Talk:List of asteroid close approaches to Earth in 2015
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Albedo assumptions
editWhen estimating the size of a NEA I have used the common albedo range of 0.05 to 0.25 at JPL because I believe it is easier to understand than the more complicated to read MPC table that includes solutions for a highly reflective body. Using common albedos 0.05 to 0.25, for an object with absmag (H) 26.5, the object would be 13-30 meters in diameter unless Wikipedia wants to use more extreme albedo values which may only further confuse the average reader. Either way this article should be consistent with how size is estimated when the precise size is not known. -- Kheider (talk) 18:31, 8 June 2015 (UTC)
- My value assumed an albedo from 0.05 to 0.3, essentially the same as your source, but also takes into account the errors in absolute magnitude. exoplanetaryscience (talk) 18:38, 8 June 2015 (UTC)
- Reasonable enough even though the sigma on the absmag is probably also in error. -- Kheider (talk) 19:56, 8 June 2015 (UTC)
- The 0.50 albedo is probably intended for icy things like KBOs. Sagittarian Milky Way (talk) 16:34, 8 November 2015 (UTC)
- Reasonable enough even though the sigma on the absmag is probably also in error. -- Kheider (talk) 19:56, 8 June 2015 (UTC)
2015 HP116 close approach?
editOn the minor planet center list of close approaches in the next 33 years, it lists the asteroid 2015 HP116 as passing 0.002300 AU (~0.89 LD) from the Earth. However, it is not listed on the JPL database, or the MPC itself. Can anyone give any more data on this object? 107.184.131.229 (talk) 04:19, 4 October 2015 (UTC)
- That's no moon. It is the Gaia (spacecraft). See also: http://www.minorplanetcenter.net/mpec/K15/K15HC5.html -- Kheider (talk) 04:29, 4 October 2015 (UTC)
Bright light in the sky
editJust saw a asteroid or something in the 2602:30A:C0DB:5C40:E1EF:BEA0:54CD:ED1F (talk) 02:32, 8 November 2015 (UTC)sky What was it. amonusko@yahoo.com Tony monusko 11/07/2015. 1800. Was the event
- Probably just a Taurid fireball or a Satellite flare. You have not described what you saw. Given the news, it was probably the Southern California Trident SLBM test South of Point Mugu launched from the USS Kentucky (SSBN-737). -- Kheider (talk) 02:38, 8 November 2015 (UTC)
Updating Table Format in line with 2018 close approaches page
editHi Wikipedians. Carrying out some formatting changes in line with the 2018 close approaches page. Specifically:
- using the natty reference style from that page,
- adding discovery date column
- reducing font size so that table fits one line without ordinary cells wrapping — Preceding unsigned comment added by Rafflesgluft (talk • contribs) 20:02, 14 July 2018 (UTC)