Asteroids

1997QK1 help

Last update: 2026-03-17 23:26 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.985

Aphelion (Q)

4.584

Eccentricity (e)

0.646

Inclination (i)

2.9

deg

Orbit period (P)

1696.7

Earth MOID

0.01650

U parameter

0.0

Next Earth close approach

Date

2039-07-11

Nominal distance (from Earth center)

0.01586

2371941

Maximum Brightness

14.6

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

20.3

mag

Diameter

300

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

1997-08-27

Observatory

Maunakea

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

2.784031

1-sigma variation

3.890E-9

Unit

Eccentricity (e)

Value

0.646363

1-sigma variation

2.135E-9

Unit

Inclination (i)

Value

2.8516

1-sigma variation

1.612E-6

Unit

Long. of Ascending Node (Ω)

Value

306.4685

1-sigma variation

1.338E-5

Unit

Arg. of Perihelion (ω)

Value

3.2407

1-sigma variation

1.276E-5

Unit

Mean Anomaly (M)

Value

65.02003

1-sigma variation

5.071E-7

Unit

Perihelion distance

Value

0.984536

1-sigma variation

Unit

Aphelion distance

Value

4.583526

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.030437

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

3.585660

1-sigma variation

Unit

MOID

Value

0.016500

1-sigma variation

Unit

Orbit Period

Value

1696.7171

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.51337E-17	-6.78540E-18	3.10190E-15	1.52034E-14	-9.14907E-15	-1.56584E-15
e	-6.78540E-18	4.55633E-18	-1.48120E-16	4.98817E-15	-8.12915E-15	7.59060E-16
i	3.10190E-15	-1.48120E-16	2.59737E-12	2.06428E-11	-1.92966E-11	-3.58477E-13
Ω	1.52034E-14	4.98817E-15	2.06428E-11	1.78969E-10	-1.67822E-10	-2.56356E-12
ω	-9.14907E-15	-8.12915E-15	-1.92966E-11	-1.67822E-10	1.62792E-10	1.34497E-12
M	-1.56584E-15	7.59060E-16	-3.58477E-13	-2.56356E-12	1.34497E-12	2.57148E-13

Date of computation: 2026-03-17 23:26 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

Unit

Source

[-]

Quality

Value

Unit

Source

[-]

Amplitude

Value

Unit

mag

Source

[-]

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]

[2]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

20.262

Unit

mag

Source

[4]

Slope Parameter (G)

Value

0.15**

Unit

Source

[4]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

medium high

Unit

Source

[5]

Diameter

Value

300

Unit

Source

[5]

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.) Alexey V. Sergeyev and Benoit Carry A&A, 652 (2021) A59
[2]	EARN	1.) Whiteley, R.J. (2001) PhD. Thesis, University of Hawaii. (A Compositional and Dynamical Survey of the Near-Earth Asteroids)
[3]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[4]	ESA Aegis	ESA orbit determination and impact monitoring system
[5]	EARN	1.) 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)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

10305

Unit

Source

[1]

Unobserved

Value

148

Unit

Source

[1]

Normalized RMS of residuals

Value

0.56682

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1997-08-27.29737

Unit

Source

[2]

Last Observation

Value

2025-11-13.15804

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

718 (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

2025-08-15

Unit

Source

[3]

Last Observation

Value

2025-08-23

Unit

Source

[3]

Delay (Discarded)

Value

6 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

3 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

9 (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

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 1997QK1 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	1997-09-12 16:54	< 1 s	0.1528927	0.1528924	0.0000001
EARTH	2025-08-20 10:24	< 1 s	0.0201320	0.0201320	0.0000000
EARTH	2039-07-11 09:31	< 1 min	0.0158554	0.0158554	0.0000000
EARTH	2067-06-28 08:32	< 1 min	0.0923883	0.0923744	0.0000046

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
349.73296214	186.56436305	0.01711571	MINIMUM
9.00417309	228.37666731	0.02017714	MINIMUM
359.65502823	208.10456994	0.03221388	SADDLE
359.45967225	27.66225299	1.96948865	SADDLE
179.88369547	28.21130604	3.59669218	SADDLE
179.87591009	208.20460617	5.59832993	MAXIMUM

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MOID Plots

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