Asteroids

415029 2011UL21 help

Last update: 2024-05-06 23:53 UTC

Orbital Properties

Epoch

60400.0

MJD

Orbit type

Apollo

Perihelion (q)

0.735

Aphelion (Q)

3.508

Eccentricity (e)

0.653

Inclination (i)

34.9

deg

Orbit period (P)

1128.7

Earth MOID

0.01715

U parameter

0.0

Next Earth close approach

Date

2024-06-27

Nominal distance (from Earth center)

0.04439

6641183

Maximum Brightness

11.7

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

2310

Taxonomic type

Rotation period (T)

2.732

Discovery Information

Discovery Date

2011-10-17

Observatory

Catalina Sky Survey

Orbit Visualiser

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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

60400.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

2.121530

1-sigma variation

8.462E-9

Unit

Eccentricity (e)

Value

0.653436

1-sigma variation

2.556E-8

Unit

Inclination (i)

Value

34.8875

1-sigma variation

8.154E-6

Unit

Long. of Ascending Node (Ω)

Value

275.3181

1-sigma variation

5.009E-6

Unit

Arg. of Perihelion (ω)

Value

284.9744

1-sigma variation

6.814E-6

Unit

Mean Anomaly (M)

Value

346.48065

1-sigma variation

0.00001

Unit

Perihelion distance

Value

0.735246

1-sigma variation

Unit

Aphelion distance

Value

3.507814

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.023587

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.479732

1-sigma variation

Unit

MOID

Value

0.017145

1-sigma variation

Unit

Orbit Period

Value

1128.6834

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	7.16023E-17	9.87030E-18	1.29377E-14	-6.12793E-15	1.87520E-14	-3.65268E-14
e	9.87030E-18	6.53153E-16	3.77982E-15	8.39943E-15	3.40973E-14	2.05607E-14
i	1.29377E-14	3.77982E-15	6.64809E-11	2.57104E-12	3.25090E-12	-6.32154E-12
Ω	-6.12793E-15	8.39943E-15	2.57104E-12	2.50948E-11	-2.08997E-11	4.53925E-12
ω	1.87520E-14	3.40973E-14	3.25090E-12	-2.08997E-11	4.64361E-11	-2.00858E-11
M	-3.65268E-14	2.05607E-14	-6.32154E-12	4.53925E-12	-2.00858E-11	2.69936E-11

Date of computation: 2024-04-23 11:53 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

2.732

Unit

Source

[4]

Quality

Value

Unit

Source

[4]

Amplitude

Value

0.32

Unit

mag

Source

[4]

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]

[2]

Taxonomy (all)

Value

Unit

Source

[3]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

15.96

Unit

mag

Source

[5]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[5]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.158

Unit

Source

[6]

Diameter

Value

2310

Unit

Source

[6]

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.) Michaël Marsset et al 2022 AJ 163 165
[2]	EARN	1.) Alexey V. Sergeyev and Benoit Carry A&A, 652 (2021) A59
[3]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[4]	EARN	1.) Warner, B.D. (2018) MPB 45, 366-379. (Near-Earth Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2018 April-June)(39 NEAs) 2.) Warner, B.D. (2018) MPB 45, 138-147. (NEAR-EARTH ASTEROID LIGHTCURVE ANALYSIS AT CS3-PALMER DIVIDE STATION: 2017 OCTOBER-DECEMBER)(20 NEAs)
[5]	ESA ODIM	ESA orbit determination and impact monitoring system
[6]	EARN	1.) Joseph R. Masiero et al 2020 Planet. Sci. J. 1 5

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

12572

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.417888

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1989-10-29.40625

Unit

Source

[2]

Last Observation

Value

2024-03-31.263808

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

1804 (15)

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

[3]

Last Observation

Value

Unit

Source

[3]

Delay (Discarded)

Value

0 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

0 (0)

Unit

Source

[1]

Note: The ASCII file is in a format suitable for Orbfit input.

Sources

No.	Name	Additional
[1]	ESA ODIM	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 415029 2011UL21 from 1950 to 2124

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possibile distance in au	Distance uncert. in au
EARTH	1990-06-21 17:26	< 1 min	0.0968437	0.0968407	0.0000010
EARTH	2024-06-27 20:14	< 1 min	0.0443936	0.0443928	0.0000003
EARTH	2089-06-25 03:47	< 1 min	0.0178230	0.0178219	0.0000004
EARTH	2123-07-01 02:52	3.1	0.0992591	0.0991287	0.0000435

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