Asteroids

7341 1991VK help

Last update: 2025-07-29 02:36 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Apollo

Perihelion (q)

0.910

Aphelion (Q)

2.774

Eccentricity (e)

0.506

Inclination (i)

5.4

deg

Orbit period (P)

912.9

Earth MOID

0.04790

U parameter

0.0

A₂

-4.9

10^-15au/days²

Next Earth close approach

Date

2027-01-22

Nominal distance (from Earth center)

0.06813

10192407

Maximum Brightness

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

16.9

mag

Diameter

900

Taxonomic type

Rotation period (T)

4.210

Discovery Information

Discovery Date

1991-11-01

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

60800.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.841654

1-sigma variation

4.258E-10

Unit

Eccentricity (e)

Value

0.506112

1-sigma variation

2.034E-9

Unit

Inclination (i)

Value

5.4096

1-sigma variation

1.305E-6

Unit

Long. of Ascending Node (Ω)

Value

294.7251

1-sigma variation

1.318E-5

Unit

Arg. of Perihelion (ω)

Value

173.5005

1-sigma variation

1.248E-5

Unit

Mean Anomaly (M)

Value

116.75334

1-sigma variation

6.985E-7

Unit

Perihelion distance

Value

0.909571

1-sigma variation

Unit

Aphelion distance

Value

2.773738

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

1.739422

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.072447

1-sigma variation

Unit

MOID

Value

0.047902

1-sigma variation

Unit

Orbit Period

Value

912.8735

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

A₂

Value

-4.86231

1-sigma variation

1.76786

Unit

10^-15au/days²

Covariance Matrix

	a	e	i	Ω	ω	M	A₂
a	1.81264E-19	2.15541E-19	2.50563E-17	2.12969E-15	-2.30242E-15	-6.95150E-17	5.19250E-10
e	2.15541E-19	4.13628E-18	-1.58674E-16	3.93756E-15	-6.19568E-15	7.13509E-16	9.40807E-10
i	2.50563E-17	-1.58674E-16	1.70417E-12	-1.46330E-12	1.55757E-12	-9.21924E-14	-8.24391E-7
Ω	2.12969E-15	3.93756E-15	-1.46330E-12	1.73674E-10	-1.62192E-10	-3.74259E-12	1.98756E-5
ω	-2.30242E-15	-6.19568E-15	1.55757E-12	-1.62192E-10	1.55732E-10	2.34397E-12	-1.95682E-5
M	-6.95150E-17	7.13509E-16	-9.21924E-14	-3.74259E-12	2.34397E-12	4.87873E-13	-3.09452E-7
A₂	5.19250E-10	9.40807E-10	-8.24391E-7	1.98756E-5	-1.95682E-5	-3.09452E-7	3.12534E0

Date of computation: 2025-07-29 02:36 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

4.210

Unit

Source

[5]

Quality

Value

Unit

Source

[5]

Amplitude

Value

0.28-0.7

Unit

mag

Source

[5]

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

S,Sq,Sr

Unit

Source

[3]

[4]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

16.947

16.95

Unit

mag

Source

[6]

[7]

Slope Parameter (G)

Value

0.15**

0.26

Unit

mag

Source

[6]

[7]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.2355

Unit

Source

[8]

Diameter

Value

900

Unit

Source

[8]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

Unit

mag

Source

[-]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Radar R

Visual S

Unit

Source

[9]

[10]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Michaël Marsset et al 2022 AJ 163 165
[2]	EARN	1.) DeMeo, F.E. et al. (2014) Icarus 227, 112-122. (Mars encounters cause fresh surfaces on some near-Earth asteroids) (contains taxonomic classification of 249 NEAs)
[3]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[4]	EARN	1.) Binzel, R.P. & S. Xu (1992) I.A.U. Circ. HREF="http://www.cbat.eps.harvard.edu/iauc/05400/05422.html"> 5422. (1991 VK, 1991 VL, 1991 WA and 1991 XB) 2.) Binzel, R.P. et al. (2002) in "Asteroids III" (Eds. W.F.Bottke et al.), Univ.Ariz.Press, Tucson, USA, pp. 255-271. (Physical Properties of NEOs) 3.) Lazzarin, M. et al. (2004) Icarus 169, 373-384. (Visible and near-infrared spectroscopic investigation of near-Earth objects at ESO: first results) 4.) Bus, S.J. & Binzel, R.P. (2002) Icarus 158,106-145. (Phase II of the Small Main-Belt Asteroid Spectrographic Survey: A Feature-Based Taxonomy.) 5.) Binzel, R.P. et al. (2004) Icarus 170, 259-294. (Observed spectral properties of near-Earth objects: results for population distribution, source regions, and space weathering processes.) 6.) Lazzarin, M., Marchi,S. & Magrin, S. (2010) href="http://www.astro.unipd.it/planets/sineo/data.html"> SINEO Database (Spectroscopic Investiation of Near-Earth Objects) 7.) DeMeo, F.E. et al. (2014) Icarus 227, 112-122. (Mars encounters cause fresh surfaces on some near-Earth asteroids) (contains taxonomic classification of 249 NEAs)
[5]	EARN	1.) Pravec, P. et al. (1998) Icarus 136, 124-153. (Lightcurves of 26 Near-Earth Asteroids)(1943,2063,2100,3103,3122,3200, 3691,3752,4341,4957,5143,5587,7025,7341,7480,7482,7822,8034, 1989UQ,1992CC1,1992QN,1995FX,1997BR,1997GH3,1997GL3,1997SE5) 2.) Warner, B.D. (2017) MPB 44, 22-36. (NEAR-EARTH ASTEROID LIGHTCURVE ANALYSIS AT CS3-PALMER DIVIDE STATION: 2016 JULY-SEPTEMBER) (46 NEAs)
[6]	ESA Aegis	ESA orbit determination and impact monitoring system
[7]	EARN	1.) Pravec, P. et al. (2012) Icarus 221, 365-387 (Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations) 2.) Pravec, P. et al. (1998) Icarus 136, 124-153. (Lightcurves of 26 Near-Earth Asteroids)(1943,2063,2100,3103,3122,3200, 3691,3752,4341,4957,5143,5587,7025,7341,7480,7482,7822,8034, 1989UQ,1992CC1,1992QN,1995FX,1997BR,1997GH3,1997GL3,1997SE5)
[8]	EARN	1.) Masiero, J.R. et al. (2018) Astron. J. 154_168(10pp). (NEOWISE Reactivation Mission Year Three: Asteroid Diameters and Albedos) (170NEOs, 6110MBAs) 2.) Usui, F. et al. (2011) Pub. Astron. Soc. Japan 63, 1117-1138. (Asteroid Catalog Using AKARI: AKARI/IRC Mid-Infrared Asteroid Survey) 3.) Binzel, R.P. et al. (2002) in "Asteroids III" (Eds. W.F.Bottke et al.), Univ.Ariz.Press, Tucson, USA, pp. 255-271. (Physical Properties of NEOs)
[9]	EARN	1.) Ostro, S.J. et al. (1998) B.A.A.S 30, 1036. (Near-Earth-Asteroid Radar at Goldstone, Aug 1996 - Jun 1998) [7822(1991CS),4197(1982TA),4179Toutatis,7341(1991VK), 7482(1994PC1),1997BR,1998BY7,6037(1988EG),1998KY26] 2.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage
[10]	EARN	1.) Lazzarin, M. et al. (2004) Icarus 169, 373-384. (Visible and near-infrared spectroscopic investigation of near-Earth objects at ESO: first results) 2.) Binzel, R.P. et al. (2004) Icarus 170, 259-294. (Observed spectral properties of near-Earth objects: results for population distribution, source regions, and space weathering processes.) 3.) Lazzarin, M., Marchi,S. & Magrin, S. (2010) href="http://www.astro.unipd.it/planets/sineo/data.html"> SINEO Database (Spectroscopic Investiation of Near-Earth Objects) 4.) deLeon, J. et al. (2010) Astron. Astrophys 517, A23. (Observations, compositional, and physical characterization of near-Earth and Mars-crosser asteroids from a spectroscopic survey)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

15247

Unit

Source

[1]

Unobserved

Value

758

Unit

Source

[1]

Normalized RMS of residuals

Value

0.394042

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1981-10-23.78275

Unit

Source

[2]

Last Observation

Value

2023-07-22.486003

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

2372 (5)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

1997-01-10

Unit

Source

[3]

Last Observation

Value

2017-01-16

Unit

Source

[3]

Delay (Discarded)

Value

10 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

3 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

13 (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 7341 1991VK 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	1961-11-19 14:15	< 1 min	0.1283826	0.1283810	0.0000005
EARTH	1966-11-27 22:06	< 1 min	0.0788111	0.0788105	0.0000002
EARTH	1971-12-04 18:12	< 1 min	0.0651305	0.0651304	0.0000000
EARTH	1976-12-12 07:48	< 1 min	0.0648555	0.0648554	0.0000000
EARTH	1981-12-18 12:33	< 1 min	0.0679727	0.0679726	0.0000000
EARTH	1986-12-24 16:58	< 1 min	0.0703340	0.0703339	0.0000000
EARTH	1992-01-02 22:35	< 1 s	0.0739673	0.0739673	0.0000000
EARTH	1997-01-10 16:37	< 1 s	0.0749476	0.0749476	0.0000000
EARTH	2002-01-16 11:50	< 1 s	0.0718492	0.0718492	0.0000000
EARTH	2007-01-21 12:02	< 1 s	0.0679290	0.0679290	0.0000000
EARTH	2012-01-25 23:46	< 1 s	0.0650382	0.0650382	0.0000000
EARTH	2017-01-25 12:50	< 1 s	0.0647091	0.0647091	0.0000000
EARTH	2022-01-25 17:08	< 1 s	0.0639771	0.0639771	0.0000000
EARTH	2027-01-22 03:01	< 1 s	0.0681320	0.0681320	0.0000000
EARTH	2032-01-16 17:14	< 1 s	0.0730760	0.0730760	0.0000000
EARTH	2037-01-11 19:49	< 1 min	0.0732191	0.0732191	0.0000000
EARTH	2042-01-06 13:57	< 1 min	0.0734955	0.0734955	0.0000000
EARTH	2046-12-31 02:26	< 1 min	0.0734544	0.0734544	0.0000000
EARTH	2051-12-25 18:06	< 1 min	0.0714390	0.0714389	0.0000000
EARTH	2056-12-21 13:12	< 1 min	0.0702297	0.0702296	0.0000000
EARTH	2061-12-13 07:00	< 1 min	0.0651113	0.0651112	0.0000000
EARTH	2066-12-05 06:38	< 1 min	0.0641151	0.0641150	0.0000000
EARTH	2071-11-29 13:33	< 1 min	0.0756089	0.0756082	0.0000002
EARTH	2076-11-20 05:09	< 1 min	0.1276902	0.1276884	0.0000006

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
20.29019748	39.97191356	0.04790231	MINIMUM
341.07462658	334.08301813	0.06305165	MINIMUM
358.12889234	2.71815058	0.07514789	SADDLE
180.00455113	186.05739840	1.75761423	SADDLE
0.14009381	186.15014902	1.92575898	SADDLE
180.08543080	6.10261057	3.75742861	MAXIMUM

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MOID Plots

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