Asteroids

4034 Vishnu help

Last update: 2025-10-21 15:00 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.589

Aphelion (Q)

1.530

Eccentricity (e)

0.444

Inclination (i)

11.2

deg

Orbit period (P)

398.3

Earth MOID

0.01911

U parameter

0.0

A₂

-35.5

10^-15au/days²

Next Earth close approach

Date

2037-03-28

Nominal distance (from Earth center)

0.1796

26867656

Maximum Brightness

18.7

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

18.5

mag

Diameter

420

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

1986-08-02

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

1.059366

1-sigma variation

2.062E-9

Unit

Eccentricity (e)

Value

0.444012

1-sigma variation

2.552E-8

Unit

Inclination (i)

Value

11.1693

1-sigma variation

2.379E-6

Unit

Long. of Ascending Node (Ω)

Value

157.8647

1-sigma variation

1.498E-5

Unit

Arg. of Perihelion (ω)

Value

296.7026

1-sigma variation

1.376E-5

Unit

Mean Anomaly (M)

Value

261.95042

1-sigma variation

0.00001

Unit

Perihelion distance

Value

0.588994

1-sigma variation

Unit

Aphelion distance

Value

1.529738

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.282076

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.052361

1-sigma variation

Unit

MOID

Value

0.019111

1-sigma variation

Unit

Orbit Period

Value

398.2608

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

A₂

Value

-35.46042

1-sigma variation

3.55649

Unit

10^-15au/days²

Covariance Matrix

	a	e	i	Ω	ω	M	A₂
a	4.25121E-18	1.85019E-17	3.61818E-17	1.79076E-15	-1.04691E-15	-5.83072E-15	6.81941E-9
e	1.85019E-17	6.51463E-16	1.14964E-14	-4.40926E-14	2.61805E-14	-4.43626E-14	2.40083E-8
i	3.61818E-17	1.14964E-14	5.65788E-12	-6.04632E-12	1.33596E-12	6.35022E-12	-4.44394E-7
Ω	1.79076E-15	-4.40926E-14	-6.04632E-12	2.24507E-10	-1.98030E-10	-3.29624E-11	4.78241E-6
ω	-1.04691E-15	2.61805E-14	1.33596E-12	-1.98030E-10	1.89367E-10	1.05326E-11	-2.89295E-6
M	-5.83072E-15	-4.43626E-14	6.35022E-12	-3.29624E-11	1.05326E-11	4.24122E-11	-9.09180E-6
A₂	6.81941E-9	2.40083E-8	-4.44394E-7	4.78241E-6	-2.89295E-6	-9.09180E-6	1.26486E1

Date of computation: 2025-10-21 15:00 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

[-]

Amplitude

Value

Unit

mag

Source

[-]

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

[1]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

18.536

Unit

mag

Source

[2]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[2]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.52

Unit

Source

[3]

Diameter

Value

420

Unit

Source

[3]

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

Visual S

Unit

Source

[4]

[1]

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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]	ESA Aegis	ESA orbit determination and impact monitoring system
[3]	EARN	1.) Delbo, M. et al. (2003) Icarus 166, 116-130. (Keck observations of near-Earth asteroids in the thermal infrared)
[4]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage 2.) Ostro, S.J. et al. (1991) Astron. J. 102, 1490-1502. (Asteroid radar astrometry) 3.) Shepard, M.K. et al. (2004) Icarus 172, 170-178. (Radar detection of near-Earth asteroids 1915 Quetzalcoatl, 3199 Nefertiti, 3757 (1982 XB), and 4034 (1986 PA))

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

14206

Unit

Source

[1]

Unobserved

Value

143

Unit

Source

[1]

Normalized RMS of residuals

Value

0.464948

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1986-08-02.275

Unit

Source

[2]

Last Observation

Value

2025-06-24.387259

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

1302 (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

1989-03-26

Unit

Source

[3]

Last Observation

Value

1989-03-26

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

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 4034 Vishnu 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	1953-04-02 22:59	< 1 min	0.1445198	0.1445144	0.0000018
EARTH	1965-04-02 14:28	< 1 min	0.1470383	0.1470363	0.0000007
VENUS	1967-05-13 14:52	< 1 min	0.0335918	0.0335917	0.0000000
EARTH	1977-04-02 23:04	< 1 min	0.1456586	0.1456577	0.0000003
EARTH	1989-04-01 23:08	< 1 min	0.1516154	0.1516148	0.0000002
EARTH	2001-04-03 01:05	< 1 min	0.1464947	0.1464944	0.0000001
EARTH	2013-04-01 23:07	< 1 s	0.1527716	0.1527714	0.0000001
EARTH	2025-04-01 10:02	< 1 s	0.1567576	0.1567574	0.0000001
EARTH	2037-03-28 10:30	< 1 min	0.1795992	0.1795986	0.0000002
EARTH	2070-09-07 23:30	< 1 min	0.1893441	0.1893412	0.0000010
EARTH	2082-09-08 22:04	< 1 min	0.1643320	0.1643305	0.0000005
EARTH	2094-09-08 17:47	< 1 s	0.1717378	0.1717374	0.0000001
EARTH	2106-09-09 20:05	< 1 s	0.1711088	0.1711077	0.0000004
EARTH	2118-09-09 08:56	< 1 min	0.1854267	0.1854256	0.0000004
VENUS	2121-02-27 20:28	< 1 min	0.0427141	0.0427132	0.0000003

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
275.31166159	242.53386475	0.01911147	MINIMUM
77.00435242	95.76675305	0.13330607	MINIMUM
355.54359626	346.81859483	0.41764736	SADDLE
176.59224552	171.46586766	0.55649850	SADDLE
358.42108775	171.39105005	1.60125426	SADDLE
180.56638987	353.99277762	2.50436541	MAXIMUM

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MOID Plots

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