Asteroids

2001YB5 help

Last update: 2025-11-24 16:53 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.319

Aphelion (Q)

4.364

Eccentricity (e)

0.864

Inclination (i)

5.6

deg

Orbit period (P)

1308.7

Earth MOID

0.00293

U parameter

8.4

Next Earth close approach

Date

2120-09-02

Nominal distance (from Earth center)

0.1596

23876060

Maximum Brightness

19.7

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

20.7

mag

Diameter

190 - 400*

Taxonomic type

Rotation period (T)

3.200

Discovery Information

Discovery Date

2001-12-27

Observatory

Palomar Mountain/NEAT

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

2.341508

1-sigma variation

0.002408

Unit

Eccentricity (e)

Value

0.863958

1-sigma variation

0.000503

Unit

Inclination (i)

Value

5.5540

1-sigma variation

0.0075

Unit

Long. of Ascending Node (Ω)

Value

108.1919

1-sigma variation

0.0570

Unit

Arg. of Perihelion (ω)

Value

115.5076

1-sigma variation

0.0605

Unit

Mean Anomaly (M)

Value

224.31220

1-sigma variation

5.13991

Unit

Perihelion distance

Value

0.318544

1-sigma variation

Unit

Aphelion distance

Value

4.364472

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.037528

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.585411

1-sigma variation

Unit

MOID

Value

0.002932

1-sigma variation

Unit

Orbit Period

Value

1308.7053

1-sigma variation

Unit

U parameter

Value

8.4

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	5.79855E-6	1.21110E-6	1.80055E-5	-1.37237E-4	1.45575E-4	-1.23770E-2
e	1.21110E-6	2.52955E-7	3.76070E-6	-2.86637E-5	3.04052E-5	-2.58510E-3
i	1.80055E-5	3.76070E-6	5.59144E-5	-4.26147E-4	4.52041E-4	-3.84327E-2
Ω	-1.37237E-4	-2.86637E-5	-4.26147E-4	3.24804E-3	-3.44538E-3	2.92932E-1
ω	1.45575E-4	3.04052E-5	4.52041E-4	-3.44538E-3	3.65472E-3	-3.10729E-1
M	-1.23770E-2	-2.58510E-3	-3.84327E-2	2.92932E-1	-3.10729E-1	2.64187E1

Date of computation: 2025-11-24 16:53 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

3.200

Unit

Source

[1]

Quality

Value

Unit

Source

[1]

Amplitude

Value

0.21

Unit

mag

Source

[1]

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

[-]

Taxonomy (all)

Value

Unit

Source

[-]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

20.749

Unit

mag

Source

[2]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[2]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[3]

Diameter

Value

190 - 400*

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

Visual S

Unit

Source

[1]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Yang, B. et al. (2003) Astron. J. 126, 1086-1089. (PHOTOMETRY AND SPECTROSCOPY OF THE POTENTIALLY HAZARDOUS ASTEROID 2001 YB5 AND NEAR-EARTH ASTEROID 2001 TX16)
[2]	ESA Aegis	ESA orbit determination and impact monitoring system
[3]	Estimation	Estimated from absolute magnitude

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

Unit

Source

[1]

Unobserved

Value

8724

Unit

Source

[1]

Normalized RMS of residuals

Value

0.337385

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2001-12-26.45193

Unit

Source

[2]

Last Observation

Value

2002-01-06.78258

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

403 (4)

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

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 2001YB5 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	1966-01-09 17:54	> 1 mo	0.0803159	0.0294189	1.0287849
EARTH	1983-12-30 10:33	> 1 w	0.1577023	0.0294665	0.5514124
MERCURY	1991-04-06 22:42	> 1 w	0.0118916	0.0117373	0.0510338
JUPITER	2000-03-09 16:01	395.2	0.6741369	0.6466089	0.0092399
EARTH	2002-01-07 07:36	< 1 s	0.0055636	0.0055556	0.0000027
VENUS	2027-04-24 16:31	> 1 w	0.0347447	0.0029017	0.3864218
VENUS	2052-07-15 23:56	> 1 mo	0.0142474	0.0142343	0.0509344
VENUS	2059-07-28 05:29	> 1 mo	0.0274202	0.0015224	13.8562673
MERCURY	2091-12-09 14:47	> 1 mo	0.0186489	0.0061148	78.7570535
VENUS	2113-06-12 11:10	> 1 mo	0.0296888	0.0295476	3.1072127
VENUS	2120-06-26 02:15	> 1 mo	0.0444402	0.0275942	113.2326909
EARTH	2120-09-02 10:05	> 1 mo	0.1596016	0.1316403	69.2282304
EARTH	2124-01-04 20:15	> 1 mo	0.1061093	0.0494499	145.2728055

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
312.15737072	4.07400347	0.00297306	MINIMUM
48.53161936	240.31962461	0.07870456	MINIMUM
1.24952114	123.74523845	0.69219000	SADDLE
1.30804193	304.01484967	1.30836065	SADDLE
180.06907644	301.78123104	3.37791659	SADDLE
180.13008838	121.80086510	5.36965622	MAXIMUM

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MOID Plots

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