Asteroids

4257 Ubasti help

Last update: 2026-10-13 13:31 UTC

Orbital Properties

Epoch

61400.0

MJD

Orbit type

Apollo

Perihelion (q)

0.876

Aphelion (Q)

2.418

Eccentricity (e)

0.468

Inclination (i)

40.7

deg

Orbit period (P)

772.1

Earth MOID

0.17014

U parameter

0.0

Next Earth close approach

Date

2064-03-04

Nominal distance (from Earth center)

0.17271

25836725

Maximum Brightness

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

16.1

mag

Diameter

1300

Taxonomic type

Rotation period (T)

4.400

Discovery Information

Discovery Date

1987-08-23

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

61400.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.647037

1-sigma variation

1.608E-9

Unit

Eccentricity (e)

Value

0.468243

1-sigma variation

1.216E-8

Unit

Inclination (i)

Value

40.7226

1-sigma variation

3.138E-6

Unit

Long. of Ascending Node (Ω)

Value

169.1358

1-sigma variation

2.743E-6

Unit

Arg. of Perihelion (ω)

Value

278.9576

1-sigma variation

3.948E-6

Unit

Mean Anomaly (M)

Value

173.95248

1-sigma variation

3.082E-6

Unit

Perihelion distance

Value

0.875824

1-sigma variation

Unit

Aphelion distance

Value

2.418251

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.206029

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.381694

1-sigma variation

Unit

MOID

Value

0.170141

1-sigma variation

Unit

Orbit Period

Value

772.0645

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.58622E-18	2.24162E-19	1.00278E-16	3.76435E-18	-9.02178E-17	-9.85418E-16
e	2.24162E-19	1.47886E-16	2.97834E-15	1.09852E-16	-8.00260E-15	9.27782E-15
i	1.00278E-16	2.97834E-15	9.84433E-12	2.02934E-12	-2.05535E-12	5.99271E-13
Ω	3.76435E-18	1.09852E-16	2.02934E-12	7.52499E-12	-5.28115E-12	-2.29990E-13
ω	-9.02178E-17	-8.00260E-15	-2.05535E-12	-5.28115E-12	1.55888E-11	-9.25187E-12
M	-9.85418E-16	9.27782E-15	5.99271E-13	-2.29990E-13	-9.25187E-12	9.50129E-12

Date of computation: 2026-10-13 13:31 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

4.400

Unit

Source

[1]

Quality

Value

Unit

Source

[4]

Amplitude

Value

0.34

0.36

Unit

mag

Source

[1]

[4]

Rotation Direction

Value

Unit

Source

[-]

Spinvector L

Value

326

Unit

Source

[1]

Spinvector B

Value

Unit

Source

[1]

Taxonomy
Taxonomy (all)

Taxonomy

Value

Unit

Source

Taxonomy

Value

Unit

Source

[-]

Taxonomy (all)

Value

Unit

Source

[-]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

16.058

Unit

mag

Source

[2]

Slope Parameter (G)

Value

0.15**

Unit

Source

[2]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.376

Unit

Source

[3]

Diameter

Value

1300

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

Unit

Source

[-]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Lowell Observatory Near-Earth Asteroid Photometric Survey (NEAPS): Paper 3. Skiff, Brian A et al.
[2]	ESA Aegis	ESA orbit determination and impact monitoring system
[3]	EARN	1.) Usui, F. et al. (2011) Pub. Astron. Soc. Japan 63, 1117-1138. (Asteroid Catalog Using AKARI: AKARI/IRC Mid-Infrared Asteroid Survey)
[4]	EARN	1.) Skiff, B.A. et al. (2012) MPB 39, 111-130. (LOWELL OBSERVATORY NEAR-EARTH ASTEROID PHOTOMETRIC SURVEY (NEAPS) - 2008 MAY THROUGH 2008 DECEMBER) (46 NEAs)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

14220

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.440029

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1987-08-23.43958

Unit

Source

[2]

Last Observation

Value

2026-07-29.344411

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

3180 (19)

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.

Close Approaches for 4257 Ubasti 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	1971-03-04 05:20	< 1 min	0.1706292	0.1706290	0.0000001
EARTH	2064-03-04 13:34	< 1 s	0.1727078	0.1727076	0.0000001

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
48.24419240	59.60657743	0.17014053	MINIMUM
302.76508183	258.05211926	0.29160819	MINIMUM
353.94060249	335.29600757	0.65604324	SADDLE
175.74320669	164.45647665	1.77043045	SADDLE
356.79275771	161.40599677	1.77421762	SADDLE
183.33650619	350.43873073	3.23422456	MAXIMUM

Download:

MOID Plots

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