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What is a record-setting asteroid and how will Wikipedia define the list(s)? Is it only asteroids/meteoroids that set a new record such as 2011 CQ1 being the closest, 2004 FU162 being the very early on, and 2008 TS26 being the smallest (based on absolute magnitude)? Is an object like 2012 KT42 worthy of mention since it technically does not set any new close-approach record? -- Kheider ( talk) 19:39, 30 May 2012 (UTC)
The timeline section is confusing. First, the article is about record-setting close approaches. Are these supposed to be approaches that were closer than any previously known approach? It doesn't seem to be that way. Are they approaches that were larger than previous ones? Not clear. Secondly, the timeline is in reverse chronological order, which doesn't make sense. Bubba73 You talkin' to me? 03:08, 17 February 2013 (UTC)
The "small asteroids" table doesn't make sense either. For instance, the table is in order by how close the approach was. But there was one of 20,400 km in Nov 2009 but a 34,000 km one is listed in Feb 2013. Why is this second one listed - it didn't break the record for close approach. Bubba73 You talkin' to me? 03:15, 17 February 2013 (UTC)
I propose that "record-setting" be removed from the title and the article just list close approaches. What sets a record is ambiguous, because we are talking about both distance and size. Also, a timeline doesn't make sense as far as record breaking. Bubba73 You talkin' to me? 18:54, 19 February 2013 (UTC)
Done
Bubba73
You talkin' to me?
02:44, 22 February 2013 (UTC)
I'm wondering if the tables need to be reorganized. Perhaps have a list of close approaches (leave ones that graze or impact in their own tables). Have it listed in chronological order, but make it a sortable table so the reader could sort by the size or distance columns and look at record breakers. Bubba73 You talkin' to me? 16:28, 22 February 2013 (UTC)
What about the newly discovered 2013 LR6, which passed nearby June 8, 2013? Bubba73 You talkin' to me? 00:38, 9 June 2013 (UTC)
There will be a live broadcast on 5 June 2014 of the asteroid 2014 HQ124. This may please be added by an interested editor. AshLin ( talk) 02:28, 6 June 2014 (UTC)
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what is the closest comet or metor to earth is it going to hit earth.
Rafflesgluft ( talk) 21:02, 9 July 2018 (UTC) It is not clear to me what the bar graph at the start of the article is trying to show. It seems to be trying to show how many asteroids were in opposition when they were discovered. The extent of opposition is not defined: does it mean anywhere on the night side of the planet i.e. between 90 and 270 degrees elongation or does it mean at or close to 180 degrees, if so how close? For any definition of opposition, this data seems to be wrong because notable asteroid 99942 Apophis (2004 MN4) was discovered at just 55.7 degrees elongation. Yet the graph records that during 2004, all close approach asteroids were discovered in opposition. Therefore this data is either incorrect, or more likely showing something completely different. As no references are given for the graph itself, it's not clear where the data has come from. Does anybody understand what this graph is showing?
Finally, for non-technical readers this graph will certainly be hard to understand since the term "opposition" is not in common usage. I wonder if it might be better to represent this data by showing the distribution of angles (and ranges?) that asteroids were discovered at. Comments welcome.
Hi,
I'm about to remove 2011 ES4 from the "Largest per year" list. There are a couple of reasons.
The introductory paragraph says "From the lists in the first section, these are the largest known asteroids per year that approach Earth within one LD". However firstly this asteroid is not contained in the lists in the first section, and secondly it isn't predicted to come within 1 LD of earth in the year 2020. It looks as though a mistake has been made when reading the data in the given reference, because the object is predicted to come close to the moon in 2020, but not Earth. In fact the reference given ( [1]) doesn't indicate a close approach to Earth that year at all. This is probably partly due to the high uncertainty (7). However, looking at a second source (NEODyS [1]), which calculates close approaches using an independent method, we can see that the predicted nominal closest approach distance is 0.0665144 AU i.e. 995 thousand km, not within 1LD.
We can double check this by looking at the NASA JPL close approaches page [2]. If you search for Future Only objects with nominal distance < 1 LD and no H limit, this asteroid does not appear in the list, neither does anything else for the year 2020.
For reference here is the line I am about to delete:
|- | 2020 || 2020-09-01 || {{mpl|2011 ES|4}} || align="center"|78.9 ||align="center"|0.21 ||align="center"|{{sort|.015|15–49 meters}} ||align="center"|25.7<ref name="2011ES4">{{cite web |url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2011ES4;cad=1#cad |title=JPL Small-Body Database Browser: (2011 ES4) |type=last observation: 2011-03-06}}</ref>
Rafflesgluft ( talk) 18:12, 5 September 2018 (UTC)
UPDATE: 2011 ES4 has reappeared in the NASA JPL NEOS list, although it still has uncertainty 7. I am therefore planning to re-add it, but with a note on the uncertainty. Similarly, there are now two predicted close approaches in 2032, including 2008 DB, which has been re-observed and now has uncertainty zero. Rafflesgluft ( talk) 13:23, 24 December 2019 (UTC)
Added 2018 RY1 to list of closest asteroids per year. 2018 RY1 is due to approach Earth within 1LD in 2027. Note however the orbit model is highly uncertain (uncertainty 8) at the time of writing. Therefore if you are viewing this talk page and have time to check if there have been any further observations of 2018 RY1 that have updated its orbit, please go ahead, and update the list with the new data. Currently [3] has:
Date/time: 2027-Oct-15 21:44, uncertainty 1 day, 22 hours 7 minutes
Last observation: 2018-09-13
It will be brighter than magnitude 23 until the end of September 2018 so it is possible further observations will be made in the near future. If not, the next close approach is in 2021, when it will be brighter than magnitude 23 from August 9th through till Oct 15th 2021
Rafflesgluft ( talk) 13:27, 14 September 2018 (UTC)
|- | [[List of asteroid close approaches to Earth in 2027|2027]] || bgcolor="#79d8ff" | 2027-10-15 || bgcolor="#79d8ff" | 2018-09-07 || bgcolor="#79d8ff" | {{mp|2018 RY|1}} || bgcolor="#79d8ff" align="center"|203.1 || bgcolor="#79d8ff" align="center"|0.53 || bgcolor="#79d8ff" align="center"|35-79 || bgcolor="#79d8ff" align="center"|24.4<ref name="2018RY1">{{cite web |url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2018RY1;cad=1#cad |title=JPL Small-Body Database Browser: (2018 RY1) |type=last observation: 2018-09-13}}</ref> Rafflesgluft ( talk) 19:08, 18 September 2018 (UTC)
I have just added the 2032 close approach of 2008 DB. This is listed in the NASA JPL NEOS page if you search for all future approaches closer than 1LD. However it is missing from the close approach data for the asteroid itself, which instead only lists the close approach of the asteroid to the moon. The close approach to the moon listed on the close approach page has a different close approach distance to that listed on the NEOs close approaches page. To double check what is going on, I got the ephemeris from Horizons and can see that there is indeed a close approach to Earth on that day. I have therefore added it to the table. Below is the ephemeris (delta column is the close approach distance, which is in AU):
******************************************************************************* Ephemeris / WWW_USER Tue Dec 24 09:04:20 2019 Pasadena, USA / Horizons ******************************************************************************* Target body name: (2008 DB) {source: JPL#16} Center body name: Earth (399) {source: DE431} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 2032-Aug-14 14:45:00.0000 UT Stop time : A.D. 2032-Aug-14 15:00:00.0000 UT Step-size : 1 minutes ******************************************************************************************************* Date__(UT)__HR:MN R.A._(ICRF/J2000.0)_DEC APmag delta deldot S-O-T /r S-T-O ******************************************************************************************************* $$SOE 2032-Aug-14 14:45 03 13 13.43 -53 10 35.3 12.96 0.00083386423011 -0.2131961 104.8814 /L 75.0733 2032-Aug-14 14:46 03 14 34.99 -53 11 12.8 12.96 0.00083378369805 -0.1883957 104.6792 /L 75.2755 2032-Aug-14 14:47 03 15 56.61 -53 11 46.9 12.97 0.00083371311393 -0.1635884 104.4770 /L 75.4777 2032-Aug-14 14:48 03 17 18.28 -53 12 17.4 12.98 0.00083365248035 -0.1387751 104.2747 /L 75.6799 2032-Aug-14 14:49 03 18 39.98 -53 12 44.5 12.98 0.00083360179949 -0.1139568 104.0724 /L 75.8821 2032-Aug-14 14:50 03 20 01.72 -53 13 08.1 12.99 0.00083356107323 -0.0891343 103.8701 /L 76.0844 2032-Aug-14 14:51 03 21 23.50 -53 13 28.2 13.00 0.00083353030303 -0.0643085 103.6678 /L 76.2867 2032-Aug-14 14:52 03 22 45.29 -53 13 44.8 13.00 0.00083350949003 -0.0394804 103.4654 /L 76.4890 2032-Aug-14 14:53 03 24 07.11 -53 13 57.9 13.01 0.00083349863499 -0.0146508 103.2631 /L 76.6914 2032-Aug-14 14:54 03 25 28.94 -53 14 07.5 13.02 0.00083349773829 0.0101792 103.0607 /L 76.8937 2032-Aug-14 14:55 03 26 50.77 -53 14 13.6 13.02 0.00083350679997 0.0350089 102.8583 /L 77.0960 2032-Aug-14 14:56 03 28 12.61 -53 14 16.2 13.03 0.00083352581969 0.0598374 102.6560 /L 77.2984 2032-Aug-14 14:57 03 29 34.44 -53 14 15.3 13.04 0.00083355479675 0.0846636 102.4536 /L 77.5007 2032-Aug-14 14:58 03 30 56.27 -53 14 10.9 13.05 0.00083359373010 0.1094867 102.2513 /L 77.7030 2032-Aug-14 14:59 03 32 18.08 -53 14 03.0 13.05 0.00083364261829 0.1343058 102.0489 /L 77.9053 2032-Aug-14 15:00 03 33 39.87 -53 13 51.6 13.06 0.00083370145956 0.1591200 101.8466 /L 78.1075 $$EOE *******************************************************************************************************
Rafflesgluft ( talk) 17:28, 24 December 2019 (UTC)
Should anyone add the 1994 PC1 asteroid ? It will pass over (5x Lunar Distance) from the earth in 18 January 2022. SLeFiNho ( talk) 09:49, 17 January 2022 (UTC)
Can someone please fix the distance from Earth? I only copy-pasted it from 2018 LA. Thank you! 72.203.63.234 ( talk) 04:25, 3 April 2022 (UTC)
This is the
talk page for discussing improvements to the
List of asteroid close approaches to Earth article. This is not a forum for general discussion of the article's subject. |
Article policies
|
Find sources: Google ( books · news · scholar · free images · WP refs) · FENS · JSTOR · TWL |
![]() | This article is rated List-class on Wikipedia's
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What is a record-setting asteroid and how will Wikipedia define the list(s)? Is it only asteroids/meteoroids that set a new record such as 2011 CQ1 being the closest, 2004 FU162 being the very early on, and 2008 TS26 being the smallest (based on absolute magnitude)? Is an object like 2012 KT42 worthy of mention since it technically does not set any new close-approach record? -- Kheider ( talk) 19:39, 30 May 2012 (UTC)
The timeline section is confusing. First, the article is about record-setting close approaches. Are these supposed to be approaches that were closer than any previously known approach? It doesn't seem to be that way. Are they approaches that were larger than previous ones? Not clear. Secondly, the timeline is in reverse chronological order, which doesn't make sense. Bubba73 You talkin' to me? 03:08, 17 February 2013 (UTC)
The "small asteroids" table doesn't make sense either. For instance, the table is in order by how close the approach was. But there was one of 20,400 km in Nov 2009 but a 34,000 km one is listed in Feb 2013. Why is this second one listed - it didn't break the record for close approach. Bubba73 You talkin' to me? 03:15, 17 February 2013 (UTC)
I propose that "record-setting" be removed from the title and the article just list close approaches. What sets a record is ambiguous, because we are talking about both distance and size. Also, a timeline doesn't make sense as far as record breaking. Bubba73 You talkin' to me? 18:54, 19 February 2013 (UTC)
Done
Bubba73
You talkin' to me?
02:44, 22 February 2013 (UTC)
I'm wondering if the tables need to be reorganized. Perhaps have a list of close approaches (leave ones that graze or impact in their own tables). Have it listed in chronological order, but make it a sortable table so the reader could sort by the size or distance columns and look at record breakers. Bubba73 You talkin' to me? 16:28, 22 February 2013 (UTC)
What about the newly discovered 2013 LR6, which passed nearby June 8, 2013? Bubba73 You talkin' to me? 00:38, 9 June 2013 (UTC)
There will be a live broadcast on 5 June 2014 of the asteroid 2014 HQ124. This may please be added by an interested editor. AshLin ( talk) 02:28, 6 June 2014 (UTC)
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what is the closest comet or metor to earth is it going to hit earth.
Rafflesgluft ( talk) 21:02, 9 July 2018 (UTC) It is not clear to me what the bar graph at the start of the article is trying to show. It seems to be trying to show how many asteroids were in opposition when they were discovered. The extent of opposition is not defined: does it mean anywhere on the night side of the planet i.e. between 90 and 270 degrees elongation or does it mean at or close to 180 degrees, if so how close? For any definition of opposition, this data seems to be wrong because notable asteroid 99942 Apophis (2004 MN4) was discovered at just 55.7 degrees elongation. Yet the graph records that during 2004, all close approach asteroids were discovered in opposition. Therefore this data is either incorrect, or more likely showing something completely different. As no references are given for the graph itself, it's not clear where the data has come from. Does anybody understand what this graph is showing?
Finally, for non-technical readers this graph will certainly be hard to understand since the term "opposition" is not in common usage. I wonder if it might be better to represent this data by showing the distribution of angles (and ranges?) that asteroids were discovered at. Comments welcome.
Hi,
I'm about to remove 2011 ES4 from the "Largest per year" list. There are a couple of reasons.
The introductory paragraph says "From the lists in the first section, these are the largest known asteroids per year that approach Earth within one LD". However firstly this asteroid is not contained in the lists in the first section, and secondly it isn't predicted to come within 1 LD of earth in the year 2020. It looks as though a mistake has been made when reading the data in the given reference, because the object is predicted to come close to the moon in 2020, but not Earth. In fact the reference given ( [1]) doesn't indicate a close approach to Earth that year at all. This is probably partly due to the high uncertainty (7). However, looking at a second source (NEODyS [1]), which calculates close approaches using an independent method, we can see that the predicted nominal closest approach distance is 0.0665144 AU i.e. 995 thousand km, not within 1LD.
We can double check this by looking at the NASA JPL close approaches page [2]. If you search for Future Only objects with nominal distance < 1 LD and no H limit, this asteroid does not appear in the list, neither does anything else for the year 2020.
For reference here is the line I am about to delete:
|- | 2020 || 2020-09-01 || {{mpl|2011 ES|4}} || align="center"|78.9 ||align="center"|0.21 ||align="center"|{{sort|.015|15–49 meters}} ||align="center"|25.7<ref name="2011ES4">{{cite web |url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2011ES4;cad=1#cad |title=JPL Small-Body Database Browser: (2011 ES4) |type=last observation: 2011-03-06}}</ref>
Rafflesgluft ( talk) 18:12, 5 September 2018 (UTC)
UPDATE: 2011 ES4 has reappeared in the NASA JPL NEOS list, although it still has uncertainty 7. I am therefore planning to re-add it, but with a note on the uncertainty. Similarly, there are now two predicted close approaches in 2032, including 2008 DB, which has been re-observed and now has uncertainty zero. Rafflesgluft ( talk) 13:23, 24 December 2019 (UTC)
Added 2018 RY1 to list of closest asteroids per year. 2018 RY1 is due to approach Earth within 1LD in 2027. Note however the orbit model is highly uncertain (uncertainty 8) at the time of writing. Therefore if you are viewing this talk page and have time to check if there have been any further observations of 2018 RY1 that have updated its orbit, please go ahead, and update the list with the new data. Currently [3] has:
Date/time: 2027-Oct-15 21:44, uncertainty 1 day, 22 hours 7 minutes
Last observation: 2018-09-13
It will be brighter than magnitude 23 until the end of September 2018 so it is possible further observations will be made in the near future. If not, the next close approach is in 2021, when it will be brighter than magnitude 23 from August 9th through till Oct 15th 2021
Rafflesgluft ( talk) 13:27, 14 September 2018 (UTC)
|- | [[List of asteroid close approaches to Earth in 2027|2027]] || bgcolor="#79d8ff" | 2027-10-15 || bgcolor="#79d8ff" | 2018-09-07 || bgcolor="#79d8ff" | {{mp|2018 RY|1}} || bgcolor="#79d8ff" align="center"|203.1 || bgcolor="#79d8ff" align="center"|0.53 || bgcolor="#79d8ff" align="center"|35-79 || bgcolor="#79d8ff" align="center"|24.4<ref name="2018RY1">{{cite web |url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2018RY1;cad=1#cad |title=JPL Small-Body Database Browser: (2018 RY1) |type=last observation: 2018-09-13}}</ref> Rafflesgluft ( talk) 19:08, 18 September 2018 (UTC)
I have just added the 2032 close approach of 2008 DB. This is listed in the NASA JPL NEOS page if you search for all future approaches closer than 1LD. However it is missing from the close approach data for the asteroid itself, which instead only lists the close approach of the asteroid to the moon. The close approach to the moon listed on the close approach page has a different close approach distance to that listed on the NEOs close approaches page. To double check what is going on, I got the ephemeris from Horizons and can see that there is indeed a close approach to Earth on that day. I have therefore added it to the table. Below is the ephemeris (delta column is the close approach distance, which is in AU):
******************************************************************************* Ephemeris / WWW_USER Tue Dec 24 09:04:20 2019 Pasadena, USA / Horizons ******************************************************************************* Target body name: (2008 DB) {source: JPL#16} Center body name: Earth (399) {source: DE431} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 2032-Aug-14 14:45:00.0000 UT Stop time : A.D. 2032-Aug-14 15:00:00.0000 UT Step-size : 1 minutes ******************************************************************************************************* Date__(UT)__HR:MN R.A._(ICRF/J2000.0)_DEC APmag delta deldot S-O-T /r S-T-O ******************************************************************************************************* $$SOE 2032-Aug-14 14:45 03 13 13.43 -53 10 35.3 12.96 0.00083386423011 -0.2131961 104.8814 /L 75.0733 2032-Aug-14 14:46 03 14 34.99 -53 11 12.8 12.96 0.00083378369805 -0.1883957 104.6792 /L 75.2755 2032-Aug-14 14:47 03 15 56.61 -53 11 46.9 12.97 0.00083371311393 -0.1635884 104.4770 /L 75.4777 2032-Aug-14 14:48 03 17 18.28 -53 12 17.4 12.98 0.00083365248035 -0.1387751 104.2747 /L 75.6799 2032-Aug-14 14:49 03 18 39.98 -53 12 44.5 12.98 0.00083360179949 -0.1139568 104.0724 /L 75.8821 2032-Aug-14 14:50 03 20 01.72 -53 13 08.1 12.99 0.00083356107323 -0.0891343 103.8701 /L 76.0844 2032-Aug-14 14:51 03 21 23.50 -53 13 28.2 13.00 0.00083353030303 -0.0643085 103.6678 /L 76.2867 2032-Aug-14 14:52 03 22 45.29 -53 13 44.8 13.00 0.00083350949003 -0.0394804 103.4654 /L 76.4890 2032-Aug-14 14:53 03 24 07.11 -53 13 57.9 13.01 0.00083349863499 -0.0146508 103.2631 /L 76.6914 2032-Aug-14 14:54 03 25 28.94 -53 14 07.5 13.02 0.00083349773829 0.0101792 103.0607 /L 76.8937 2032-Aug-14 14:55 03 26 50.77 -53 14 13.6 13.02 0.00083350679997 0.0350089 102.8583 /L 77.0960 2032-Aug-14 14:56 03 28 12.61 -53 14 16.2 13.03 0.00083352581969 0.0598374 102.6560 /L 77.2984 2032-Aug-14 14:57 03 29 34.44 -53 14 15.3 13.04 0.00083355479675 0.0846636 102.4536 /L 77.5007 2032-Aug-14 14:58 03 30 56.27 -53 14 10.9 13.05 0.00083359373010 0.1094867 102.2513 /L 77.7030 2032-Aug-14 14:59 03 32 18.08 -53 14 03.0 13.05 0.00083364261829 0.1343058 102.0489 /L 77.9053 2032-Aug-14 15:00 03 33 39.87 -53 13 51.6 13.06 0.00083370145956 0.1591200 101.8466 /L 78.1075 $$EOE *******************************************************************************************************
Rafflesgluft ( talk) 17:28, 24 December 2019 (UTC)
Should anyone add the 1994 PC1 asteroid ? It will pass over (5x Lunar Distance) from the earth in 18 January 2022. SLeFiNho ( talk) 09:49, 17 January 2022 (UTC)
Can someone please fix the distance from Earth? I only copy-pasted it from 2018 LA. Thank you! 72.203.63.234 ( talk) 04:25, 3 April 2022 (UTC)