Talk:99942 Apophis

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2013 Pass of Apophis

Novosti 2009-02-25 (http://en.rian.ru/analysis/20090225/120298367.html) says "In 2012, Apophis will pass close enough to Earth, enabling scientists to more accurately calculate its 2029 orbit." If so, ISTM worth giving date and distance of that pass, and of any other comparatively near passes before the important ones. 82.163.24.100 (talk) 18:59, 25 February 2009 (UTC)[reply]

See Talk:99942_Apophis/Archive_2#2016_Venus_encounter for more details.. -- Kheider (talk) 19:24, 25 February 2009 (UTC)[reply]

Somebody should add this to the article. http://news.yahoo.com/s/ap/20091230/ap_on_re_eu/eu_russia_asteroid_encounter I don't know how and don't want to mess it up.

Some minor details in the naming section

This topic is in need of attention from an expert on the subject.

The section or sections that need attention may be noted in a message below.

The statement of Apophis being the most persistent Stargate villain, although in the article Goa'uld characters in Stargate is stated that Ba'al is the longest-running villain in Stargate show. 195.39.74.163 (talk) 17:21, 13 July 2009 (UTC)[reply]

The article cites a supporting source. Because of this, the article should be read as asserting that

Although the Greek name for the Egyptian god may be appropriate, Tholen and Tucker — two of the co-discovers of the asteroid — are reportedly fans of the TV series Stargate SG-1. The show's most persistent villain is an alien also named for the Egyptian god." (Supporting source: Bill Cooke (August 18, 2005). "Asteroid Apophis set for a makeover". Astronomy Magazine. {{cite journal}}: Unknown parameter |urldate= ignored (help).)

As that cited supporting source does indeed support the assertion, the article should not be changed to make a contrary assertion; though information about contrary assertions made by other sources (with those sources being cited, of course) might be added to the article. Or, alternatively, perhaps this bit of trivia might be left out of the article. See WP:V, WP:CITE. Wtmitchell (talk) (earlier Boracay Bill) 23:38, 14 July 2009 (UTC)[reply]

Aldrin Manned Mission Plan

During the lecture for the 40th Apollo 11 Anniversary, Buzz Aldrin proposed a manned mission, here's a powerpoint slide of his which shows it, if someone wants to add something to the missions section: http://www.nasawatch.com/archives/2009/07/buzz_aldrins_on.html —Preceding unsigned comment added by Jafafa Hots (talk • contribs) 10:43, 20 July 2009 (UTC)[reply]

Which is it?

"Apophis’s brightness will peak at magnitude 3.3, with a maximum angular speed of 42° per hour. The maximum apparent angular diameter will be ~2 arcseconds, so that it will be barely resolved by telescopes not equipped with adaptive optics."

"On that date, it will become as bright as magnitude 3.3 (visible to the naked eye from rural and some darker suburban areas, visible with binoculars from most locations"

According to the Apparent_magnitude page, the second quote would appear to be the correct one. Does someone want to take a shot at fixing this? —Preceding unsigned comment added by 76.21.3.245 (talk) 12:53, 14 August 2009 (UTC)[reply]

The resolving power of a telescope has nothing to do with the limiting apparent magnitude. These are separate characteristics. It is the difference between seeing an object (magnitude) and resolving it as a disc. -- Kheider (talk) 15:08, 14 August 2009 (UTC)[reply]

1 in 233,000 chance

I rv'ed an edit showing a 1 in 250,000 chance of a collision. The auto generated link at NEO does show the odds as only 1 in 233,000 (2036-04-13.37; 4.3e-06), but since it is an auto generated page I think it is better if we stay with a human created reference. Besides there have been no new observations of the asteroid since 2008-01-09. -- Kheider (talk) 18:31, 7 October 2009 (UTC)[reply]

As per an October 7, 2009 NASA Release, chances of impact in 2036 have been recalculated to be 1 in 250,000. So, I undid your edit and added the reference. Darry2385 (talk) 19:04, 7 October 2009 (UTC)[reply]

Ah good. Nice to know the automated program is accurate. :) -- Kheider (talk) 19:28, 7 October 2009 (UTC)[reply]

Easter Sunday

The event of 2036 will occur on Gregorian Easter Sunday (Orthodox Easter Sunday will be a week later) - that seems worth mentioning.

Could there be a table of all nearest approaches this century, with brief details including miss distance, visible magnitude, GMT of pass, terrestrial nadir of pass, with uncertainties?

82.163.24.100 (talk) 09:57, 8 October 2009 (UTC)[reply]

NEODyS Close Approaches (ref #13) has the info you are looking for. -- Kheider (talk) 10:11, 8 October 2009 (UTC)[reply]

Impact risk path

I have a question. According to the impact risk there is a path that covers a 20 hour earth turn rate. (I would think the curved path indicates this is a time lag due to how the earth is turned).

At the speed the earth is revolving around the sun how can predictions of the accuracy they are claiming be made? Just wondering. —Preceding unsigned comment added by 207.160.238.250 (talk) 16:08, 21 December 2009 (UTC)[reply]

Using Newtonian mechanics, the errors in the known trajectory of Apophis result in slightly different arrival times and impact points. If we knew the exact orbit of Apophis we would know when and where it would hit. When Apophis gets very close to the Earth there will be significant perturbations to the asteroid. -- Kheider (talk) 21:45, 21 December 2009 (UTC)[reply]

This seems to be based on this. Wtmitchell (talk) (earlier Boracay Bill) 00:50, 23 December 2009 (UTC)[reply]

Impact calculations: solid rock vs. rubble pile

I was wondering how the impact calculations would differ if the asteroid Apophis turns out to be a big rubble pile, its center of mass would change during close approach and rotation rate? Also if Apophis turns out to be a rubble pile that breaks apart on close aproach to Earth,How much more of a threat would it be to multible geostationary satellites? Jalanp2 (talk) 18:26, 8 November 2009 (UTC)[reply]