Asteroids

14827 Hypnos help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.957

Aphelion (Q)

4.744

Eccentricity (e)

0.664

Inclination (i)

2.0

deg

Orbit period (P)

1758.1

Earth MOID

0.01577

U parameter

0.0

Next Earth close approach

Date

Nominal distance (from Earth center)

Maximum Brightness

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

18.9

mag

Diameter

500

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

1986-05-05

Observatory

Palomar Mountain

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

2.850740

1-sigma variation

5.331E-9

Unit

Eccentricity (e)

Value

0.664273

1-sigma variation

1.309E-8

Unit

Inclination (i)

Value

1.9653

1-sigma variation

4.845E-6

Unit

Long. of Ascending Node (Ω)

Value

57.7269

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

238.6406

1-sigma variation

0.0001

Unit

Mean Anomaly (M)

Value

103.39722

1-sigma variation

1.012E-6

Unit

Perihelion distance

Value

0.957070

1-sigma variation

Unit

Aphelion distance

Value

4.744409

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

1.443070

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.171154

1-sigma variation

Unit

MOID

Value

0.015774

1-sigma variation

Unit

Orbit Period

Value

1758.0642

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.84164E-17	-2.64585E-18	-7.08446E-16	-2.88228E-15	1.27593E-14	-3.06389E-15
e	-2.64585E-18	1.71421E-16	1.27087E-15	5.06938E-15	-1.57481E-14	5.83047E-15
i	-7.08446E-16	1.27087E-15	2.34724E-11	-5.28530E-11	5.92495E-11	-1.15465E-12
Ω	-2.88228E-15	5.06938E-15	-5.28530E-11	3.62749E-9	-3.66643E-9	7.36316E-12
ω	1.27593E-14	-1.57481E-14	5.92495E-11	-3.66643E-9	3.71216E-9	-9.62815E-12
M	-3.06389E-15	5.83047E-15	-1.15465E-12	7.36316E-12	-9.62815E-12	1.02362E-12

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

Unit

Source

[-]

Quality

Value

Unit

Source

[1]

Amplitude

Value

0.05

Unit

mag

Source

[1]

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]

Taxonomy (all)

Value

Unit

Source

[3]

[4]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

18.857

Unit

mag

Source

[5]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[5]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.22

Unit

Source

[6]

Diameter

Value

500

Unit

Source

[6]

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]

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Sources

No.	Name	Additional
[1]	EARN	1.) Wisniewski, W.Z. (1987) Icarus 70, 566-572. (Photometry of six radar target asteroids)1986 DA, 3199, 3103, and 1983 RD. 1986 JK and 1986 RA
[2]	EARN	1.) Alexey V. Sergeyev and Benoit Carry A&A, 652 (2021) A59
[3]	EARN	1.) Wisniewski, W.Z. (1987) Icarus 70, 566-572. (Photometry of six radar target asteroids)1986 DA, 3199, 3103, and 1983 RD. 1986 JK and 1986 RA 2.) Ostro, S.J. et al. (1989) Icarus 78, 382-394. (Radar observations of asteroid 1986 JK)
[4]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[5]	ESA Aegis	ESA orbit determination and impact monitoring system
[6]	EARN	1.) Trilling, D.E.; Mommert, M.; Hora, J.; Chesley, S.; et al. (2016) Astron. J. 152, A172. 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)
[7]	EARN	1.) Ostro, S.J. et al. (1989) Icarus 78, 382-394. (Radar observations of asteroid 1986 JK) 2.) Ostro, S.J. et al. (1991) Astron. J. 102, 1490-1502. (Asteroid radar astrometry)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

14112

Unit

Source

[1]

Unobserved

Value

285

Unit

Source

[1]

Normalized RMS of residuals

Value

0.49647

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1986-05-04.29705

Unit

Source

[2]

Last Observation

Value

2024-12-22.218381

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

388 (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

1986-05-28

Unit

Source

[3]

Last Observation

Value

1986-05-30

Unit

Source

[3]

Delay (Discarded)

Value

0 (0)

Unit

Source

[-]

Doppler (Discarded)

Value

10 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

10 (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 14827 Hypnos 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
EARTH	1958-05-31 02:07	< 1 min	0.0269833	0.0269802	0.0000010
MARS	1958-09-19 23:18	< 1 min	0.0198796	0.0198775	0.0000007
EARTH	1986-05-29 01:30	< 1 s	0.0283462	0.0283460	0.0000001
EARTH	2000-07-12 03:56	< 1 min	0.1221177	0.1221175	0.0000000
EARTH	2024-06-02 20:58	< 1 s	0.0784441	0.0784439	0.0000001
MARS	2048-12-13 19:08	< 1 min	0.0378029	0.0378012	0.0000006

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
344.97502464	160.85433746	0.01528327	MINIMUM
14.24415321	225.73668010	0.03494453	MINIMUM
0.26120721	194.75810595	0.06949938	SADDLE
359.76188041	13.61816023	1.93654124	SADDLE
179.95671223	13.85536548	3.75129044	SADDLE
179.93996360	193.84638051	5.75032716	MAXIMUM

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MOID Plots

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