Talk:1566 Icarus

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Is Icarus Getting Closer?[edit]

Given the decreasing distances that Icarus seems to be making during it's pass-by's, Is it possible to calculate the paths of both Earth & Icarus to see whether it will impact with us in the future?

Radar spotting[edit]

Icarus was one of (the?) first asteroid to be observed by radar from earth. Ref: http://echo.jpl.nasa.gov/asteroids/PDS.asteroid.radar.history.html Maybe someone with better knoledege could put this in the article? 83.252.28.234 (talk) 04:09, 3 May 2011 (UTC)[reply]

General relativity[edit]

Precession, caused by general relativity, in the case of Icarus of 10.05 seconds of arc per Julian century has been mentioned. — Preceding unsigned comment added by 78.105.0.33 (talk) 15:21, 26 July 2012 (UTC)[reply]

Why is Gm used here and practically nowhere else in Astronomy articles?[edit]

The term Gm is practically never seen in general encyclopedic material. What's wrong with saying millions of kilometers, which along with the AU is the normal expression of interplanetary distances? — Preceding unsigned comment added by 174.73.22.113 (talk) 03:28, 10 September 2014 (UTC)[reply]

Icarus perihelion distance record[edit]

The article states that Icarus was the record holder for closest perihelion distance until the discovery of 2000 BD19 in 2000. This seems to be erronous since at least the asteroid 1995 CR has a perihelion distance of 0.1193 AU, which is much closer than Icarus. Should that be corrected? Renerpho (talk) 22:32, 11 June 2015 (UTC)[reply]

Edit. As the asteroid 1995 CR was only observed at the opposition in 1995 and only recently re-discovered (in 2014), I wondered if the orbital elements would have been known with the 1995 observations only. I checked that by calculating the orbit myself (using only 1995 observations), finding that the perihelion distance was known to be 0.11911 +/-0.00017, fairly accurate...Renerpho (talk) 22:45, 11 June 2015 (UTC)[reply]

Good catch. 1995 CR was observed from 1995 02 03 through 1995 02 23 giving it a 20 day observation arc with many observations. But 3200 Phaethon (1983 TB) with q=0.14 upstaged 1566 Icarus before 1995 CR and 2000 BD19. -- Kheider (talk) 16:00, 16 June 2015 (UTC)[reply]