Talk:J002E3

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A fact from J002E3 appeared on Wikipedia's Main Page in the Did you know column on 23 December 2004. The text of the entry was as follows:

Did you know... that J002E3 was at first thought to be a new moon of the Earth when discovered in 2002 but later found to be the third stage of the Apollo 12 Saturn V?

A record of the entry may be seen at Wikipedia:Recent additions/2004/December.

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Image[edit]

Are there any images that better compliment the article than this one? it seems rather roundabout.

When I wrote the article I looked for some GFDL or PD images but couldn't find any. This image nicely illustrates though what J002E3 is (apart from the SLA panels) and also showcases what I think is a nice image. If anyone out there knows of any GFDL or PD images feel free the add them. Evil Monkey → Talk 03:00, Dec 27, 2004 (UTC)

FWIW, NIX only has one image of the S-IVB stage after launch, AS12-50-7328. It's not any good for this. Shimgray | talk | 00:31, 26 December 2005 (UTC)[reply]

The current image is fine. The SLA panels did not stay attached to the stage. JustinTime55 (talk) 15:34, 17 September 2014 (UTC)[reply]

Cruithne[edit]

"no other natural object apart from the Moon is in orbit around the Earth" - is this true? Can Cruithne not be described as accompanying the Earth in its orbit? TheVenerableBede 11:13, 22 Dec 2004 (UTC)

[1]

According to 3753 Cruithne, it "shares Earth's orbit, but does not actually orbit the Earth. Instead, it follows a spiralling path that moves along the Earth's orbit". --Plutor 14:45, 22 Dec 2004 (UTC)

Noted! TheVenerableBede 15:15, 22 Dec 2004 (UTC)

I added it as a "see also" before reading this! Glad to see that it is not just me... -- ALoan (Talk) 15:49, 22 Dec 2004 (UTC)

However, "Clouds of dust, even fainter than the notoriously weak gegenschein, are also present in the L4 and L5 of the Earth-Moon system." -- Lagrange point. If I understand correctly, this means those dust particles *are* in orbit around the Earth. --DavidCary 04:43, 28 Dec 2004 (UTC)

An interesting point and something I'd never heard of. After a bit of research I found that they were called Kordylewski Clouds and are thought to be transient events. I've added a small note about them and am planning to write an article about them now. Evil Monkey → Talk 06:24, Dec 28, 2004 (UTC)

An anonymous user added "...and the sun..." to the sentence about the moon being in orbit of the earth. Do we have a geocentrist infiltrator, or is there something to this? - Montréalais 18:21, 23 Dec 2004 (UTC)

I think he's just experimenting. He also edited Wikipedia:Introduction and then edited it straight back. I'll give him a test notice. DJ Clayworth 18:22, 23 Dec 2004 (UTC)

Title[edit]

Should this article not be called S-IVB-507? Sine we figured out what it is, the name J002E3 is a bit of a distraction. The S-IVB-507 article could talk about the part's manufacture, testing, and flight as well as its re-discovery as J002E3. It would also be more appropriate then to include pictures of S-IVB-507 from a time when it was much closer to the camera. -- ke4roh (talk) 17:04, 18 February 2011 (UTC)[reply]

I'd pass on the rename. The article discusses the object as discovered floating through space, and the reason that the engine is notable is specifically because it is space debris sighted during astronomical observations. Thus it seems most suited that the article use the title when rediscovered. That the other title is a redirect seems an acceptable solution. SchuminWeb (Talk) 23:11, 18 February 2011 (UTC)[reply]

Why was it called "J002E3"? For a supposed natural satellite of the Earth, "S/2002 E 3" would have seemed more logical. Lanthanum-138 (talk) 13:29, 9 July 2011 (UTC)[reply]

(Answering for myself, almost six years later.) It must be a temporary internal designation; once this was known to almost certainly be artificial, it would surely not have gotten an official temporary designation (and what would be the first and second satellites of Earth found in 2002, then?). Double sharp (talk) 13:19, 24 June 2017 (UTC)[reply]

Reimpact risk edit[edit]

I added the reimpact risk edit because I'm genuinely curious about the risk if/when this object impacts earth. I'd presume that it'd be roughly the same as lofting a 10 tonne object 60km or so and then dropping it. That is, I'd guess it would be substantial, but smaller than nuclear or even conventional weapons, but smaller than a regular 10 tonne meteor impact from another trajectory. If someone with better knowledge could set my mind at rest about a 10 tonne meteor we might have hurled at ourselves.... Thanks. — Preceding unsigned comment added by 173.199.245.37 (talk) 04:49, 4 April 2013 (UTC)[reply]

an object of that mass would just burn up in the atmosphere. It's not very big anyway. 86.180.14.20 (talk) 15:35, 6 January 2014 (UTC)[reply]

There's a phrase that needs to be rewritten: "These objects entered from low Earth orbit or ballistic trajectory, with less energy than J002E3 might possibly have if it were to enter from Solar orbit." — Preceding unsigned comment added by Gustavoexel (talk • contribs) 08:25, 7 June 2016 (UTC)[reply]

Identification of paint?[edit]

The article says "Further examination revealed that the surface appeared to contain the paint ..." -- im tempted to insert a request for citation -- do anybody know how that was done? Sorenriise (talk) 02:23, 3 August 2014 (UTC)[reply]

" ...spectral observations of the object indicated a strong correlation of absorption features with a combination of human-made materials including white paint..." I came to this page from the page about Titanium Dioxide, where it explicitly states ... well, why don't you read it. Last sentence of the paragraph called "Pigment".

External links modified (January 2018)[edit]

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J002E3 as a meme[edit]

I find it noteable one can find J002E3's trajectory in a .gif meme related to "the joke" vs "you" situation of missing joke.

Interestingly, in l33t-speak, "joke" can be obfuscated into "jooqee", while 0 can be substitute O, 3 can substitute 3, and 2 looks like calligraphic Q.

Earth MOID[edit]

Since the S-IVB stage is an (artificial) quasi-moon of Earth, can't we figure out its Earth MOID, that is, how close to Earth it may come during its current orbit? And it will come close to Earth in the 2040s again, so there should be some estimate how close it would come just like Apophis' perigee is predicted quite precisely now. Glasfaser Wien (talk) 14:00, 17 July 2023 (UTC)[reply]