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

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

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

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%