Asteroids

2015XR1 help

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

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.746

Aphelion (Q)

2.035

Eccentricity (e)

0.463

Inclination (i)

2.5

deg

Orbit period (P)

598.8

Earth MOID

0.04066

U parameter

0.0

Next Earth close approach

Date

2038-10-16

Nominal distance (from Earth center)

0.19755

29552960

Maximum Brightness

25.7

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

2015-12-03

Observatory

Pan-STARRS 1, Haleakala

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

1.390388

1-sigma variation

4.748E-9

Unit

Eccentricity (e)

Value

0.463263

1-sigma variation

8.395E-8

Unit

Inclination (i)

Value

2.5482

1-sigma variation

3.565E-6

Unit

Long. of Ascending Node (Ω)

Value

143.8757

1-sigma variation

0.0003

Unit

Arg. of Perihelion (ω)

Value

195.9450

1-sigma variation

0.0003

Unit

Mean Anomaly (M)

Value

185.04140

1-sigma variation

3.830E-6

Unit

Perihelion distance

Value

0.746273

1-sigma variation

Unit

Aphelion distance

Value

2.034504

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.981924

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.257455

1-sigma variation

Unit

MOID

Value

0.040660

1-sigma variation

Unit

Orbit Period

Value

598.8287

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.25458E-17	-3.64300E-16	4.22545E-15	-3.79099E-13	3.25617E-13	-5.24994E-15
e	-3.64300E-16	7.04763E-15	-4.57655E-14	2.12182E-12	-1.06507E-12	5.51231E-14
i	4.22545E-15	-4.57655E-14	1.27105E-11	-9.42042E-10	9.36382E-10	-1.68915E-12
Ω	-3.79099E-13	2.12182E-12	-9.42042E-10	1.04247E-7	-1.03718E-7	-1.23029E-10
ω	3.25617E-13	-1.06507E-12	9.36382E-10	-1.03718E-7	1.03374E-7	1.13050E-10
M	-5.24994E-15	5.51231E-14	-1.68915E-12	-1.23029E-10	1.13050E-10	1.46721E-11

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

[-]

Taxonomy (all)

Value

Unit

Source

[-]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

23.217

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

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

Unit

Source

[-]

Download this part as:

Sources

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

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

3480

Unit

Source

[1]

Unobserved

Value

309

Unit

Source

[1]

Normalized RMS of residuals

Value

0.629645

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2015-12-03.28135

Unit

Source

[2]

Last Observation

Value

2025-06-13.23131

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

91 (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

Unit

Source

[-]

Last Observation

Value

Unit

Source

[-]

Delay (Discarded)

Value

0 (0)

Unit

Source

[-]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[-]

Total Radar Observations (Discarded)

Value

0 (0)

Unit

Source

[-]

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

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 2015XR1 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	1956-11-12 08:43	< 1 min	0.0825370	0.0825366	0.0000001
EARTH	1966-06-06 03:29	< 1 min	0.0754582	0.0754563	0.0000006
EARTH	1984-07-02 10:23	< 1 min	0.1651344	0.1651323	0.0000007
EARTH	1997-11-14 18:32	< 1 min	0.0676959	0.0676950	0.0000003
EARTH	2007-06-02 22:56	< 1 min	0.1335186	0.1335169	0.0000006
EARTH	2015-11-25 16:17	< 1 min	0.1078298	0.1078293	0.0000002
EARTH	2025-06-12 08:00	< 1 s	0.0463430	0.0463428	0.0000001
EARTH	2038-10-16 23:57	< 1 min	0.1975493	0.1975478	0.0000005
MARS	2048-03-01 00:16	< 1 min	0.0482374	0.0482365	0.0000003
EARTH	2056-11-19 04:05	< 1 min	0.0438208	0.0438206	0.0000001
EARTH	2066-06-08 19:50	< 1 min	0.0529124	0.0529071	0.0000018
EARTH	2084-06-27 14:53	1.4	0.1441750	0.1441618	0.0000044
EARTH	2097-11-13 07:03	< 1 min	0.0869908	0.0869768	0.0000047
EARTH	2107-06-05 06:49	< 1 min	0.1253520	0.1253428	0.0000031
EARTH	2115-11-29 23:47	< 1 min	0.1515171	0.1515136	0.0000012
EARTH	2125-06-24 08:56	< 1 min	0.1204854	0.1204791	0.0000021

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
305.75038091	157.72510551	0.04077790	MINIMUM
51.28073373	315.99377009	0.04383553	MINIMUM
358.04195607	236.38373843	0.26366691	SADDLE
179.27275336	57.64779050	1.04292910	SADDLE
357.93591943	56.18510253	1.73795349	SADDLE
179.18703016	237.58853713	3.04424392	MAXIMUM

Download:

MOID Plots

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