Asteroids

2017XT61 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.851

Aphelion (Q)

2.637

Eccentricity (e)

0.512

Inclination (i)

3.3

deg

Orbit period (P)

841.5

Earth MOID

0.00185

U parameter

4.8

Next Earth close approach

Date

2041-02-27

Nominal distance (from Earth center)

0.14683

21965851

Maximum Brightness

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

23.2

mag

Diameter

60 - 140*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2017-12-15

Observatory

Mt. Lemmon Survey

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

1.744300

1-sigma variation

0.000015

Unit

Eccentricity (e)

Value

0.511934

1-sigma variation

0.000005

Unit

Inclination (i)

Value

3.3137

1-sigma variation

3.544E-5

Unit

Long. of Ascending Node (Ω)

Value

282.3404

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

234.8640

1-sigma variation

0.0003

Unit

Mean Anomaly (M)

Value

133.79795

1-sigma variation

0.01497

Unit

Perihelion distance

Value

0.851334

1-sigma variation

Unit

Aphelion distance

Value

2.637266

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.807606

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.010398

1-sigma variation

Unit

MOID

Value

0.001848

1-sigma variation

Unit

Orbit Period

Value

841.4536

1-sigma variation

Unit

U parameter

Value

4.8

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.13232E-10	7.02286E-11	4.18684E-10	1.77376E-10	6.62807E-10	-2.18624E-7
e	7.02286E-11	2.35717E-11	1.49119E-10	3.82657E-11	3.79774E-10	-7.20393E-8
i	4.18684E-10	1.49119E-10	1.25596E-9	-4.12785E-10	5.66435E-9	-4.30170E-7
Ω	1.77376E-10	3.82657E-11	-4.12785E-10	2.58629E-9	-8.35485E-9	-1.80241E-7
ω	6.62807E-10	3.79774E-10	5.66435E-9	-8.35485E-9	6.26947E-8	-6.92414E-7
M	-2.18624E-7	-7.20393E-8	-4.30170E-7	-1.80241E-7	-6.92414E-7	2.24154E-4

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

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

[-]

Taxonomy (all)

Value

Unit

Source

[-]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

23.205

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[2]

Diameter

Value

60 - 140*

Unit

Source

[2]

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

Unit

Source

[3]

Download this part as:

Sources

No.	Name	Additional
[1]	ESA Aegis	ESA orbit determination and impact monitoring system
[2]	Estimation	Estimated from absolute magnitude
[3]	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

Unit

Source

[1]

Unobserved

Value

2810

Unit

Source

[1]

Normalized RMS of residuals

Value

0.331171

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2017-12-15.17105

Unit

Source

[2]

Last Observation

Value

2018-01-06.18724

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

37 (0)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2018-01-03

Unit

Source

[3]

Last Observation

Value

2018-01-03

Unit

Source

[3]

Delay (Discarded)

Value

0 (0)

Unit

Source

[-]

Doppler (Discarded)

Value

1 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

1 (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 2017XT61 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	1955-12-28 01:22	117.9	0.0832341	0.0799456	0.0010962
EARTH	1972-03-31 00:00	691.1	0.1184823	0.1159434	0.0008496
EARTH	1995-02-04 00:35	664.9	0.1218739	0.1198049	0.0006899
EARTH	2011-05-08 18:13	44.0	0.1718632	0.1703878	0.0004920
EARTH	2018-01-08 20:26	< 1 min	0.0290466	0.0290448	0.0000006
EARTH	2041-02-27 08:30	947.2	0.1468326	0.1465312	0.0001011
EARTH	2064-04-06 15:43	977.3	0.1054465	0.1006510	0.0016135
EARTH	2070-12-23 05:45	218.3	0.1704357	0.1623133	0.0027075
EARTH	2087-04-27 13:29	165.7	0.0552466	0.0544492	0.0002948
EARTH	2094-01-04 09:02	182.7	0.0134283	0.0100317	0.0011495
EARTH	2110-02-04 12:59	> 1 w	0.1207475	0.0592273	0.0207186

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
328.38530424	1.96704833	0.00183363	MINIMUM
34.43967347	111.35648551	0.05402272	MINIMUM
2.60167652	58.57298405	0.14640699	SADDLE
180.58820823	235.55282030	1.62984770	SADDLE
1.63855161	236.87842480	1.85998243	SADDLE
180.44486647	55.46559329	3.62697195	MAXIMUM

Download:

MOID Plots

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