Back of the Envelope Calculation Using the JPL's Fireball Data --- 2018 VP1

 I did a back of the envelope calculation using the JPL's fireball data to estimated that asteroids equal to or greater than 2018 VP1 impact the Earth at a rate of one every 37 to 53 days. IMHO we are at greater risk from the "background." https://docs.google.com/spreadsheets/d/12i7lhXgL0u6m36eoenKDKV-dLtkoedz0/edit?f#gid=1305411600 asteroid https://cneos.jpl.nasa.gov/fireballs/ https://cneos.jpl.nasa.gov/sentry/details.html#?des=2018%20VP1

I am working on getting a website The Asteroid News up and running

 I am working on getting a website the Asteroid News up and running. There is a need for very high quality researches, writers, editors, web editors, coders, databases, etc. info(AT)theasteroidnews(dot)com

2018 SV13... "the object is not real"

There has been some media hub ba over 2018 SV13 Update on 2020 July 17 at 14:31 UT the Minor Planet Center Issued "MPEC 2020-O10 : RETRACTION OF 2018 SV13" .. 2018 SV13 " … the object is not real..." see https://minorplanetcenter.net/mpec/K20/K20O10.html

 Image edited by Steven M. Tilley  see the original (public domain) image Planetoid crashing into primordial Earth  at  Donald Davis' official site

2018 VP1 Information Sheet-- "1 in 240" Odds of a Fireball on 2020-11-02 or ."99.59% chance the asteroid will MISS the Earth"

2018 VP1 Information Sheet-- "1 in 240"  Odds of a Fireball on 2020-11-02 or ."99.59% chance the asteroid will MISS the Earth"

This artist's concept shows a broken-up asteroid.
Image: Courtesy NASA/JPL-Caltech

Throughout the year, very small rocks strick the Earth's atmosphere and creating spectacular fireballs.  Most of these rocks travel through space unknown to habitats of Earth until they strick the atmosphere.   If we are lucky, the fireball will be seen and reported.  If we are really lucky, the fireballs will be capture on film.  The most vast majority of fireballs are of no danger what so ever. Most fireballs are like rainbows in that they are cool.  Four times in the past, these rocks travel through the field of vision of an asteroid observer before impact. Observation was taken. The rocks were given designations, like 2014 AA( i.e., the first discovery of the first half of January in 2014), and the rocks "became" asteroids.  These four asteroids were on the safe side when it comes to size.

In the first half of November 2018, an asteroid was discovered and give the designation 2018 VP1.  This asteroid is very small[1.8 m - 3.9 m ( 5.90551 to 12.79528 feet) ]. This asteroid was only observed 21 times over 13 days. 

In orbit determination, one calculation what orbit will place the object in the sky where it was seen. If one knows an object's orbit, it knows where it is going and where it will be in the sky.  All observations are "imperfect," so there will be many similar orbits.  If one were to create virtual asteroids for each of the similar orbits and did a simulation, one would see over time. The virtual asteroids move apart from each other to create an uncertainty region.  The real asteroid is somewhere within the uncertainty region. When doing the simulation, if any of the virtual asteroids impact the Earth, they become virtual impactors, and there is 'Non-Zero' probability of the real asteroid hitting the Earth.  By calculating the percentage of virtual impactors to virtual asteroids, one can calculate the risk of impact.

There is a very low-risk impact 2018 VP1 will on 2020-11-02. However, it must be restarted this asteroid is very small[1.8 m - 3.9 m ( 5.90551 to 12.79528 feet) ]. We have a fireball this size about two times a year.

Also see Sentry: Earth Impact Monitoring

Find_orb computing  Monte Carlo variant orbits  for the NEO 2018 VP1. One can use Monte Carlo method to  create virtual asteroids. By using orbits of  the virtual asteroids one can can see where the "real" asteroid could go. If any of virtual asteroids impact the Earth they become  known as  virtual impactors and the is 'Non-Zero' probability of  the real  asteroid hitting the Earth

An program is Solex & Exorb

@kpheider asked me to calculate a path of risk for #2018VP1. It's only a few meters across but JPL's SENTRY has it at 1 chance in 240 of impacting on Nov 2, 2020 (ESA/NEODys has it at 1 in 400). Path of risk stretches across the Pacific. Calculated with SOLEX 12.1 pic.twitter.com/U8SGb8CvOl

— Peter Thomas (@ptastro1) July 26, 2019

Background

(as of 2020-06-13 )

• Object: 2018 VP1
• Orbit Type: NEO Apollo
• Approximate Diameter: 1.8  m - 3.9 m  ( 5.90551  to  12.79528 feet) (Absolute Magnitude: H=30.9)
• On the Sentry Risk Table:  YES 
• Impact Probability(2020-11-02.05) = 4.1e-3
• 0.41% chance of Earth impact
• 1 in 240 odds of impact
• 99.59% chance the asteroid will miss the Earth
•  for more information read Understanding Risk Pages by Jon Giorgini
• On the NEODyS CLOMON2 risk page: YES
• (2020-11-02.051) 5.16e-3
• 0.516%
• 1 in 194
• 99.484% chance the asteroid will miss the Earth
• Possible Earth Impact Effects Program of 2018 VP1
• Listed on The Near-Earth Object Human Space Flight Accessible Targets Study (NHATS):NO
• Listed on the Goldstone Asteroid Radar Schedule:NO
• Listed on the Arecibo Asteroid Radar Schedule:NO
• Radar Observations:
• Discovery observation was made: 2018 11 03.27284202 5 (By  Palomar Mountain--ZTF (MPC Code I41)[ First precovery observation was 2018 11 03.27249502]
• Last Observation(publish) was made: 2018 11 16.24026503  (By Cerro Paranal (MPC Code 309))
• Data-Arc Span (publish): 13   days ( yr)
• Number of Optical Observations(published): 21
• Oppositions: 1
• Number of Observatories Reporting (Published) Observations :5
• Observatories Reporting (Published) Observations(MPC Code):
• (309) Cerro Paranal, Chile.
• (H01) Magdalena Ridge Observatory, Socorro, US/New
• (I41) Palomar Mountain--ZTF, US/California.
• (L01) Višnjan Observatory, Tičan, Croatia.
• (T12) Mauna Kea-UH/Tholen NEO Follow-Up (2.24-m) 
• Perihelion Distance: 0.9051326626577225   (AU)
• Aphelion Distance: 2.270308947523921 (AU)
• Earth MOID: 5.54556E-5  (AU), 0.022 (LD), 1.30069951121949  (Earth Radii), (Miles), or  8,296.04 5,154.92 (KM)
• Close-Approach to Earth: Will pass the Earth on 2020-Nov-02 11:33  at a Nominal Distance(Best Fit) of  0.00280167254552464  (AU),  1.09 (LD), 65.71 (Earth Radii),  260,431.733 (Miles), or 419,124.247(KM). "IF" the Earth was the Size of a Basketball flyby would be  25.53 feet (  7.78 meters) away
• Close-Approach to Earth Uncertainty: 
• Distance (Maximum Distance (au) - Minimum Distance (au)):  0.0256085074009903 - 3.90766585857012e-05  = 0.02556943074(AU)  9.951(LD) or  3,825,132.39 KM( 2,376,827.07 Miles)
• Time Uncertainty: (minutes) 4750.56847240545 ( 3 Days  7 Hours  11
  Minutes)
• Object velocity relative to Earth at close-approach [V-relative] (KM/S): 9.71114662839966
• Object velocity relative to a massless Earth at close-approach[V-infinity](KM/S):9.61271582257126
• Visibility: 
• Naked Eye Visibility:NO
• Peak Magnitude:  17.1
  
•  2018 VP1 Ephemerides(Near Earth Objects Dynamic Site - NEODyS - SpaceDyS)

Note: this was edited  to add links missing data formatting,  typos, replace, the image of Find_orb computing, fixing bad links .

163348 (2002 NN4) Information Sheet

The asteroid 163348 (2002 NN4) has been in the news recently. It passed "under" Earth's orbit on 2020-06-03 and Earth will pass over its orbit on 2020-06-05 and the close approach will be 2020-Jun-06 03:20 (UTC).

163348 (2002 NN4)
Earth Distance: 0.034 au
Sun Distance: 1.036 au
2020-06-06 03:20 UTC
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=163348;old=0;orb=1;cov=0;log=0;cad=1#orb

Background

(as of 2020-06-04)

• Object: 163348 (2002 NN4) 

• Orbit Type: Aten  [NEO,  PHA]
• Approximate Diameter: 250 m - 570 m (820.21 feet to 1870.08) (Absolute Magnitude: H= 20.1)[ Neowise estimates 2002NN4 to be 700 meters in diameter.]

• On the Sentry Risk Table: NO  In fact is has never been listed on Sentry  for more information read  Understanding Risk Pages by Jon Giorgini

•  On the NEODyS CLOMON2 risk page: NO

• Listed on The Near-Earth Object Human Space Flight Accessible Targets Study (NHATS): NO

• Listed on Goldstone Asteroid Radar Schedule:Yes

• First(Precovery) Observation was made: 2002 07 02.44600(By Palomar Mountain/NEAT, (MPC Code 644)

• Discovery observation was made:2002 07 09.32451 (By Lincoln Laboratory ETS, New Mexico. (MPC Code 704)

• Last Observation(publish): 2016 08 28.84488 (By Castelmartini) (MPC Code 160)

• Data-Arc Span (publish): 5171 days

• Number of Optical Observations(published): 364

• Number of  Observatories Reporting (Published) Observations : 47

• Observatories Reporting (Published) Observations(MPC Code):

• (046) Kleť Observatory, Ceske Budejovice, Czech

• (104) San Marcello Pistoiese, Italy. 

• (106) Črni Vrh, Slovenia.

• (113) Drebach, Germany.

• (130) Lumezzane,  Italy.

• (151) Eschenberg Observatory, Winterthur, Switzerland.

• (160) Castelmartini, Italy.

• (176) Observatori Astronomic de Consell, Spain.

• (198) Wildberg, Germany. 

• (203) GiaGa Observatory, Italy. 

• (204) Schiaparelli Observatory, Italy. 

• (240) Herrenberg Sternwarte, Germany. 

• (246) Klet Observatory-KLENOT, Czech Republic.

• (291) LPL/Spacewatch II, US/Arizona.

• (355) Hadano, Japan. 

• (422) Loomberah,  Australia/NSW.

• (448) Desert Moon, US/New Mexico.

• (473) Remanzacco,  Italy.

• (557) Ondřejov, Czech Republic. 

• (560) Madonna di Dossobuono, Italy. 

• (568) Mauna Kea, US/Hawaii.

• (587) Sormano, Italy. 

• (595) Farra d'Isonzo, Italy.

• (611) Starkenburg  (N49.647790 E8.653100)  Germany.

• (620) Observatorio Astronomico de Mallorca, Spain.

• (644) Palomar Mountain (NEAT),US/California. 

• (649) Powell Observatory, Louisburg, US/Kansas.

• (671) Stony Ridge  

• (673) Table Mountain Observatory, Wrightwood, US/California.

• (703) Catalina Sky Survey,  US/Arizona. 

• (704) Lincoln Observatory ETS, New Mexico,  US/New Mexico. 

• (715) Las Cruces,US/New Mexico. 

• (734) Farpoint Observatory, Eskridge, US/Kansas.

• (848) Tenagra Observatory, Cottage Grove, US/Oregon.

• (926) Tenagra II, US/Arizona.

• (966) Church Stretton, UK. 

• (A16) Tentlingen, Switzerland.

• (A17) Guidestar Observatory, Weinheim, Germany.

• (A24) New Millennium Observatory, Italy

• (B38) Santa Mama,  Italy.

• (C51) WISE.

• (D29) Purple Mountain Observatory, XuYi Station,  China. 

• (F51) Pan-STARRS 1, Haleakala,US/Hawaii.

• (H45) Arkansas Sky Obs., Petit Jean Mountain South. US/Arkansas.

• (H55) Astronomical Research Observatory,  Charleston, US/Illinois.

• (J95) Great Shefford, UK

• (Z52) The Studios Observatory, Grantham, UK.

• Perihelion Distance: 0.4955781402508977(AU)

• Aphelion Distance: 1.257210521695571(AU)

• Earth MOID: 0.00693791(AU),  2.7 (LD), 162.727229457(Earth Radii), 644,919.024 (Miles), or 1,037,896.563 (KM) 

• Close-Approach to Earth: Will safely pass Earth on 2020-Jun-06 03:20 at a Nominal Distance of 0.0340470945348114 (AU), 13.25(LD), 798.56748858316973383 (Earth Radii), 3,164,875.1578(Miles), or 5,093,372.846(KM). "IF" the Earth was the Size of a Basketball the (163348) 2002 NN4 flyby would be 309.92 feet (94.46 meters) away 

See:

• JPL Small-Body Database Browser  163348 (2002 NN4)

• MPC Database (163348) = 2002 NN4

• NEODyS-2(163348) 2002NN4

• Known-(with reasonably low uncertainty)-NEO-Earth-Close-Approaches-Less-Than-10LD(Nominal_Dist)

Edited for typo

What is in a Name ----Observer-Assigned Temporary, Provisional, Permanent Designations and Names

 

This composite image of the primordial contact binary Kuiper Belt Object 486958 Arrokoth =2014 MU69 – featured on the cover of the May 17 issue of the journal Science – was compiled from data obtained by NASA's New Horizons spacecraft as it flew by the object on Jan. 1, 2019. The image combines enhanced color data (close to what the human eye would see) with detailed high-resolution panchromatic pictures.
https://en.wikipedia.org/wiki/486958_Arrokoth#/media/File:UltimaThule_CA06_color_vertical.png

 Many times when there is a story about a small solar system body, one of the questions that come up is with its "name." Quite often, people will try to use designation and name as if they are interchangeable, which can lead to lead to confusion. Let us go into some background, from discovery to naming.  Observing is done by taking several images of the night sky and looking for moving objects. When observing small solar system bodies, observations are submitted to the Minor Planet Center(MPC), the worldwide data clearinghouse. All observations must be tag with the correct designation for the object.

When observers find something new, they use an "observer-assigned temporary designation." Temporary designations are also used when observers are not taking the time to identify objects, or there is doubt. Temporary designations must be unique to each "object" each "night." MPC's computer checks to see if observations with a temporary designation belong to known objects, other new discoveries, and make identifications. After two nights of observations, a "new" object is assigned a provisional designation. The provisional designation gives the year, the half-month, and the order of discovery(i.e., 2014 AA). If an object is "new" and maybe a NEO, it becomes a NEOCP object. NEOCP objects are posted to the NEO Confirmation Page using the "observer-assigned temporary designation" for rapid worldwide followup. NEOCPs may take longer than two nights to get a provisional designation.

The assignment of a provisional designation does not mean we know we know everything about an object. An object, because it is out of range, may go unobserved for many years. It is also possible the object was observed at an earlier opposition(apparitions). As more observations are taken, the orbit improves. With the improvements in orbit, it may become possible to make links and show one object is another already known object. So, therefore, an object may have more one provisional designations(principal and alternate designations).

After at least four oppositions(for main-belt), "two or three well-observed oppositions" for NEOs, and when uncertainty is low enough, an object is given a permanent designation(a number). At this time, discovery credit is assigned. After being numbered, objects become eligible to be named. It should be noted that debases will show the object's designations(permanent, provisional, alternate).

The discoverer, as defined by MPEC 2010-U20, may suggest a name within ten years after numbering. Names must follow some rules, and discoverer writes a brief naming citation explaining the name. Names and citations voted on by the fifteen-member The Working Group for Small Bodies Nomenclature  "Names become official when they are published in the Minor Planet Circulars. Note that the CSBN condemns the preannouncement of names, even if any such preannouncement indicates that a name is only a proposal." (see Guide to Minor Body Astrometry) 

After an object is named, it keeps its permanent(number) and provisional designations. Objects can be searched for by name, number, or provisional designations; however, observer-assigned temporary designations are not kept. The number is used when reporting astrometry to the MPC. When observations are published, they are listed by number or provisional designation(not by name).

Names are useful; Arrokoth is more comfortable to say than (486958) 2014 MU69. If an object is named, the name can tell a reader something about the class of the object given that there naming rules for each class.  Of  851,094 known small solar system bodies  541,155 have been numbered, and ~22,000 have been named. One can spend hours reading naming citations. Fact that an object is number tells you it is well observed with low uncertainty the sad thing is many times some reporters will not use the number in stories which leaves out useful information.

(486958) 2014 MU69  was set to be a New Horizons Flyby Target however it was not "named" yet so the public asked help come up with "Nickname" until "[a]fter the flyby, NASA and the New Horizons project plan to choose a formal name to submit to the International Astronomical Union, based in part on whether MU69 is found to be a single body, a binary pair, or perhaps a system of multiple objects. The chosen nickname will be used in the interim." -- Help Nickname New Horizons' Next Flyby Target (November 6, 2017) also see Introducing "Ultima Thule": NASA's Ultimate Destination in the Kuiper Belt! It was state plan was to work with International Astronomical Union on a permanent name after the flyby.

On 2019 November 8, Minor Planet Circulars 117229-118222 was published with a Official name and naming citation ---(486958) Arrokoth = 2014 MU69  also see  New Horizons Kuiper Belt Flyby Object Officially Named 'Arrokoth'  Then stories of name changes started to fly around the internet

I have done more updating to the table "Known-(with reasonably low uncertainty)-NEO-Earth-Close-Approaches-Less-Than-10LD(Nominal_Dist)-as-of-2019-11-08p"

I have done more updating to the table "Known-(with reasonably low uncertainty)-NEO-Earth-Close-Approaches-Less-Than-10LD(Nominal_Dist)-as-of-2019-11-08p"

I added

• Planetary Orbits -- Scale Model

• Solar System Objets -- Scale Model

Planetary Orbits [if the Earth was the size of a Basketball - with a radius of 12.0275 CM(4.73523622 inches)]

Solar System Objets
[if the Earth was the size of a Basketball - with a radius of 12.0275 CM(4.73523622 inches)]

If  the Earth was the size of a basketball  how far would the Moon [and the NEO Earth Close Approaches  be]?  Here is a spreadsheet of 9331 Close Approaches Less Than 10LD (Nominal_Dist) as of 2019 11-08p   [if the Earth was the size of a Basketball - with a
  radius of 12.0275 CM(4.73523622 inches)]

The Table "Known-(with reasonably low uncertainty)-NEO-Earth-Close-Approaches-Less-Than-10LD(Nominal_Dist)-as-of-2019-11-03a" Has been updated.

If  the Earth was the size of a basketball  how far would the Moon [and the NEO Earth Close Approaches  be]?  Here is a spreadsheet of 9281 Close Approaches Less Than 10LD (Nominal_Dist) as of 2019 11-03a   [if the Earth was the size of a Basketball - with a
  radius of 12.0275 CM(4.73523622 inches)]

NEO-Earth-Close-Approaches by number of Earth radii from 2010-January-01 to 2021-January-01

If  the Earth was the size of a basketball  how far would the Moon [and the NEO Earth Close Approaches  be]? in feet 2010-January-01 to 2021-January-01

Known NEO Earth Close Approaches <= Geosynchronous orbit
From 2004-Mar-01 to 2029-May-01
 (as of 2019-11-30)

• 10 Things You Should Know About Planetary Defense

Data from the NSA-JPL SBDB Close-Approach Data API https://ssd-api.jpl.nasa.gov/cad.api?dist-max=11LD&date-min=1900-01-01&date-max=2200-12-31&fullname=true&sort=dist

NEO Made a Close Flyby on Halloween Wow it was ~ 4.60 (Metaphorical) inches From a Basketball Size Earth

A 1  to 7 meters NEO made a close approache  on Halloween  it was ~ 4.60 (Metaphorical) Inches from a Basketball Size Earth. This asteroid discovered by the Catalina Sky Survey  and given the observer-assigned temporary designation. C0PPEV1(Now  2019 UN13) So far there is 18 observations from four observing stations over 3.7 hours. This object has gone out of range telescopes so new observations  runs will have wait until  2019 UN13 comes back in range(if ever).

If  the Earth was the size of a basketball  how far would the Moon [and the NEO Earth Close Approaches  be]? 

  Given the fact it was  the 2nd closest approache it is making buzz online ---by the way  it is too small to do anything.

In about 45 minutes from now (now = 10/31/19 7:00 am PDT), newly-discovered #asteroid C0PPEV1 will pass only 6200 km above Earth's surface. 45 minutes ago it was passing through Earth's shadow.
This is much closer than our geostationary satellites. https://t.co/q4qKuaUHjb pic.twitter.com/jsG2kaBY4O

— Tony Dunn (@tony873004) October 31, 2019

Newly-discovered #asteroid C0PPEV1 paid a heavy price for almost striking Earth this morning.
Earth's gravity bent its trajectory, sending its aphelion out to the asteroid belt.https://t.co/q4qKuaUHjb pic.twitter.com/vzx5zpxGBG

— Tony Dunn (@tony873004) October 31, 2019

From Bill Gray: C0PPEV1 = near-miss
this object is about to come _very_ close to us, perigee at 12520 +/- 70 km from the geocenter :https://t.co/5EoksMRcsg

People in Asia and Australia might be able to get
some astrometry on it over the next hour or two.

— Asteroid Initiatives (@AsteroidEnergy) October 31, 2019

A near-Earth asteroid, identified as C0PPEV1, was spotted early Thursday by the Catalina Sky Survey, based in Arizona. It extremely close, 6,200 km above Africa at 15:45 UTC.https://t.co/Vrqjx6T3QX

— Tom Ruen (@Tom_Ruen) October 31, 2019

Scout: NEOCP Hazard Assessment of C0PPEV1 archive
Pseudo-MPEC for C0PPEV1 - Project Pluto ..
Spooky Halloween asteroid flyby one of the closest near misses ever seen A big space boulder scopes out the trick-or-treating situation here on Earth.(Cnet)
Earth Impact Effects Program

A list of 9257 Known NEO Earth Close Approaches Less-Than 10LD (Nominal_Dist) as of 2019-10-30

Here is a list of 9,257 Known NEO Earth Close Approaches Less-Than 10LD (Nominal_Dist) as of 2019-10-30.

If  the Earth was the size of a basketball  how far would the Moon [and the NEO Earth Close Approaches  be]? 
Here is a  spreadsheet  [if the Earth was the size of a Basketball -
 Radius 12.0275 CM(4.73523622 inches)]

 Data from the SBDB Close-Approach Data API https://ssd-api.jpl.nasa.gov/cad.api?dist-max=25LD&date-min=1900-01-01&date-max=2200-12-31&fullname=true&sort=date

The 2019 UB8 2019-10-29 Flyby! How Close? Is Close?

(2019 UB8) approximate (0.50 LD) flyby distance from Earth
This image adapted by Steven M Tilley from the image the original
Earth-Moon.png by Nickshanks
 under licensed under the Creative Commons Attribution 2.5 Generic license

Tonight(2019-Oct-28/29) the NEO 2019 UB8 (4.4 m - 9.7 m) will do a flyby(A.K.A NEO Earth Close Approaches) of a Nominal Distance of 0.50 LD (0.00127 AU) ~191,000 KM (~ 119,000 miles). Sorting by nominal distance, this close approach is listed in the top 270 of 22,500+ entries in JPL's close approach database. (As of 2019-Oct-28) Flybys within one LD are quite common from what we "know" NEOs flybys within one LD a few times every week or so.

If  the Earth was the size of a basketball  how far would the Moon be?

What is Close

Close is a relative term. "Close" to a major sports venue is not the same as "close" to the ER. If one were to think of a basketball-size Earth, it may in understanding what is "close" and what is "far." In this, basketball-size Earth system, the ISS would be at ~0.76 CM (0.3 inches); we had NEO Flybys at 10.35 CM (4.1 inches) [ 2011 CQ1 on 2011-Feb-04] before. The Moon would range from ~673.41 CM (~22.0 Ft) to ~753.81 CM (~24.7 Ft). 2019 UB8 will be ~347.62 CM (~11.4 Ft) from the basketball. To see 2019 UB8 tonight, check out the Virtual Telescope Project.

NEO Earth Close Approaches within 25 Lunar distance(dist_min)

We getting better at finding NEO(s) however we have not been looking for very long. Many factors like the full moon, cloudy nights, the lack of large telescopes(i.e. poor sky coverage), etc can keep us from discovering them. So, therefore, we do not "know" about many of the Close Approaches that have happened.  Much of the "known" Close Approaches is only our best postdiction and predictions  Here is An  NEO Earth Close Approaches within 25 Lunar distance(dist_min) table [ Data was taken from NASA JPL SBDB Close-Approach Data API on 2019-10-14.] and scatter plots.  The apparent gaps are most likely were "unknown" Close Approaches would go.

"known" Close Approaches within 25 Lunar distance(nominal)

 

"known" Close Approaches within 10 Lunar distance(nominal)

"known" Close Approaches within 1 Lunar distance(nominal)

"known" Close Approaches within 0.5 Lunar distance(nominal)

"known" Close Approaches within 0.25 Lunar distance(nominal)

"known" Close Approaches within 0.1(Geosynchronous orbit) Lunar distance(nominal)

"known" Close Approaches within 25 Lunar distance(nominal) 1/1/2014  12:00:00 AM to 10/13/2019  11:59:00 PM

"known" Close Approaches within 10 Lunar distance(nominal) 1/1/2014  12:00:00 AM to 10/13/2019  11:59:00 PM

"known" Close Approaches within 1Lunar distance(nominal) 1/1/2014  12:00:00 AM to 10/13/2019  11:59:00 PM

"known" Close Approaches within 0.5 Lunar distance(nominal) 1/1/2014  12:00:00 AM to 10/13/2019  11:59:00 PM

"known" Close Approaches within 0.25 Lunar distance(nominal) 1/1/2014  12:00:00 AM to 10/13/2019  11:59:00 PM

"known" CA within 0.1(Geosynchronous orbit)  Lunar distance(nominal) 1/1/2014  12:00:00 AM to 10/13/2019  11:59:00 PM

"known" Close Approaches dist nominal 0.1(Geosynchronous orbit) LD vs Approximate Diameters (M) A=0.15

"known" Close Approaches dist nominal 0.25 LD vs Approximate Diameters (M) A=0.15

"known" Close Approaches dist nominal 0.5 LD vs Approximate Diameters (M) A=0.15

"known" Close Approaches dist nominal 1 LD vs Approximate Diameters (M) A=0.15

"known" Close Approaches dist nominal 10 LD vs Approximate Diameters (M) A=0.15

"known" Close Approaches dist nominal 25 LD vs Approximate Diameters (M) A=0.15

"known" Close Approaches by absolute magnitude (H)

To get an idea what sizes of "known" Asteroids here is a graph and table created JPL Small-Body Database Search Engine (Asteroids [Numbered and Unnumbered] on 2019-10-18)

upper Approximate Diameters (KM) A=0.15 vs Number of NEOs   upper Approximate Diameters (KM)  A=0.15 vs the number of all All Asteroids

		Approximate Diameters (KM)  A=0.15
upper(H)	lower(H)	upper	lower	All Asteroids		NEOs		NEOs has a % of All Asteroids
-1.50	-1.00	6,847.85	5,439.44	1	0.000%	0	0.000%	0.000%
-1.5	-1.00	6,847.85	5,439.44	1	0.000%	0	0.000%	0.000%
-1	-0.50	5,439.44	4,320.70	1	0.000%	0	0.000%	0.000%
-0.5	0.00	4,320.70	3,432.06	1	0.000%	0	0.000%	0.000%
0	0.50	3,432.06	2,726.18	1	0.000%	0	0.000%	0.000%
0.5	1.00	2,726.18	2,165.48	0	0.000%	0	0.000%	0.000%
1	1.50	2,165.48	1,720.10	0	0.000%	0	0.000%	0.000%
1.5	2.00	1,720.10	1,366.33	2	0.000%	0	0.000%	0.000%
2	2.50	1,366.33	1,085.31	2	0.000%	0	0.000%	0.000%
2.5	3.00	1,085.31	862.09	0	0.000%	0	0.000%	0.000%
3	3.50	862.09	684.79	7	0.001%	0	0.000%	0.000%
3.5	4.00	684.79	543.94	17	0.002%	0	0.000%	0.000%
4	4.50	543.94	432.07	28	0.003%	0	0.000%	0.000%
4.5	5.00	432.07	343.21	49	0.006%	0	0.000%	0.000%
5	5.50	343.21	272.62	98	0.012%	0	0.000%	0.000%
5.5	6.00	272.62	216.55	173	0.021%	0	0.000%	0.000%
6	6.50	216.55	172.01	285	0.034%	0	0.000%	0.000%
6.5	7.00	172.01	136.63	505	0.061%	0	0.000%	0.000%
7	7.50	136.63	108.53	581	0.070%	0	0.000%	0.000%
7.5	8.00	108.53	86.21	636	0.077%	0	0.000%	0.000%
8	8.50	86.21	68.48	557	0.067%	0	0.000%	0.000%
8.5	9.00	68.48	54.39	455	0.055%	0	0.000%	0.000%
9	9.50	54.39	43.21	359	0.043%	1	0.005%	0.000%
9.5	10.00	43.21	34.32	309	0.037%	0	0.000%	0.000%
10	10.50	34.32	27.26	342	0.041%	0	0.000%	0.000%
10.5	11.00	27.26	21.65	422	0.051%	0	0.000%	0.000%
11	11.50	21.65	17.20	607	0.073%	1	0.005%	0.000%
11.5	12.00	17.20	13.66	1,087	0.132%	0	0.000%	0.000%
12	12.50	13.66	10.85	1,880	0.228%	1	0.005%	0.000%
12.5	13.00	10.85	8.62	3,688	0.446%	2	0.009%	0.000%
13	13.50	8.62	6.85	6,765	0.819%	2	0.009%	0.000%
13.5	14.00	6.85	5.44	11,956	1.447%	7	0.033%	0.001%
14	14.50	5.44	4.32	20,126	2.436%	9	0.043%	0.001%
14.5	15.00	4.32	3.43	32,511	3.935%	31	0.147%	0.004%
15	15.50	3.43	2.73	51,611	6.247%	44	0.209%	0.005%
15.5	16.00	2.73	2.17	81,244	9.834%	76	0.361%	0.009%
16	16.50	2.17	1.72	114,481	13.856%	113	0.536%	0.014%
16.5	17.00	1.72	1.37	132,890	16.085%	166	0.788%	0.020%
17	17.50	1.37	1.09	124,987	15.128%	257	1.219%	0.031%
17.5	18.00	1.09	0.86	96,977	11.738%	353	1.675%	0.043%
18	18.50	0.86	0.68	63,784	7.720%	576	2.733%	0.070%
18.5	19.00	0.68	0.54	34,062	4.123%	705	3.345%	0.085%
19	19.50	0.54	0.43	15,035	1.820%	919	4.360%	0.111%
19.5	20.00	0.43	0.34	6,651	0.805%	994	4.716%	0.120%
20	20.50	0.34	0.27	3,270	0.396%	1,099	5.214%	0.133%
20.5	21.00	0.27	0.22	2,126	0.257%	1,174	5.570%	0.142%
21	21.50	0.22	0.17	1,601	0.194%	1,090	5.172%	0.132%
21.5	22.00	0.17	0.14	1,334	0.161%	1,045	4.958%	0.126%
22	22.50	0.14	0.11	1,189	0.144%	1,031	4.892%	0.125%
22.5	23.00	0.11	0.09	1,116	0.135%	1,037	4.920%	0.126%
23	23.50	0.09	0.07	1,155	0.140%	1,129	5.357%	0.137%
23.5	24.00	0.07	0.05	1,229	0.149%	1,221	5.793%	0.148%
24	24.50	0.05	0.04	1,294	0.157%	1,291	6.125%	0.156%
24.5	25.00	0.04	0.03	1,301	0.157%	1,301	6.173%	0.157%
25	25.50	0.03	0.03	1,202	0.145%	1,202	5.703%	0.145%
25.5	26.00	0.03	0.02	1,031	0.125%	1,031	4.892%	0.125%
26	26.50	0.02	0.02	932	0.113%	932	4.422%	0.113%
26.5	27.00	0.02	0.01	756	0.092%	756	3.587%	0.092%
27	27.50	0.01	0.01	530	0.064%	530	2.515%	0.064%
27.5	28.00	0.01	0.01	383	0.046%	383	1.817%	0.046%
28	28.50	0.01	0.01	229	0.028%	229	1.086%	0.028%
28.5	29.00	0.01	0.01	133	0.016%	133	0.631%	0.016%
29	29.50	0.01	0.00	101	0.012%	101	0.479%	0.012%
29.5	30.00	0.00	0.00	52	0.006%	52	0.247%	0.006%
30	30.50	0.00	0.00	27	0.003%	27	0.128%	0.003%
30.5	31.00	0.00	0.00	14	0.002%	14	0.066%	0.002%
31	31.50	0.00	0.00	5	0.001%	5	0.024%	0.001%
31.5	32.00	0.00	0.00	2	0.000%	2	0.009%	0.000%
32	32.50	0.00	0.00	4	0.000%	4	0.019%	0.000%
32.5	33.00	0.00	0.00	0	0.000%	0	0.000%	0.000%
33	33.50	0.00	0.00	1	0.000%	1	0.005%	0.000%
33.5	34.00	0.00	0.00	0	0.000%	0	0.000%	0.000%
34	34.50	0.00	0.00	0	0.000%	0	0.000%	0.000%
34.5	35.00	0.00	0.00	0	0.000%	0	0.000%	0.000%
35	35.50	0.00	0.00	0	0.000%	0	0.000%	0.000%
35.5	36.00	0.00	0.00	0	0.000%	0	0.000%	0.000%