Asteroids

398188 Agni help

Last update: 2025-09-10 00:30 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Aten

Perihelion (q)

0.628

Aphelion (Q)

1.101

Eccentricity (e)

0.273

Inclination (i)

13.3

deg

Orbit period (P)

293.6

Earth MOID

0.02187

U parameter

0.3

A₂

-30.1

10^-15au/days²

Next Earth close approach

Date

2026-06-30

Nominal distance (from Earth center)

0.19126

28611810

Maximum Brightness

18.2

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

19.4

mag

Diameter

400

Taxonomic type

Rotation period (T)

21.99

Discovery Information

Discovery Date

2010-06-03

Observatory

WISE

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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.864543

1-sigma variation

3.362E-9

Unit

Eccentricity (e)

Value

0.273334

1-sigma variation

2.528E-8

Unit

Inclination (i)

Value

13.2520

1-sigma variation

2.313E-6

Unit

Long. of Ascending Node (Ω)

Value

134.1750

1-sigma variation

3.128E-6

Unit

Arg. of Perihelion (ω)

Value

328.6307

1-sigma variation

1.011E-5

Unit

Mean Anomaly (M)

Value

252.90583

1-sigma variation

0.00002

Unit

Perihelion distance

Value

0.628234

1-sigma variation

Unit

Aphelion distance

Value

1.100852

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.337652

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.028204

1-sigma variation

Unit

MOID

Value

0.021867

1-sigma variation

Unit

Orbit Period

Value

293.6152

1-sigma variation

Unit

U parameter

Value

0.3

1-sigma variation

Unit

A₂

Value

-30.06311

1-sigma variation

8.56871

Unit

10^-15au/days²

Covariance Matrix

	a	e	i	Ω	ω	M	A₂
a	1.13062E-17	7.80404E-18	5.72287E-16	-2.24589E-16	1.10197E-15	-3.31399E-14	2.84394E-8
e	7.80404E-18	6.39286E-16	-4.89979E-14	5.51492E-15	-1.54491E-13	2.44415E-13	-1.65296E-9
i	5.72287E-16	-4.89979E-14	5.34860E-12	-2.36076E-12	1.76313E-11	-2.69656E-11	3.97636E-6
Ω	-2.24589E-16	5.51492E-15	-2.36076E-12	9.78347E-12	-2.63002E-11	2.68568E-11	-2.93806E-6
ω	1.10197E-15	-1.54491E-13	1.76313E-11	-2.63002E-11	1.02242E-10	-1.29266E-10	1.39419E-5
M	-3.31399E-14	2.44415E-13	-2.69656E-11	2.68568E-11	-1.29266E-10	2.72465E-10	-9.61685E-5
A₂	2.84394E-8	-1.65296E-9	3.97636E-6	-2.93806E-6	1.39419E-5	-9.61685E-5	7.34227E1

Date of computation: 2025-09-10 00:30 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

21.99

Unit

Source

[3]

Quality

Value

Unit

Source

[3]

Amplitude

Value

1.12

Unit

mag

Source

[3]

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

[1]

Taxonomy (all)

Value

Unit

Source

[2]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

19.379

Unit

mag

Source

[4]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[4]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.15

0.137

Unit

Source

[6]

[5]

Diameter

Value

400

Unit

Source

[5]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

Unit

mag

Source

[-]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Radar R

Unit

Source

[7]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Michaël Marsset et al 2022 AJ 163 165
[2]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[3]	EARN	1.) Warner, B.D. (2015) MPB 42, 41-53. (NEAR-EARTH ASTEROID LIGHTCURVE ANALYSIS AT CS3-PALMER DIVIDE STATION: 2014 JUNE-OCTOBER) (45 NEAs)
[4]	ESA Aegis	ESA orbit determination and impact monitoring system
[5]	EARN	1.) Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; et al. (2011) Astrophys. J. 741, A90. See also Grav 2012b and Masiero 2012.
[6]	EARN	1.) Mainzer, A. et al. (2011) ApJ 743, 156. (NEOWISE Observations of Near-Earth Objects: Preliminary Results) (albedo and diameters of 428 NEOs)
[7]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

7727

Unit

Source

[1]

Unobserved

Value

1116

Unit

Source

[1]

Normalized RMS of residuals

Value

0.43441

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2001-07-02.17509

Unit

Source

[2]

Last Observation

Value

2022-08-27.744723

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

691 (5)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2014-08-01

Unit

Source

[3]

Last Observation

Value

2018-07-23

Unit

Source

[3]

Delay (Discarded)

Value

7 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

6 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

13 (0)

Unit

Source

[1]

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
[3]	JPL Radar Observations	Jet Propulsion Laboratory: https://ssd.jpl.nasa.gov/dat/radar_data_ast.txt

Computation parameters

As seen from:

Initial Date: *

Final Date: *

Output option:

One line per time step

Time step:*

* - these fields are required

Close Approaches for 398188 Agni from 1950 to 2125

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possible distance in au	Distance uncert. in au
VENUS	1951-05-09 04:11	6.2	0.0417571	0.0417072	0.0000167
EARTH	1952-08-07 10:33	3.3	0.0453055	0.0452449	0.0000202
EARTH	1956-07-19 05:54	5.0	0.1447342	0.1446990	0.0000117
VENUS	1961-10-26 12:46	1.7	0.0356512	0.0356427	0.0000028
EARTH	1977-08-11 22:28	< 1 min	0.1606250	0.1606132	0.0000040
EARTH	1981-08-11 00:59	< 1 min	0.0248106	0.0248086	0.0000007
EARTH	1985-07-29 02:29	< 1 min	0.1064670	0.1064636	0.0000011
EARTH	1989-07-03 08:37	< 1 min	0.1853301	0.1853284	0.0000006
EARTH	2010-08-12 04:40	< 1 s	0.1557650	0.1557647	0.0000001
EARTH	2014-08-12 00:52	< 1 s	0.0399293	0.0399293	0.0000000
EARTH	2018-08-05 23:22	< 1 s	0.0600811	0.0600810	0.0000000
EARTH	2022-07-22 09:13	< 1 s	0.1340295	0.1340294	0.0000000
EARTH	2026-06-30 07:29	< 1 min	0.1912581	0.1912579	0.0000001
EARTH	2051-08-12 19:16	< 1 min	0.1299183	0.1299131	0.0000017
EARTH	2055-08-11 18:25	< 1 min	0.0294713	0.0294679	0.0000011
EARTH	2059-08-04 20:51	< 1 min	0.0695056	0.0695001	0.0000018
EARTH	2063-07-20 13:37	< 1 min	0.1405188	0.1405141	0.0000016
VENUS	2066-05-25 17:39	< 1 min	0.0377868	0.0377848	0.0000007
EARTH	2067-06-28 01:21	< 1 min	0.1947248	0.1947209	0.0000013
EARTH	2092-08-10 21:27	< 1 min	0.1944172	0.1943855	0.0000106
EARTH	2096-08-12 06:00	< 1 s	0.0982805	0.0982522	0.0000094
EARTH	2100-08-11 12:56	< 1 min	0.0252026	0.0251947	0.0000026
EARTH	2104-08-06 21:52	1.9	0.0554985	0.0554680	0.0000102
VENUS	2105-10-07 16:04	3.3	0.0441880	0.0441632	0.0000082
EARTH	2108-07-27 21:46	4.4	0.1123572	0.1123174	0.0000133
EARTH	2112-07-14 11:05	6.7	0.1585268	0.1584863	0.0000135
EARTH	2116-06-26 10:38	7.4	0.1968604	0.1968252	0.0000118

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
225.33780443	216.03051033	0.02301832	MINIMUM
342.41159186	338.68962776	0.37613152	SADDLE
356.54904420	176.81638638	1.64141456	SADDLE
182.32100030	3.02384048	2.08099818	MAXIMUM

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MOID Plots

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