Asteroids

171576 1999VP11 help

Last update: 2025-09-10 00:30 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.452

Aphelion (Q)

1.719

Eccentricity (e)

0.584

Inclination (i)

17.3

deg

Orbit period (P)

413.2

Earth MOID

0.00249

U parameter

0.0

Next Earth close approach

Date

2034-10-17

Nominal distance (from Earth center)

0.16357

24469910

Maximum Brightness

17.2

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

18.7

mag

Diameter

500 - 1100*

Taxonomic type

Rotation period (T)

2.796

Discovery Information

Discovery Date

1999-11-07

Observatory

Lincoln Laboratory ETS, New Mexico

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

1.085733

1-sigma variation

2.336E-9

Unit

Eccentricity (e)

Value

0.583661

1-sigma variation

3.076E-8

Unit

Inclination (i)

Value

17.2762

1-sigma variation

3.901E-6

Unit

Long. of Ascending Node (Ω)

Value

208.0603

1-sigma variation

4.117E-6

Unit

Arg. of Perihelion (ω)

Value

61.7636

1-sigma variation

5.058E-6

Unit

Mean Anomaly (M)

Value

99.66940

1-sigma variation

0.00001

Unit

Perihelion distance

Value

0.452034

1-sigma variation

Unit

Aphelion distance

Value

1.719433

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.444627

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.006559

1-sigma variation

Unit

MOID

Value

0.002488

1-sigma variation

Unit

Orbit Period

Value

413.2217

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	5.45658E-18	-3.45928E-17	-2.35612E-16	1.68069E-15	1.14163E-15	-1.77336E-14
e	-3.45928E-17	9.46454E-16	1.74159E-14	-3.37969E-14	-3.77079E-14	6.77714E-14
i	-2.35612E-16	1.74159E-14	1.52186E-11	3.68795E-12	-5.35963E-12	-6.93954E-13
Ω	1.68069E-15	-3.37969E-14	3.68795E-12	1.69488E-11	-1.81003E-11	-1.91608E-12
ω	1.14163E-15	-3.77079E-14	-5.35963E-12	-1.81003E-11	2.55845E-11	-4.53222E-12
M	-1.77336E-14	6.77714E-14	-6.93954E-13	-1.91608E-12	-4.53222E-12	6.07971E-11

Date of computation: 2025-09-10 00:30 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

2.796

Unit

Source

[3]

Quality

Value

Unit

Source

[3]

Amplitude

Value

0.02-0.08

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

Unit

Source

[2]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

18.656

Unit

mag

Source

[4]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[4]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[5]

Diameter

Value

500 - 1100*

Unit

Source

[5]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

0.5496

0.4023

0.9519

Unit

r-i

g-r

g-i

Source

[1]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Radar R

Unit

Source

[6]

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Sources

No.	Name	Additional
[1]	EARN	1.) A. V. Sergeyev, B. Carry et al A&A, 658 (2022) A109
[2]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[3]	EARN	1.) Vecchione, A. et al. (2018) MPB 45, 183-184. (LIGHTCURVE ANALYSIS AND ROTATION PERIOD FOR (140158) 2001 SX169) 2.) 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)
[4]	ESA Aegis	ESA orbit determination and impact monitoring system
[5]	Estimation	Estimated from absolute magnitude
[6]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

9203

Unit

Source

[1]

Unobserved

Value

278

Unit

Source

[1]

Normalized RMS of residuals

Value

0.471698

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1999-11-07.31086

Unit

Source

[2]

Last Observation

Value

2025-01-17.301931

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

492 (1)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2017-10-24

Unit

Source

[3]

Last Observation

Value

2017-10-26

Unit

Source

[3]

Delay (Discarded)

Value

4 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

2 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

6 (0)

Unit

Source

[1]

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
[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 171576 1999VP11 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	1965-10-21 07:23	1.6	0.0113784	0.0112815	0.0000323
EARTH	1982-10-21 18:43	< 1 min	0.0071296	0.0071276	0.0000006
EARTH	1991-10-29 17:09	< 1 min	0.1905655	0.1905641	0.0000005
EARTH	2008-10-16 15:22	< 1 s	0.1841449	0.1841444	0.0000002
EARTH	2017-10-22 11:01	< 1 s	0.0148330	0.0148330	0.0000000
EARTH	2034-10-17 13:35	< 1 s	0.1635712	0.1635703	0.0000003
EARTH	2043-10-27 14:32	< 1 min	0.1319269	0.1319255	0.0000005
EARTH	2060-10-20 08:31	< 1 min	0.0462490	0.0462470	0.0000007
EARTH	2086-10-22 07:43	< 1 min	0.0077890	0.0077880	0.0000003
EARTH	2095-10-27 07:30	< 1 min	0.1181054	0.1180991	0.0000021

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
81.69634482	287.13282897	0.00235613	MINIMUM
286.68761061	57.14557896	0.23094435	MINIMUM
4.67670354	175.70026868	0.59415426	SADDLE
183.83435462	348.60368117	0.81302828	SADDLE
2.35696446	350.86388956	1.42469185	SADDLE
179.03329738	166.10528771	2.71315975	MAXIMUM

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MOID Plots

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