Asteroids

5751 Zao help

Last update: 2026-07-19 12:45 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Amor

Perihelion (q)

1.208

Aphelion (Q)

2.996

Eccentricity (e)

0.425

Inclination (i)

16.1

deg

Orbit period (P)

1113.0

Earth MOID

0.24058

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)

14.9

mag

Diameter

2300

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

1992-01-05

Observatory

Sendai Observatory, Ayashi Station

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

2.101778

1-sigma variation

7.907E-9

Unit

Eccentricity (e)

Value

0.425345

1-sigma variation

3.280E-8

Unit

Inclination (i)

Value

16.0739

1-sigma variation

3.592E-6

Unit

Long. of Ascending Node (Ω)

Value

121.6258

1-sigma variation

1.029E-5

Unit

Arg. of Perihelion (ω)

Value

25.4570

1-sigma variation

1.646E-5

Unit

Mean Anomaly (M)

Value

88.47262

1-sigma variation

0.00003

Unit

Perihelion distance

Value

1.207796

1-sigma variation

Unit

Aphelion distance

Value

2.995760

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.259624

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

1.778756

1-sigma variation

Unit

MOID

Value

0.240582

1-sigma variation

Unit

Orbit Period

Value

1112.9579

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	6.25182E-17	-7.79524E-17	4.61150E-15	-9.60050E-15	1.01086E-13	-2.04698E-13
e	-7.79524E-17	1.07605E-15	-3.47547E-15	2.24815E-14	-1.29676E-13	2.59078E-13
i	4.61150E-15	-3.47547E-15	1.28994E-11	5.03740E-12	2.31141E-12	-1.55536E-11
Ω	-9.60050E-15	2.24815E-14	5.03740E-12	1.05902E-10	-1.15167E-10	3.04569E-11
ω	1.01086E-13	-1.29676E-13	2.31141E-12	-1.15167E-10	2.71087E-10	-3.39394E-10
M	-2.04698E-13	2.59078E-13	-1.55536E-11	3.04569E-11	-3.39394E-10	6.82478E-10

Date of computation: 2026-07-19 12:45 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

[3]

Quality

Value

Unit

Source

[3]

Amplitude

Value

0.04-0.2

Unit

mag

Source

[3]

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

X;K

Unit

Source

[2]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

14.909

14.94

Unit

mag

Source

[4]

[5]

Slope Parameter (G)

Value

0.15**

0.23

Unit

Source

[4]

[6]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.53

Unit

Source

[8]

Diameter

Value

2300

Unit

Source

[7]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

0.81

0.43

0.34

Unit

B-V

V-R

R-I

Source

[9]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Visual S

Unit

Source

[10]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Lazzarin, M., Marchi,S. & Magrin, S. (2010) href="http://www.astro.unipd.it/planets/sineo/data.html"> SINEO Database (Spectroscopic Investiation of Near-Earth Objects)
[2]	EARN	1.) Bus, S.J. & Binzel, R.P. (2002) Icarus 158,106-145. (Phase II of the Small Main-Belt Asteroid Spectrographic Survey: A Feature-Based Taxonomy.) 2.) 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.) 3.) Lazzarin, M. et al. (2004) Icarus 169, 373-384. (Visible and near-infrared spectroscopic investigation of near-Earth objects at ESO: first results) 4.) Whiteley, R.J. (2001) PhD. Thesis, University of Hawaii. (A Compositional and Dynamical Survey of the Near-Earth Asteroids) 5.) Lazzarin, M., Marchi,S. & Magrin, S. (2010) href="http://www.astro.unipd.it/planets/sineo/data.html"> SINEO Database (Spectroscopic Investiation of Near-Earth Objects)
[3]	EARN	1.) Pravec, P. et al. (1997) Icarus 130, 275-286. (The Near-Earth Objects Follow-Up Program. II. Results for 8 Asteroids from 1982 to 1995)(1943,2102,2212,3199,5751,6322, 7474, 1989VA) 2.) Wisniewski, W.Z. et al. (1997) Icarus 126, 395-449. (Photometric Observations of 125 Asteroids) 3.) Petr Pravec's Ondrejov NEO Photometric Program Webpage "Prepublished Periods" 4.) Delbo, M. et al. (2003) Icarus 166, 116-130. (Keck observations of near-Earth asteroids in the thermal infrared)
[4]	ESA Aegis	ESA orbit determination and impact monitoring system
[5]	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) 2.) Pravec, P. et al. (1997) Icarus 130, 275-286. (The Near-Earth Objects Follow-Up Program. II. Results for 8 Asteroids from 1982 to 1995)(1943,2102,2212,3199,5751,6322, 7474, 1989VA) 3.) Wisniewski, W.Z. et al. (1997) Icarus 126, 395-449. (Photometric Observations of 125 Asteroids)
[6]	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) 2.) Pravec, P. et al. (1997) Icarus 130, 275-286. (The Near-Earth Objects Follow-Up Program. II. Results for 8 Asteroids from 1982 to 1995)(1943,2102,2212,3199,5751,6322, 7474, 1989VA)
[7]	EARN	1.) Delbo, M. et al. (2003) Icarus 166, 116-130. (Keck observations of near-Earth asteroids in the thermal infrared)
[8]	EARN	1.) Thomas, C.A. et al. (2011) Astron. J. 142, 85. (ExploreNEOs. V. AVERAGE ALBEDO BY TAXONOMIC COMPLEX IN THE NEAR-EARTH ASTEROID POPULATION) (new albedos data for 118 NEOs) 2.) Delbo, M. et al. (2003) Icarus 166, 116-130. (Keck observations of near-Earth asteroids in the thermal infrared)
[9]	EARN	1.) Pravec, P. et al. (1997) Icarus 130, 275-286. (The Near-Earth Objects Follow-Up Program. II. Results for 8 Asteroids from 1982 to 1995)(1943,2102,2212,3199,5751,6322, 7474, 1989VA)
[10]	EARN	1.) Lazzarin, M. et al. (2004) Icarus 169, 373-384. (Visible and near-infrared spectroscopic investigation of near-Earth objects at ESO: first results) 2.) 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.) 3.) 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) 4.) Lazzarin, M., Marchi,S. & Magrin, S. (2010) href="http://www.astro.unipd.it/planets/sineo/data.html"> SINEO Database (Spectroscopic Investiation of Near-Earth Objects)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

13644

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.518731

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1989-03-10.77014

Unit

Source

[2]

Last Observation

Value

2026-07-18.405933

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

2768 (9)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

Unit

Source

[-]

Last Observation

Value

Unit

Source

[-]

Delay (Discarded)

Value

0 (0)

Unit

Source

[-]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[-]

Total Radar Observations (Discarded)

Value

0 (0)

Unit

Source

[-]

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

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.

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
352.05715895	29.32425999	0.24058240	MINIMUM
182.39075792	223.50394112	1.99482629	SADDLE
3.07917949	225.95665509	2.21531120	SADDLE
179.53370272	41.72146708	3.97821673	MAXIMUM

Download:

MOID Plots

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