Asteroids

8201 1994AH2 help

Last update: 2026-07-30 09:40 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.746

Aphelion (Q)

4.334

Eccentricity (e)

0.706

Inclination (i)

9.5

deg

Orbit period (P)

1478.8

Earth MOID

0.10066

U parameter

0.0

Next Earth close approach

Date

2091-01-15

Nominal distance (from Earth center)

0.17769

26581313

Maximum Brightness

15.1

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

15.9

mag

Diameter

1859

Taxonomic type

Rotation period (T)

23.95

Discovery Information

Discovery Date

1994-01-05

Observatory

Siding Spring Observatory

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

2.540218

1-sigma variation

4.740E-9

Unit

Eccentricity (e)

Value

0.706137

1-sigma variation

2.543E-8

Unit

Inclination (i)

Value

9.5401

1-sigma variation

3.483E-6

Unit

Long. of Ascending Node (Ω)

Value

164.0739

1-sigma variation

2.898E-5

Unit

Arg. of Perihelion (ω)

Value

25.1052

1-sigma variation

2.942E-5

Unit

Mean Anomaly (M)

Value

345.74070

1-sigma variation

0.00001

Unit

Perihelion distance

Value

0.746477

1-sigma variation

Unit

Aphelion distance

Value

4.333960

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.214721

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

2.524160

1-sigma variation

Unit

MOID

Value

0.100656

1-sigma variation

Unit

Orbit Period

Value

1478.7850

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.24687E-17	-4.90469E-17	3.80023E-16	8.82194E-15	8.32065E-15	-4.30788E-14
e	-4.90469E-17	6.46517E-16	-2.42969E-14	-1.53461E-13	1.48386E-13	7.90447E-14
i	3.80023E-16	-2.42969E-14	1.21280E-11	4.40556E-11	-4.55530E-11	-6.74012E-13
Ω	8.82194E-15	-1.53461E-13	4.40556E-11	8.40088E-10	-8.43209E-10	-1.75255E-12
ω	8.32065E-15	1.48386E-13	-4.55530E-11	-8.43209E-10	8.65814E-10	-3.02084E-11
M	-4.30788E-14	7.90447E-14	-6.74012E-13	-1.75255E-12	-3.02084E-11	8.86400E-11

Date of computation: 2026-07-30 09:40 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

23.95

Unit

Source

[6]

Quality

Value

Unit

Source

[6]

Amplitude

Value

>=0.27

Unit

mag

Source

[6]

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]

[2]

[3]

Taxonomy (all)

Value

O;V

Unit

Source

[4]

[5]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

15.856

Unit

mag

Source

[7]

Slope Parameter (G)

Value

0.15**

Unit

Source

[7]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.154

Unit

Source

[8]

Diameter

Value

1859

Unit

Source

[8]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

Unit

mag

Source

[-]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Visual S

Radar R

Unit

Source

[9]

[10]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Binzel, R.P. et al. (2004) Icarus 170, 259-294. (Observed spectral properties of near-Earth objects: results for population distribution, source regions, and space weathering processes.)
[2]	EARN	1.) Alexey V. Sergeyev and Benoit Carry A&A, 652 (2021) A59
[3]	EARN	1.) N. G. Simion et al, Spectral properties of near-Earth objects with low-Jovian Tisserand invariant (2021)
[4]	EARN	1.) Binzel, R.P. et al. (2004) Icarus 170, 259-294. (Observed spectral properties of near-Earth objects: results for population distribution, source regions, and space weathering processes.) 2.) Whiteley, R.J. (2001) PhD. Thesis, University of Hawaii. (A Compositional and Dynamical Survey of the Near-Earth Asteroids)
[5]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[6]	EARN	1.) Pravec, P. et al. (1996) Icarus 124, 471-482. (Lightcurves of 7 Near-Earth Asteroids)(1627,4957,6569,1993UC,1994AH2, 1994CB,1994LX) 2.) Petr Pravec's Ondrejov NEO Photometric Program Webpage "Prepublished Periods"
[7]	ESA Aegis	ESA orbit determination and impact monitoring system
[8]	EARN	1.) Mainzer, A. et al. (2011) ApJ 743, 156. (NEOWISE Observations of Near-Earth Objects: Preliminary Results) (albedo and diameters of 428 NEOs) 2.) Binzel, R.P. et al. (2002) in "Asteroids III" (Eds. W.F.Bottke et al.), Univ.Ariz.Press, Tucson, USA, pp. 255-271. (Physical Properties of NEOs) 3.) Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; et al. (2011) Astrophys. J. 741, A90. See also Grav 2012b and Masiero 2012.
[9]	EARN	1.) Binzel, R.P. et al. (2001) Icarus 151,139-149. (Spectral Properties of Near-Earth Objects: Palomar and IRTF Results for 48 Objects Including Spacecraft Targets (9969) Braille and (10302) 1989 ML) 2.) Fevig. R.A. and U. Fink (2007) Icarus 188, 175-188. (Spectral observations of 19 weathered and 23 fresh NEAs and their correlations with orbital parameters)(433,1036, 1627,1685,1862,1866,1943,1980,3103,3122,3199,3671,4183,4341, 4954,5587,5751,5836,6037,7358,7482,7753,7822,7977,8201, 10563,11066,13651,13651,19356,20236,20255,35107,85490, J97GD32,J97UH9,J97US9,J98HE3,J98HT31,J98ME3,J98MS2,K04LC2)
[10]	EARN	1.) Daubar, I.J. et al. (1998) B.A.A.S. 30, 1390. (First Results from the Arecibo Observatory Planetary Radar) 4183 Cuno, 1994 AH2, 1998 ML14 2.) Nolan, M.C. et al. (1998) B.A.A.S 30, 1036. (First Results from the Arecibo Observatory Planetary Radar)4183 Cuno, 1994 AH2,

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

16137

Unit

Source

[1]

Unobserved

Value

196

Unit

Source

[1]

Normalized RMS of residuals

Value

0.620207

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1981-12-16.45374

Unit

Source

[2]

Last Observation

Value

2026-02-20.554027

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

1015 (7)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

1998-06-30

Unit

Source

[3]

Last Observation

Value

1998-06-30

Unit

Source

[3]

Delay (Discarded)

Value

0 (0)

Unit

Source

[-]

Doppler (Discarded)

Value

1 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

1 (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

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 8201 1994AH2 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	1974-06-14 19:35	< 1 min	0.1713043	0.1713040	0.0000001
EARTH	1978-06-06 03:53	< 1 min	0.1802027	0.1802023	0.0000001
EARTH	1982-06-02 00:06	< 1 min	0.1945450	0.1945445	0.0000002
EARTH	1990-05-31 20:32	< 1 min	0.1889011	0.1889009	0.0000001
EARTH	1994-06-11 02:07	< 1 s	0.1693318	0.1693316	0.0000001
EARTH	1998-06-17 13:21	< 1 s	0.1930272	0.1930270	0.0000001
EARTH	2091-01-15 05:49	< 1 min	0.1776851	0.1776845	0.0000002
EARTH	2095-01-13 10:02	< 1 min	0.1838573	0.1838564	0.0000003

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
332.25739856	23.25276473	0.10065612	MINIMUM
31.02026416	151.89281905	0.16797914	MINIMUM
4.38206054	93.65679584	0.26327161	SADDLE
1.65838867	267.14898245	1.74651877	SADDLE
180.40087378	264.85389467	3.33560849	SADDLE
180.10352005	84.73085140	5.33042093	MAXIMUM

Download:

MOID Plots

Click on the images to zoom-in and zoom-out