List of unnumbered minor planets

This is a dynamic list and may never be able to satisfy particular standards for completeness. You can help by expanding it with reliably sourced entries.

This is a partial list of unnumbered minor planets. Currently approximately one third of known minor planets remain unnumbered.[1][2] In the list, only unnumbered asteroids discovered before 1990, and notable unnumbered asteroids are included. The primary reason asteroids remain unnumbered is because they are either lost or discovered recently, and as such have not been observed long enough to qualify for being numbered (about a decade). Several new asteroids are discovered every hour, so it would be pointless to attempt to make a list of every one of them.

1927

Designation Discovery date Orbit Semimajor axis (AU) eccentricity inclination (°) Absolute magnitude (H) observation arc (days) # of observations
1927 LA 1927/06/01 Outer main belt 3.3223 0.344 17.72 11.0 34 3

1935

Designation Discovery date Orbit Semimajor axis (AU) eccentricity inclination (°) Absolute magnitude (H) observation arc (days) # of observations
1935 UZ 1935/10/19 Mars-crosser 2.2 0.25 4.8 ? 4 3

1937

Designation Discovery date Orbit Semimajor axis (AU) eccentricity inclination (°) Absolute magnitude (H) observation arc (days) # of observations
1937 CK 1937/02/10 Main belt 2.320 0.139 6.55 ? 31 3

1939

Designation Discovery date Orbit Semimajor axis (AU) eccentricity inclination (°) Absolute magnitude (H) observation arc (days) # of observations
1939 RR 1939/09/15 Main belt 2.90 0.25 13.1 12.0 27 3

1942

Designation Discovery date Orbit Semimajor axis (AU) eccentricity inclination (°) Absolute magnitude (H) observation arc (days) # of observations
1942 RH 1942/09/05 Main belt 2.26 0.145 4.2 13.8 10 4

1960

Designation Discovery date Orbit Semimajor axis (AU) eccentricity inclination (°) Absolute magnitude (H) observation arc (days) # of observations
1960 SM = 2016 EB169 1960/09/24 Main belt 2.7 0.1 11 16.496 4 6
1960 SO 1960/09/24 Main belt 3.1 0.1 10 15.892 4 7
1960 SB1 1960/09/24 Mars-crosser 3.0 0.53 10.4 17.222 4 6
1960 SC1 1960/09/24 Main belt 2.543 0.215 8.92 16.67 32 10

1973

Designation Discovery date Orbit Semimajor axis (AU) eccentricity inclination (°) Absolute magnitude (H) observation arc (days) # of observations
1973 SV1 1973/09/19 Mars-crosser 2.56 0.451 3.33 17.936 16 15

1979

Designation Discovery date Orbit Semimajor axis (AU) eccentricity inclination (°) Absolute magnitude (H) observation arc (days) # of observations
1979 MW5 1979/06/25 Main belt 3.1 0.27 10 16.0 5 3
1979 XB 1979/12/11 Apollo 2.2 0.70 25 18.6 4 18

1981

Designation Discovery date Orbit Semimajor axis (AU) eccentricity inclination (°) Absolute magnitude (H) observation arc (days) # of observations
1981 EG6 1981/03/07 Main belt 2.904 0.298 6.549 17.265 38 5
1981 EX11 1981/03/07 Outer main belt 3.260644 0.30993 18.6934 16.6 10,654 24
1981 ES34 1981/03/02 Main belt 2.56 0.27 7.4 17.08 10 7
1981 EN35
= 2014 FN21 		1981/03/02
2014/03/23 		Main belt 2.38030883 0.2111753 11.56826 17.3 12,132 69
1981 EO47 1981/03/02 Main belt 2.5848 0.2469 4.472 15.0 77 7

1982

Designation Discovery date Orbit Semimajor axis (AU) eccentricity inclination (°) Absolute magnitude (H) observation arc (days) # of observations
1982 YA
= 2003 WE42 		1982/12/21 Amor 3.648666 0.6919468 35.13793 18.0 7,767 64

1983

Designation Discovery date Orbit Semimajor axis (AU) eccentricity inclination (°) Absolute magnitude (H) observation arc (days) # of observations
1983 LC 1983/06/13 Apollo 2.61432378 0.71024326 1.532394 19.3 7,852 71
1983 QC 1983/08/30 Mars-crosser 2.5935799 0.4329975 7.24473 18.2 9,156 34

1984

Designation Discovery date Orbit Semimajor axis (AU) eccentricity inclination (°) Absolute magnitude (H) observation arc (days) # of observations
1984 QL1
= 2002 XP102
= 2013 JS30 		1984/08/29
2002/12/05
2013/05/11 		Outer main belt 3.28244603 0.50418041 4.82773 15.5 11,046 64

1986

Designation Discovery date Orbit Semimajor axis (AU) eccentricity inclination (°) Absolute magnitude (H) observation arc (days) # of observations
1986 JE 1986/05/09 Inner main belt 1.831 0.0288 20.64 18.608 33 27
1986 NA
= 2013 UU3 		1986/07/08
2013/10/24 		Amor 1.93317464 0.402084 9.45646 19.8 10,029 30

1988

Designation Discovery date Orbit Semimajor axis (AU) eccentricity inclination (°) Absolute magnitude (H) observation arc (days) # of observations
1988 NE 1988/07/09 Amor 2.262 0.445 9.67 18.2 34 8
1988 PF1
= 2009 WD77 		1988/08/14
2009/11/18 		Mars-crosser 2.99424802 0.4540967 4.292648 16.6 9,647 162
1988 RH9 1988/09/01 Main belt 2.63 0.31 19.1 11.063 11 21

1989

1990

1991

1992

1993

B

D

F

G

H

K

M

O

P

R

T

U

V

W

1994

A

B

C

E

F

G

J

L

N

P

R

S

T

U

V

W

X

Y

1995

B

C

D

F

G

H

K

L

M

N

O

P

Q

R

S

T

U

W

X

Y

1997

1998

1999

2000

2001

2002

2003

2004

2005

2006

2007

2008

2009

2010

2011

2012

A

B

C

D

E

F

G

H

J

K

L

M

N

P

T

U

V

W

X

Y

2013

A

B

C

E

F

G

H

J

L

M

N

P

Q

R

S

T

U

V

W

X

Y

2014

A

B

C

D

E

F

G

H

J

K

L

M

O

P

Q

R

S

T

U

V

W

X

Y

2015

A

B

C

D

E

F

G

H

Notes

^ in a couple of cases, observations of the asteroids didn't include magnitudes, so it's not known exactly how bright they are. As such, it is impossible to determine absolute magnitude with any level of accuracy.

References

  1. ↑ http://www.minorplanetcenter.net/iau/lists/ArchiveStatistics.html
  2. ↑ How Many Solar System Bodies - JPL SBDB
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