Asteroids

14827 Hypnos help

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

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.968

Aphelion (Q)

4.750

Eccentricity (e)

0.661

Inclination (i)

1.9

deg

Orbit period (P)

1765.6

Earth MOID

0.01774

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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

2.858929

1-sigma variation

6.707E-9

Unit

Eccentricity (e)

Value

0.661419

1-sigma variation

1.301E-8

Unit

Inclination (i)

Value

1.9454

1-sigma variation

4.765E-6

Unit

Long. of Ascending Node (Ω)

Value

57.1837

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

239.4090

1-sigma variation

0.0001

Unit

Mean Anomaly (M)

Value

143.88913

1-sigma variation

1.193E-6

Unit

Perihelion distance

Value

0.967979

1-sigma variation

Unit

Aphelion distance

Value

4.749878

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

1.431542

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.192865

1-sigma variation

Unit

MOID

Value

0.017744

1-sigma variation

Unit

Orbit Period

Value

1765.6450

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.49844E-17	-5.02235E-18	1.61556E-15	-1.85852E-14	3.24107E-14	-5.78437E-15
e	-5.02235E-18	1.69253E-16	1.05028E-15	6.10613E-15	-1.74073E-14	6.30156E-15
i	1.61556E-15	1.05028E-15	2.27009E-11	-5.51123E-11	6.14347E-11	-1.36524E-12
Ω	-1.85852E-14	6.10613E-15	-5.51123E-11	3.77107E-9	-3.81193E-9	9.34251E-12
ω	3.24107E-14	-1.74073E-14	6.14347E-11	-3.81193E-9	3.85977E-9	-1.21947E-11
M	-5.78437E-15	6.30156E-15	-1.36524E-12	9.34251E-12	-1.21947E-11	1.42333E-12

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

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

18.859

Unit

mag

Source

[5]

Slope Parameter (G)

Value

0.15**

Unit

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

617

Unit

Source

[1]

Normalized RMS of residuals

Value

0.495716

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

391 (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

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Max residual (arcsec):

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Computation parameters

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Final Date: *

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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 14827 Hypnos 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	1958-05-31 02:07	< 1 min	0.0269833	0.0269802	0.0000010
MARS	1958-09-19 23:18	< 1 min	0.0198796	0.0198776	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
346.73234730	163.00321113	0.01774407	MINIMUM
12.40228332	219.86126826	0.03432380	MINIMUM
0.41474820	193.32188813	0.05654698	SADDLE
359.78949591	11.90583165	1.95163880	SADDLE
179.96149869	12.11296758	3.76653517	SADDLE
179.94562616	192.10445499	5.76598845	MAXIMUM

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MOID Plots

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