Asteroids

4257 Ubasti help

Last update: 2026-07-30 13:55 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.876

Aphelion (Q)

2.418

Eccentricity (e)

0.468

Inclination (i)

40.7

deg

Orbit period (P)

772.0

Earth MOID

0.16985

U parameter

0.0

Next Earth close approach

Date

2064-03-04

Nominal distance (from Earth center)

0.17271

25836724

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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.646996

1-sigma variation

1.610E-9

Unit

Eccentricity (e)

Value

0.468307

1-sigma variation

1.221E-8

Unit

Inclination (i)

Value

40.7228

1-sigma variation

3.139E-6

Unit

Long. of Ascending Node (Ω)

Value

169.1394

1-sigma variation

2.750E-6

Unit

Arg. of Perihelion (ω)

Value

278.9539

1-sigma variation

3.954E-6

Unit

Mean Anomaly (M)

Value

80.69072

1-sigma variation

3.060E-6

Unit

Perihelion distance

Value

0.875696

1-sigma variation

Unit

Aphelion distance

Value

2.418295

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.205628

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.379787

1-sigma variation

Unit

MOID

Value

0.169849

1-sigma variation

Unit

Orbit Period

Value

772.0351

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.59119E-18	1.69857E-19	1.15985E-16	5.68496E-18	-1.05154E-16	-7.63563E-16
e	1.69857E-19	1.49091E-16	2.98475E-15	1.53979E-16	-8.00756E-15	9.40698E-15
i	1.15985E-16	2.98475E-15	9.85322E-12	2.01503E-12	-2.03387E-12	5.99319E-13
Ω	5.68496E-18	1.53979E-16	2.01503E-12	7.55993E-12	-5.32264E-12	-2.10385E-13
ω	-1.05154E-16	-8.00756E-15	-2.03387E-12	-5.32264E-12	1.56371E-11	-9.27503E-12
M	-7.63563E-16	9.40698E-15	5.99319E-13	-2.10385E-13	-9.27503E-12	9.36541E-12

Date of computation: 2026-07-30 13:55 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

0.36

0.34

Unit

mag

Source

[4]

[1]

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

0.440951

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

3171 (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

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Final Date: *

Normalised Only accepted

Max residual (arcsec):

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Computation parameters

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Final Date: *

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 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

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
48.25762388	58.15175331	0.16984907	MINIMUM
302.69385987	256.56953320	0.29031112	MINIMUM
353.92219276	333.86736990	0.65625307	SADDLE
175.72409005	162.97331946	1.76969403	SADDLE
356.73749444	159.89632429	1.77568196	SADDLE
183.30089509	348.94583404	3.23450975	MAXIMUM

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MOID Plots

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