A Test of Find_orb and Guide9 with 2014 AA observations

A Test of Find_orb and Guide9 with 2014 AA observations

A Foofaraw Over a NEO Designated 2018 VP1

Artist's concept of a near-Earth object. Image: Courtesy NASA/JPL-Caltech

Commentary 

Over the years, the tabloids as shown a propensity for raising a foofaraw over Near-Earth Objects. The Close-Approach of 2018 VP1 is only about four months away, and an internet search will reveal several clickbait stories. Many times it appears that tabloid writers pick a random asteroid and writes a "story" about it. At times one must have some background or do some research to see what the more accurate story is.

There is a low probability, 1 in 240, that the two-meter 2018 VP1 will strike the Earth's atmosphere and create spectacular fireballs on 2020-11-02. A test with the Imperial College London's Earth Impact Effects Program reports, "The average interval between impacts of this size somewhere on Earth is 0.2 years". In other words, it would be safe to assume objects the size of 2018 VP1 has impacted Earth's atmosphere since 2018-Nov-03, the date of discovery. The Earth Impact Effects Program also suggests that the fireball is unlikely to do any significant damage. NASA JPL list kinetic energy at impact from 2018 VP1[IF ANY] as ~ 0.00042 MegaTons of TNT. The Chelyabinsk event was 0.4 to 0.5 MegaTons of TNT.

Four times in the past, NEOs were observed by observers of asteroids before impact. These four asteroids(2008 TC3,2014 AA, 2018 LA, and 2019 MO) all were on the safe side when it comes to size.

Object	Date of discovery	Date of Impact	Size(M)
2008 TC3	2008-10-06	2008-10-07	4.1
2014 AA	2014-01-01	2014-01-02	2–4
2018 LA	2018-06-02	2018-06-02	2.6–3.8
2019 MO	2019-06-22	2019-06-22	3–10

One of the programs available to the amateur observers of asteroids and comets is Find_Orb.[By Bill Gray] It is useful for calculating approximate ephemeris, determining approximate orbits, generating virtual asteroids, virtual impactors, predicting impact locations, and many other things. It should be noted IF one uses the wrong setting, one gets an incorrect solution. Find_Orb can generate an "asteroid risk corridor" with the help of Guide 9.1.[By Bill Gray]

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 

My Find_orb Setting

Selecting perturbers	All
Epoch	2020-11-01.051
Monte Carlo noise	2
Physical model Include	SRP
Filler out	3 worst observations

As a test of concept, I obtained the observations of 2018 VP1 for the Minor Planet Center. I loaded the observations into Find_Orb and had it run the Monte Carlo method all night. Find_orb generated the following files MPCOrb.dat, state.txt, and  virtual.txt. These files had orbits for 129,659 virtual asteroids 200 were virtual impactors( about 0.15%). I place a copy of the virtual.txt file in the Guide directory along with a copy of impact.tdf.(Project Pluto) Then Guide could generate a map of an asteroid risk corridor.

An asteroid (fireball) risk corridor of potential impact for the NEO 2018 VP1, the orange dots is where 200 virtual impactors strike the Earth's atmosphere.

Note: Because there were more than 9 observations, I had to edited virtual.txt to do a workaround. I replace "18 of 21" with "U of O" see edited virtual.txt; this keeps the columns in the right place. I also edited impact.tdf(My) file where I can have more than one risk corridor.

Another program is Solex & Exorb

Peter Thomas @ptastro1 also  this path of risk for 2018 VP1 on Twitter

@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: none
• 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)

 

Also see

 

VI VA table 2018 VP Find_orb_SRP 18 of 21 Epock 2020-11-01_051.xslx 

Note this has been edit to fix links and know typos.

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 .

441987 (2010 NY65) Information Sheet (2020)

 441987 (2010 NY65) Information Sheet (2020)

441987 (2010 NY65)
Earth Distance: 0.025 au
Sun Distance: 1.013 au
2020-06-24 06:44 UTC
JPL Small-Body Database Browser
Orbit Diagram
for
441987 (2010 NY65)
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=441987

441987 (2010 NY65)
Earth Distance: 0.025 au
Sun Distance: 1.013 au
2020-06-24 06:44 UTC
JPL Small-Body Database Browser
Orbit Diagram
for
441987 (2010 NY65)
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=441987

441987 (2010 NY65)
Earth Distance: 0.025 au
Sun Distance: 1.013 au
2020-06-24 06:44 UTC
JPL Small-Body Database Browser
Orbit Diagram
for
441987 (2010 NY65)
https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=441987

Background

(as of 2020-06-09 )

• Object: 441987 (2010 NY65)
• Orbit Type: Apollo [NEO, PHA]
• Approximate Diameter: 140 m - m 310 (459.318 to 1017.06 feet) (Absolute Magnitude: H= 21.4)
• Rotation Period: 4.9706 hour
• On the Sentry Risk Table: NO Removed from Sentry 2010-08-05 09:54:55 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 the Goldstone Asteroid Radar Schedule:YES
• Listed on the Arecibo Asteroid Radar Schedule:YES
• Radar Observations:
• First observation 2014-06-26
• Last observation 2016-06-26
• Delay : 9 [Discarded: 1]
• Doppler: 3[Discarded 0]
• Total: 12[Total Discarded:1]
• Discovery observation was made: 2010 07 14.14345 (By WISE (MPC Code C51)
• Last Observation(publish) was made: 019 07 21.318819 (By Palomar Mountain--ZTF (MPC Code I41 ))
• Data-Arc Span (publish): 3294 days (9.02 yr)
• Number of Optical Observations(published): 695
• Oppositions: 8
• Number of Observatories Reporting (Published) Observations : 42
• Observatories Reporting (Published) Observations(MPC Code):
• (089) Nikolaev, Ukraine.
• (104) San Marcello Pistoiese,Italy.
• (130) Lumezzane, Italy.
• (160) Castelmartini, Italy.
• (203) GiaGa Observatory, Italy.
• (204) Schiaparelli Observatory, Italy.
• (291) LPL/Spacewatch II, US/Arizona.
• (511) Haute Provence, France.
• (568) Mauna Kea, US/Hawaii.
• (654) Table Mountain Observatory, Wrightwood-PHMC, US/California.
• (691) Steward Observatory, Kitt Peak - Spacewatch US/Arizona.
• (703) Catalina Sky Survey, US/Arizona.
• (B18) Terskol, Russia.
• (B38) Santa Mama, Italy.
• (C23) Olmen, Belgium.
• (C51) WISE
• (C77) Bernezzo Observatory, Italy.
• (D29) Purple Mountain Observatory, XuYi Station, China.
• (F51) Pan-STARRS 1, Haleakala, US/Hawaii.
• (G34) Oberfrauendorf, Germany.
• (G45) Space Surveillance Telescope, Atom Site, US/New Mexico.
• (G96) Mt. Lemmon Survey, US/Arizona.
• (H06) iTelescope observatories, Mayhill, US/New
• (H21) Astronomical Research Observatory, Westfield US/Illinois
• (H45) Arkansas Sky Obs., Petit Jean Mountain South, US/Arkansas.
• (I15) Wishing Star Observatory, Barrington, US/Rhode Island.
• (I41) Palomar Mountain--ZTF,US/California.
• (J43) Oukaïmeden Observatory, Marrakech, Morocco.
• (J69) North Observatory, Clanfield,UK.
• (K38) M57 Observatory, Saltrio, Italy.
• (K83) Beppe Forti Astronomical Observatory, Montelupo, Italy.
• (K91) Sutherland-LCO A, South Africa
• (L04) ROASTERR-1 Observatory, Cluj-Napoca, Romania.
• (T05) ATLAS-HKO, Haleakala, US/Hawaii. Observers
• (T08) ATLAS-MLO, Mauna Loa,US/Hawaii.
• (V04) FRoST, Anderson Mesa, US/Arizona.
• (W34) Squirrel Valley Observatory, Columbus, US/North Carolina.
• (W71) Rand II Observatory, Lake Placid, US/New York.
• (Y00) SONEAR Observatory, Oliveira ,Brazil.
• (Z21) Tenerife-LCO Aqawan A {#}1 Canary Islands (Spain).
• (Z35) OAO University Observatory Station Aras,Spain.
• (Z80) Northolt Branch Observatory, UK.
• Perihelion Distance: 0.6304923524460032 (AU)
• Aphelion Distance: 1.371788294334597 (AU)
• Earth MOID: 0.017471 (AU), 6.7991956311354 (LD),   409.77865464 (Earth Radii), 1,624,030.9 (Miles), or 2,613,624.4(KM)
• Close-Approach to Earth: Will safely pass Earth on 2020-Jun-24 at a Nominal Distance of  0.0251191828007878 (AU), 9.7756418039498  (LD), 589.165 (Earth Radii), 2,334,973.91 (Miles), or 3,757,776.3 (KM). "IF" the Earth was the Size of a Basketball flyby would be 228.7 feet ( 166.8 meters) away
• Close-Approach to Earth Uncertainty: 
• Distance (Maximum Distance (au) - Minimum Distance (au)): 0.025119195566403- 0.0251191700351812 = 2.55312E-08 or 3.8 KM(2.37 Miles)
• Time Uncertainty (minutes):0.000771792121408675
• Object velocity relative to Earth at close-approach [V-relative] (KM/S): 12.89
• Object velocity relative to a massless Earth at close-approach[V-infinity](KM/S): 12.88
• Visibility: 
• Naked Eye Visibility:NO
• Peak Magnitude: 16.7 on 27 June 2020 
• (441987) 2010NY65  Ephemerides(Near Earth Objects Dynamic Site - NEODyS - SpaceDyS)
• What is Need to Observe:  a large amateur telescope and CCD.

See:

• The Asteroid Lightcurve Database
• Asteroid Radar Research
• Minor Planet Radar Database
• Near-Earth Asteroid Lightcurve Analysis at the Center for Solar System Studies: 2019 July-September
• NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results

Note this was edited for formatting and adding infomation. 

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