Asteroids

69230 Hermes help

Last update: 2026-08-08 13:15 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.622

Aphelion (Q)

2.688

Eccentricity (e)

0.624

Inclination (i)

6.1

deg

Orbit period (P)

777.7

Earth MOID

0.00466

U parameter

0.0

A₂

-13.0

10^-15au/days²

Next Earth close approach

Date

2040-04-25

Nominal distance (from Earth center)

0.0282

4218216

Maximum Brightness

13.1

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

17.6

mag

Diameter

820

Taxonomic type

Rotation period (T)

13.89

Discovery Information

Discovery Date

1937-10-28

Observatory

Heidelberg-Konigstuhl

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

1.655093

1-sigma variation

1.862E-9

Unit

Eccentricity (e)

Value

0.623932

1-sigma variation

9.724E-9

Unit

Inclination (i)

Value

6.0672

1-sigma variation

3.158E-6

Unit

Long. of Ascending Node (Ω)

Value

34.0340

1-sigma variation

8.508E-6

Unit

Arg. of Perihelion (ω)

Value

92.9311

1-sigma variation

8.395E-6

Unit

Mean Anomaly (M)

Value

197.11292

1-sigma variation

3.687E-6

Unit

Perihelion distance

Value

0.622428

1-sigma variation

Unit

Aphelion distance

Value

2.687758

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.050143

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.026330

1-sigma variation

Unit

MOID

Value

0.004656

1-sigma variation

Unit

Orbit Period

Value

777.7355

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

A₂

Value

-12.95010

1-sigma variation

1.66621

Unit

10^-15au/days²

Covariance Matrix

	a	e	i	Ω	ω	M	A₂
a	3.46713E-18	1.30313E-17	-3.03005E-15	2.92166E-15	-7.73441E-16	-6.40404E-15	3.07427E-9
e	1.30313E-17	9.45526E-17	-2.11014E-14	3.41640E-14	-1.90171E-14	-1.53117E-14	1.29278E-8
i	-3.03005E-15	-2.11014E-14	9.97278E-12	-6.68022E-12	3.54400E-12	3.10215E-12	-3.18333E-6
Ω	2.92166E-15	3.41640E-14	-6.68022E-12	7.23944E-11	-7.01108E-11	-1.31084E-12	3.09958E-6
ω	-7.73441E-16	-1.90171E-14	3.54400E-12	-7.01108E-11	7.04834E-11	-1.32675E-12	-9.86792E-7
M	-6.40404E-15	-1.53117E-14	3.10215E-12	-1.31084E-12	-1.32675E-12	1.35927E-11	-5.38814E-6
A₂	3.07427E-9	1.29278E-8	-3.18333E-6	3.09958E-6	-9.86792E-7	-5.38814E-6	2.77625E0

Date of computation: 2026-08-08 13:15 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

13.89

Unit

Source

[6]

Quality

Value

3,B,R

Unit

Source

[6]

Amplitude

Value

0.06

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

Scomp

Unit

Source

[1]

[2]

[3]

Taxonomy (all)

Value

S;Sq

Unit

Source

[4]

[5]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

17.595

17.57

Unit

mag

Source

[7]

[8]

Slope Parameter (G)

Value

0.15

0.15**

Unit

Source

[8]

[7]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.265

Unit

Source

[10]

[9]

Diameter

Value

820

Unit

Source

[9]

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

[11]

[12]

Satellites

Satellites

Value

Unit

Source

Satellites

Value

Binary Child 1

Unit

Source

[4]

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Sources

No.	Name	Additional
[1]	EARN	1.) Alexey V. Sergeyev and Benoit Carry A&A, 652 (2021) A59
[2]	EARN	1.) Michaël Marsset et al 2022 AJ 163 165
[3]	EARN	1.) Thomas, C.A. et al. (2014) Icarus 228, 217-246. (Physical characterization of Warm Spitzer-observed near-Earth objects)
[4]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[5]	EARN	1.) Rivkin, A.S. & R.P. Binzel (2003) I.A.U. Circ. HREF="http://www.cbat.eps.harvard.edu/iauc/08200/08225.html"> 8225. (1937 UB Hermes) (spectroscopy - taxonomy) 2.) Thomas, C.A. et al. (2014) Icarus 228, 217-246. (Physical characterization of Warm Spitzer-observed near-Earth objects)
[6]	EARN	1.) Pravec, P. et al. (2006) Icarus 181, 63-93. (Photometric survey of binary near-Earth asteroids) 2.) Petr Pravec's Ondrejov NEO Photometric Program Webpage "Prepublished Periods" 3.) Pravec, P. et al. (2003) I.A.U. Circ. HREF="http://www.cbat.eps.harvard.edu/iauc/08200/08233.html"> 8233. (1937 UB Hermes) (photometry lightcurve rotation period) 4.) Margot, J.L. et al. (2003) I.A.U. Circ. HREF="http://www.cbat.eps.harvard.edu/iauc/08200/08227.html"> 8227. (1937 UB Hermes) (radar obs. binary asteroid) 5.) R. Behrend Courbes des lumiere, Observatoire de Geneve website
[7]	ESA Aegis	ESA orbit determination and impact monitoring system
[8]	EARN	1.) Pravec, P. et al. (2012) Icarus 221, 365-387 (Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations)
[9]	EARN	1.) Joseph R. Masiero et al 2020 Planet. Sci. J. 1 5
[10]	EARN	1.) Marchis, F.; Enriquez, J.E.; Emery, J.P.; Mueller, M.; et al. (2012) Icarus 221, 1130-1161.
[11]	EARN	1.) Rivkin, A.S. & R.P. Binzel (2003) I.A.U. Circ. HREF="http://www.cbat.eps.harvard.edu/iauc/08200/08225.html"> 8225. (1937 UB Hermes) (spectroscopy - taxonomy) 2.) Rivkin, A.S. et al. (2004) Icarus 172, 408-414. (Infrared spectroscopic observations of 69230 Hermes ..)
[12]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage 2.) Margot, J.L. et al. (2003) I.A.U. Circ. HREF="http://www.cbat.eps.harvard.edu/iauc/08200/08227.html"> 8227. (1937 UB Hermes) (radar obs. binary asteroid)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

32428

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.415199

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1937-10-25.2181

Unit

Source

[2]

Last Observation

Value

2026-08-07.45942

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

2880 (12)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2003-10-18

Unit

Source

[3]

Last Observation

Value

2003-11-08

Unit

Source

[3]

Delay (Discarded)

Value

3 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

3 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

6 (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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Output option:

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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 69230 Hermes 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
VENUS	1950-10-05 09:07	< 1 s	0.0441458	0.0441457	0.0000000
EARTH	1954-11-01 21:16	< 1 s	0.0204414	0.0204414	0.0000000
EARTH	1974-04-24 15:08	< 1 s	0.0351142	0.0351140	0.0000001
EARTH	1986-10-29 00:39	< 1 s	0.0533195	0.0533192	0.0000001
EARTH	2003-11-04 04:48	< 1 s	0.0478417	0.0478417	0.0000000
EARTH	2040-04-25 01:02	< 1 min	0.0281970	0.0281963	0.0000002
4 Vesta	2048-01-29 01:21	< 1 s	0.0190988	0.0190982	0.0000002
EARTH	2057-04-28 18:08	< 1 min	0.0264553	0.0264524	0.0000010
VENUS	2061-06-30 10:51	< 1 min	0.0437686	0.0437672	0.0000005
EARTH	2069-10-27 18:12	< 1 min	0.0859988	0.0859906	0.0000027
EARTH	2074-05-06 02:15	< 1 min	0.1542568	0.1542472	0.0000032
EARTH	2086-10-31 14:00	< 1 min	0.0244000	0.0243915	0.0000028
EARTH	2091-05-08 18:23	< 1 min	0.1965061	0.1964958	0.0000034
EARTH	2103-10-31 18:48	1.7	0.0432837	0.0432203	0.0000211
VENUS	2108-04-09 05:13	2.0	0.0064921	0.0064516	0.0000135
EARTH	2108-05-07 00:42	< 1 min	0.1533956	0.1533545	0.0000137
EARTH	2123-04-29 11:31	154.5	0.0099292	0.0099224	0.0000655

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
51.01204425	111.16519818	0.00465584	MINIMUM
309.76485098	294.90146625	0.00829325	MINIMUM
0.60640866	23.24182596	0.37169578	SADDLE
0.74434176	203.50478991	1.63576927	SADDLE
180.14805069	202.78655196	1.68131737	SADDLE
180.18186290	22.79872854	3.66850456	MAXIMUM

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