google Doodles.

Permanent access, independent of date,
provided via the Google Doodle Archive.


bastileday2015gd3

Click to ENLARGE and read here. Use links above to access Google original.

Alas these very pretty Google Doodles restricted to France. Shame.
The whole World should see them.

Cute Google Doodle For NASA ‘New Horizons’ Flyby Of Pluto — July 14, 2015.

Anura Guruge December 2014 thumbnail.
. .
.
.
.
.
by Anura Guruge


plutogdtnmb12Last Google Doodles:
>> Godzilla animator …
>> FIFA, Algeria, Venezuela …

>> 1st clear image of Pluto

**** Check Category ‘Google Doodle’ (sidebar) for other Doodles >>>>


plutogdmain1
Click images to access the Google Doodles.

Permanent access, independent of date,
provided via the Google Doodle Archive.


plutogddesci1212

Click to ENLARGE and read here. Use links above to access Google original.

Given pretty much GLOBAL coverage– as is due.

Asteroid 2012 DA14 That Will Harmlessly Fly By Earth At A Distance Of 21,200 Miles On Friday, February 15, 2013.

Dec2013x125

..
.
by
Anura Guruge


Related posts:
++++
Check Category ‘Astronomy’ in the sidebar trench below >>>

Though many don’t realize this I spent quite a bit of time working on astronomy, these days even at the expense of Popes and cardinals.


Artistic rendition of 2012 DA14 passing by Earth on February 15, 2013.


Orbital diagram of the flyby.


This is Way Cool.

A dynamic orbit tracker from NASA’s JPL.
Try it out if you have Java installed.
Click to access JPL. [Orbit diagram], collapsed, will be at the top. You need Java.

Click to access JPL. [Orbit diagram], collapsed, will be at the top. You need Java.


It was discovered last year, on February 23, 2012, by a Spanish observatory.

It is an Earth-crosser asteroid that orbits the Sun every 366.2 days. Since it furthest point from the Sun, aphelion is beyond Earth’s orbit, crosses Earth’s orbital path twice a year. It has been probably been doing this for millions of years, though we now have precise data going back to August 1913.

It is not very big, about 160 ft across and weighing about 180,000 tons. It would do a fair amount of damage if it were to hit the Earth. It will not do so this year! But this is a record close approach. So much so that Earth’s gravity will perturb its orbital path reducing its orbital period by 51 days. That is a big deal.

There is an increasing chance that it might actually get around to hitting the Earth post 2080 — so 67 years from now. So our kids will have to keep an eye out. Asteroids of this size do hit the Earth every 1200 years or so. We are due. DA14 would not be the end of the World. It is too small. It could destroy a city. There was smaller asteroid that entered Earth’s atmosphere, above Russia, in 1908 and exploded in the sky before hitting the ground. It destroyed about 80 million trees over a 830 square mile area,