Asteroids

2015JJ help

Last update: 2026-06-16 12:46 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.891

Aphelion (Q)

1.226

Eccentricity (e)

0.158

Inclination (i)

18.8

deg

Orbit period (P)

397.8

Earth MOID

0.00210

U parameter

0.8

A₂

-97.3

10^-15au/days²

Next Earth close approach

Date

2027-05-02

Nominal distance (from Earth center)

0.14002

20946481

Maximum Brightness

19.8

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

100 - 230*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2015-05-08

Observatory

University of Arizona Catalina Sky Survey

ORBIT VISUALISATION TOOLS

External links

Proper elements

Epoch

Near present day

Near middle of observation arc

Orbit properties

Epoch
Semimajor Axis
Eccentricity (e)
Inclination (i)
Long. of Ascending Node (Ω)
Arg. of Perihelion (ω)
Mean Anomaly (M)
Perihelion distance
Aphelion distance
Asc. Node-Earth Sep.
Desc. Node-Earth Sep.
MOID
Orbit Period
U parameter

Value

1-sigma variation

Unit

Epoch

Value

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.058581

1-sigma variation

1.354E-8

Unit

Eccentricity (e)

Value

0.158310

1-sigma variation

3.060E-7

Unit

Inclination (i)

Value

18.8044

1-sigma variation

1.613E-5

Unit

Long. of Ascending Node (Ω)

Value

223.1890

1-sigma variation

1.023E-5

Unit

Arg. of Perihelion (ω)

Value

254.3167

1-sigma variation

2.962E-5

Unit

Mean Anomaly (M)

Value

156.14102

1-sigma variation

0.00005

Unit

Perihelion distance

Value

0.890997

1-sigma variation

Unit

Aphelion distance

Value

1.226165

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.070234

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.002262

1-sigma variation

Unit

MOID

Value

0.002097

1-sigma variation

Unit

Orbit Period

Value

397.8180

1-sigma variation

Unit

U parameter

Value

0.8

1-sigma variation

Unit

A₂

Value

-97.27737

1-sigma variation

21.93720

Unit

10^-15au/days²

Covariance Matrix

	a	e	i	Ω	ω	M	A₂
a	1.83254E-16	-3.47213E-15	-1.77584E-13	-7.29306E-14	-1.01557E-13	-4.19604E-14	2.71774E-7
e	-3.47213E-15	9.36589E-14	4.34488E-12	2.23607E-12	4.59893E-12	-5.75424E-12	-4.67747E-6
i	-1.77584E-13	4.34488E-12	2.60174E-10	1.05783E-10	9.16544E-11	-6.86455E-11	-2.34737E-4
Ω	-7.29306E-14	2.23607E-12	1.05783E-10	1.04670E-10	2.03463E-10	-3.41357E-10	-1.06450E-4
ω	-1.01557E-13	4.59893E-12	9.16544E-11	2.03463E-10	8.77596E-10	-1.41133E-9	-1.82832E-4
M	-4.19604E-14	-5.75424E-12	-6.86455E-11	-3.41357E-10	-1.41133E-9	2.84511E-9	1.57937E-5
A₂	2.71774E-7	-4.67747E-6	-2.34737E-4	-1.06450E-4	-1.82832E-4	1.57937E-5	4.81239E2

Date of computation: 2026-06-16 12:46 UTC

Note: The ASCII file is in a format suitable for Orbfit input.

Download ASCII file:

Physical properties

Rotation Period
Quality
Amplitude
Rotation Direction
Spinvector L
Spinvector B

Rotational properties

Value

Unit

Source

Rotation Period

Value

Unit

Source

[-]

Quality

Value

Unit

Source

[-]

Amplitude

Value

Unit

mag

Source

[-]

Rotation Direction

Value

Unit

Source

[-]

Spinvector L

Value

Unit

Source

[-]

Spinvector B

Value

Unit

Source

[-]

Taxonomy
Taxonomy (all)

Taxonomy

Value

Unit

Source

Taxonomy

Value

Unit

Source

[-]

Taxonomy (all)

Value

Unit

Source

[-]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

22.031

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[2]

Diameter

Value

100 - 230*

Unit

Source

[2]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

Unit

mag

Source

[-]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Unit

Source

[-]

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Sources

No.	Name	Additional
[1]	ESA Aegis	ESA orbit determination and impact monitoring system
[2]	Estimation	Estimated from absolute magnitude

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

8445

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.343613

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2003-05-03.2735

Unit

Source

[2]

Last Observation

Value

2026-06-16.36199

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

290 (0)

Unit

Source

[1]

Radar Summary

First Observation
Last Observation
Delay (Discarded)
Doppler (Discarded)
Total Optical Observations (Discarded)

Radar

Value

Unit

Source

First Observation

Value

Unit

Source

[-]

Last Observation

Value

Unit

Source

[-]

Delay (Discarded)

Value

0 (0)

Unit

Source

[-]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[-]

Total Radar Observations (Discarded)

Value

0 (0)

Unit

Source

[-]

Note: The ASCII file is in a format suitable for Orbfit input.

Sources

No.	Name	Additional
[1]	ESA Aegis	ESA orbit determination and impact monitoring system
[2]	MPC	Minor Planet Center: https://www.minorplanetcenter.net

Filters

Initial Date: *

Final Date: *

Normalised Only accepted

Max residual (arcsec):

* - these fields are required

Plot

Computation parameters

As seen from:

Initial Date: *

Final Date: *

Output option:

One line per time step

Time step:*

* - these fields are required

Note: Ephemerides requests are limited to a maximum of 1000 points and a final date not exceeding 2040/12/31 00:00.

Close Approaches for 2015JJ from 1950 to 2126

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possible distance in au	Distance uncert. in au
EARTH	1955-04-29 08:04	< 1 min	0.0683593	0.0683560	0.0000011
EARTH	1965-10-28 17:54	< 1 min	0.1708744	0.1708339	0.0000135
EARTH	1967-04-29 01:57	< 1 min	0.0945978	0.0945710	0.0000089
EARTH	1977-11-01 20:02	< 1 min	0.0822758	0.0822436	0.0000107
EARTH	1979-04-29 21:43	< 1 min	0.1630714	0.1630465	0.0000083
EARTH	1989-11-04 12:09	< 1 min	0.0234335	0.0234276	0.0000020
EARTH	1991-05-01 01:08	< 1 min	0.1976554	0.1976492	0.0000020
EARTH	2001-10-30 16:22	< 1 min	0.1328692	0.1328651	0.0000014
EARTH	2003-04-29 15:54	< 1 min	0.1029944	0.1029928	0.0000005
EARTH	2015-04-29 21:11	< 1 min	0.0659825	0.0659822	0.0000001
EARTH	2027-05-02 21:09	< 1 min	0.1400186	0.1400162	0.0000008
EARTH	2038-11-09 07:07	< 1 min	0.0807691	0.0807633	0.0000019
EARTH	2050-11-05 19:04	< 1 min	0.0027735	0.0027649	0.0000028
EARTH	2052-05-01 02:03	< 1 min	0.1131893	0.1131491	0.0000134
EARTH	2066-05-02 04:54	17.9	0.1262664	0.1250868	0.0003936
EARTH	2079-11-05 11:00	44.0	0.0177611	0.0155245	0.0007460
EARTH	2081-05-01 06:18	15.9	0.0768895	0.0758419	0.0003494
EARTH	2094-11-04 00:01	613.6	0.0492605	0.0174147	0.0106216
EARTH	2096-04-30 18:46	133.3	0.0518888	0.0443906	0.0047354
EARTH	2109-11-01 16:08	177.9	0.1261625	0.1168851	0.0030925
EARTH	2111-05-02 09:40	4.9	0.0609624	0.0565075	0.0015321
EARTH	2125-11-12 18:28	208.5	0.1677308	0.1493170	0.0061380
EARTH	2126-05-05 08:42	334.1	0.1852174	0.1681302	0.0057404

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
294.14545889	299.49592279	0.00209719	MINIMUM
91.95200277	113.55375174	0.06353990	MINIMUM
13.34636363	28.19899925	0.31984064	SADDLE
193.15916913	204.42428326	0.41737071	SADDLE
5.66215458	198.86578861	1.88286966	SADDLE
174.98937363	7.90808634	2.18339090	MAXIMUM

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MOID Plots

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